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1. PC RUNNING NOTE EARTH GROUND PORT COMMONS ARE SHOWN CONNECTING VIA A THIRD MODBUS WIRE A CONNECTION TO EARTH GROUND SHOULD ALSO BE PROVIDED AT ONE POINT ALONG THE NETWORK THIS IS ACCEPTABLE FOR MODULES LOCATED IN APPLICATION CLOSE PROXIMITY ONE ANOTHER BUT RECOMMENDED FOR MODULES SOFTWARE DISTRIBUTED OVER LONG DISTANCES H PER EIA 485 STANDARD IT IS GOOD PRACTICE TO INSTEAD CONNECT PORT COMMON TO EARTH GROUND V A A 0 5W 100 OHM RESISTOR AT EACH POINT ALONG i SET BAUD RATE THE NETWORK PARTICULARLY FOR NETWORKS THAT PROVIDE MULTIPLE GROUND AND PARITY CONNECTIONS DISTRIBUTED OVER LONG DISTANCES RS232 PORT OPTIONAL 120 OHM PO ARO ORAL TERMINATION RESISTOR OTHER RS485 RS485 NETWORK HALF DUPLEX SEE NOTE REGARDING PORT COMMON AND EARTH GROUND CORNECREREY C I CONNECT CONNECT TO AC POWER cou co POWER co POWER ol aT Ta 1 y eleleleelere 22 2 eleele eee Djs SS hes Pl OOO ooococooo ee i r7 DIGITAL OUTPUTS DISTAL Sas ANY RS232 TO RS485 CONVERTER MODEL 924MB 0900 MODEL 906MB 0900 SET BAUD RATE PARITY SET BAUD RATE
2. A geleer eelere HUHUU DATAQ RUN 4845 gree el 2635 34333231 T RAIL DIN MOUNTI ODST TB UTUTy TBO oD DIBA 1 N N O O DIN EN 50022 35mm 4 4 3 2 0 J3 ns O pFT 68 DIGITAL OUTPUTS RS485 PWR 0 1 OO 9 OO 755 2 6 ane MODEL 918MB 0900 SHOWN bee MODEL 917MB 0900 SIMILAR AN S AN Q 5 2 5 TR N N NN I N N NN 9 o 117 12131415 18 2122 2324 25 28 L AAAAAA AA AA AR y T T T T 22 ae rovo Y I 1 05 gt n 3 90 26 7 be 99 1 4 35 gt 110 5 NOTE ALL DIMENSION ARE IN INCHES MILLIMETERS SERIES 917MB 918MB ENCLOSURE DIMENSIONS 4501 833 Block Diagrams and Schematics 44 Model 917MB 918MB Modbus RS485 Network I O Modules 8 Accessories Series DI 900MB Software Interface Package Model 100969 The Software Interface Package combines the DI 900MB Configuration Software RS 232 to RS 485 Serial Con verter Interface Cable and Instructions into a complete kit for interfacing with Series DI 900MB I O Modules DI 900MB Configuration amp Control Software Series DI 900MB modules are configured with this user friendly Windows 95 989 or NT Configuration Program Optionally any software that supports the Modbus RTU protocol may be used to configure and control Series DI 900MB modules but the use of this soft
3. For Help press F1 2 MODULE Note that 3 property sheets define this transmitter s configuration General Test and Output Calibration Module The Serial and Firmware numbers are indicated at the top of the General screen and cannot be modified Module Software Configuration 35 Model 917MB 918MB Modbus RS485 Network I O Modules For Tag enter up to 15 alphanumeric characters optional For Comment enter up to 31 alphanumeric characters optional For Configured By enter your name up to 15 alphanumeric characters optional You can also add a Location note of up to 25 alphanumeric characters optional For Channel ID enter up to 15 alphanumeric characters of identification information relative to the output channel optional Use the Slave Address scroll bar to select a new module address that will take effect following download Select from 1 to 247 Address 247 is reserved for Default Mode Use the Baud Rate scroll bar to select a new baud rate to be used by the module following download Select 2400 4800 9600 Default Mode 14400 19200 28800 38400 57600 76800 or 115200 bits per second Use the Parity scroll bar to select Odd Even or No Parity Default Mode error checking by the module Use the Response Delay field to specify a delay from 0 to 65500 ticks with 1 tick equal to 1 085 micro seconds Response delay is the additional turnaroun
4. Electrical Connections Analog output digital output and network amp power terminals can accommodate wire from 12 24 AWG stranded or solid copper Strip back wire insulation 4 inch on each lead before installing into the terminal block Analog output wiring should be shielded twisted pair Since common mode voltages can exist on signal wiring adequate wire insu lation should be used and proper wiring practices followed It is recommended that analog output wiring digital out put wiring network wiring and power wiring be separated from each other for safety as well as for low noise pickup Note that terminal blocks are a plug in type and can be easily removed to facilitate module removal or replacement without removing individual wires Be sure to remove power before unplugging the terminals to uninstall the mod ule or before attempting service All connections must be made with power removed CAUTION Risk of Electric Shock More than one disconnect switch may be required to de energize the equipment before servicing 1 Power Refer to Drawing Electrical Connections 4501 831 Variations in power supply voltage within rated limits has negligible effect on module accuracy For supply connections use No 14 AWG wires rated for at least 75 C The power terminals are diode bridge coupled and not polarized The unit is powered from 10 36VDC or 24VAC 2 Analog Outputs Connect outputs per Drawing Electrical Connect
