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1770-6.5.19, Smart Transmitter Interface Products (HART Protocol

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1. Octal Bits 17 16 15 14 18 12 11 10 07 06 05 04 03 02 01 00 Decimal Bits 15 14 18 12 11 10 09 08 07 06 05 04 03 02 01 00 Word 00 Smart Transmitter Interface Channel Number Smart Transmitter Interface Command Word 01 Smart Transmitter Interface Status Smart Transmitter Interface Error Code Word 02 HART Address HART Delimiter Mas Bur Manufacturer Lng 0 0 0 0 Frame Type Adr Mde Identification Code Frm Word 03 Device ID Manufacturer s Most Significant Byte Device Type Word 04 Device ID Device ID Least Significant Byte Middle Byte Word 05 Byte Count HART Command Word 06 HART Response Code Second Byte First Byte Word 07 Primary Variable Primary Variable Most Significant Byte Units Word 08 Primary Variable Primary Variable 8rd Most Significant Byte 2nd Most Significant Byte Word 09 Check Byte Primary Variable Least Significant Byte Table 4 S D9 40 0110 8000 686 Example Data Offset at 09 40 Long Frame Format for HART 1 Command Address 0 1 2 3 4 000D 1115 5 6 7 8 9 0701 0000 4220 3991 B356 Long Frame Word Contents Smart Transmitter Interface to Programmable Controller Offset at D9 40 Word 00 Smart Transmitter Interface Command is hexadecimal 10 low byte Smart Transmitter Interface Channel is hexadecimal 01 high byte
2. J oL Jol of ol o gt c p JP JP JP Edd JP 0 1 Jet JP Pt 1 D EFE D EE D E aye EIS DEED EE 0 EAS 0 Eye D EIS 0 ER D ER 0 EIS D EI D EID D CH3 CH4 CH5 CH6 CH7 CH8 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 12 SH 12 SH 1 2 SH 1 2 SH 12 SH 12 SH 1 2 SH 1 2 SH 12 SH 12 SH 1 2 SH 1 2 SH oe EES O E 4 E 3 User writeable area Jumpers to select Loop Power MR T ont HART Transmitters Loop Fuses Connectors 90017 The Remote I O Port of the Communications Controller Programmable Controller Host Communications Using programmable controller ladder logic to initiate Block Transfer Writes and Reads BTW and BTR data can be sent to and received from the HART field devices A host computer on the DH network running application programs such as ControlView can read and display the data which the programmable controller has obtained from the HART field devices See Figure 1 4 1 4 Chapter 1 Introducing the Smart Transmitter Interface Figure 1 4 Smart Transmitter Interface with Programmable Controller Host Programmable HART PAPE Controller with Transmitter Field Ladder Logic Interface Devices 90032 DH Host Communica
3. f Higher Order Slave Address Bits 110000 LJ o Master Address Bit Frame Type 0 Secondary Master 010 STX Frame 1 Primary Master Reserved Long Short Frame Bit 0 Short 1 Long 90070 4 6 4 Communicating with the Smart Transmitter Interface Short Frame Address Field This one byte field contains three bit fields the master address bit the logical address bits and the slave address bits The master address bit differentiates between packets sent from a primary or secondary master Set this bit to 0 so the Smart Transmitter Interface operates in the preferred mode of primary master For those applications requiring a secondary master set this bit to 1 Since master mode changes at the Smart Transmitter Interface are dynamic for each message you can change this bit for successive messages Important A link to a HART field device can have only one primary and one secondary master Two logical address bits define the addresses of up to four logical devices within one HART field device You should clear these bits for most field devices The slave address bits range from decimal 0 to 15 Most applications with point to point HART links require a slave address of 0 However HART field devices only recognize polling addresses of 1 to 15 when placed into multi drop mode and assigned a polling address using HART Command 6 When the field device is on a point to point link set thi
4. Half Duplex DF1 Packet Formation Data Highway Plus and the Smart Transmitter Interface Troubleshooting Interpreting the Terminal Block LEDs Interpreting the Communications Controller Status LEDs Interpreting the Communications Controller Status LEDs Interpreting the Communications Controller Numeric Displays Product Specifications Communications Controller 1770 HT1 RS 232 Interface RIO Interface Terminal Block 1770 HT8 16 Interface Electrical ae eeu REX RR dees RECEN inc vv Environmental 8 Channel Terminal Block 1770 HT8 1770 HT1 Interface 4 20 mA Current Loop Interfaces see Figure Electrical 2 cata e Re ect ids urn E Environmental 16 Channel Terminal Block 1770 HT16 1770 1 Interfa a uds wed eta PED 4 20 mA Current Loop Interfaces see Figure leg m PP ia EA oe oats Environmental
5. ees 2 6 Star Linear Connection 2 1 Connector and 2 8 Setting the Board Address Jumpers 2 9 Table of Contents Marking the Terminal Block 2 11 Connecting the Terminal Blocks to I O and HART Field Devices 2 11 Connecting to 1771 I O Devices 2 12 Connecting to HART Field Devices 2 13 Connecting a Hand Held Terminal 2 16 koe ecd deal eta xo 2 18 Grounding the HART Field Device Cable Shield 2 18 Grounding the Analog I O Cable Shield 2 18 Supplying Power to the Communications Controller and Terminal Blocks 2 19 Fuses for the Communications Controller 2 19 Connecting Power to the Communications Controller 2 20 Supplying Loop Power for HART Field Devices 2 20 Power Supply Requirements 2 21 Connecting the Power Supply for Loop Power 2 21 Connecting the Communications Controller to the RIO Host 2 22 Termination 2 23 Activity 2 24 Connecting the Communications Controller to the RS 232C Host 2 24 RS 232C Baud Rates 2 24 goo
6. 1 1 1770 HT1 Communications Controller 1 1 1770 HT8 16 Terminal Block 1 3 The Remote I O Port of the Communications Controller 1 4 The RS 232C Port of the Communications Controller 4 5 The HART Protocol 1 8 The HART Protocol and the Smart Transmitter Interface 1 9 Poll Response Mode 1 10 Burst _1 10 Features of the Smart Transmitter Interface 1 10 Benefits of Using the Smart Transmitter Interface 1 11 Compatibility 1 12 Family ese 1 12 HART Field Devices 1 12 Analog VO Devices Ma Ru eu eau 1 13 Held Terminal 1 13 Installing the Smart Transmitter Interface Products 2 1 Before You 2 1 Electrostatic Damage 2 2 Overview of the Installation Procedure 2 2 Mounting Smart Transmitter Interface Products ina Cabinet 2 3 Connecting the Communications Controller to the Terminal Blocks 24 Digital Communications Cables 2 4 Linear Connection 2 5 Star Connection sacre
7. Smart Transmitter Interface Error Code Smart Transmitter Interface Status Smart Transmitter Interface Data Valid Smart Transmitter Interface Commands and Responses No Operation hexadecimal command 00 Enable Poll and Response Mode hexadecimal command 01 Enable Burst Monitor Mode hexadecimal command 02 Send Message to Device hexadecimal command 10 Read Burst Data hexadecimal command 11 Set Number of Preambles hexadecimal command 20 Set Number of Retries hexadecimal command 21 iv Table of Contents Read Status and Statistics hexadecimal command 30 Reset Statistics Counters hexadecimal command 31 Read ID hexadecimal command 32 Programmable Controller Communication with HART Field Devices Short Frame Word Contents Programmable Controller to Smart Transmitter Interface Offset atD9 00 Short Frame Word Contents Smart Transmitter Interface to Programmable Controller Offset atD9 40 Long Frame Word Contents Programmable Controller to Smart Transmitter Interface Offset at 09 10 Long Frame Word Contents Smart Transmitter Interface to Programmable Controller Offset at 09 40 Serial Communication with the Smart Transmitter Interface Full Duplex iie hesiu I np
8. 2 24 Activity 2 24 Connector and 2 24 Modem Connections 2 29 Configuring the Communications Controller 3 1 Overview of Configuration Procedures 31 Displays cece eens 3 1 Push Buttons 3 2 Configuration Step by Step 3 3 Enter Configuration Mode 3 3 Configure Basic Parameters 3 4 Configure Advanced RS 232C Parameters 3 4 Save and Exit 3 4 Exit Without Saving 3 5 Setting Factory Defaults 36 Communication Parameters 3 6 Basic 3 6 Basic 3 6 Advanced RS 232C Communication Parameters 3 8 Verifying the Communication Parameters 3 10 Marking the Communications Controller Label 3 10 Table of Contents iii Communicating with the Smart Transmitter Interface Data Routing and Protocol Conversion Data Routing In Poll and Response Mode Data Routing in Burst Monitor Protocol
9. HART FIELD DEVICE 24 v3 HT16 HART FIELD DEVICE 90054 Connecting Power to the Terminal Blocks To connect an external 24 VDC power supply to a Terminal Block do the following 1 Make sure the power supply is turned off 2 Connect the wire from the positive terminal in the power supply to pin 2 in the 17 pin connector on the cable C4 Cabling and Power Supply Requirements for Loop Power Appendix C Cable Length and Power Supply Requirements 3 Connect the wire from the negative terminal in the power supply to pin 3 in the 17 pin connector on the cable 4 Insert the connector on the cable into the 17 pin connector header on the Terminal Block 5 Turnon the power to the power supply If loop power is to be supplied to HART field devices via a Terminal Block several factors have to be accounted for in the calculation of the voltage required of the external 4 20 mA power supply These include the supply voltage required by the HART field device varies from device to device the wire gauge and length of the 4 20 mA loop the DC resistance of the Terminal Block in relation to the 4 20 mA current loop the voltage drop across one of the Terminal Block s diodes These factors have been incorporated in the following formula Vsupply Vdevice 2 X i X 1 X 514 25 X i 025 where l is the cable length in feet 1 is the maxim
10. Data Link Layer Packet DLE STX DST SRC APPLICATION DATA DLE ETX BCC CRC Since message is from host to Smart Transmitter Interface DLE data link escape control character 10 hex STX start of text control character 02 hex DST host station address in hexadecimal SRC Smart Transmitter Interface station address in hexadecimal CMD 4F hexadecimal STS status byte TNS transaction number 2 bytes LEN length of Smart Transmitter Interface Packet in bytes SCMD Smart Transmitter Interface Command CHN Smart Transmitter Interface Channel ERR Smart Transmitter Interface Error Code STA Smart Transmitter Interface Status ETX end of text control character 03 hex BCC CRC Block Check or CRC bytes 90080 4 39 4 Communicating with the Smart Transmitter Interface Figure 4 18 DF1 Response Enable Poll and Response Mode DLE STX DST SRC STS TNS LEN Smart Transmitter Interface DLE ETX BCC Packet sp eee qe spe qe poorer or Command OF with FNC 95 and command 06 as described in Appendix B are the only commands supported by the Smart Transmitter Interface Consult the Data Highway Data Highway Plus DH 485 Protocol and Command Set Manual for the additional information required to successfully implement both full and half duplex communications with the Smart Transmitter Interface Data Highway Plus and the The Smart Trans
11. 3 Insert the plug into the power connection header on the upper right corner of the Terminal Block Figure 2 19 2 21 Chapter 2 Installing the Smart Transmitter Interface Products Connecting the Communications Controller to the RIO Host 2 22 4 Turn the power supply on Important The loop power and ground common wires are only needed if the HART field devices connected to the Terminal Blocks draw power from the 4 20 mA current loop instead of from their own individual power supplies The earth ground wire is needed whether or not loop power is being supplied Figure 2 19 Connecting an External Power Supply to a Terminal Block for Loop Power to HART Field Devices LOOP POWER EARTH COMMON GROUND EE H C Loop Power O O Terminal Block 90028 The RIO connector is a 3 position Phoenix COMBICON connector located at the left end of the unit just to the right of the DB 25 connector at the top edge of the board see Figure 2 20 Attach the matching plug supplied with the Communications Controller to the RIO cable Insert the plug into the connector to make the RIO connection Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 20 RIO Connector Twinaxial Cable 1770 CD Shield Blue ees Clear POWER es The pino
12. 10 position COMBICON connector on Terminal Block 1 2 3 4 5 6 7 8 RIN SH 90045 Supplying Power to the The Communications Controller requires an external 24 VDC power Communications Controller supply with 1 voltage regulation The power supply must provide the and Terminal Blocks Communications Controller with 200 mA of current It must also provide an additional 100 mA of current for each Terminal Block that is connected to the Communications Controller For example the setup in Figure 2 3 requires a 24 VDC power supply that can provide at least 500 mA Please refer to Appendix C if your cable length requirement exceeds those shown in Figure 2 3 to Figure 2 5 For recommended power supplies see Appendix C Table C A Fuses for the Communications Controller Overload protection for external power is provided by a 1 Amp user replaceable fuse located immediately below the power connector on the Communications Controller The fuse is UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 250V fast acting 2 19 Chapter 2 Installing the Smart Transmitter Interface Products Supplying Loop Power for HART Field Devices 2 20 Connecting Power to the Communications Controller To connect the power supply to the Communications Controller 1 the power supply off 2 Attach the 3 position Phoenix COMBICON plug supplied to the output cable of the power supp
13. HART Communications Specifications Table of Contents DF1 Diagnostic Command Support Diagnostic Command 5 Diagnostic Diagnostic Head Diagnostic Status Diagnostic Counter Reset Cable Length and Power Supply Requirements Cabling Requirements Between the Communications Controller andthe Terminal Blocks Maximum Power Cable Lengths Using a Separate Power Supply for a Terminal Block Connecting Power to the Terminal Blocks Cabling and Power Supply Requirements for Loop Power les um CEE In eeke E e N Purpose of the Manual Organization of the Manual How to Use This Manual Preface Preface This manual shows you how to use the Smart Transmitter Interface products with Allen Bradley programmable controllers and other intelligent host computers It describes how to install and configure the Smart Transmitter Interface products as well as how to perform trouble shooting procedures This manual contains five chapters and three appendices They address the following topics Chapter Topics Covered Chapter 1 Introducing the Smart Transmitter
14. 01 Enable Poll and Puts the Smart Transmitter Interface into Poll and Response Response Mode mode 02 Enable Burst Puts the Smart Transmitter Interface into Burst Monitor mode Monitor Mode where it begins monitoring all channels listed in the Smart Transmitter Interface Data portion of the message for bursting HART data 10 Send Messageto Directs the Smart Transmitter Interface to forward the Device message to the channel specified in the Smart Transmitter Interface Channel byte 11 Read Burst Data Directs the Smart Transmitter Interface to respond with the latest data stored in the Burst Data Table for the channel specified in the Smart Transmitter Interface Channel byte 20 Set Number of Sets the number of preamble bytes used for the channel Preambles specified in the Smart Transmitter Interface Channel byte 21 Set Number of Sets the number of retries before declaring No Response on Retries the channel specified in the Smart Transmitter Interface Channel byte 30 Read Status and Directs the Smart Transmitter Interface to return a set of Statistics statistics for the channel specified in the Smart Transmitter Interface Channel byte 31 Reset Statistics Directs the Smart Transmitter Interface to reset all the Counters statistics counters to 0 32 Read ID Directs the Smart Transmitter Interface to return the series and revision information Smart Transmitter Interface Control The third byte of the header provides contr
15. None once you initiate active communications green on the RS 232C link this LED flashes to reflect communication activity OFF No communication Check the RS 232C parameters Table 3 B parameters 4 8 Table 3 C and the cable connections and pinouts HART FLASHING Normal operation None the Communications Controller is green receiving information from the HART field devices OFF No communication Replace HART field device if faulty Verify wiring from Communication Controller to Terminal Blocks and from Terminal Blocks to HART field device Ensure power is being supplied to the HART field device Ensure LOOP POWER jumper on the Terminal Block Jpn is correctly set Ensure Terminal Block Board Address jumpers are correctly set FAULT ON A fault has been See Table 5 C red detected OFF Normal operation None Important The RS 232 and HART LED indicators always stay off if there is no communication activity on the communication channel Interpreting the Communications Controller Numeric Displays Chapter 5 Troubleshooting The numeric displays are used to indicate hardware fault conditions When the fault indicator is lit the left display will show a number indicating the type of hardware fault Table 5 C gives a description of the faults Table 5 C Hardware Faults This number Indicates this fault Meaning Processor Fault A hardware fault was detected in the processor This i
16. Since the Smart Transmitter Interface calculates this byte you can set this field to a null 00 Field devices transmit HART Response packets or HART Burst Data packets to the Smart Transmitter Interface using the format illustrated in Figure 4 6 and Figure 4 7 The Smart Transmitter Interface removes the preamble bytes and sends the remaining fields to the host processor With a programmable controller use BTRs to accomplish With a computer use DF1 Responses to receive data from the Smart Transmitter Interface Preamble frames transmitted by field devices are preceded by a number of hexadecimal FF bytes which are called the preamble to the frame As the Smart Transmitter Interface handles all preamble bytes the host processor does not receive them HART Delimiter This one byte field encodes the HART frame as either an ACK or Burst frame An ACK frame indicates a response packet while a Burst frame indicates a burst packet from a field device One bit of this field specifies whether a short frame or long frame address follows this byte In poll and response mode you will receive hexadecimal 06 for a short frame address or hexadecimal 86 for a long frame address In burst mode when the host processor is receiving data from the Smart Transmitter Interface s Burst Data table this field will contain hexadecimal 01 for a short frame address or hexadecimal 81 for a long frame address 4 9 4 Communicating with t
17. between 1 and 63 Zero is reserved for hosts on the Data Highway Plus which use the pass through functionality of the programmable controller This program assumes that the Smart Transmitter Interface is configured for rack 1 group 2 and the HART field device is connected to channel 2 of the Terminal Block HART command 0 is first sent to a field device to obtain its long frame address Then the program continually sends HART command 1 to the field device and obtains its response If the Smart Transmitter Interface returns a non zero error code in the Smart Transmitter Interface Error Code the PLC 5 program sends HART command 0 and repeats the above cycle You can also force the programmable controller to resend HART command 0 by clearing bit B3 0 The rungs in Figure 4 10 perform the following functions Rung 0 Sets up the BTW data for a short frame HART command 0 and clears B3 0 to indicate that the long frame address must be initialized Rung 1 Performs the BTW if no previous BTW or BTR is active Rung 2 Performs the BTR if no previous BTW or BTR is active and if the BTW is completed Rung 3 Moves the Smart Transmitter Interface Error Code received from the Smart Transmitter Interface to D9 30 and sets B3 3 to indicate that the data received in the BTR is valid 4 27 4 Communicating with the Smart Transmitter Interface Rung 4 Sets B3 1 if a non zero error code was received from
18. 90056 2 15 Chapter 2 Installing the Smart Transmitter Interface Products 2 16 Connecting a Hand Held Terminal Because the HART protocol supports up to two digital communication masters at one time you can use a hand held terminal to communicate with the HART field devices without disrupting their connection to the Terminal Blocks To do this attach the clips of your hand held terminal to either end of the resistor on the Terminal Block that corresponds to the channel to which you wish to connect See Figure 2 14 igure 2 15 and Figure 2 16 show the channels and their corresponding resistors Figure 2 14 Connecting the Hand Held Terminal Hand Held Terminal 90063 Se pump pp ppp ppm pem G ES E EUG GEGEGSSSsscgegs E 3 E TER 8 CHANNEL TERMINAL BLOCK uy CATALOG NO vorrs z vac Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 15 HT8 Terminal Block Channels and Corresponding Resistors HT1 HT8 HT16 INTERCONNECT 8 CHANNEL wy TERMINAL BLOCK vours z voc Pi FN ERIS 0 EEZIS D Eye D EFI 0 EIS D Eo 0 EIS D CH1 CH2 CH3