5. Interface Standard Command Response Protocol Baud Rate Duplex Parity Stop Bits Response Delay Module Address Network Capacity Communication Distance Default Communication Mode Parameters RS 485 Communication with this module is made over a 3 wire cable D D bar and Common Standard Modbus RTU protocol implemented as defined under Modicon Modbus Reference Guide PI MBUS 300 Rev J reference www public modi con com search keyword PI MBUS 300 to obtain technical publication See 4 Module Configuration for a review of Modbus amp commands Can be programmed for 2400 4800 9600 Default Mode 14400 19200 28800 38400 57600 76800 or 115200 bits per second Half Duplex only Odd Even or None Default Mode 1 stop bit for even odd parity 2 stop bits w no parity The minimum communication turnaround delay that a module will wait before it sends its response to a message from the host It is applied in addition to the inherent delay already present which varies between models It can be set from 0 65500 ticks with 1 tick equivalent to 1 085us Some signal converters or host software systems cannot accept an immediate response from the slave without additional delay Note that you may have to specify an amount of delay that is comparable to the inherent delay already present before an effect can be measured Can be set from 0 247 01 H F7H The Default Mode address is 247 F7H The
6. esee 11 3 Getting Started nennt nne nube eae oo ERU Ree 13 Unpacking and Inspection te 13 Module Installations e e ee ere Sor reed eto epe Tee ES 13 Detault Mode S witcli eret reete toten a e tah NOS e ETE beth PUTA Ere 14 MoO fntinig i 14 Blectrical Connections 74 ccs ec eeclesiae ed mentre 14 Software Installation Using Setup exe esses enne nennen eerie nennen 15 4 Mod le ConfIgUratiOn 55 lt cessssccscsssccsoctssosccsesssseoscsosesesctseseescsesesscteoonsessenesebcoosesstanssenecsseceseesebssesseveseosess 17 17 Module imu ania eae ae 21 5 An Introduction to Modbus Lush Duo Rob aps ERN DNUS ave Coria R Fa 23 Remote Terminal Unt RTU iret eee itn dne eee eter i bete eben eee een eon eg 23 Modbus Message Framing cian teal t aee den ea ne ce a cede 23 How Characters Are Transmitted Serially eese nennen 24 Modbus Addresses eee Hp ttt de eiie editi deos 24 Modbus FEutictiotis ecce sec eorr reete ode eret e Donee deve ee vO e Pda naa eee EE Pe e PARTES 24 Read Coil Status 01 ERE 25 Read Holding Registers 03 eiiis uie tect
7. Current shown below assumes that all outputs are ON LED s ON the module is connected to the network and module is in the default mode The power terminals are diode coupled and are not polarized Caution Do not exceed 36VDC peak to avoid damage to the module The DI 917MB current in the table below assumes that all four current outputs are delivering 20mA Note the DI 917MB maximum ambient is derated to 50 for supply voltages less than 15V DI 917MB Supply Current Supply DI 917MB 10V Not Recommended 12V 256mA Typical 275mA Maximum 15V 183mA Typical 200mA Maximum 24V 108mA Typical 120mA Maximum 36V 75mA Typical 80mA Maximum 24VAC 190mA rms Typical 210mA rms Maximum The DI 918MB current in the table below assumes that all four voltage outputs are driving 10V into 1OKQ DI 918MB Supply Current Supply DI 918MB 10V 125mA Typical 140mA Maximum 12V 100mA Typical 115mA Maximum 15V 80mA Typical 90mA Maximum 24V 52mA Typical 60mA Maximum 36V 40mA Typical 45mA Maximum 24VAC 96mA rms Typical 105mA rms Maximum Power Supply Effect Volts 60 120 Hz Ripple Isolation Installation Category Radiated Field Immunity Electromagnetic Interference Immunity EMI Less than 0 001 of output span change per volt for rated power supply vari ations Less than