19. BOARD ON Normal operation None will light up when any channel on the SELECTED board is being addressed by the green Communications Controller default address on powerup is logical address 1 OFF Not selected None Depends upon a loop power supply being connected to the Terminal Block If communicating but the light is off check the wiring between the Communications Controller and the Terminal Block 5 1 5 Troubleshooting Interpreting the There are five status LEDs on the front panel of the Communications Communications Controller Controller These indicators can help you diagnose problems with the Status LEDs module s installation and operation Table 5 B Communications Controller LED Indicators LED State Probable Cause Recommended Action POWER ON Normal operation None green OFF No power Replace fuse if blown Ensure wiring to power connector is correct FLASHING Intermittent contact Inspect power connector wiring for loose wire RIO ON Normal operation None green OFF Remote fault Ensure wiring to remote connector is correct Verify RIO communication parameter settings See Chapter 3 FLASHING Not transmitting Verify RIO communication parameter settings data Ensure only the last logical module in the rack has its Last Module parameter set to Yes Ensure that programmable controller is in RUN mode RS 232 FLASHING Normal operation
20. Products Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside the Smart Transmitter Interface products To guard against electrostatic damage observe the following precautions wear an approved wrist strap grounding device or touch a grounded object to rid yourself of electrostatic charge before handling the products keep the products in their static shield bags when not in use Overview of the Installation The general procedure for installing the Smart Transmitter Interface Procedure products is as follows 1 Mount the Communications Controller and the Terminal Blocks in their appropriate equipment cabinet or cabinets 2 Connect the Communications Controller to the Terminal Blocks and set the board address jumpers on the Terminal Blocks 3 Connect the Terminal Blocks to I O modules 1771 I O devices and HART field devices 4 Establish the necessary ground connections 5 Connect the Communications Controller and Terminal Blocks to a power supply 6 Configure the communications parameters on the Communications Controller as detailed in Chapter 3 7 Connect the Communications Controller to the host through the RIO or RS 232C port 2 2 Mounting Smart Transmitter Interface Products in a Cabinet Chapter 2 Installing the Smart Transmitter Interface Products Mount the Terminal Blocks in the same equipment cabinet as the Analog I O modules to which they will be con
21. Word 00 Smart Transmitter Interface Command is hexadecimal 10 low byte Smart Transmitter Interface Channel is hexadecimal 01 high byte 4 31 4 Communicating with the Smart Transmitter Interface 4 32 Word 01 Smart Transmitter Interface Control is hexadecimal 00 indicating a response is required from the Smart Transmitter Interface low byte Smart Transmitter Interface Parameter is hexadecimal 00 high byte Word 02 HART delimiter is hexadecimal 82 indicating an STX frame with a long frame address low byte HART long frame address is hexadecimal A6 indicating primary master and a manufacturer s identification code of hexadecimal 26 for Rosemount high byte Word 03 Manufacturer s device type code is hexadecimal OD for a 3044C temperature transmitter low byte most significant byte of 24 bit device identification number is hexadecimal 00 high byte Word 04 middle byte of 24 bit device identification number is hexadecimal 15 low byte least significant byte is hexadecimal 11 high byte Word 05 HART command is hexadecimal 01 low byte HART packet byte count is hexadecimal 00 high byte Word 06 HART packet check byte set to 0 low byte zero padding high byte Table 4 R 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface to Programmable Controller BTR Data Long Frame Format for Response to HART Command 1
22. Word 01 Smart Transmitter Interface Error Code is hexadecimal 00 indicating no errors low byte Smart Transmitter Interface Status is hexadecimal 80 indicating the Smart Transmitter Interface has been reset high byte 4 33 4 Communicating with the Smart Transmitter Interface Word 02 HART delimiter is hexadecimal 86 indicating ACK frame with a long frame address low byte HART long frame address is hexadecimal A6 indicating primary master burst mode disabled and the manufacturer s identification code of hexadecimal 26 for Rosemount high byte Word 03 manufacturer s device type code is hexadecimal OD for a 3044C temperature transmitter low byte most significant byte of 24 bit device identification number is hexadecimal 00 high byte a Word 04 middle byte of 24 bit device identification number is hexadecimal 15 low byte least significant byte is hexadecimal 11 high byte Word 05 HART command is hexadecimal 01 low byte HART packet byte count is hexadecimal 07 indicating 7 bytes of data between this byte count and the check byte high byte Word 06 first byte of HART response code is hexadecimal 00 indicating no communications errors low byte second byte of HART response code is hexadecimal 00 indicating no device errors Word 07 primary variable units are hexadecimal 20 for degrees Celsius low byte most significant byte of IEEE 754 primary variable is hexadec
23. as the 1771 IFE The Analog I O module decodes the analog data and passes it along to the programmable controller At the same time the Terminal Block reads the digital portion of the signal and multiplexes it to the Communications Controller The Communications Controller embeds the digital data into messages conforming to the RIO or DF1 protocol format and passes it to the appropriate host processor and its application program in one of three ways toa programmable controller via the remote I O link toacomputer via the RS 232C port toahost on the Data Highway Plus network via the pass through feature of an Allen Bradley PLC 5 family programmable controller Important You cannot have more than one DH host computer using the pass through feature or more than one RS 232C host Chapter 1 Introducing the Smart Transmitter Interface Features of the Smart Transmitter Interface 1 10 Poll Response Mode The HART protocol supports two modes of digital communications poll response and burst In poll response mode the host processor requests information from polls the smart device Both point to point and multidrop networks can employ this mode When the host processor sends a request or control information to the HART field devices the Smart Transmitter Interface reads the routing information in the header portion of the data It then strips the header off the message and sends the data down the appropriate channel to
24. differential transmit enable differential half duplex HART transmit receive A 3 Appendix Product Specifications 4 20 mA Current Loop Interfaces see Figure A 1 Channels I O Module Connector I O Module Cable Length Field Device Connector Loop Fuses Electrical DC Input Voltage DC Current Fuse Connector Power Consumption sixteen 4 20 mA current loops Phoenix COMBICON header and plug 10 position 2 sets 12 24 AWG 30 foot 9 m maximum between the Terminal Block and the Analog I O module Phoenix COMBICON header and plug 12 position 4 sets 12 24 AWG UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 0 1 Amp 250V fast acting 24 32 VDC for 4 20 mA current loops if required Maximum of 0 4A or as required for all 4 20 mA current loops connected UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 0 5 Amp 250V fast acting Phoenix COMBICON header and plug 3 position 12 24 AWG 9 6 watts maximum or as required for all 4 20 mA current loops connected Physical Dimensions 4 3 10 9 cm wide x 15 5 39 cm long x 2 7 6 9 cm high Weight 1 8 Ib 0 8 kg approximate Mounting DIN rail EN 50 022 or EN 50 035 Environmental Operating temperature Storage temperature Operating humidity A 4 0 C to 60 C 32 F to 140 F 40 C to 60 C 40 F to 140 F 5 to 95 non condensing HART Communications Specifications Appendix A Product Specifications The communication
25. the connector at the Communications Controller will have one set of 17 wires leading out of it The connector at each Terminal Block except the last one will have two sets of wires in the same holes the one coming from the previous connection either the Communications Controller or the previous Terminal Block and the one leading to the next Terminal Block Chapter 2 Installing the Smart Transmitter Interface Products Star Connection For star connection the cables to each Terminal Block lead to the connector on the Communications Controller directly If you are using a star arrangement the connector at the Communications Controller will have as many sets of wires leading into it as there are Terminal Blocks The connector at each Terminal Block will have only one set of wires leading directly back to the Communications Controller Figure 2 4 Example 2 Star Connection 1770 HT8 90030 Example 2 assumes that the modules HT1 and four HT8 s are installed in separate cabinets The table below gives one example of possible cable lengths Cable Size Cable b Cable c Cable d Belden 485168 250 ft 250 ft 250 ft 250 ft Chapter 2 Installing the Smart Transmitter Interface Products Star Linear Connection Example 3 shows a setup where a combination of star and linear connections are used In this example two HT8 s are joined in a linear connection by cable a
26. to a single twisted pair wire and can operate over leased telephone lines Chapter 1 Introducing the Smart Transmitter Interface The HART Protocol and the Smart Transmitter Interface Each Communications Controller can communicate with a maximum of 32 channels via the 1770 HT8 and 1770 HT16 Terminal Blocks As all channels are multiplexed communications can only occur over one channel at a time Each channel can have one HART field device connected to it in point to point mode or up to 15 devices in a multidrop network The host addresses these channels using channel numbers 0 31 decimal The Communications Controller in the Smart Transmitter Interface receives HART protocol commands from the host processor via Remote T O or RS 232C connection and routes these commands via the Terminal Blocks to the HART field devices The Smart Transmitter Interface receives responses from the HART field devices and transmits the responses to the host when it polls for them In both multidrop and point to point networks each device has a unique address that is included in every HART message A device picks up messages destined to it via this unique address When the Terminal Block receives the composite digital analog signal from the HART field devices it filters out the digital portion of the signal see Appendix A for more information on the filtering circuitry and passes the analog portion on to an Allen Bradley Analog I O module such
27. 09 20 Length 5 B3 U Rung 1 7 0 7 5 BTW 0 1 1 WI BLOCK TRANSFER WRITE EN 15 45 Rack 01 Group 2 DN Module 0 Control Block N7 0 ER Data File D9 20 Length 7 Continuous N Rung 2 N7 0 N7 0 N7 5 jr BIR lI yl y BLOCK TRANSFER READ EN 13 45 15 Rack 01 Group 2 DN Module 0 Control Block N7 5 ER Data File D9 40 Length 12 Rung 3 Continuous N N7 5 B3 _ 4 1 ONS MASKED MOVE 13 4 SOURCE D9 41 MASK 00 DEST D9 30 B3 Rung 4 0 ung 3 B3 4 B3 I NOT EQUAL 3 Source A D9 30 1 Source B 0 B3 B3 B3 U ONS 6 6 5 Rung 5 B3 B3 EQU _ 09 44 p 4 1 I EQUAL I MASKED MOVE 0 3 Source A D9 30 7 Source D9 45 Mask 0 lii Dest D9 12 pr 4 MASKED MOVE Source D9 46 Mask OOFF Dest D9 13 MM 4 MASKED MOVE Source D9 49 Mask FF00 Dest D9 13 MOV 4 MOVE 1 Source D9 50 Dest D9 14 p 4 COPY FILE Source 09 10 Dest D9 20 Length 7 B3 L 0 90077 4 26 4 Communicating with the Smart Transmitter Interface Table 4 K PLC 5 Data Tables for Example Program Address 15 Data B3 0 0000 0000 0000 0000 Address 9 D9 00 0000 D9 10 0000 D9 20 0000 D9 30 0000 D9 40 0000 ATTENTION The BTR command must have a data file length
28. 20 to the Terminal Blocks _C 4 separate power supply to the Terminal Blocks C 4 J Jumper blocks 2 20 Jumper positions for DSR and CTS lines 25 pin 2 27 9 2 27 L LEDs interpreting Communications Controller 5 2 Terminal Block 5 1 Loop power selection A 6 Maximum cable length from the RS 232C port to a host 2 24 power cable C 3 Menus main 3 1 3 7 sub 3 1 3 9 Modem 2 25 cabling considerations 2 28 connections 2 29 Modes of operation 3 1 Multidrop connection 2 14 Numeric displays interpreting 5 3 malfunction 5 1 P Parameter number 3 6 Physical specifications Communications Controller A 2 Terminal Block HT16 4 Terminal Block HT8 _ 3 Point to point connection 2 14 Poll and Response mode 4 2 4 20 Power supplies recommended _ 6 Preamble 4 5 4 9 R Receive Data 2 25 Remote 1 0 port communications via the 14 Reply Diagnostic Counter Reset format B 3 Diagnostic Loop format B 1 Diagnostic Read format B 2 Diagnostic Status format B 3 Requestto Send 2 25 Reset to defaults 3 3 Response code 4 12 Retries 3 9 RIO parameters 3 6 3 7 Index 1 3 RS 232 Activity LED 3 10 RS 232C communications via _1 5 connector pinouts 2 25 parameters 3 6 3 7 Run mode 3 1 3 8 S Save in configuration mode 3 3 successful 3 5 Save and Exit 3 4 Serial communication 4 34 Series and revision numbers 3 7 Si
29. 26 Figure 2 21 Three Wire Connection to IBM Computer 25 pin Female 25 pin connector to Communications Controller Female 25 pin connector to Computer 1 Shield TXD 2 3RXD RXD 3 lt 2 TXD GND 7 7 GND 0005 Figure 2 22 Three Wire Connection to Computer 9 pin Female 25 pin connector to Communications Controller Female 9 pin connector to Computer 1 Shield TXD 2 2RXD RXD 3 lt 3 TXD GND 7 5 GND 90006 Chapter 2 Installing the Smart Transmitter Interface Products If your computer requires active DSR and CTS signals add jumpers to the computer connections as shown in Figure 2 23 and Figure 2 24 Figure 2 23 Jumper Positions for DSR and CTS Lines 25 pin Communications Controller Computer 1 Shield TXD2 3 RXD RXD3 lt 2TXD GND 7 7 GND 4 RTS 5CTS 6DSR 8DCD 20 DTR 90007 Figure 2 24 Jumper Positions for DSR and CTS Lines 9 pin Communications Controller Computer 1 Shield TXD2 2 RXD RXD3 lt 3 TXD GND 7 5 GND gt 7 RTS U gt 8 CTS gt 6 DSR gt 1DCD gt 4 DTR 90008 2 27 Chapter 2 Installing the Smart Transmitter Interface Products If you are using handshake signals with your computer use the connection shown in Figure 2 25 or Figure 2 26 Figure 2 25 Connection to IBM Computer with Handshake Signals 25 pin
30. Control 7 8 9 Control White and Black twisted pair White is Black is Channel Select 3 10 Control Channel Select 3 11 Control Orange and Black twisted pair Orange is Black is Channel Select 4 12 Control Channel Select 4 13 Control Brown and Black twisted pair Brown is Black is Channel Select 5 14 Control Channel Select 5 15 Control Green and Black twisted pair Green is Black is HART Tx Rx 16 Control HART Tx Rx 17 Control Yellow and Black twisted pair Yellow is Black is Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 6 Attaching Plugs to the Digital Communications Cable P shield 1770 HT1 1770 HT8 17 N C no connection 17 Setting the Board Address The Communications Controller can handle up to 32 HART channels via Jumpers the Terminal Blocks However since the 32 channels can be divided among as many as four separate terminal blocks the Communications Controller needs to know where one Terminal Block ends and the next begins That is it needs to know which of the 32 channels belong to which individual Terminal Block and whether it 1s an 8 or a 16 channel block Each Terminal Block has a set of board address jumpers located just to the right of the black cover near the top edge of the board see Figure 1 2 and Figure 1 3 To set a ju
31. Controller connect a wire from the Earth Ground terminal of its 3 position COMBICON power connector see Figure 2 18 to the local ground bus Ground each Terminal Block in the same way and insert the plug in the power connection header for loop power see Figure 2 19 Each Terminal Block must be grounded in this way regardless of whether or not it is to provide 4 20 mA loop power for HART field devices Grounding the HART Field Device Cable Shield Connectors to the HART field devices on the Terminal Blocks are internally grounded to the power connector Once the power connector is properly grounded these connectors are also properly grounded Grounding the Analog I O Cable Shield Important The shield connection in the cable between the Terminal Blocks and the Analog I O modules must be grounded at one end only The cable must not be more than 30 feet long If the Analog I O module is a 1771 IFE module ground the shield connection to the chassis of the 1771 IFE as shown in the documentation for that module Do not ground the shield to the Terminal Block connector If the Analog I O module is of another kind and grounding at that end is not feasible you must first connect the cable s shield wire to the position on the Terminal Block plug marked SH for Shield see Figure 2 17 Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 17 Grounding Analog 1 0 To Analog I O 10 position COMBICON plug
32. Interface overview of the Smart Transmitter Interface introduction to the HART protocol and features and benefits of using them Chapter 2 Installing the Smart Transmitter Interface installation procedure power supply requirements and connection instructions Chapter 3 Configuring the Communications Controller the communication parameters and how to set them on the Communications Controller Chapter 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface data routing and protocol conversion communication terms HART and Smart Transmitter Interface data packets PLC 5 programming example and serial host communication with the Smart Transmitter Interface Chapter 5 Troubleshooting diagnosing communications problems Appendix A Product Specifications technical specifications for 1770 HT1 HT8 and HT16 and HART communications specifications Appendix B DF1 Diagnostic Command Support diagnostic commands for use on the RS 232C link between a host processor and the Communications Controller Appendix C Cable Length and Power Supply Requirements cable length requirements between the Communications Controller and the Terminal Blocks and power supply requirements This manual explains the features functions and specifications of three products designed to provide communication between Allen Bradley products and HART field devices These products are Co
33. as transmitted from a host computer Here the DF1 packet contains the Smart Transmitter Interface packet which in turn contains the HART packet The Smart Transmitter Interface converts all received packets to the required format before transmitting them to their destination As mentioned previously when sending a packet to a HART field device it adds preamble bytes When sending a packet to the host processor the Smart Transmitter Interface attaches a four byte header The contents of these bytes are explained in the sections describing the various packets 4 3 4 Communicating with the Smart Transmitter Interface Definition of Terms 4 4 Table 4 A summarizes the definitions of relevant communications terms used with the Smart Transmitter Interface Table 4 A Definitions of Communications Terms Term Block Transfer Read BTR Block Transfer Write BTW Burst Data Table DF1 Protocol DF1 Packet DF1 Command DF1 Response HART Protocol HART Packet HART Poll HART Response HART Burst Data Smart Transmitter Interface Protocol Smart Transmitter Interface Packet Frame Definition A programmable controller ladder logic instruction to obtain data formatted as Smart Transmitter Interface packets from the Smart Transmitter Interface over the RIO link A programmable controller ladder logic instruction to send data formatted as Smart Transmitter Interface packets t
34. between a Communications Controller and a Modem Other than a Dial up Modem Communications Controller MODEM 1 Shield TXD2 2RXD RXD3 lt 3 TXD RTS 4 gt 4RTS 55 a 5 CTS DSR6 6 DSR GND 7 7 GND Jumper DCD8 lt 8 DCD 20 20 90030 Overview of Configuration Procedures Configuring the Communications Controller This chapter explains the communication parameters of the Communications Controller and describes how to set them System integrators need this information to configure the Communications Controller for the host system The Communications Controller has two modes of operation run mode and configuration mode During normal operation the Controller functions in run mode When the Controller is in configuration mode you can change the communication parameters using the push buttons and displays located at its left end Any changes you make to the parameter settings do not take effect until they are saved which returns the Communications Controller to run mode While in configuration mode the Communications Controller continues to communicate over its ports according to its previous settings Important Verify all parameter settings before connecting the Communications Controller to your network Incorrect settings may cause unreliable and unpredictable operation of the network Parameter settings are saved in non volatile memory so that you do
35. data output from the Communications Controller Receive Data RXD Input 3 RS 232C serialized data input to the Communications Controller Request to Send RTS 0 Output 4 A request from the Communications Controller to the modem to prepare to transmit With full duplex protocol RTS is always asserted With half duplex protocol it is turned on when the Communications Controller has permission to transmit otherwise it is off Clear to Send CTS Input 5 A signal from the modem to the Communications Controller that indicates the carrier is stable and the modem is ready to transmit The Communications Controller will not transmit until CTS is on If CTS is turned off during transmission the Communications Controller will stop transmitting until CTS is restored Data Set Ready DSR Input 6 A signal from the modem to the Communications Controller that indicates the phone is off hook It is the modem s answer to DTR The Communications Controller will not transmit or receive unless DSR is on If the modem does not control DSR properly DSR must be jumpered to a high signal at the Communications Controller It can be jumpered to DTR Signal Ground GND N A 7 Signal ground a reference point for the data signals Data Carrier DCD Input 8 A signal from the modem to the Communications Controller to indicate Detect that the carrier from another modem is being sensed on the phone line It will not be asserted unless