8. 20000 0 and 20000 respectively Read Input Registers 04 This command will read the binary contents of input registers 3x reference addresses in the slave device Broadcast transmission is not supported The Read Input Registers query specifies the starting register and quantity of registers to be read Note that registers are addressed starting at 0 registers 1 16 are addressed as 0 15 The Read Input Registers response message is packed as two bytes per register with the binary contents right justi fied in each byte For each register the first byte contains the high order bits and the second byte the low order bits The following example reads input register 30001 module status at slave device 247 Read Input Register Example Query Read Input Register Example Response Field Name Example Field Name Example Value Value Hex Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 4 04 Function Code 4 04 Starting Address High Order 0 00 Byte Count 6 06 Starting Address Low Order 2 02 Data High Register 30003 0 00 Number Of Points High Order 0 00 Data Low Register 30003 80 50 Number Of Points Low Order 2 02 Data High Register 30004 0 00 Error Check CRC Data Low Register 30004 128 80 Error Check CRC To summarize the contents of register 30001 two bytes is the status value of zero 0000H
9. E E ay POWER IMPORTANT OBSERVE PROPER POLARITY PGUP Da EEEE BEE SESS oo d 4 0 35VDC SHIELDED CABLE 6 8 88 e as DIGITAL OUTPUTS RS485 PWR SC DIODE Q J ouro S our a lt lo z outz MODEL 918MB 0900 SHOWN S ours MODEL 917MB 0900 SIMILAR S RTN TYPICAL DIN RAIL MOUNTED RELAY IN DE ENERGIZED CONDITION EARTH GROUND EARTH GROUND EINE Y NOTE ALL RELAY CONTACTS SHOWN SEE NOTE F GEE NOTEI OUTPUTS WITHA ANALOG OUTPUTS ANALOG OUTPUTS rFiSEELEE ais ESEE m om oco cor gt NOTE 1 RETURNS SHOULD BE CONNECTED TO EARTH GROUND 11 12 13 14 15 16 Z1 22 23 24 25 26 AT THE SAME POINT TO AVOID CIRCULATING GROUND CURRENTS NOTE 2 DIODE ADDED LOCAL TO INDUCTIVE LOAD TO SHUNT THE RARRAR AAAAAA mu REVERSE EMF THAT IS GENERATED WHEN CURRENT THROUGH 2 THE INDUCTOR RELAY COIL IS TURNED OFF leleleeleo SHIELDED CABLE f d INPUT CONNECTIONS SEE DRAWING 4501 831 4501 832A Block Diagrams and Schematics 43 Model 917MB 918MB Modbus RS485 Network I O Modules Enclosure Dimensions 4501 833
10. Make sure that the correct baud rate is selected for the RS232 to RS485 converter employed The unit routinely performs inter nal diagnostics following power up or reset During this period the green LED flashes If the diagnostics complete successfully the LED will stop flashing after two seconds and remain ON This indicates that the unit is operating normally If the LED continues to flash then this is indicative of a problem In this case use the Modbus Configuration Software to reconfigure the module and this will usually cure the problem If the diagnostics continue to indicate a problem a continuously flashing green LED or if other evidence points to a problem with the unit an effective and convenient fault diagnosis method is to exchange the questionable module with a known good unit DATAQ Instruments Application Engineers can provide further technical assistance if required When needed complete repair services are available from DATAQ Instruments Inc Safety Summary Means Caution refer to this manual for additional information IMPORTANT SAFETY CONSIDERATIONS It is very important for the user to consider the possible adverse effects of power wiring component sensor or software failures in designing any type of control or monitoring system This is especially important where economic property loss or human life is involved It is important that the user employ satisfactor
11. i e no EEPROM or flash checksum errors present Force Single Coil 05 This command will force a single coil output ox reference address ON or OFF For broadcast transmission this function forces the same coil in all networked slaves The Force Single Coil query specifies the coil reference address to be forced and the state to force it to The ON OFF state is indicated via a constant in the query data field A value of FFOOH forces the coil to be turned ON i e An Introduction to Modbus Model 917MB 918MB Modbus RS485 Network I O Modules the gate of the corresponding n channel mosfet is set high and 0000H forces the coil to be turned OFF i e the gate of the corresponding output mosfet is set low All other values are illegal and will not affect the coil Note that coils are referenced starting at 0 to 4 coils are addressed as 0 3 for this model and this corresponds to the discrete output channel number The following example forces discrete output 3 ON at slave device 247 Force Single Coil Example Query Force Single Coil Example Response Field Name Example Field Name Example Value Hex Value Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 5 05 Function Code 5 05 Coil Address High Order 0 00 Coil Address High Order 0 00 Coil Address Low Order 3 03 Coil Address Low Order 3 03 Force Data High Order 255 FF Force Data High Order 255 FF