36. marking if you change the configuration As shown in Figure 1 10 a Terminal Block can be connected to Analog I O devices such as the 1771 IFE module and to HART field devices In addition a hand held terminal can be connected to the Terminal Block for communication with HART field devices 2 11 Chapter 2 Installing the Smart Transmitter Interface Products To Analog I O Connecting to 1771 I O Devices Attach the wires from the 1771 Analog I O devices to the 10 position Phoenix COMBICON plugs supplied with the Terminal Block Insert the plug s into the 10 position Phoenix COMBICON connectors on the upper edge of the Terminal Block see Figure 2 10 The 1771 HT8 has one connector the 1771 HT16 has two Figure 2 11 shows a 1771 IFE connected to a Terminal Block The cable between them must be no longer than 30 feet Single ended Analog I O devices are recommended Figure 2 10 Connecting the Terminal Block to an Analog I O Module 10 position COMBICON plug 10 position COMBICON connector on Terminal Block 9 2 12 12 3 4 5 6 7 8 RIN SH 12 3 4 5 6 7 8 RIN SH 90023 Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 11 1771 IFE Co
37. programming They can be in effect remote diagnostic tools as well as remote repair units Maintenance becomes simpler and less costly since you no longer need to send technicians out to the field to perform these tasks manually add Smart device capabilities to existing analog systems while maintaining existing devices You can add the Smart Transmitter Interface to an existing 4 20 mA system without having to change the wiring thus reducing installation time and expense Digital capabilities can be gradually implemented including digital process variables monitoring without modifying field devices 1 11 Chapter 1 Introducing the Smart Transmitter Interface perform configuration and diagnostics of HART field devices using third party software and the pass through feature Compatibility The Smart Transmitter Interface Products create a communication interface between programmable controllers and HART field devices See Figure 1 10 The Smart Transmitter Interface is compatible with HART field devices and with hand held terminals capable of supporting the physical and data link layers of the HART protocol Host computers can be any 100 PC compatible computers The following products have been tested in connection with the Smart Transmitter Interface PLC 5 Family PLC 5 11 PLC 5 15 PLC 5 20 PLC 5 25 PLC 5 30 a PLC 5 40 PLC 5 60 PLC 5 250 You can connect one or more Smart Transmitter In
38. recovered by writing the factory default configuration to the EEPROM You must power the module off and back on and then reconfigure it This is not a major fault but if the problem persists return the Communications Controller for servicing Power Failure The power supply voltage is below the minimum rating for the Communications Controller The Communications Controller will continue to communicate when this fault is detected but configuration will not be possible Remote 1 0 Fault A hardware fault was detected in the Remote I O Interface This is a major fault Return the Communications Controller for servicing 5 3 Communications Controller 1770 HT1 RS 232 Interface Start Bits Data Bits Parity Stop Bits Baud Rates Connector Output Protocol RIO Interface Baud Rates Rack Size Connector Cable Cable Length Output Termination Protocol Channels Connector Cable Output Protocol Product Specifications 1 8 None Even Odd 1 300 600 1200 2400 4800 9600 19200 DB 25P male RS 232C Allen Bradley DF1 57600 115200 230400 1 4 rack Phoenix COMBICON header and plug 3 position Standard blue hose shielded twisted pair cable Belden 9463 10 000 ft 3 048 m 57 6 kbaud 5 000 ft 1 524 m 115 2 kbaud 2500 ft 762 m 230 4 kbaud Allen Bradley RIO 150 or 82 ohm resistors on last nodes of RIO link depending on ba
39. the world s leading technology companies A With major offices worldwide 7 Algeria e Argentina e Australia e Austria e Bahrain e Belgium e Brazil e Bulgaria e Canada e Chile e China PRC Colombia Costa Rica Croatia e Cyprus e Czech Republic e Denmark e Ecuador Egypt El Salvador e Finland e France e Germany e Greece e Guatemala e Honduras Hong Kong Hungary e Iceland e India e Indonesia e Israel e Italy e Jamaica e Japan e Jordan e Korea e Kuwait e Lebanon e Malaysia e Mexico New Zealand Norway e Oman e Pakistan Peru e Philippines e Poland Portugal e Puerto Rico Qatar e Romania e Russia CIS e Saudi Arabia Singapore e Slovakia e Slovenia e South Africa Republic e Spain e Switzerland e Taiwan e Thailand The Netherlands Turkey United Arab Emirates e United Kingdom e United States e Uruguay Venezuela e Yugoslavia World Headquarters Allen Bradley 1201 South Second Street Milwaukee WI 53204 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Publication 1770 6 5 19 July 1993 PN 95586701 Copyright 1993 Allen Bradley Company and Dynapro Systems Inc Printed in Canada
40. the HART device Responses from the HART devices are returned to the host processor when the host polls for them If there are no more messages to be forwarded the Smart Transmitter Interface stays on the last used channel and watches the traffic This allows higher throughput if consecutive messages are sent to the same channel Burst Mode In burst mode the HART field device continuously transmits digital data to the Communications Controller in burst monitor mode without the need for request messages from the host This mode cannot be used with multidrop networks In burst monitor mode the host processor sends the Smart Transmitter Interface a list of all the channels whose devices are preset to burst mode If the list changes the host must provide a new list The Smart Transmitter Interface continuously monitors the channels on the list in order returning to the first as soon as the last has been checked The data collected from the burst channels is stored in a Burst Data table The latest information on any channel is sent to the host processor upon request While in burst monitor mode the Smart Transmitter Interface still responds to requests from the host to poll any channel When the polling is complete it resumes monitoring the burst channels The Smart Transmitter Interface 1770 HT1 and 1770 HT8 16 features include remote I O port for interface to programmable controllers RIO scanners and DH hosts RS 232C
41. the Smart Transmitter Interface Belden 9508 24 gauge or 85168 cable 20 gauge or equivalent is recommended Line 1 is shield line 2 power and lines 3 to 17 are control The connections between the Communications Controller and the Terminal Blocks can be either a linear or star topography You can use any combination of linear star connections as long as you adhere to the cabling length requirements If your particular setup requires cable lengths greater than the ones indicated in Figure 2 3 to Figure 2 5 or is substantially different refer to Appendix C Chapter 2 Installing the Smart Transmitter Interface Products Linear Connection For linear connection the cables go from the 17 pin connector on the Communications Controller to the connector on the first Terminal Block Another cable of the same kind leads from the connector on the first Terminal Block to the connector on the second Terminal Block from there to the connector on the third Terminal Block and so on Figure 2 3 Example 1 Linear Connection 1770 HT1 LNs 1770 HT8 90031 Example 1 assumes that the modules HT16 and two HT8 s are installed in separate cabinets The maximum cable lengths allowed for the setup shown in this example are given in the table below Cable Size Cable a Cable b Cable c Belden 85168 250 ft 250 ft 250 ft If you are using a linear arrangement
42. the Smart Transmitter Interface This forces rung 0 to be true on the next scan so that HART command 0 will be sent to the field device A check is also made on B3 6 which you can set if you wish to restart the cycle by sending HART command 0 to the field device Rung 5 Checks that all data is valid and if so sets up the HART command 1 using the response to HART command 0 to determine the long frame address Bit B3 0 is also set to indicate that the long frame address is initialized Table 4 L and Table 4 M illustrate BTW data for HART command 0 while Table 4 N and Table 4 O show the response received as BTR data Table 4 P through Table 4 5 illustrate the data for HART command 1 Table 4 L Programmable Controller to Smart Transmitter Interface BTW Data Short Frame Format for HART Command 0 Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Decimal Bits 15 14 18 12 11 10 09 08 07 06 05 04 03 02 01 00 Word 00 Smart Transmitter Interface Channel Number Smart Transmitter Interface Command Word 01 Smart Transmitter Interface Parameter Smart Transmitter Interface Control Word 02 HART Address HART Delimiter Mas 0 Logical Slave Address Lng 0 0 0 0 Frame Type Adr Address Frm Word 03 Byte Count HART Command Word 04 0 0 0 0 0 0 0 0 Check Byte Table 4 M 4 28 Example BTW Data Off
43. the host determines which port is used Use the Remote I O port labelled RIO in Figure 1 1 with the following a programmable controller as host processor using ladder logic to perform block transfer reads and writes On the DH network the programmable controller can connect to a computer running software applications such as ControlView to monitor and supervise the ongoing processes Chapter 1 Introducing the Smart Transmitter Interface RS 232C Connector a programmable controller with Allen Bradley s pass through functionality connected to a host computer on the DH network running application software to initiate communications Use the RS 232C port labelled RS 232 in Figure 1 1 with the following a host computer using Allen Bradley DF1 protocol connected to the Communications Controller by an RS 232 cable if the distance is less than 50 feet a host computer using Allen Bradley DF1 protocol connected to the Communications Controller by telephone lines and modems The Communications Controller requires an external 24 VDC power supply It provides a multiplexed 32 channel interface to the Terminal Blocks All of the Remote I O and RS 232C communications parameters are set on the Communications Controller using push buttons and a seven segment LED display Figure 1 1 1770 HT1 Communications Controller Connector to Terminal Block s RIO Connector Parameter Parameter Power Connector fom Sett
44. 3 CH 4 12 SH 12 SH 12 SH 1 2 SH 12 position COMBICON connector on Terminal Block gt From HART Field Devices 1 f 90021 Point to point Connection A point to point connection exists when only one HART field device is connected to any particular Terminal Block channel This arrangement allows the transmission of both analog and digital data to and from the HART field device Multidrop Connection A maximum of 15 HART field devices can be connected to each channel on the Terminal Block in a multidrop network A multidrop connection supplies only digital data through the Terminal Block See Figure 1 10 and Figure 2 13 for illustrations of both point to point and multidrop connections Any channel on the Terminal Block can be used for either point to point or multidrop networking and the same Terminal Block can support both at the same time without any special settings or configuration of the hardware 2 14 Phoenix 12 position COMBICON Header 2 Installing the Smart Transmitter Interface Products Figure 2 13 Point to point and Multidrop Connections CH 1 CH2 CH3 CH4 CH 12 SH 12 SH 12 SH 1 2 SH 12 Phoenix 12 position COMBICON Plug Shielded Twisted Labeo M 6 Multidrop HART Field Devices L1 c M se Shield Connected at one end only RESERESERESERSS Shield bridged between cables
45. ALLEN BRADLEY wy Smart Transmitter Interface Products HART Protocol Cat Nos 1770 HT1 1770 1770 HT16 User Manual Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations codes and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation the Allen Bradley Company Inc does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley Publication SGI 1 1 Safety Guidelines for the Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices which should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted manual in whole or in part without written permission of the Allen Bradley Company Inc
46. CH4 CH5 CH6 CH7 12 SH 12 SH 12 SH 1 2 SH NES 7 psp pep prep psp ppm t Channel 1 resistor Channel2resistor Channel 8 resistor 90068 Figure 2 16 HT16 Terminal Block Channels and Corresponding Resistors 12 3 4 5 6 7 8 RINSH 123 4 5 6 7 8 RINSH eo Pod eas ss Channel 1 resistor am m Um Um gum 3 JP JP JP JP JP JP JP Eu Jl JP Pt EES 0 Eye 0 EIS 0 ETE 0 E ye Ee 000930 ES 0 0 Eye 0 EIS 0 EIS D EIS 0 Ewe 0 EIS 0 EI CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH8 CH1 CH2 CH3 CH4 CH5 CH6 CH7 CH J SH 12 SH 12 SH 1 2 SH 12 SH 12 SH 1 2 SH 1 2 SH 12 SH 1 2 SH 1 2 SH 1 2 SH 12 SH 12 SH 12 SH 129 Channel 2 resistor Channel 16 resistor 90067 2 17 Chapter 2 Installing the Smart Transmitter Interface Products Grounding 2 18 Grounding the Communications Controller and Terminal Block Chassis Because the Communications Controller and the Terminal Blocks can be as far as 1000 feet apart it is best to ground each unit locally To ground the Communications
47. CMD STS TNS DATA 46 Table B B contains the diagnostic read reply values for the Smart Transmitter Interface Table B B Diagnostic Read Reply Values Total RS 232C packets received low byte Total RS 232C packets received high byte Total RS 232C packets transmitted low byte Total RS 232C packets transmitted high byte Number of RS 232C retries Number of RS 232C packets where the retry limit was exceeded Number of RS 232C NAKs sent Number of RS 232C NAKs received CO NI OD oy A gt Number of RS 232C bad messages received Number of RS 232C line errors Diagnostic Status This command requests a block of status information from a RS 232C device The reply contains the information in its DATA field The status information varies from device to device The Communications Controller s status block is given in Table 4 J Appendix DF1 Diagnostic Command Support Figure B 5 Diagnostic Status Command Format 1 byte 1 byte 2 bytes 1 byte CMD STS TNS FNC 06 03 Figure B 6 Diagnostic Status Reply Format 1 byte 1 byte 2 bytes 24 bytes CMD STS TNS DATA 46 Diagnostic Counter Reset This command resets the diagnostic counters listed in Table B B Figure B 7 Diagnostic Counter Reset Command Format 1 byte 1 byte 2 bytes 1 byte CMD 06 STS TNS FNC 07 Figure B 8 D
48. Channel 25 Byte 4 Bit 7 Channel 24 Bit 0 Channel 17 Byte 5 Bit 7 Channel 16 Bit 0 Channel 9 Byte 6 Bit 7 Channel 8 Bit 0 Channel 1 Channel in Burst Monitor Mode scan list with 1 bit per channel 0 channel not in scan list 1 channel in scan list Byte 7 Bit 7 Channel 32 Bit 0 Channel 25 Byte 8 Bit 7 Channel 24 Bit 0 Channel 17 Byte 9 Bit 7 Channel 16 Bit 0 Channel 9 Byte 10 Bit 7 Channel 8 Bit 0 Channel 1 Number of BTW requests received on RIO link Byte 11 low byte Byte 12 high byte Number of BTW data blocks received from programmable controller Byte 13 low byte Byte 14 high byte Number of BTW data blocks received via pass through of programmable controller Byte 15 low byte Byte 16 high byte Reserved Programmable Controller Communication with HART Field Devices Chapter 4 Communicating with the Smart Transmitter Interface Table 4 J Response to Read ID Command Data Byte Status reply A Eam 3 34 DF1 on RS 232 in Full Duplex mode 36 DF1 on RS 232 in Half Duplex mode 4 Extended Processor Type 57 5 Series Revision Bits 0 4 0 Revision A 1 Revision B etc Bits 5 7 0 Series 1 Series B etc 6 16 Bulletin Name in ASCII 1770 HT1 Programmable Logic Controllers communicate with HART field devices using block transfers over the RIO link to the Smart Transmitter Interface Commands are sent in the for
49. Communications Controller Computer 1 Shield TXD2 3 RXD RXD3 2 TXD RTS 4 gt 5CIS CT 5 4 RTS GND 7 7 GND DSR6 lt 20 DTR DCD8 gt 6 DSR DTR 20 8 DCD Figure 2 26 Connection to IBM Computer with Handshake Signals 9 pin Communications Controller Computer 1 Shield TXD2 2 RXD RXD3 3 TXD RTS 4 gt 8 CTS CT 5 7RTS GND 7 5 GND DSR6 4DTR 08 lt gt 6 DSR DTR 20 1DCD 90010 2 28 Chapter 2 Installing the Smart Transmitter Interface Products Modem Connections The Communications Controller can be connected to a modem via a direct 25 pin to 25 pin cable which you must construct using Belden 8723 or equivalent cable Important The length of the cable must not exceed 50 feet and the cable shield must be connected to chassis ground using Pin 1 at the Communications Controller end only between a Communications Controller RS 232C Serial Port and a Modem Communications Controller MODEM 1 Shield TXD2 ac 2 RXD RXD3 3 TXD RTS 4 4 RTS CTS5 lt lt 5 CTS DSR6 lt 6 DSR GND 7 7 GND DCD8 lt 8 DCD DTR 20 20DIR 90000 The Communications Controller can be connected to any standard asynchronous dial up modem Important Some modems are designed to respond to the DTR signal by answering the phone whether it is ringing or not Since the Communications Controller asserts DTR at all times except during the hang up se
50. Conversion Definition of Terms HART Poll Packets HART Delimiter HART 5 HART Command Byte Count Data E Check Bylo 122i rese eer RARE qu IEEE V ARR ERR HART Response and Burst Data Packets Preamble d p rd a ea Ec RERO acces d HART Delimiter dix ume HARI Address ee a ida tee booed weed HART Command Byte COUNT c Response Code u c sen waxes N e E E EER Ca ea ote s Check Byle ren mE SA E Smart Transmitter Interface Packets Received by the Smart Transmitter Interface Smart Transmitter Interface Smart Transmitter Interface Channel Smart Transmitter Interface Control Smart Transmitter Interface Smart Transmitter Interface Data Smart Transmitter Interface Packets Sent by the Smart Transmitter Interface Smart Transmitter Interface Command Smart Transmitter Interface Channel
51. IT LL save RS 232 Communication Parameter Current Setting Sub Menu Indicator 90012 Once in the sub menu you select and change parameters in the same manner as in the main menu using the VIEW and DATA buttons When the last sub menu parameter is reached you can press VIEW to go back to the first sub menu parameter As described previously you can press the EXIT button alone to return to the main menu or press VIEW and EXIT simultaneously to save all changes and return the Communications Controller to run mode Table 3 C describes each advanced sub menu communication parameter and its valid settings Chapter 3 Configuring the Communications Controller Table 3 C Sub Menu Advanced RS 232C Communication Parameters Number of Retries Number of allowable retries per attempt on the RS 232C link Valid numbers are 00 no retries per attempt to 10 10 retries per attempt DF1 ACK Timeout The time to wait for an acknowledgement ACK from the host 1 second 10 computer The timeout is from 0 1 to 5 seconds in 0 1 second I increments 1 50 To calculate the timeout multiply the number in the display by 0 1 second For example a setting of 14 means 14 x 0 1 1 4 seconds Flow Control Determines whether modem handshake lines are used for flow control Disabled 00 E Disabled 00 Enabled 01 Flow control is normally enabled when communicating with a modem CTS to TX Delay The d
52. Number 00 1F FF Smart Transmitter Interface Control Smart Transmitter Interface Parameter Smart Transmitter Interface Data 1 d 10 00 000 No Response Required Bit 1 Response Not Required 90075 Smart Transmitter Interface Command The first byte of the header contains one of the valid commands listed in Table 4 E This command indicates to the Smart Transmitter Interface how the remaining data in the header and the optional Smart Transmitter Interface Data field should be processed Smart Transmitter Interface Channel The second byte of the header contains the channel number that the host processor wants to address Each Smart Transmitter Interface supports up to 32 channels Address each of these using the hexadecimal numbers 00 to 1F For commands intended for the Smart Transmitter Interface rather than a particular channel use hexadecimal FF in this field Important Address value hexadecimal 00 represents channel 1 address value hexadecimal 01 represents channel 2 address value hexadecimal 1 represents channel 32 4 Communicating with the Smart Transmitter Interface Table 4 E Valid Smart Transmitter Interface Commands from the Programmable Controller or Host Computer Command Smart Description Number Transmitter Hex Interface Command 00 No Operation Command is ignored by the Smart Transmitter Interface A No Error response is sent if requested by the host