12. rail 35mm Removable plug in type terminal blocks Current Voltage Ratings 15A 300V Wire Range AWG 12 24 stranded or solid copper separate terminal blocks are provided for analog outputs discrete outputs and power amp network For supply connections use No 14 AWG copper wires rated for at least 75 C Self extinguishing NYLON type 6 6 polyamide thermoplastic UL94 V 2 color beige general purpose NEMA Type 1 enclosure Military grade FR 4 epoxy glass 1 pound 0 45 Kg packed Agency Approvals Pending CE UL Listed and cUL Listed UL3121 First Edition CSA C22 2 No 1010 1 92 Low Voltage Directive 72 23 EEC EMC 89 336 EEC Directives Product approval is limited to general safety requirements of the above stan dards Warning This product is NOT approved for hazardous location applications Environmental Specifications Operating Temperature Storage Temperature Relative Humidity DI 917MB 25 C to 60 C 13 F to 140 limit DI 917MB ambient to 50 maximum for supply voltages less than 15V DI 918MB 25 to 70 C 13 F to 158 40 C to 85 C 40 F to 185 F 5 to 95 non condensing Specifications 6 Model 917MB 918MB Modbus RS485 Network I O Modules Power Requirements Non polarized 12 36V DC SELV Safety Extra Low Voltage or 22 26 VAC Current draw is a function of supply voltage and model number see Supply Current Tables below
13. the four lower order bits of this register value define the timeout states of each of the output channels Writing 65535 FFFFH to the output channel Timeout States register will leave the port outputs unchanged upon timeout Use the Timeout Value registers to set a level that the corresponding analog output is to be programmed to following a watchdog timeout Write 65535 FFFFH to this register to leave the analog outputs unchanged following a timeout Watchdog timeout state or level control takes precedence over direct control of the output channels of this model The output watchdog timer is reinitiated via a read or write to any output channel DI 917MB Select DC current output ranges 4 20mA 0 20mA 0 1mA DI 918MB Select DC voltage output ranges 0 10V 0 5V or 0 1V DC Outputs use percent of span units with 20000 representing 100 see Units below The value that the corresponding analog output will be automatically pro grammed to following a watchdog timer timeout This value must be within the programmed output range Write 32767 7FFFH to leave the output unchanged following a watchdog timeout The configuration software can be used to calibrate the output circuit of this module see Output Calibration or by using the Preset Register Functions to write the appropriate data to the calibration registers see Register Map Specifications 10 Model 917MB 918MB Modbus RS485 Network I O Modules Output Units Anal
14. 0 01 of output span per volt peak to peak of power supply ripple Output network and power circuits are isolated from each other for common mode voltages up to 250VAC or 354V DC off DC power ground on a contin uous basis will withstand 1500VAC dielectric strength test for one minute without breakdown This complies with test requirements of ANSI ISA 82 01 1988 for the voltage rating specified Designed to operate in an Installation Category Overvoltage Category II environment per IEC 1010 1 1990 Designed to comply with IEC1000 4 3 Level 3 10V M 80 to 10000MHz AM amp 900MHz keyed and European Norm EN50082 1 No output shifts will occur beyond 0 25 of span under the influence of EMI from switching solenoids commutator motors and drill motors Specifications 7 Model 917MB 918MB Modbus RS485 Network I O Modules Electrical Fast Transient Immunity EFT Electrostatic Discharge ESD Immunity Surge Immunity Radiated Emissions Complies with IEC1000 4 4 Level 3 2KV power 1KV signal lines and Euro pean Norm EN50082 1 Complies with IEC1000 4 2 Level 3 SKV AKV air direct discharge to the enclosure port and European Norm EN50082 1 Complies with IEC1000 4 5 Level 3 2 0KV and European Norm EN50082 1 Designed to comply with European Norm EN50081 1 for class B equipment Communication Interface Specifications These units contain an isolated RS485 communication port for the transmission of data
15. 0000 puts 0 3 Program that controls monitors the ON OFF status for the output 00004 0003 States A set bit 1 means the corresponding output is ON A clear bit 0 means the corresponding output is OFF The bit position corre sponds to the output channel number i e output 0 uses bit 0 of the 16 bit word at address 0 output 1 uses bit 1 of the 16 bit word at address 1 etc Unused bits of a word are set to 0 Bits 15 4 Not Used Additionally unused bits in range 3 0 are set to 0 Note This signal corresponds to the gate signal of the n channel output mosfet Thus a read of this register may not reflect the actual output level at the drain of the mosfet if the open drain is not pulled up or is left floating no excitation Excitation must be provided in order to operate the outputs After reset these registers read 0 outputs OFF and these registers are not maintained in EEPROM Module Configuration 17 Model 917MB 918MB Modbus RS485 Network I O Modules Ref Addr Description Data Type Format Input Registers 3x References Read Only 30001 0 0000 Module Status Bit 15 Flash Checksum 1 Error Flag 0 No Flash Error Bit 14 Not Used Bit 13 Default Mode 1 Default Mode Indicator 0 Not In Default Mode Bits 12 1 Zero Bit 0 Watchdog Fault 1 Watchdog Timeout 0 Timeout Cleared 30002 1 0001 CH 0 Status Value Bit