53. S 232C port The last received command cannot be processed 02 No Corresponding The Smart Transmitter Interface received a BTR but does not TW know what data is being requested All BTRs must be preceded by a BTW indicating what response to return in a BTR 03 Command Stillin The Smart Transmitter Interface is still obtaining the HART Progress Response from a field device and cannot respond with the requested data The programmable controller should reissue the BTR request to obtain the response Command Errors 10 Invalid Command The Smart Transmitter Interface command is invalid and cannot be processed 11 Invalid Channel The Smart Transmitter Interface channel number is invalid Number The command cannot be processed 12 Invalid HART The HART packet encapsulated within a Smart Transmitter Message Interface packet is invalid and cannot be forwarded to a field device 13 Invalid Channel The channel list provided with the Enable Burst Monitor Mode List command contains an invalid entry or is incorrectly terminated The command cannot be processed 14 Invalid Parameter An invalid parameter is provided with the Smart Transmitter Interface command and so it cannot be processed 15 Invalid Control An invalid control byte is included with the Smart transmitter Interface command The command cannot be processed 16 Invalid DF1 Packet The length of the DF1 packet is not consistent with the length Length specification in tha
54. Transfer Read BTR The Smart Transmitter Interface receives similar packets from and sends them to the host processor on the RS 232C link in the form of DF1 commands and responses instead of Block Transfer Writes and Reads Data Routing in Burst Monitor Mode In Burst Monitor mode the Smart Transmitter Interface watches specified channels for HART burst data from field devices and places this data in a Burst Data table Programmable controllers request this data via a BTW to the Smart Transmitter Interface which returns the data from the Burst Data Table in a BTR Host computers request and receive this data via DF1 commands and responses rather than BTWs and BTRs 4 Communicating with the Smart Transmitter Interface Figure 4 2 Layered Nature of Protocols Layer3 33333 L3 DF1 Packet eee DLE BCC CRC STX ETX DST DLE SRC CMD STS TNS FNC LEN Layer 2 Smart Transmitter Interface Packet Smart Transmitter Interface Command Channel Number Control Parameter LEA Layer 1 mei LT HART Packet L J L Preamble Delimiter Address HART Command Byte Count Data Check Byte 90066 Protocol Conversion The Smart Transmitter Interface receives data in one of three protocols HART Smart Transmitter Interface and DF1 Figure 4 2 illustrates the layered nature of these three protocols
55. Transmitter Interface converts the packets from the host processor into packets conforming to the HART protocol by extracting the HART data and adding preambles and relays them to the specified HART field device When it receives a packet from a HART field device the Smart Transmitter Interface converts it into the packet format appropriate to the host processor and sends it on when required The Smart Transmitter Interface and HART field devices send and receive HART packets over the 4 20 mA loops 4 1 4 Communicating with the Smart Transmitter Interface Figure 4 1 System Data Flows with a Smart Transmitter Interface DF1 Commands gt C _ DF1 Responses All packets on this we link are DF1 packets RS 232C dmi E Yr nn m m ees ss a Programmable Controller Field HART Poll id All packets on this link _ are Smart Transmitter Interface 4 20 mA packets HART Response or All packets on this link HART Burst Data are HART packets 90065 Data Routing In Poll and Response Mode A Smart Transmitter Interface operating in the Poll and Response mode receives packets as Block Transfer Write BTW data from a programmable controller and forwards those packets as HART polls to the field device When the field device responds the Smart Transmitter Interface routes that response to the programmable controller as data in a Block
56. adecimal 06 indicating an ACK frame with a short frame address low byte HART short frame address is hexadecimal 80 indicating primary master burst mode disabled logical and slave address of 0 high byte Word 03 HART command is hexadecimal 00 low byte HART packet byte count is hexadecimal OE indicating 14 bytes of data between this byte count and the check byte high byte Word 04 first byte of HART response code is hexadecimal 00 indicating no communications errors low byte second byte of HART response code is hexadecimal 00 indicating no device errors high byte Word 05 Hexadecimal FE low byte Manufacturer s Identification code hexadecimal 26 for Rosemount high byte Word 06 Manufacturer s device type code is hexadecimal OD for a 3044C temperature transmitter low byte minimum number of preambles required by the device is hexadecimal 06 high byte Word 07 Revision Level of the Universal Command Document implemented in this device is hexadecimal 05 low byte revision level of the Transmitter Specific Document implemented in this device is hexadecimal 02 high byte Word 08 Software revision level of this device is hexadecimal 01 low byte hardware revision level of this device is hexadecimal 50 high byte 4 Communicating with the Smart Transmitter Interface Word 09 HART hexadecimal flag assignment is 00 low byte most significant byte of 24 bit device identific
57. al and a2 and the other two HT8 s are joined to the 1 in a star connection by cables b and c Figure 2 5 Example 3 Star linear Connection i 2 D pe i 3 xL a 1770 HT1 ANS 1770 HT8 20064 Cable Size Cable a1 Cable a2 Cable b Cable Belden 85168 250 ft 200 ft 200 ft 100 ft Chapter 2 Installing the Smart Transmitter Interface Products Connector and Pinout Attach the 17 position Phoenix COMBICON plugs supplied to each end of the cable see Figure 2 6 then plug them into the units Use the bare wire for chassis ground to be connected at one end only preferably to the Communications Controller end Use only one twisted pair for each pair of signals The colors in the table below are intended as examples only You can use any pair you like for any pair of signals The pinout for the connector is in the table below Signal Pin Examples of Colors Chassis Ground 1 Shield Bare Silver 24 VDC 2 Power Red and White twisted pair Red is VDC White is Ground Signal Ground 3 Control see Appendix C Transmit Enable Control Red and Black twisted pair Transmit Enable Control Red is Black is Channel Select 1 Channel Select 1 Control Blue and Black twisted pair Blue is Black is Channel Select 2 Control Channel Select 2 4 5 6
58. as the Communications Controller Refer to your application s documentation to determine what error detection it is using and set the Communications Controller to the same setting Station Address The station address of this Communications Controller on the RS 232C link Valid addresses are 00 77 octal inclusive Sub menu Parameters Lets you into the sub menu when the DATA key is pressed to set the advanced N A communication parameters the data display will show two dashes See the section below on Advanced communication parameters for more information Series and Revision Displays the series and revision level of the Communications Controller The first N A digit shows the series A J the second the revision A J For example Series A Revision B is displayed as AB You cannot set this value Chapter 3 Configuring the Communications Controller 3 8 Advanced RS 232C Communication Parameters The advanced communication parameters for the RS 232C link are located in the sub menu When parameter 9 the sub menu entry parameter is shown on the left display the right display shows dashes Press the DATA button to enter the sub menu and display the sub menu parameter numbers The number on the left changes from 9 to 0 and its decimal point lights up remaining lit as long as you are in the sub menu Figure 3 3 Sub Menu Indicator RIO POWER Ro 5 232 HART FAULT y oop VIEW DATA EX
59. ation number is hexadecimal 00 high byte a Word 10 middle byte of 24 bit device identification number is hexadecimal 15 low byte least significant byte is hexadecimal 11 high byte The 24 bit device ID is hexadecimal 001511 Word 11 HART packet check byte received is hexadecimal 09 low byte zero padding high byte Table 4 P Programmable Controller to Smart Transmitter Interface BTW Data Long Frame Format for HART Command 1 Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00 Decimal Bits 15 14 18 12 11 10 09 08 07 06 05 04 03 02 01 00 Word 00 Smart Transmitter Interface Channel Number Smart Transmitter Interface Command Word 01 Smart Transmitter Interface Parameter Smart Transmitter Interface Control Word 02 HART Address HART Delimiter Mas 0 Manufacturer Lng 0 0 0 0 Frame Type Adr Identification Code Frm Word 03 Device ID Manufacturer s Most Significant Byte Device Type Word 04 Device ID Device ID Least Significant Byte Middle Byte Word 05 Byte Count HART Command Word 06 0 0 Check Byte Table 4 Q Example BTW Data Offset at D9 10 Long Frame Format for HART Command 1 Address 0 3 4 5 6 09 10 0110 0000 682 0000 1115 0001 0000 Long Frame Word Contents Programmable Controller to Smart Transmitter Interface Offset at D9 10
60. ations Controller Figure C 1 is one where the Smart Transmitter Interface products can be placed close enough together for the cable to carry both control signals and power See Chapter 2 Figure 2 3 to Figure 2 5 for examples Figure C 1 Cable Carrying Control Signals and Power HT1 amp CONTROL LINES gt HT8 For all plugs and cables line 1 shield line 2 power lines 3 to 17 control gt HT6 Appendix Cable Length and Power Supply Requirements If the Terminal Blocks are to receive power via the cable the power cable length requirements explained below must be adhered to If a Terminal Block is too far from the Communications Controller to meet these cabling requirements an external 24 VDC power supply must be used In any given Smart Transmitter Interface installation there may be some Terminal Blocks receiving power from the Communications Controller via the cable and others receiving power from an external power supply Figure C 2 shows an example installation with a 1770 HT16 Terminal Block close enough to the Communications Controller to receive power via the cable and a 1770 HT8 Terminal Block requiring an external power supply If you are not using line 2 of the digital communications cable for power to a particular Terminal Block do not connect that wire to its connector Figure C 2 Power Provided to a Terminal Block by an External Powe
61. cations Communications Controller A 2 Terminal Block HT16 _ 4 Terminal Block HT8 _A 3 End of Message to RTS Off 3 9 Environmental specifications Communications Controller A 2 Terminal Block HT16 _ 4 Terminal Block HT8 _A 3 Error detection 3 7 Exit 3 2 without saving 3 5 F Factory defaults 3 3 Fault 5 3 hardware fault number 3 5 indicator 3 5 Faults hardware 5 3 Flow Control 3 9 Format diagnostic commands Counter Reset B 3 Loop B 1 Read B 2 Status B 3 diagnostic replies Counter Reset B 3 Loop B 1 Read B 2 Status B 3 Full duplex 4 35 communications 1 6 G Grounding 2 18 H Half duplex 4 35 communications 1 7 Handshake enabled disabled 3 9 Handshake signals connection to IBM computer with 2 28 Hardware faults 3 5 5 3 HART address 4 5 4 10 Command 4 8 4 11 delimiter 4 5 4 9 packet 4 1 4 4 burst data 4 9 poll 4 5 response 4 9 protocol 4 4 HART communications protocol 1 8 and the Smart Transmitter Interface 1 9 burst mode 1 10 poll response mode 1 10 specifications 5 Installation procedure connecting the Controller to the Terminal Blocks 2 4 linear connection 2 5 maximum cable lengths _ 3 star connection 2 6 grounding 2 18 connection to 1771 I O devices 2 12 to HART field devices 2 13 2 14 mounting on DIN rail 2 3 overview 2 2 power supply connections to the Communications Controller 2
62. cks Analog I O Module Loop HT1 HT8 HT16 INTERCONNECT SSS SSS SS Hea OHH HF NM E Connaciot Power Power Fuse Power Connector Board Selected LED ED pi METTRE QUEE 3 Board Address es D EE e m4 123 4 5 6 7 8 RINSH E m Loop Power 8 CHANNEL NI TERMINAL BLOCK CATALOG NO 24 voc z zz m 100 ioo rmm 1 1 gt uu m a gt JP1 JP1 JP1 JP JP1 JPt JP1 Ee 0 D Eye 0 Eye 0 EIS P EIS D EIS 0 EIS D CH1 dos CH3 CH4 CH5 CH6 CH7 CH8 jg 12 SH j 2 SH 1 2 SH 1 2 SH 12 SH 12 SH 1 2 SH 1 2 SH User writeable area Jumpers to select Loop Power HART Transmitters Loop Fuses Connectors 90018 Chapter 1 Introducing the Smart Transmitter Interface Figure 1 3 1770 HT16 16 Channel Terminal Block Connection to Communications Analog I O Module Controller or other Terminal Blocks Connector LED Power Connector Board Selected LED y E Power Fuse IN Board Address Jumpers z 8 CHANNEL 3l E 123 4 5 6 7 8 RINSH 123 4 5 6 7 8 RINSH wy TERMINAL BLOCK no
63. des an additional parameter required by the Smart Transmitter Interface commands hexadecimal 10 20 and 21 If you are not using any of these commands set this field to 0 as indicated in Table 4 G Smart Transmitter Interface Data Smart Transmitter Interface commands hexadecimal 2 and 10 require this extended data field to provide additional information to the Smart Transmitter Interface When not required the Smart Transmitter Interface ignores any data received in this field Figure 4 9 illustrates the format of Smart Transmitter Interface packets transmitted by the Smart Transmitter Interface to the host processor These packets are similar those sent by the host processor Smart Transmitter Interface Command This byte contains the number for the Smart Transmitter Interface command which the Smart Transmitter Interface is sending to the host processor 4 Communicating with the Smart Transmitter Interface Figure 4 9 Smart Transmitter Interface Packets Smart Transmitter Interface to Programmable Controller or Host Computer Smart Transmitter Interface Command Smart Transmitter Interface Channel Number 00 1F FF Smart Transmitter Interface Error Code Smart Transmitter Interface Status Smart Transmitter Interface Data MSB 0000000 po Cold Start Bit 1 Communications Controller powered down or reset Smart Transmitter Interface Channel In this f
64. e loop wiring without disrupting the process signal The HART protocol uses the Frequency Shift Keying technique based on the Bell 202 communication standard Digital communication is accomplished by superimposing a frequency signal over the 4 20 mA current as shown in Figure 1 9 Two individual frequencies 1200 and 2200 Hz represent the digits 1 and 0 The sine wave formed by the two frequency levels has an average value of zero so digital communication takes place without disruption to the analog signal Figure 1 9 Analog and Digital Signals on 4 20 mA Current 0 5 mA r r r 0 Analog Signal 0 5 mA 1200 Hz 2200 Hz lt Average Current Change During Communication 0 90047 Field devices transducers actuators can use the HART protocol to transmit or receive a process variable as a 4 20 mA analog signal at the same time as they are transmitting or receiving device or process data e g smart pressure temperature density etc as a modulated digital signal The analog signal with its faster update rate can be used for control while the digital signal can be used for diagnostic maintenance and additional process data Communication can be in either poll response or burst transmission mode The HART protocol supports digital communication from both a control system and a hand held communications device It also allows multidrop networking by which several smart HART field devices can be connected
65. e response to a BTR set bit 0 of the Smart Transmitter Interface Parameter field The Smart Transmitter Interface will then respond immediately to a BTR with either a HART field device response if available or a Smart Transmitter Interface Error Code hexadecimal 03 This error code indicates that the Smart Transmitter Interface is still attempting to obtain the field device response When the programmable controller receives a Smart Transmitter Interface Error Code hexadecimal 03 it should retry the BTR until either the field device response is available or a communications failure is reported Your host computer cannot use bit 0 of the Smart Transmitter Interface Parameter field in the above fashion Rather the host computer should wait until either the field device responds or a communications failure occurs In either case the Smart Transmitter Interface will send a response message to the host computer as specified by the DF1 protocol Read Burst Data hexadecimal command 11 Use this command to read HART burst data from the Burst Data table This table contains the latest data available from the bursting device on the specified channel Send the command via a BTW or DF1 packet The data is returned in the next BTR or DF1 packet The Smart Transmitter Interface Data field in the response will contain a HART Burst Data packet If the Smart Transmitter Interface fails to receive data from a bursting device it returns Smart Transmitter Inte
66. ee Figure 2 19 The jumper on the Terminal Block for the channel must be set to E enable Set Jumper JP to this position For this type of HART transmitter D Disable loop supply External power supply E Enable loop supply Power drawn from the 4 20 mA loop Power Supply Requirements The external power supply required to power the HART field devices may be from 24 to 32 VDC The exact power supply needed depends on the type of HART field device and the length and gauge of the cable connecting it to the Terminal Block For example a 24 VDC 0 1 power supply with a 1 Ampere output would be adequate to supply loop power to 32 Rosemount 3051C or 3044C field devices over a 20 gauge or larger cable with a length of 1000 feet or less See Appendix C for further details Fuses for the Terminal Blocks One fuse on the Terminal Block either the 1770 HT8 or 1770 HT16 is for the external power supply providing loop power to HART field devices through the Terminal Block It is located immediately to the left of the power connector The 1770 HT8 requires a 0 25 Amp fuse and the 1770 HT16 requires a 0 5 Amp fuse Both fuses should be UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 250V fast acting Connecting the Power Supply for Loop Power To connect the power supply to the Terminal Block 1 Turn the power supply off 2 Attach the 3 position Phoenix COMBICON plug supplied with the product to the output cable of the power supply
67. elay between the Clear to Send CTS signal and the start of No delay 00 transmission half duplex only The delay is from 0 seconds to 0 99 seconds in 10 ms 0 01 second increments 00 99 To calculate the delay multiply the number in the display by 0 01 seconds For example a setting of 48 means 48 x 0 01 0 48 seconds This parameter only takes effect when the Controller is in half duplex mode and handshaking is enabled It is only required when communicating with radio modems that require a delay after exerting the CTS signal Refer to your modem manual for this information End of Message to RTS The delay between the end of a message and the Communications No delay 00 Off Controller setting Request to Send RTS inactive The delay is from 0 seconds to 0 99 seconds in 10 ms 0 01 second increments 00 99 To calculate the delay multiply the number in the display by 0 01 seconds For example a setting of 50 means 50 x 0 01 seconds 0 50 seconds This parameter is only required when communicating with modems that require a delay between sending the last character and raising the RTS signal Refer to your modem manual for this information This parameter only takes effect when the Communications Controller is in Half Duplex DF1 mode and handshaking is enabled Duplicate Message Determines whether duplicate message detection is enabled Disabled Enabled 01 Detection 00 Enabled 01 If enabled the Communicatio
68. en the host processor and the Communications Controller The Communications Controller interprets and responds to the following diagnostic commands from the host processor Table B A Communications Controller Diagnostic Commands Description Command Byte Function Code hex Diagnostic Loop 06 00 Diagnostic Read Counters 06 01 Diagnostic Status 06 03 Reset Diagnostic Counters 06 07 Diagnostic Loop You can use this command to check the integrity of the transmissions over the communication link The command message transmits up to 243 bytes of data to a node interface module The receiving module should reply to this command by transmitting the same data back to the originating node Figure B 1 Diagnostic Loop Command Format 1 byte 1 byte 2 bytes 1 byte 243 bytes max CMD STS TNS FNC DATA 06 00 Figure B 2 Diagnostic Loop Reply Format 1 byte 1 byte 2 bytes 243 bytes max CMD STS TNS DATA 46 Appendix DF1 Diagnostic Command Support Diagnostic Read This command reads the diagnostic counters from the Communications Controller The format of these counters is given below The address and size fields can have any value but they must be included Figure B 3 Diagnostic Read Command Format 1 byte 1 byte 2 bytes 1 byte 2 bytes 1 byte CMD STS TNS FNC ADDR SIZE 06 01 0000 00 Figure B 4 Diagnostic Read Reply Format 1 byte 1 byte 2 bytes 10 bytes
69. ent Loop Interfaces see Figure A 1 Channels I O Module Connector I O Module Cable Length Field Device Connector Loop Fuses eight 4 20 mA current loops Phoenix COMBICON header and plug 10 position 1 set 12 24 AWG 30 foot 9 m maximum between the Terminal Block and the Analog I O module Phoenix COMBICON header and plug 12 position 2 sets 12 24 AWG UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 0 1 Amp 250V fast acting Appendix Product Specifications Electrical DC Input Voltage 24 32 VDC for 4 20 mA current loops if required DC Current Maximum of 0 2A or as required for all 4 20 mA current loops connected Fuse UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 0 25 Amp 250V fast acting Connector Phoenix COMBICON header and plug Power Consumption Physical Dimensions Weight Mounting Environmental Operating temperature Storage temperature Operating humidity 16 Channel Terminal Block 1770 HT16 Connector Input 3 position 12 24 AWG 4 8 watts maximum or as required for all 4 20 mA current loops connected 4 3 10 9 cm wide x 9 9 25 cm long x 2 7 6 9 cm high 1 3 Ib 0 6 kg approximate DIN rail EN 50 022 or EN 50 035 0 C to 60 C 32 F to 140 F 40 C to 60 C 40 F to 140 F 5 to 95 non condensing 1770 HT1 Interface Phoenix COMBICON header and plug 17 position 12 24 AWG 24 VDC for control electronics differential channel select signals
70. erface station address in hexadecimal SRC host station address in hexadecimal CMD hexadecimal STS status byte TNS tranxaction number 2 bytes FNC 95 hexadecimal LEN length of Smart Transmitter Interface Packet in bytes SCMD Smart Transmitter Interface Command CHN Smart Transmitter Interface Channel CTL Smart Transmitter Interface Control PRM Smart Transmitter Interface Parameter ETX end of text control character 03 hex BCC CRC Block Check or CRC bytes 90079 Figure 4 16 Example Half Duplex DF1 Command Enable Poll and Response Mode DLE SOH STN DLE STX DST SRC CMD STS TNS vis 8 28 m 4 38 Smart Transmitter DLE ETX BCC Interface Packet 8 4 Communicating with the Smart Transmitter Interface In both full duplex and half duplex mode the DF1 responses from the Smart Transmitter Interface are identical These responses are sent immediately by the Smart Transmitter Interface in full duplex mode However in half duplex mode the host must first send a poll to the Smart Transmitter Interface before it will send the DF1 Response Figure 4 17 and Figure 4 18 illustrate the format and an example of these responses Figure 4 17 DF1 Packet sent by the Smart Transmitter Interface to a Host Computer Smart Transmitter SCMD CHN ERR STA DATA Interface Packet CMD STS TNS LEN DATA
71. erface transmits HART Poll packets to field devices using the format illustrated in Figure 4 3 and Figure 4 4 The host processor provides data for all fields except the preamble If you are using a programmable controller as host processor you provide data for the HART device via Block Transfer Writes to the Smart Transmitter Interface If you are using a computer as host processor you provide the data by using the computer s software to send DF1 commands to the Smart Transmitter Interface Preamble The preamble is a number of hexadecimal FF characters that precede all frames sent to the HART field device The size depends on the field devices being used but it can be from 2 to 32 hexadecimal The default is 10 The Smart Transmitter Interface inserts the required preamble before each packet or frame transmission to the HART device This is done automatically so you do not have to program the host processor to do this HART Delimiter This is a one byte field that is used to identify the frame type Set the frame type as STX 010 to identify this packet as a HART poll Also indicate whether a short or long frame address follows this byte by specifying hexadecimal 02 for a short frame address or hexadecimal 82 for a long frame address HART Address The Smart Transmitter Interface addresses HART field devices using either a short or long frame address format as specified by the HART Delimiter byte A short frame address is one byte lo
72. for distances equal to or less than 50 feet or two modems for distances greater than 50 feet See Figure 1 6 and Figure 1 7 This gives end users with less complex applications inexpensive access to HART field devices and to the advantages of the HART protocol Figure 1 6 Full Duplex Communication with no Modem HART Field Devices 90050 Transmitter Interface HOST COMPUTER Figure 1 7 Full Duplex with Modems mM Smart HART Transmitter Interface Devices 90049 Chapter 1 Introducing the Smart Transmitter Interface Half Duplex Communications DF1 half duplex systems can be considerably more extensive The host computer can communicate via modems to a number of Smart Transmitter Interfaces spread out over great distances Once again though programmable controllers can certainly be a part of such a network they are not required and any host with third party software can be used with the Smart Transmitter Interface Figure 1 8 Half Duplex Communications with Modems Half Duplex HOST COMPUTER Smart Smart Transmitter Transmitter Interface Interface HART HART Field Field Devices Devices 90048 Chapter 1 Introducing the Smart Transmitter Interface The HART Protocol The HART field communications protocol carries digital information with the analog signal over industry standard 4 20 mA process control loops Both the digital and analog signals occur simultaneously on the sam
73. gnal Ground 2 25 Smart Transmitter Interface channel 4 14 4 17 Command 4 14 4 16 commands 4 15 4 19 control 4 15 error codes 4 17 4 1 packet 4 1 4 4 parameter 4 1 status 4 17 A Specifications Communications Controller electrical _ 2 environmental _A 2 physical _A 2 RIO Interface _A 1 RS 232 Interface _A 1 terminal block interface _A 1 Terminal Block HT16 current loop interface _ 4 electrical _ 4 environmental _ 4 HT1 interface _A 3 physical _A 4 Terminal Block HT8 current loop interface A 2 electrical A 3 environmental A 3 HT1 interface A 2 physical A 3 Station address 3 7 Sub menu 3 8 indicator 3 8 parameters 3 9 l 4 Index T Terminal Blocks board address jumpers _2 9 function 1 3 illustration 1770 HT16 1 4 1770 HT8 1 3 JP jumper blocks 2 20 using a separate power supply for C 4 Timeout DF1 ACK 3 9 Transmit Data 2 25 U Unable to save 5 1 V Values Diagnostic Read Reply B 2 Verifying parameters 3 10 View 3 2 ALLEN BRADLEY Allen Bradley has been helping its customers improve productivity and quality for 90 years ROCKWELL INTERNATIONAL COMPANY A B designs manufactures and supports a broad range of control and automation products worldwide They include logic processors power and motion control devices man machine interfaces and sensors Allen Bradley is a subsidiary of Rockwell International one of
74. gure Advanced RS 232C Parameters 5 To enter the sub menu press VIEW until parameter 9 appears in the left display then press DATA When you are in the sub menu the decimal to the right of the parameter number lights up to distinguish this menu from the main menu Use the VIEW and DATA buttons as described in steps 2 to 4 to review and modify the advanced parameter settings You can press EXIT to return to the main menu from the sub menu if necessary This does not end the configuration session and you may go back to the sub menu as described in step 5 Save and Exit 7 To save the new data and exit configuration mode press the VIEW and EXIT buttons simultaneously All parameters in both the main menu and the sub menu will be saved in non volatile memory and the Controller will return to run mode This ends the configuration session If the save is successful each display will show three dashes see Figure 3 2 for a period of two seconds When the Communications Controller returns to run mode the new configuration takes effect immediately and the displays turn off Chapter 3 Configuring the Communications Controller Important If you change any of the RIO parameters see Table 3 B and then press VIEW and EXIT the display cycles through the numbers 1 3 after showing the three dashes This indicates that the Communications Controller has saved the new parameters in non volatile memory and then gone throug
75. h a reset cycle to bring the new parameters into effect Figure 3 2 Successful Save Display 1 SH 2 RIO POWER Ro RS 232 HART FAULT 2 000000000000 0000000000000 RS 232 WES BB O00 VIEW DATA EXIT 1 save 90013 If the save is not successful the Communications Controller is malfunctioning The left display will show hardware fault number 6 see Table 5 C and the fault indicator will light If this happens you should contact your A B representative Exit Without Saving Press only the EXIT button while in the main menu to take the Communications Controller out of configuration mode and into run mode without saving any changes This ends the configuration session and the previous settings will remain in effect 3 5 Chapter 3 Configuring the Communications Controller Communication Parameters 3 6 Pressing only the EXIT button while in the sub menu takes the Communications Controller back to the main menu You can move between the two menus as much as you need to during any given configuration session Important If the Communications Controller is left inactive 1 e with no buttons pressed in configuration mode for 3 minutes it returns to run mode Any changes made since going into configuration mode will not be saved Also if power to the Communications Controller is interrupted while in configuration mode any changes made will not be saved Setting Factory Defa
76. hat device Field devices detecting a communications error set the most significant bit bit 7 of the first byte and identify the error in the other seven bits as shown in Table 4 C If the last message was received without error the field device will clear bit 7 and return a device dependent response code in the other seven bits The second byte of this response code returns the operating status of HART field devices as indicated in Table 4 D This byte may default to 0 when a communications error occurs as indicated by bit 7 of the first byte being set Important The host processor should ignore any values in the data field when a communications error is detected Table 4 C HART Protocol Communication Error Code Bit Error Code Description 7 Communications Error If set the field device has detected a communications error Bits 0 6 indicate the type of error 6 Vertical Parity Error The parity of one or more of the bytes received by the HART field device is incorrect 5 Overrun Error At least one byte of data in the receive buffer of the HART field device was over written before it was read 4 Framing Error The stop bit of one or more bytes received by the HART field device was not detected 3 Longitudinal Parity Error The longitudinal parity calculated by the HART field device does not match the longitudinal parity byte at the end of the packet 1 Buffer Overflow The packet is too long for the receive buffer of the HART fie
77. he Smart Transmitter Interface HART Address When field devices respond to HART polls they send packets with the same short or long frame address format used in the poll The field device sets or clears the master address bit depending on which master the response is for If the device is also bursting data it sets the burst mode address bit otherwise it clears this bit You must program the host processor to verify that the address field in a HART Response packet is correct before it processes the remaining data in the packet Figure 4 6 HART Response or Burst Data Packets HART Field Device to Smart Transmitter Interface Short Frame Format HART Comman Short Frame HART Address 1 Byte Count HART Delimit Response Code Preamble Data ET peel r Check Byte TTT Slave Adddress Bits Logical Address Bits Device Burst Mode Bit 0 Disabled 00000 TR bn aster Address Bi Frame Type 0 Secondary 001 Burst Frame Master 110 Frame 1 Primary Master Reserved Long Short Frame Bit 0 Short 1 Long 90071 When the host processor requests data from the Burst Data table the packet that is received contains either a short frame or long frame address depending on the field device which sent that data to the Smart Transmitter Interface The master address bit may also be in either state as field devices alternate this bit betwee
78. iagnostic Counter Reset Reply Format 1 byte 1 byte 2 bytes CMD 46 STS TNS B 3 Cabling Requirements Between the Communications Controller and the Terminal Blocks Cable Length and Power Supply Requirements This appendix discusses cabling requirements between the Terminal Blocks and the Communications Controller for control signals and 24VDC power explains how to determine when a separate 24VDC power supply is needed for a Terminal Block and describes how to connect it It also provides further details about supplying 4 20mA loop power to 2 wire HART field devices from a Terminal Block The digital communications cable carries both the control signals and power for the Terminal Blocks To carry the control signal clearly the length of cable between the Communications Controller and all Terminal Blocks added together must not exceed 1000 feet How the modules are connected star linear or a combination does not change this requirement The 1000 foot maximum cable length applies only to the control signals When power 24 VDC is being supplied over the cable to the Terminal Blocks the maximum cable length is further restricted because of the power drawn by the Terminal Blocks The exact length allowed depends upon the number of Terminal Blocks being powered the gauge of wire being used and the wiring configuration The simplest cabling scheme between the Terminal Blocks and Communic
79. iagnostic Loop format B 1 Diagnostic Read format B 2 Diagnostic Status format B 3 Communication parameters 3 1 advanced 3 1 3 8 basic 3 1 3 6 configuring advanced 3 9 basic 3 7 other 3 7 verifying 3 10 Communications Controller configuring 3 1 function 1 1 hardware faults 5 3 illustration 1 2 modes 3 1 push button operation 3 3 push buttons 3 2 specifications 1 Index Configuration displays 3 1 3 2 mode 3 1 3 3 3 6 push buttons 3 2 Configuration mode 3 3 Configuring board address jumpers 2 9 Communications Controller 3 4 Connection to IBM computer three wire 25 pin 2 26 9 2 26 with handshake signals 25 pin 2 28 9 2 28 CTS to TX Delay 3 9 Current Loop interface Terminal Block HT16 _A 4 Terminal Block HT8 _ 2 Current setting 3 1 3 4 3 6 D Data 3 2 Data Carrier Detect 2 25 Data Set Ready 2 25 Data Terminal Ready 2 25 Defaults reset 3 3 DF1 packet 4 1 protocol 4 4 4 34 DF1 protocol 3 7 Diagnostic commands _ 1 Diagnostic Counter Reset B 3 command format _B 3 reply format _B 3 Diagnostic Loop B 1 command format B 1 reply format B 1 Diagnostic Read _B 2 command format B 2 reply format B 2 reply values B 2 Diagnostic Status B 2 command format _B 3 reply format _B 3 4 4 4 37 1 2 Index Digital signal 1 8 Displays 3 1 Duplicate message 3 9 E Electrical specifi
80. ice drawing power from the 4 20 mA loop HART protocol a protocol that provides digital communication over an industry standard 4 20 mA process control loop at the same time as the value of a process control variable is being transmitted as a 4 20 mA signal Host Processor the programmable controller or host computer generally a PC connected to the Communications Controller over the RIO or the host computer connected to the Communications Controller s RS 232 port mA milliamp one thousandth of an Ampere Multidrop multiple HART field devices to a maximum of 15 connected in parallel per channel on a terminal block PLC Programmable Logic Controller an Allen Bradley programmable controller P 3 Preface Point to point one HART field device per channel on a terminal block RIO Remote Input Output link that supports remote time critical I O and control communications between a master PLC controller and its remote I O and adapter mode slave processors Transducer Transmitter any one of several field devices that can measure pressure temperature level flow density or other process control variables and then transmit the value of that variable as a 4 20 mA signal Transducers that support the HART protocol are designated as being smart Product Overview Introducing the Smart Transmitter Interface This chapter provides an overview of the Smart Transmitter Interface products a brief introduction to the HART p
81. ield the Smart Transmitter Interface echoes the channel number associated with the response it is sending Smart Transmitter Interface Error Code In this field the Smart Transmitter Interface places the error codes it is returning as described in Table 4 F Smart Transmitter Interface Status The most significant bit in this field is used as a cold start bit On powerup the Smart Transmitter Interface sets it to 1 It remains set until the Smart Transmitter Interface receives an Enable Poll and Response mode command hexadecimal 01 or an Enable Burst Monitor mode command hexadecimal 02 other bits are set to 0 When this bit changes state from 0 to 1 it indicates to the host processor that power was cycled to the Smart Transmitter Interface leaving it in Poll and Response mode with an empty Burst Data Table the number of preambles for all channels set to 10 and the number of retries for all channels set to 3 Upon detecting this condition you should reinitialize the Smart Transmitter Interface as required for your application 4 17 4 Communicating with the Smart Transmitter Interface Table 4 F Smart Transmitter Interface Error Codes Error Code Definition Description hex General Errors 00 No Error The Smart Transmitter Interface processed the last received command and no errors were detected 01 Downloading The Smart Transmitter Interface firmware is being upgraded Firmware over the R
82. imal 42 high byte Word 08 second most significant byte of IEEE 754 primary variable is hexadecimal 91 low byte third most significant byte of IEEE 754 primary variable is hexadecimal 39 high byte Word 09 least significant byte of IEEE 754 primary variable is hexadecimal 56 low byte HART packet check byte received is hexadecimal B3 high byte Serial Communication with the Serial communication between an RS 232C host and the Smart Transmitter Smart Transmitter Interface Interface is carried out using Allen Bradley s proprietary DF1 protocol DF1 is a full or half duplex protocol designed to carry messages intact over a link The protocol delimits messages detects and signals errors retries after errors and controls message flow In a typical network as discussed in this manual the host computer is the master station and the Smart Transmitter Interface is the slave For a complete description of the DF1 protocol you should see the Data Highway Data Highway Plus DH 458 Protocol and Command Set Manual 4 34 4 Communicating with the Smart Transmitter Interface Full Duplex Full duplex protocol isa direct link that allows simultaneous two way transmission requires a system programmer to use interrupts and multi tasking techniques is intended for high performance applications where maximum data throughput is necessary gives faster data throughput than half duplex but is more diffic
83. imal FF in the Smart Transmitter Interface Channel field results in the specified number of retries being assigned to every channel Read Status and Statistics hexadecimal command 30 Use this command to request that the Smart Transmitter Interface return data containing status and statistics for the specified channel Table 4 H illustrates the format of this information in the Smart Transmitter Interface Data field If the specified channel is hexadecimal FF then data for the Smart Transmitter Interface is returned in the Smart Transmitter Interface Data field formatted as in Table 4 I Either response is returned to the programmable controller via the next BTR or to a host computer via a DF1 Response Reset Statistics Counters hexadecimal command 31 Use this command to direct the Smart Transmitter Interface to reset all the statistics counters to 0 so that the counters can be initialized to known values Read ID hexadecimal command 32 Use this command to direct the Smart Transmitter Interface to return a data packet containing an ID code The programmable controller can access this data on the next BTR issued while a host computer will receive this response as specified by the DF1 protocol Table 4 J shows the response format 4 Communicating with the Smart Transmitter Interface Table 4 H Response to Read Channel Status and Statistics Description Channel status Bit 0 0 channel not in Burs
84. imal command 02 This command puts the Smart Transmitter Interface into Burst Monitor mode In this mode the Smart Transmitter Interface monitors the channels specified in the Smart Transmitter Interface Data field for bursting data For example if hexadecimal channels 05 07 and 1E are to be monitored then the Smart Transmitter Interface Data field should contain the four bytes 05 07 1E FF The channel list must be terminated with hexadecimal FF You must still set each of the HART field devices into burst mode before any Burst Data packets can be received by the Smart Transmitter Interface When the Smart Transmitter Interface is monitoring the bursting field devices in a round robin fashion the received data is placed into the Burst Data table You can access this data by sending a Read Burst Data command hexadecimal 11 to the Smart Transmitter Interface Send Message to Device hexadecimal command 10 Use this command to send a HART poll to a field device on the specified channel The HART poll is placed in the Smart Transmitter Interface Data field The Smart Transmitter Interface returns field device responses as data in BTR or DF1 Response The field device response is passed on as is except for the leading preambles which are removed 4 Communicating with the Smart Transmitter Interface The field device response may not be available for several hundred milliseconds so if you wish an immediat
85. ing Status LEDs 2 SMART TRANSMITTER TURA UM UA UR UR UU URN OS a TV E A COMMUNICATIONS CONTROLLER oma orm DATA 0 1 E 1 7 Segment LED User writeable Push Button Switches Display areas 30005 HT8 HT16 INTERCONNECT EJ Chapter 1 Introducing the Smart Transmitter Interface 1770 HT8 16 Terminal Block The Terminal Blocks pass both analog and digital signals to and from the HART field devices The analog signal is passed on to devices such as the Allen Bradley 1771 IFE Analog I O module The digital signal is routed to the Communications Controller Each Terminal Block provides either 8 1770 HT8 or 16 1770 HT16 channels Each channel has connection points for HART field devices and Analog I O modules loop fuses and loop power selection jumpers Any combination of 8 and 16 channel Terminal Blocks can be used to make up the 32 channel maximum The board address jumpers see Figure 1 2 and Figure 1 3 indicate to the Communications Controller which set of channels a particular Terminal Block will use These are set when the Terminal Block is installed see Chapter 2 Figure 1 2 1770 HT8 8 Channel Terminal Block Connection to Communications Controller or other Terminal Blo
86. is prohibited Throughout this manual we use notes to make you aware of safety considerations circumstances that can lead to personal injury or death property ATTENTION Identifies information about practices or damage or economic loss Attentions help you identify a hazard avoid the hazard recognize the consequences Important Identifies information that is especially important for successful application and understanding of the product Interchange ControlView Data Highway Plus and DH are trademarks and PLC is a registered trademark of Allen Bradley Company Inc HART is a registered trademark of Rosemount Inc IBM is a registered trademark of International Business Machines Corporation Table of Contents Preface 1 Purpose of the Manual _ 1 Organization of the Manual _ 1 How to Use This P 1 Audience 5 aeia kei P 2 Related 5 P 2 Allen Bradley Publications P 2 HART Publications P 2 Related Products P 3 Glossary of Terms and Abbreviations P 3 Introducing the Smart Transmitter Interface 1 1 Product Overview
87. ld device 0 Undefined Not defined at this time 4 12 4 Communicating with the Smart Transmitter Interface Table 4 D HART Field Device Error Codes 7 Field Device Malfunction An internal hardware error or failure has been detected by the HART field device 6 Configuration Changed A write or set command has been executed by the HART field device 5 Cold Start Power has been removed and reapplied resulting in the reinstallation of the setup information The first HART command to recognize this condition automatically resets this flag This flag may also be set following a master reset or self test 4 More Status Available More status information is available and can be read using command 48 Read Additional Status Information 3 Primary Variable Analog The analog and digital outputs for the primary variable Output Fixed are held at their requested value They will not respond to the applied process 2 Primary Variable Analog The analog and digital outputs for the primary variables Output Saturated are beyond their limits and no longer represent the true applied process 1 Non Primary Variable Out of The process applied to a sensor other than that of the Limits Primary Variable is beyond the operating limits of the device To identify the variable use command 748 Read Additional Status Information 0 Primary Variable Out of The process applied to the sensor for the primary Limits variable is bey
88. le controller products refer to the Allen Bradley publication index SD499 HART Publications Publication Reference Number and Date HART Smart Communications Protocol Revision 5 1 January 4 1991 Specification Rosemount Inc Document No D9000047 Revision A Related Products Glossary of Terms and Abbreviations Preface The Smart Transmitter Interface Products create a communication interface between programmable controllers and HART field devices They are compatible with HART field devices and with hand held terminals capable of supporting the physical and data link layers of the HART protocol This manual uses the following terms as defined below Actuator any one of several field devices that provide control functions using a 4 20mA input control signal Actuators that support the HART protocol are designated as being smart BTR Block Transfer Read BTW Block Transfer Write Clear a bit equal to 0 Hand held terminal a smart terminal product capable of functioning as either a primary or secondary master to one single HART device using the HART protocol this terminal allows the operator to monitor and configure the HART field device e g Rosemount 268 HART Highway Addressable Remote Transducer HART field device a transducer or actuator that supports the HART protocol 4 wire refers to a HART field device drawing power from an external power source 2 wire refers to a HART field dev
89. ly 3 Insert the plug into the power connection header on the upper right corner of the Communications Controller Figure 2 18 4 Turn the power supply on Important Be sure to turn the power off while connecting the cables Figure 2 18 Connecting the Power Supply to the Communications Controller 24 VDC EARTH COMMON GROUND en p mn rom nr mn mmn pem Communications Controller 90020 HART field devices are of two types those that draw power from the 4 20 mA loop 2 wire transmitters those that require an external power supply 4 wire transmitters The HT8 16 Terminal Blocks support both types and they can be mixed on the same Terminal Block Each channel on the Terminal Block has a jumper block associated with it JPn The n is the number of the channel 1 to 8 or 1 to 16 This jumper block indicates the type of HART transmitter connected to the channel in question Chapter 2 Installing the Smart Transmitter Interface Products If a HART field device is a four wire transmitter it must be connected to its own external power supply and the jumper on the Terminal Block for the channel in question set to D disable If a HART field device is a two wire transmitter it can be powered through the Transmitter Block This requires that the Terminal Block be connected to an external power supply by the power connection header in the upper right corner of the block S
90. m of a Block Transfer Write BTW while responses are received via a Block Transfer Read BTR The Smart Transmitter Interface expects BTWs and BTRs in pairs with the BTW preceding the BTR If the Smart Transmitter Interface receives a BTR without a preceding BTW it will return a Smart Transmitter Interface Error Code hexadecimal 02 see Table 4 F The one exception occurs when the programmable controller specifically indicates that no response is required To do this set bit 6 of the Smart Transmitter Interface Control byte see Figure 4 8 In this case the next transfer should be another BTW You must program the programmable controller to execute the BTW and BTR instructions to transfer data between the programmable controller and the HART field device You can fix both the BTW and BTR data file lengths at the largest values required by your application because the Smart Transmitter Interface does not interpret extra BTW data and pads out BTR data blocks with zeros Figure 4 10 and Table 4 K show an example PLC 5 ladder logic program with its required data files 4 25 4 Communicating with the Smart Transmitter Interface Figure 4 10 Example PLC 5 Ladder Logic Rung 0 B3 COP I COPY FILE 1 Source 09 0 Dest
91. mart Transmitter Transmitter Transmitter Transmitter Interface Interface Interface Interface Data Command hex Channel hex Parameter hex General Commands No Operation Not required Enable Poll and Response Mode 01 Enable Burst 02 FF List of burst Monitor Mode channels Device Commands Send Message to Set bit 0 forno HART poll Device BTR Response Delay Not required Not required Set Number of 00 1F FF Not required Preambles Set Number of 00 1F FF Not required Retries Read Status and 00 1F FF Not required Statistics Reset Statistics Not required Counters Read ID Not required 4 19 4 Communicating with the Smart Transmitter Interface 4 20 No Operation hexadecimal command 00 The Smart Transmitter Interface performs no operation when it receives this command Use it to simplify your programmable controller ladder logic by issuing BTWs and BTRs in pairs and using this command when no specific information is required from the Smart Transmitter Interface When the programmable controller requests a BTR response after the BTW sending hexadecimal command 00 the Smart Transmitter Interface responds with No Error Enable Poll and Response Mode hexadecimal command 01 This command puts the Smart Transmitter Interface into Poll and Response mode Data from any bursting HART field devices is ignored in this mode Enable Burst Monitor Mode hexadec
92. mitter Interface supports one Data Highway Plus host Smart Transmitter Interface using the pass through functionality supported by some Allen Bradley programmable controllers This host requires using proprietary Allen Bradley Interchange Software For further information on using the Smart Transmitter Interface with such a host you should contact your Allen Bradley representative 4 40 Interpreting the Terminal Block LEDs Troubleshooting To aid in troubleshooting this chapter tells you how to interpret the indicators status LEDs and seven segment LED displays on the Communications Controller 1770 HT1 and the Terminal Blocks 1770 HT8 16 If you are unable to save new configurations successfully the left display will display hardware fault 6 and the Fault LED on the front will light up This indicates a malfunction in the module If the displays show symbols other than those shown in this chapter this also indicates that the module is malfunctioning In both cases contact your A B representative The LEDs on the front panel of the Terminal Blocks can help you diagnose problems during installation and operation Table 5 A Terminal Block LED Indicators LED State Probable Cause Recommended Action LOOP ON Normal operation None POWER green OFF No power Replace fuse if blown Ensure wiring to power connector is correct FLASHING Intermittent contact Inspect power connector wiring for loose wire
93. mmunications Controller Cat No 1770 HT1 P 1 Preface Related Publications 2 8 Channel Terminal Block Cat No 1770 HT8 16 Channel Terminal Block Cat No 1770 HT16 Audience This manual is intended for use by persons installing Smart Transmitter Interface products in connection with Allen Bradley PLC controllers or other intelligent controllers System integrators who are designing and establishing network systems involving plant floor machinery programmable controllers HART field devices Smart Transmitter Interface products and host computers maintenance personnel who maintain such systems and who must locate define and correct problems arising during their day to day operation Allen Bradley Publications Publication Reference Number and Date Allen Bradley Data Highway Data Highway Plus DH485 Communication Protocol and Command Set Reference Manual 1770 6 5 16 November 1991 Analog Input Module User Manual cat no 1771 IFE 1771 6 5 90 September 1991 ControlView Core User Manual 6190 6 5 1 November 1992 PLC 5 Family Programmable Controllers Hardware 1785 6 6 1 Installation Manual PLC 5 Programming Software 6200 6 4 7 6008 SI IBM PC Scanner User s Manual 6008 6 5 3 A complete list of publications relating to ControlView and its options is available in the ControlView Core User Manual For a list of publications on Allen Bradley programmab
94. mper block lift the black jumper off the pins it is currently on re position it then push into place See Figure 2 7 Set the board address jumpers as shown in Figure 2 8 Figure 2 7 Jumper and Pins 90057 2 9 Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 8 Terminal Block Board Address Jumpers 1770 HT8 1770 HT16 0 l Channels 1 8 0 Channels 1 16 0 1 Channels 9 16 1 Channels 9 24 e j Channels 17 24 Channels 17 32 e e e e e 1 Channels 25 32 i Invalid Figure 2 9 Example Terminal Block Channel Setup TERMINAL BLOCK CHANNELS ADDRESS JUMPERS HT1 HT8 1st block 1 8 0 0 e e HT16 2nd block 9 24 8 3rd block 25 32 LE E 90051 2 10 Connecting the Terminal Blocks to I O and HART Field Devices Chapter 2 Installing the Smart Transmitter Interface Products Marking the Terminal Block Labels On the label on top of each Terminal Block is a place in the lower left hand corner to record how you have configured the board address jumpers The jumper address configuration options for the unit are listed 3 options for the 16 channel block and 4 for the eight channel block Mark the box to indicate which configuration you have used for this Terminal Block See Figure 1 2 and 1 3 Use a pencil so you can erase the
95. n primary and secondary master when bursting data 4 10 4 Communicating with the Smart Transmitter Interface Figure 4 7 HART Response of Burst Data Packets HART Field Device to Smart Transmitter Interface Long Frame Format HART Command Byte Count Long Frame HART Address 34 L Response Code HART Delimiter Data Preamble Check Byte 1 1 1 Ir 1 _ 1 Higher Order Slave Address Bits Device Burst Mode Bit 0 Disabled 110 0 0 0 1 Enabled Master Address Bit Frame Type 0 Secondary Master 001 Burst Frame 1 Primary Master 110 ACK Frame Reserved Long Short Frame Bit 0 Short 1 Long 90072 HART Command This one byte field echoes the HART command being responded to This is either the last command sent to the device or the HART command for which burst data is being transmitted by the device Program the host processor to verify that this field contains the correct command before it processes the remaining data in the packet Byte Count This one byte field indicates the number of bytes to follow this field excluding the check byte Valid values are 2 to 113 It indicates to the host processor the size of the received data field 4 11 4 Communicating with the Smart Transmitter Interface Response Code This two byte code contains the HART field device status as sent by t
96. ndent maximum is 77 octal Defines the address of the Communications Controller within the rack Valid choices are 00 02 04 06 Is this the last module in the current rack No 00 Yes 01 No 00 To save time in RIO communications and to make sure all modules in a rack are read be sure only the last logical module in each rack is configured as Yes Sets the baud rate the speed in bits second at which data is transferred of the 57 6 57 link between the Communications Controller and Remote 1 0 scanner Possible rates are 57 6 57 115 2 11 230 4 23 Kbits s Sets the baud rate of the link between the Communications Controller and the 9600 96 RS 232C port of the host computer The host computer and the Communications Controller must be set to the same baud rate Possible rates are 300 03 600 06 1200 12 2400 24 4800 48 9600 96 19200 19 Bits s RS 232C Parity Parity of the characters on the RS 232C link The host computer and the None 00 Communications Controller must have the same parity setting Parity can be None 00 Even 01 or Odd 02 DF1 Protocol Sets the DF1 protocol as being either Full duplex 00 or Half duplex 01 Full Duplex 00 Error Detection Two forms of error checking are available on the RS 232C link BCC Block Check BCC 00 Code 00 or CRC16 Cyclic Redundancy Check 01 The application program running on the host computer must use the same error detection
97. ne circuit slave send and master receives on the other aone circuit system master and slaves send and receive on the same circuit 4 Communicating with the Smart Transmitter Interface DF1 Packet Formation In full duplex mode the host computer and Smart Transmitter Interface can transmit and receive simultaneously Once the Smart Transmitter Interface receives a command it can send the response to the host as soon as it is available without waiting for the host to request the response with a separate command Figure 4 13 and Figure 4 14 illustrate the format and give an example of a full duplex DF1 command In half duplex mode the master station controls which station can transmit The master station must also issue poll requests to the Smart Transmitter Interface before the Smart Transmitter Interface will send a response Figure 4 15 and Figure 4 16 illustrate the format and an example of a half duplex DF1 Command Figure 4 13 Full Duplex DF1 Packet sent by a Host Computer to the Smart Transmitter Interface Smart Transmitter SCMD CHN CTL PRM DATA Interface Packet CMD sts TNS FNC LEN DATA Data Link Layer Packet DLE STX DST SRC APPLICATIONDATA DLE ETX Since message is from host to Smart Transmitter Interface DLE data link escape control character 10 hex STX start of text control character 02 hex DST Smar
98. nected This ensures the integrity of the 4 20 mA analog signal being received by the Analog I O module Each unit of the Smart Transmitter Interface is equipped with two plastic feet designed to attach to an EN 50 022 or EN 50 035 DIN rail Using these feet clip the unit s to the DIN rail in the desired position Figure 2 1 The units can be mounted in any orientation horizontally vertically diagonally etc Figure 2 1 Mounting on a DIN Rail ad a e Y Lx Foot DIN Rail 90037 To release the feet from the rail press on the plastic as shown in Figure 2 2 so that the clip is pulled back far enough to release the unit Figure 2 2 Releasing From a DIN Rail E Foot gt J i l IN 0 J DIN Rail gt K Press Here 90038 2 3 Chapter 2 Installing the Smart Transmitter Interface Products Connecting the Communications Controller to the Terminal Blocks 2 4 The Communications Controller can support a maximum of 32 HART channels via the Terminal Blocks Use any of the following combinations one or two 16 Channel Terminal Blocks 1770 HT16 one two three or four 8 Channel Terminal Blocks 1770 HT8 one 16 Channel Terminal Block and one or two 8 Channel Terminal Blocks Digital Communications Cables The connecting cables should be shielded multi conductor cables with 8 twisted 20 24 AWG wire pairs These are not supplied with
99. ng and contains a polling address from 0 to 15 A long frame address is five bytes long and includes a unique 38 bit identifier encoded within each field device by the manufacturer HART field device addressing is device dependent Some devices do not support long frame addressing while others only recognize short frame addressing for HART Command 0 In this situation use HART Command 0 to determine the long frame address and then use long frame addressing for all other HART commands Consult the documentation provided with your field device for details about the addressing formats it supports 4 5 4 Communicating with the Smart Transmitter Interface Figure 4 3 HART Poll Packets Smart Transmitter Interface to HART Field Device Short Frame Format Hart Comman Short Frame HART Address Byte Count HART Delimiter r Data Preamble Check Byte fee __4 Lol Slave Address Bits Logical Address Bits 00000 L Master Address Bit Frame Type 0 Secondary Master 010 STX Frame 1 Primary Master Reserved Long Short Frame Bit 0 Short 1 Long 90069 Figure 4 4 HART Poll Packets Smart Transmitter Interface to HART Field Device Long Frame Format HART Command Long Frame HART Address Byte Count HART Delimiter r Data Preamble Check Byte 1 1 1 11
100. nnection Example F1 i Channel 1 Channel 2 Channel 3 E N 3 LIC 4 Channel 4 4 N Module Common 5 s 6 Channel 5 6 7 Channel 7 8 IC 8 9 10 N SH N C Shield 11 HT8 16 14 G Ground Shield round Shiel 16 at I O chassis mounting bolt eJ 18 N 19 2 N ai 1771 WG Field Wiring Arm 90052 Connecting to HART Field Devices To connect a HART field device to a Terminal Block attach the wires from the HART field device to a 12 position Phoenix COMBICON plug supplied with the Terminal Block Insert the plug into the 12 position Phoenix COMBICON connector on the lower edge of the Terminal Block see Figure 2 12 The 1770 HTS has two of these connectors the 1770 HT16 has four HART field devices can be connected to the Terminal Block in either a point to point or multidrop connection For 2 wire transmitters connect the positive terminal of the transmitter to position 2 on the Terminal Block and the negative terminal of the transmitter to position 1 on the Terminal Block For 4 wire transmitters connect the positive terminal on the transmitter to position 1 on the Terminal Block and the negative terminal on the transmitter to position 2 on the Terminal Block 2 13 Chapter 2 Installing the Smart Transmitter Interface Products Figure 2 12 Connecting HART Field Devices to the Terminal Block CH1 CH2 CH
101. not lose them even if power to the Communications Controller is interrupted Whenever the Communications Controller is in run mode the seven segment display is off to conserve power Important If the Communications Controller displays symbols other than those shown in this chapter it is malfunctioning Contact your A B representative to arrange to return the unit for servicing Displays Figure 3 1 shows the configuration displays on the left end of the Communications Controller The left display one digit shows the number of the communication parameter being configured The two right displays two digits show the current setting for that parameter Communication parameters are configured in two menus a main menu for basic parameters and a sub menu for more advanced parameters for the RS 232C port 3 1 Chapter 3 Configuring the Communications Controller Figure 3 1 Configuration Display and Push Buttons 1 SH 2 RIO POWER Ro 5 22 HART FAULT ajas aog VIEW DATA EXIT save RS 232 Communication Parameter Current Setting 90011 Push Buttons Figure 3 1 shows three push buttons labelled VIEW DATA and EXIT The operation of these buttons is described in Table 3 A 3 2 Configuration Step by Step Table 3 A Push Button Operation Pressing this button or button combination VIEW DATA EXIT VIEW EXIT VIEW DATA Chapter 3 C
102. ns Controller will acknowledge and discard duplicate messages Chapter 3 Configuring the Communications Controller Verifying the Communication Parameters Before connecting the Communications Controller to your network cycle through the parameter settings and verify that they are correct for your network If you have made no changes to the default settings they should appear in the displays When you connect the Communications Controller to your network and turn it on the displays cycle through the numbers 1 3 and then turn off If your parameters are correctly configured and the Controller is connected to the RIO link the RIO LED on the Controller lights up If the RIO LED flashes instead of glowing steadily make sure that only the last module in the rack has its Last Module parameter set to Yes Once you initiate active communication on the DF1 link the RS 232 Activity LED flashes to reflect communication activity If this fails to happen check the RS 232C parameters Table 3 B Parameters 4 8 and Table 3 C or the RS 232C cable If the displays show symbols other than those shown in this chapter the Controller is malfunctioning You should contact your A B representative to arrange to return the unit for servicing For more information on troubleshooting see Chapter 5 Marking the Communications Controller Label When you have configured and verified the communication parameters record the configuration on
103. o the Smart Transmitter Interface over the RIO link An internal table maintained by the Smart Transmitter Interface which stores the latest HART Burst Data received on a monitored channel An Allen Bradley proprietary protocol which defines the format of data packets transmitted over an RS 232C link A data packet formatted according to the DF1 protocol A DF1 packet transmitted by a host computer to the Smart Transmitter Interface A DF1 packet transmitted by the Smart Transmitter Interface to a host computer A communications protocol defining the format of data packets transmitted between the Smart Transmitter Interface and HART field devices A data packet formatted according to the HART Protocol A HART Packet sent by the Smart Transmitter Interface to a field device to poll or write data to it A HART Packet sent by the field device to the Smart Transmitter Interface in response to a HART Poll An unsolicited HART Packet sent periodically by a field device to the Smart Transmitter Interface A communications protocol defining the format of data packets transmitted between a programmable controller and the Smart Transmitter Interface Data packets formatted according to the Smart Transmitter Interface Protocol Frame is another word for packet used extensively in Rosemount HART documentation HART Poll Packets 4 Communicating with the Smart Transmitter Interface The Smart Transmitter Int
104. ol information to the Smart Transmitter Interface If you are using a programmable controller application to send a BTW followed by a BTR clear bit six set bit 6 to 0 in this field If your application sends only a BTW and it does not require a response message from the Smart Transmitter Interface then set bit six to 1 in this field When bit six is set the Smart Transmitter Interface does not expect a BTR to be sent immediately after the BTW and so it does not hold responses in its queue waiting for a BTR When using a host computer you would normally clear all bits If you do not require a response when using hexadecimal Smart Transmitter Interface Commands 00 01 02 20 21 or 31 set bit six to 1 4 15 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface Packets Sent by the Smart Transmitter Interface 4 16 The other bits in this byte are used for communication between host computers residing on the Data Highway Plus and the Smart Transmitter Interface This communication requires special software on the host computer and can only occur with programmable controllers which support pass through functionality ATTENTION You must program the host processor to clear all bits except for bit six in this byte Your application may operate in an unpredictable and unreliable manner if this is not done Smart Transmitter Interface Parameter The last byte of the header provi
105. ond the operating limits of the device Data This field contains the number of bytes of response data associated with the command number specified in the command field An application on the host processor can use this data as required Check Byte This one byte field contains a check byte which the Smart Transmitter Interface uses to verify the validity of data received from the field device If the Smart Transmitter Interface detects a bad check byte it resends HART polls to the device until either a valid response is received or the maximum number of retries have occurred 4 13 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface Packets Received by the Smart Transmitter Interface 4 14 Figure 4 8 illustrates the format of Smart Transmitter Interface packets received by the Smart Transmitter Interface The programmable controller data files or host computer data buffers are formatted similarly for transmission of data to the Smart Transmitter Interface An optional Smart Transmitter Interface Data field follows a required four byte header The host processor places HART packets in the Smart Transmitter Interface Data field when sending HART commands to a field device Figure 4 8 Smart Transmitter Interface Packets Programmable Controller or Host Computer to Smart Transmitter Interface Smart Transmitter Interface Command Table 4 E Smart Transmitter Interface Channel
106. onfiguring the Communications Controller Performs this task In run mode takes the Communications Controller into configuration mode This is the only button that has a function in run mode In configuration mode cycles through the possible communication parameters displayed on the left digit If you hold the button down for more than 1 second the parameter number will advance automatically In configuration mode cycles through the possible communication settings for the parameter shown on the left The data is displayed on the right two digits If you hold the button down for more than 1 second the settings will advance and accelerate automatically When the left display shows 9 press DATA to enter the sub menu In configuration mode from the main menu returns the Controller to run mode without saving any changes The change in mode takes effect when the button is released From the sub menu returns to the main menu In configuration mode saves all configuration changes and returns the Communications Controller to run mode from either menu The Communications Controller will begin operating with the new configuration as soon as it returns to run mode In configuration mode resets all communication parameters to their factory defaults see Table 3 B and Table 3 C The changes do not take effect until the configuration is saved and the Communications Controller returns to run mode i e until VIEW and EXIT are pre
107. ontroller with its own cable Figure 4 Determining Maximum Cable Lengths for Star Connection 1770 HT8 1770 HT8 Channel Select and Data Signals 24 VDC Power Pin 2 a b c d lt 1000 ft a b c and d lt 1000 0 065 R ora b c d lt 305 where R cable resistance per 1000 ft or a b c and d lt 1 0 065 R where R cable resistance per meter 90059 Appendix C Cable Length and Power Supply Requirements Using a Separate Power One way of overcoming the maximum power length restrictions required Supply for a Terminal Block to carry power to the Terminal Blocks is to use a local power supply at the site of the Terminal Blocks rather than providing 24 VDC via the cable between the Communications Controller and the Terminal Blocks This power supply must be connected to pins 2 and 3 of the 17 position connector Important No matter how the Terminal Blocks are powered the total length of the digital communications cable between the Communications Controller and all the Terminal Blocks must not exceed 1000 feet 300 meters and a signal ground must still connect the Communications Controller and the Terminal Blocks at pin 3 via the cable in order to provide a common ground reference Figure C 5 Using a Separate Power Supply 24 VDC 24 VDC for HT1 only 7 t 24 32 VDC for loops ll 3 ground signal 3 HTI HT8 lt CONTROL LINES b
108. ow to install the Smart Transmitter Interface products It includes the following information an overview of the general installation procedure how to connect the Communications Controller and Terminal Blocks to each other so they can communicate how to connect Terminal Blocks to Analog I O and HART field devices system grounding requirements power supply requirements and connections for the Communications Controller and Terminal Blocks how to provide power for HART field devices through the Terminal Blocks how to connect the Communications Controller to the host processor Before installing the Smart Transmitter Interface you should determine where the Communications Controller and Terminal Blocks are to be placed The Terminal Blocks should be mounted in the same equipment cabinet as the Analog I O modules to which they are to be connected The distance between a given Terminal block and its HART field devices must conform to the HART Protocol specifications and meet the requirements in Appendix C review your setup to ensure that the maximum cable length between the Communications Controller and the Terminal Blocks is not exceeded See the section Connecting the Communications Controller to the Terminal Blocks for details calculate the power requirements of the Communications Controller 1770 HT1 the Terminal Blocks 1770 HT8 16 and the HART field devices 2 1 Chapter 2 Installing the Smart Transmitter Interface
109. port for interface to serial hosts 7 segment display and push buttons for communications configuration Chapter 1 Introducing the Smart Transmitter Interface clips for DIN rail mounting connections to 32 HART field devices in point to point configuration point to point and multidrop wiring support poll and response or burst digital transmission mode support connector for providing loop power interface to Analog I O modules with 4 20 mA loop support 2 wire and 4 wire transmitters supported Benefits of Using the Smart The benefits of using the Smart Transmitter Interface to take advantage of Transmitter Interface the HART protocol include the following extend programmable controller use in the process area by enabling Allen Bradley PLCs to communicate with HART field devices thus allowing process monitoring with ControlView or similar applications software Because of the added intelligence supplied by the HART field devices and the wide range of accurate data available from such devices pressure temperature level flow and density among others automated processes can be monitored accurately over considerable distances reduce downtime and installation time through remote wiring verification remote transmitter programming and simple retrofitting capabilities of HART field devices Many HART devices are smart enough to tell you what is wrong with them and how they can be readjusted by remote
110. quence the phone would always appear to be busy Do not use the Smart Transmitter Interface with any type of modem that answers the phone as soon as DTR is asserted The types of dial up network modems that you can use are Manual these are typically acoustically coupled modems The connection is established by human operators at both ends who insert the handsets into couplers to complete the connection 2 29 Chapter 2 Installing the Smart Transmitter Interface Products DTE Controlled Answer these unattended modems are directly connected to the phone lines The Smart Transmitter Interface serves as the data terminal equipment to control the modem via the DTR DSR and DCD signals The Smart Transmitter Interface incorporates timeouts and tests to operate these types of modems properly Auto Answer these modems have self contained timeouts and test and can answer and hang up the phone automatically The Communications Controller has no means of controlling an auto dial modem but it can be used in conjunction with a separate auto dialer If your application requires the use of leased lines you will probably not be using a dial up modem Some non dial up modems are designed to assert a continuous DSR signal a situation that would leave the Communications Controller waiting forever for communication with the modem To avoid this construct your cable with the jumper indicated in Figure 2 28 Figure 2 28 Connection
111. r Supply 24 VDC 2 HT1 e CONTROL LINES gt HT8 line 2 power not attached to connector at HT8 end For all connectors and cables line 1 shield lines 3 to 17 control gt HT16 line 2 power attached to connector at HT16 end 90062 Important No matter which method you choose the total length of the digital communications cable between the Communications Controller and all the Terminal Blocks must not exceed 1000 feet 300 meters Maximum Power Cable Lengths Figure C 3 gives the formula for determining maximum power cable lengths and illustrates its application in a linear connection configuration of four 1770 HT8 units If fewer units are used the variables that do not apply D C etc are set to 0 2 Appendix C Cable Length and Power Supply Requirements Figure C 3 Determining Maximum Cable Lengths for Linear Connection 1 1 1 b gt i lt c gt a d gt Control Signals 24 VDC Power Pin 2 Total cable lengths lt 1000 ft a b c d lt 1000 0 065 R or lt 305 m where R cable resistance per 1000 ft ora b c d lt 1 0 065 R where R cable resistance per meter 90055 Figure C 4 illustrates the formula as it applies to a star connection configuration in which each Terminal Block is wired directly to the Communication C
112. rface Error code hexadecimal 20 along with the response If the data is not available in the channel table because burst data has never been received for this channel then Smart Transmitter Interface returns Error code hexadecimal 22 in the response Set Number of Preambles hexadecimal command 20 Use this command to set the number of preambles transmitted by the Smart Transmitter Interface before sending a HART poll to a field device The default number of preambles is 10 but some devices require fewer and others require additional preambles to operate reliably Use as few as possible the communications bandwidth to a field device increases if you reduce this number The number of preambles from 2 to 32 for the specified channel is defined in the Smart Transmitter Interface Parameter field If the specified channel is hexadecimal FF then the number of preambles for all 32 channels is changed to the number in the Smart Transmitter Interface Parameter field 4 21 4 Communicating with the Smart Transmitter Interface 4 22 Set Number of Retries hexadecimal command 21 Use this command to set the number of retries from 0 to 15 the Smart Transmitter Interface attempts for a specified channel when a field device fails to respond to the initial HART Poll command The default number of retries is 3 The number of retries is specified in the Smart Transmitter Interface Parameter field of the header Placing hexadec
113. ription Expected Response Unique 38 bit device identifier revision levels number of preambles required 1 Read Primary Variable Primary variable in floating point IEEE 754 format 2 Read Primary Variable Current and Percent of Range Primary variable in milliamperes and 3 Read Dynamic Variables and Primary Variable Current 6 Write Polling Address Assigned polling address short form 11 Read Unique Identifier Associated with Unique 38 bit device identifier revision Tag levels number of preambles required Byte Count Primary variable and up to 4 predefined dynamic variables This one byte field indicates the number of bytes to follow this field excluding the check byte Valid values are 0 to 113 Insert the number of bytes required for this packet before transmitting it HART Response and Burst Data Packets 4 Communicating with the Smart Transmitter Interface Data This field specifies a number of data bytes associated with the command number given in the command field Set the number of data bytes to the appropriate value for the command in question The valid range is from 0 to 113 Only use this field when you are writing data to the HART device Check Byte The Smart Transmitter Interface calculates the value of this field and transmits it to the field device as the last byte of a packet The field device verifies the integrity of the received data packet by checking this byte
114. rotocol and a description of the different system architectures which can be implemented It also describes the features and benefits of using the Smart Transmitter Interface and lists some of the products that are compatible with the 1770 HT1 1770 HTS8 and 1770 HT16 The Smart Transmitter Interface products provide a communication interface between Allen Bradley PLC controllers or host computers and HART field devices transmitters transducers and actuators These products give host processors access to the digital information encoded with the 4 20 mA analog process control signal The digital information can be passed to and from the host processor using either a remote I O RIO or an RS 232C port A Smart Transmitter Interface consists of one Communications Controller 1770 HT1 and one or more Terminal Blocks 1770 HT8 or 1770 HT16 These products can be mounted on a DIN rail in a control cabinet and the field wiring brought directly to the Terminal Blocks 1770 HT1 Communications Controller The 1770 HT1 Communications Controller receives commands from a host processor and passes them on via the 1770 HT8 16 Terminal Blocks to HART field devices Responses from the HART field devices go through the Terminal Blocks to the Communications Controller and then on to the host processor The Communications Controller communicates through its Remote I O or RS 232C port to the host processor The combination of hardware and software used by
115. s a major fault Return the Communications Controller for servicing Flash EPROM Fault The checksum stored in the Flash EPROM does not match the actual checksum for it This indicates bad cells in the Flash EPROM This is a major fault Return the Communications Controller for servicing RAM Fault The static RAM cannot be reliably written to This is a major fault Return the Communications Controller for servicing Stuck Button Detected One or more push buttons are stuck on This could be caused by a mechanical problem with the buttons or by an object pressing on the push buttons If the cause is mechanical the Communications Controller should be returned for servicing Otherwise remove the pressure from the push buttons to clear the fault condition The Communications Controller will continue to communicate when this fault is detected but configuration will not be possible Flash EPROM Write Fault The Flash EPROM could not be burned correctly during download of new firmware This is a major fault Return the Communications Controller for servicing Serial EEPROM Major Fault The Smart Transmitter Interface was unable to write the new configuration to the EEPROM This is a major fault Return the Communications Controller for servicing Serial EEPROM Minor Fault On power up the Smart Transmitter Interface detected invalid configuration data in the EEPROM The Smart Transmitter Interface
116. s field to hexadecimal 80 for a primary master or hexadecimal 00 for a secondary master On a multi drop link set this field to a value in the range hexadecimal 80 to hexadecimal 8F for a primary master and hexadecimal 00 to hexadecimal OF for a secondary master Long Frame Address Field This five byte field contains two bit fields the master address bit and a 38 bit device address The master address bit is defined as for short frame address fields Figure 4 5 illustrates the format of the 38 bit device address Use HART Command 0 and short frame addressing as illustrated in the programmable controller programming example later in this chapter to determine this address 4 7 4 Communicating with the Smart Transmitter Interface Figure 4 5 Unique 38 Bit Device Identifier Bit M 15 RENE Manufacturer s Device ID Device Type 90073 Manufacturer HART Command This one byte field specifies the HART command that is to be sent by the Smart Transmitter Interface to the field device Many commands are device dependent Table 4 B lists some universal commands supported by all field devices Consult the documentation provided with the device for details Set this field to a device recognizable command before sending the packet to the Smart Transmitter Interface Table 4 B Representative HART Universal Commands Universal Command Decimal 0 Read Unique Identifier Desc
117. s specifications conform to HART Field Communications protocol Method of communication Frequency Shift Keying FSK Bell 202 Modem Standard with respect to baud rate and digital 1 and 0 frequencies Baud rate 1200 bps Digital 0 frequency 2200 Hz Digital 1 frequency 1200 Hz Data byte structure 1 start bit 8 data bits 1 odd parity bit stop bit Maximum multidropped devices 15 Maximum process variable per smart device 256 Maximum communication masters 2 A 5 Appendix Product Specifications Figure A 1 Loop Power Selection vw Indicates Analog I O 24 32 VDC Direction Module Power CH2 Supply 0 00 1770 8 RTN 0 25A WA 1770 HT16 _ 0 50A 0 Coupling E Capacitors Interface to Transceiver E 2 E o EID Circuitry of JP1 5 2 5 2 1770 1 8 25 285 Sit eas Though not indicated all shield connections are connected to each other Power Supply 00 4 2 Wire HART Field Device A 6 4 Wire HART Field Device 4 00 _ 90024 Diagnostic Command Support DF1 Diagnostic Command Support The information in this appendix deals only with RS 232C DF1 communications betwe
118. s supported are 300 600 1200 2400 4800 9600 and 19200 Cables Cabling for the RS 232C connector of the Communications Controller will vary depending on your application Use Belden 8723 or equivalent cable to construct a cable to connect the Communications Controller to a computer Important The length must not exceed 50 feet and the cable shield must be connected to chassis ground using Pin 1 at the Communications Controller end only If the length required exceeds 50 feet a modem or line driver must be used In addition if multiple Communications Controllers are connected to the host processor modems must be used to isolate the signals Activity Indicator The green LED RS 232 indicator located to the upper left of the black cover on the 1770 HT1 see Figure 1 1 flickers when the Communications Controller is receiving data over the RS 232C interface Connector and Pinout The RS 232C interface connector at the Communications Controller end is a DB 25 male connector with the following EIA Electronics Industries Association pinout Chapter 2 Installing the Smart Transmitter Interface Products Table 2 A RS 232C Connector Pinouts Signal Abbreviation JO Direction Pin Number Meaning Chassis Ground N A 1 The cable shield must be connected to chassis ground at one end only It is recommended that you do this at the Communications Controller end Transmit Data TXD 0 Output 2 RS 232C serialized
119. set at D9 00 Short Frame Format for HART Command 0 0110 0000 0000 Short Frame Word Contents Programmable Controller to Smart Transmitter Interface Offset at D9 00 Address D9 00 Word 00 Smart Transmitter Interface command hexadecimal 10 low byte Smart Transmitter Interface channel hexadecimal 01 high byte 4 Communicating with the Smart Transmitter Interface Word 01 Smart Transmitter Interface control hexadecimal 00 indicating a response is required from the Smart Transmitter Interface low byte Smart Transmitter Interface parameter hexadecimal 00 high byte Word 02 HART delimiter hexadecimal 02 indicating an STX frame with a short frame address low byte HART short frame address hexadecimal 80 indicating primary master and logical and slave addresses 0 high byte Word 03 HART command hexadecimal 00 low byte HART packet byte count of hexadecimal 00 high byte Word 04 HART packet check byte set to 0 low byte zero padding high byte Table 4 N Smart Transmitter Interface to Programmable Controller BTR Data Short Frame Format for Response to Hart Command 0 Octal Bits 17 16 15 14 18 12 11 10 07 06 05 04 03 02 01 00 Decimal Bits 15 14 18 12 11 10 09 08 07 06 05 04 03 02 01 00 Word 00 Smart Transmitter In
120. ssed simultaneously Before configuring the Communications Controller you should determine the parameters settings your network requires If they differ from the factory defaults shown in Table 3 B and Table 3 C use the following procedure to change them While you are changing the parameters in configuration mode the Communications Controller continues to communicate over its ports The changed parameter settings do not take effect until they are saved and the Communications Controller returns to run mode Enter Configuration Mode 1 Press the VIEW button to enter configuration mode The first parameter number is displayed on the left display with its current setting in the right two displays 3 3 Chapter 3 Configuring the Communications Controller 3 4 Configure Basic Parameters 2 Each time you press the VIEW button the parameter number in the left display advances and the parameter s current setting appears in the right display Press the VIEW button as often as necessary or hold it down until the desired parameter is reached Once the desired parameter is displayed press the DATA button to cycle through the available settings When you have reached the desired data setting you can press VIEW to display the next parameter and its current setting or go to step 7 to save the change and exit configuration mode Repeat steps 2 through 4 until the basic parameter settings meet your requirements Confi
121. t Monitor Mode scan list 1 channel in Burst Monitor Mode scan list Bit 1 0 last attempt to poll field device was successful 1 last attempt to poll field device including retries failed Bits 2 7 reserved 2 Reserved and set to 0 3 Number of preambles for channel 4 Number of retries for channel 5 6 Number of messages transmitted on this channel including retries Byte 5 low byte Byte 6 high byte 7 8 Number of messages received on this channel Byte 7 low byte Byte 8 high byte 9 10 Number of time outs on this channel Byte 9 low byte Byte 10 high byte 11 12 Number of invalid messages received on this channel Byte 11 low byte Byte 12 high byte 13 14 Reserved 15 16 Reserved 4 23 4 Communicating with the Smart Transmitter Interface Table 4 1 Response to Read Module Status and Statistics Byte 1 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 42 4 24 Description Smart Transmitter Interface Status Bits 0 1 Smart Transmitter Interface Mode 00 Poll and Response Mode 01 Burst Monitor Mode 10 Reserved 11 Reserved Bit 2 RAM Test 0 passed 1 failed Bit 3 ROM Test 0 passed 1 failed Bits 4 7 Reserved Reserved Device communication status with 1 bit per channel 0 last attempt to poll field device was successful 1 last attempt to poll field device including retries failed Byte 3 Bit 7 Channel 32 Bit 0
122. t Transmitter Interface station address in hexadecimal SRC host station address in hexadecimal CMD OF hexadecimal STS Status byte TNS transaction number 2 bytes FNC 95 hexadecimal LEN length of Smart Transmitter Interface Packet in bytes SCMD Smart Transmitter Interface Command CHN Smart Transmitter Interface Channel CTL Smart Transmitter Interface Control PRM Smart Transmitter Interface Parameter ETX end of text control character 04 hex BCC CRC Block Check or CRC bytes 9007 4 37 4 Communicating with the Smart Transmitter Interface Figure 4 14 Example Full Duplex DF1 Command Enable Poll and Response Mode DLE STX DST SRC CMD STS TNS FNC LEN Smart Transmitter Interface DLE ETX BCC Packet w ee Figure 4 15 Half Duplex DF1 Packet sent by a Host Computer to the Smart Transmitter Interface Smart Transmitter SCMD CHN CTL PRM DATA Interface Packet CMD STS TNS FNC LEN DATA Data Link Layer Packet DLE SOH STN DLE STX DST SRC APPLICATION DATA DLE ETX BCC CRC Since message is from host to Smart Transmitter Interface DLE data link escape control character 10 hex SOH start of header control character 01 hex STN Smart Transmitter Interface station address in hexadecimal STX start of text control character 02 hex DST Smart Transmittter Int
123. t packet The command cannot be processed Device Errors 20 Burst Mode Device The Smart Transmitter Interface is not receiving burst data Not from a field device in burst mode Either Burst mode has been Communicating turned off in the field device or it is too busy to send burst table data The error code is cleared once the Smart Transmitter Interface receives new burst data from the device 21 No Response The Smart Transmitter Interface has not received a response Received From from a field device after exhausting all retry attempts Device 22 No Valid Burst The Smart Transmitter Interface does not have data in its Data Burst Monitor Table for the requested channel Either the Smart Transmitter Interface was not commanded to monitor the channel for burst data or the field device is not in burst mode 4 18 Valid Smart Transmitter Interface Commands and Responses 4 Communicating with the Smart Transmitter Interface Smart Transmitter Interface Data Certain Smart Transmitter Interface commands require this extended data field to provide additional data to the host processor When not required this field is not sent by the Smart Transmitter Interface Table 4 G summarizes the valid combinations of Smart Transmitter Interface commands you can send via the programmable controller or host computer to the Smart Transmitter Interface Table 4 G Valid Command Combinations Command Smart Smart Smart S
124. terface Channel Number Smart Transmitter Interface Command Word 01 Smart Transmitter Interface Status Smart Transmitter Interface Error Code Word 02 HART Address HART Delimiter Mas Bur Logical Slave Address Lng 0 0 0 0 Frame Type Adr Address Frm Word 03 Byte Count HART Command Word 04 HART Response Code Second Byte Count First Byte Word 05 Manufacturer Identification 1 1 1 1 1 1 1 0 Code Word 06 Number of Manufacturer s Device Preambles Type Code Word 07 Transmitter Specific Universal Command Revision Revision Word 08 Hardware Software Revision Revision Word 09 Device ID Flags Most Significant Byte Word 10 Device ID Device ID Least Significant Byte Middle Byte Word 11 0 Check Byte 4 29 4 Communicating with the Smart Transmitter Interface Table 4 0 Example BTR Data Offset at D9 40 Short Frame Format for HART Command 0 Address D9 40 D9 50 Short Frame Word Contents Smart Transmitter Interface to Programmable Controller Offset at D9 40 a Word 00 Smart Transmitter Interface command is hexadecimal 10 low byte Smart Transmitter Interface channel is hexadecimal 01 high byte Word 01 Smart Transmitter Interface error code is hexadecimal 00 indicating no errors low byte Smart Transmitter Interface status is hexadecimal 80 indicating the Smart Transmitter Interface has been reset high byte Word 02 HART delimiter is hex
125. terfaces directly to a PLC 5 Remote I O Port in scanner mode along with other I O racks In addition the Smart Transmitter Interface can also be connected to other remote I O scanner modules such as the 1771 SN I O Subscanner module For details about which programmable controllers support the pass through feature contact your representative HART Field Devices ABB Kent Taylor K SC ABB Kent Taylor K ST 1 12 Chapter 1 Introducing the Smart Transmitter Interface Fischer amp Porter 5 0XM1000B Micro Motion RFT9739 Moore Products 340B Princo 50PL4610 Rochester Instrument System SC 6500 Rosemount 1151S 1 Rosemount 3001C Rosemount 3001S Rosemount 3044C Rosemount 3051C Rosemount 8712C Rosemount 8800 Rosemount 9712 Rosemount Analytical 2054pH Smar LD301 Analog I O Devices 1771 1 05 1771 IF 1771 IFE Hand Held Terminal Rosemount Model 268 Smart Family Interface 1 13 Chapter 1 Introducing the Smart Transmitter Interface Figure 1 10 A Typical Network Host Computer 1770 HT1 TT Lj 1771 ASB RIO Adapter 1771 IFE HART Field Devices 1770 HT8 Point to point 1771 IFE Modules 1770 HT16 1770 HT8 Cable Multidrop max gt 10000 ft 90027 Before You Begin Installing the Smart Transmitter Interface Products This chapter explains h
126. the label on top of the unit In the lower left hand corner of the label is a section entitled Notes This lists the parameter number OPTN for the main menu and sub menu options and provides space for the current settings DATA Mark these in with a pencil so they can be changed if the configuration changes See Figure 1 1 Data Routing and Protocol Conversion Communicating with the Smart Transmitter Interface This chapter provides programming information for communication between host processors programmable controllers and host computers and HART field devices via the Smart Transmitter Interface It includes explanations of the data routing and protocol conversion functions of the Smart Transmitter Interface definitions of relevant communication terms descriptions of HART and Smart Transmitter Interface data packets aPLC 5 programming example that illustrates the use of these packets for communicating between programmable controllers and HART field devices an explanation of serial communications with the Smart Transmitter Interface a brief note on using Data Highway Plus hosts with the Smart Transmitter Interface The Smart Transmitter Interface routes data packets between host processors and HART field devices as illustrated in Figure 4 1 Programmable controllers send and receive Smart Transmitter Interface packets on the RIO link Host computers send and receive DF1 packets on the RS 232C link The Smart
127. the phone is off hook Data will not be received by the Communications Controller unless DCD is on With full duplex protocol the Communications Controller will not transmit unless DCD is on If the modem does not control DCD properly DCD must be jumpered to DTR at the module Data Terminal DTR 0 Output 20 A signal from the Communications Controller to the modem to connect to Ready the phone line i e pick up the phone The Communications Controller will assert DTR all the time except during the phone hang up sequence Modems built to North American standards will not respond to DTR until the phone rings The Communications Controller will not work correctly with modems which always pick up the phone upon receiving DTR whether the phone is ringing or not The connector you use at the computer end of the cable depends on whether or not your application makes use of handshake signals whether or not you are connecting to a 9 pin serial port for an IBM AT and whether or not your computer uses standard IBM pinouts The following diagrams Figure 2 21 through Figure 2 26 are for IBM computers with either 9 or 25 pin connectors If your computer has a different pinout construct a cable using the appropriate signal names for your computer If you are not using handshake signals use the three wire connections shown in Figure 2 21 or Figure 2 22 2 25 Chapter 2 Installing the Smart Transmitter Interface Products 2
128. tions Using Programmable Controller Pass through Data can also be sent to and received from HART field devices using the pass through feature of the programmable controller to initiate Block Transfer Reads and Writes BTR and BTW No dedicated programmable controller ladder logic programs are required when the pass through feature is used A host computer on the DH network running programs with pass through support can be used to communicate with the HART field devices Figure 1 5 Smart Transmitter Interface with DH Host Using Pass through THIRD PARTY SOFTWARE Programmable 2 Controller with MEE HART LSE Nau Pass through T it Field Feature SO ee Devices Interface 90033 The RS 232C Port of the Communications Controller The RS 232C port on the Communications Controller allows the HART field devices to communicate with either a local host or via modem a remote host Chapter 1 Introducing the Smart Transmitter Interface HOST COMPUTER RS 232 CABLE 222 Full Duplex Communications With DF1 full duplex systems you can communicate directly to a single Smart Transmitter Interface No programmable controllers are necessary just a computer running the appropriate software the HART field devices and the Smart Transmitter Interface between them The host computer and the Smart Transmitter Interface should be connected with either an RS 232 cable
129. ud rate Allen Bradley RIO Terminal Block 1770 HT8 16 Interface supports 32 multiplexed HART 4 20 mA current loops Phoenix COMBICON header and plug 17 position 12 24 AWG maximum 1000 ft 304 8 m standard shielded cable with 8 twisted pairs Belden 9508 or Belden 85168 24 VDC differential channel select differential transmit enable differential half duplex HART transmit receive HART Master Device Revision 7 1 HART Physical Layer Specification Revision 7 0 HART Data Link Layer Specification Appendix Product Specifications Electrical DC Input Voltage Fuse Connector Power Consumption Physical Dimensions 24 VDC 1 600 mA maximum load UL 198G and CSA 22 2 No 59 rated 5mm x 20mm 1 0 Amp 250V fast acting Phoenix COMBICON header and plug 3 position 12 24 AWG 4 8 watts maximum 4 3 10 9 cm wide x 14 0 35 6 cm long x 2 7 6 9 cm high Weight Mounting Environmental Operating temperature Storage temperature Operating humidity 8 Channel Terminal Block 1770 HT1 Interface 1770 HT8 Connector 1 8 Ib 0 8 kg approximate DIN rail EN 50 022 or EN 50 035 0 C to 60 C 32 F to 140 F 40 C to 60 C 40 F to 140 F 5 to 95 non condensing Phoenix COMBICON header and plug 17 position 12 24 AWG Input 24 VDC differential channel select signals differential transmit enable differential half duplex HART transmit receive 4 20 mA Curr
130. ult to implement Figure 4 11 Full Duplex Network Programmable Controller or Host Computer RS 232C Link Smart Transmitter Interface Hart Field Devices 90036 Half Duplex Half duplex protocol isa protocol for one host processor and one or more field devices You must use modems if there is more than one Smart Transmitter Interface allows only one host processor or field device to transmit at any one time provides a less effective utilization of resources than full duplex but is easier to implement 4 35 4 Communicating with the Smart Transmitter Interface 4 36 Half duplex protocol can be used on a point to point link but more usually operates on a link with all nodes interfaced through half duplex modems There may be from 0 to 63 decimal nodes simultaneously connected to a single link Figure 4 12 Half Duplex Network Programmable Controller or Host Computer RS 232C Link RS 232C Link Hart Field Devices Hart Field Devices Hart Field Devices 90035 One node is designated as the master and controls which node has access to the link All other nodes are slaves and must wait for permission from the master before transmitting In the Smart Transmitter Interface network the host computer is the master and the Smart Transmitter Interface is the slave With half duplex protocol you can use atwo circuit system the master sends and slaves receive on o
131. ults Pressing the VIEW and DATA buttons simultaneously when in configuration mode resets all parameters in both menus to their factory defaults When this button combination is pressed the Communications Controller displays the first parameter and its factory default Like any other changes the factory default parameters are not saved until the VIEW and EXIT buttons are pressed simultaneously If only the EXIT button is pressed the Communications Controller returns to run mode without changing the parameters to their factory defaults For normal operation you must configure the basic communication parameters For special communication needs you can configure the advanced communication parameters which provide more flexibility in the RS 232C operation of the Communications Controller Basic Parameters The basic communication parameters are divided into two groups those that control the Remote I O link those that control the RS 232C link The parameter number is shown in the left display with the current setting in the two right displays Table 3 B describes each basic communication parameter and its valid settings Chapter 3 Configuring the Communications Controller Table 3 B Main Menu Basic Communication Parameters Parameter Parameter Description Factory Default Number RIO Parameters Defines the address of the rack containing the Communications Controller Valid choices are Programmable Logic Controller depe
132. um loop current r is the cable resistance per foot This formula was used to calculate the voltages required of power supplies for the Rosemount 3051 and 3044 with different cable lengths and wire gauge The 3051 requires 10 5 volts and the 3044 requires 12 5 C 5 Appendix Cable Length and Power Supply Requirements Table C A Typical Supply Voltages Cable Length ft Supply Voltage AWG 3051 3044 24 0 24 3 24 0 24 2 24 8 24 1 24 5 25 4 24 2 24 7 25 9 24 7 26 0 29 0 25 6 28 1 1000 1500 2000 5000 10000 24 AWG is limited to 5000 feet by HART specifications Table C B Recommended Power Supplies Voltage Amperage Manufacturer Part Number 24 VDC 2 1 Amp Acopian A24MT210 3 5 5 Acpan AMMTS0 1 5 m Phoenix ELM CM 90 PS E VAC 24 DC 1 5 2 0 Amp Phoenix Contact CM 125 PS 110 230 VAC 24 DC 2 28 VDC 2 1 A28MT210 7 3 0 3 0Amp 30 VDC 2 1 NEU LN E M a 3 0 Amp Acopian A30MT300 Symbols Empty 2 1 A Address station 3 7 Advanced communication parameters 3 8 Analog signal 1 8 Basic communication parameters 3 6 Block Transfer Read 4 2 4 4 4 25 Block Transfer Write 4 2 4 4 4 25 Burst Data table 4 2 4 4 4 20 4 21 Burst Monitor mode 4 2 4 20 Byte count 4 8 4 11 C Chassis ground 2 24 Check byte 4 9 4 13 Clear to Send 2 2 Commands Diagnostic B 1 Diagnostic Counter Reset format B 3 D
133. ut is Signal Label Cable A1 1 Blue wire A2 SH Shield A3 2 Clear wire Use Twinaxial Cable 1770 CD for the RIO connections Maximum length for the cable depends on the baud rate For this baud rate Maximum cable length is 57600 10 000 feet 3 048 m 115200 5 000 feet 1 524 m 230400 2 500 feet 762 m Termination Terminate the farthest physical nodes on the RIO link with a 150 or 82 Ohm termination resistor If the Communications Controller is the last device on the RIO link connect a 1 2 watt resistor across pins 1 and 2 of the plug The value of the resistor depends on the Remote I O baud rate For this baud rate Use this terminating resistor Allen Bradley Part Number 57600 1500 740018 29 115200 1500 740018 29 230400 820 740018 23 2 23 Chapter 2 Installing the Smart Transmitter Interface Products Connecting the Communications Controller to the RS 232C Host 2 24 Activity Indicator If the RIO LED is The RIO link is Off Inactive On Active normal communication is in progress Flickering Communications established but not active A single full or half duplex RS 232C serial port using the DF1 protocol provides communications with the host processor This connector is located at the left end of the Communications Controller see Figure 1 1 The 1770 HT1 is configured as a DTE Data Terminal Equipment RS 232C Baud Rates Baud rate

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