16. Coils 3 0 10 0A Number Of Points High Order 0 00 Error Check CRC Number Of Points Low Order 4 04 Error Check CRC Note that the leading character of the Ox reference address is implied by the function code and omitted from the address specified In this example the first address is 00001 referenced via 0000H and corresponding to coil 0 To summarize the status of coils 3 0 is shown as the byte value hex or 00001010 binary Coil 3 is the fifth bit from the left of this byte and coil 0 is the LSB The four remaining bits toward the high order end are zero Read ing left to right the output status of coils 3 0 is ON OFF ON OFF This is summarized as follows Bin 0 0 0 0 1 0 1 0 0 3 2 1 0 Read Holding Registers 03 This command will read the binary contents of holding registers 4x reference addresses in the slave device Broad cast transmission is not supported The Read Holding Registers query specifies the starting register and quantity of registers to be read Note that regis ters are addressed starting at registers 1 16 are addressed as 0 15 The Read Holding Registers response message is packed as two bytes per register with the binary contents right justified in each byte For each register the first byte contains the high order bits and the second byte the low order bits An Introduction to Modbus 25 Model 917MB 91
17. DI 900MB Configuration Software to program and control the Model DI 918MB transmitter parame ters and operating modes This software is generally easy to use and self explanatory Complete configuration only takes a few minutes On line help is also built in and includes context sensitive help As such a comprehensive guide to the use of this program is not necessary However to begin configuration you should already be familiar with Windows operation and have a basic understanding of transmitter terminology as it relates to this model Before You Begin 1 Have you installed the DI 900MB Configuration Program If not then you should complete the Module Instal lation of this manual before proceeding 2 Check that all necessary electrical connections have been made and that power is applied module s green LED ON 3 Have you set the correct baud rate at the RS485 converter or repeater if used 4 Have you tried communicating using the Default Communication Mode Press the DFT push button of the DI 918MB module until the yellow status LED is flashing This sets the module s communication parameters to 9600 baud a slave address of 247 no parity and two stop bits Be sure to also set the baud rate of the RS485 converter or network repeater to 9600 baud 5 If you fail to communicate with the module or have a high degree of communication errors try increasing the response delay time See Response Delay Register 40010 Some network
18. Force Data Low Order 0 00 Force Data Low Order 0 00 Error Check CRC Error Check CRC The Force Single Coil response message is an echo of the query as shown above returned after executing the force coil command No response is returned to broadcast queries from a master device Preset Single Register 06 This command will preset a single holding register 4x reference addresses to a specific value Broadcast transmis sion is supported by this command and will act to preset the same register in all networked slaves The Preset Single Register query specifies the register reference address to be preset and the preset value Note that registers are addressed starting at 0 registers 1 16 are addressed as 0 15 The Preset Single Registers response message is an echo of the query returned after the register contents have been preset The following example writes a baud rate of 9600bps to holding register 40002 Baud Rate at slave device 247 Preset Holding Register Example Query Preset Holding Register Example Response Field Name Example Field Name Example Value Hex Value Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 6 06 Function Code 6 06 Register Address High Order 0 00 Register Address High Order 0 00 Register Address Low Order 1 01 Register Address Low Order 1 01 Preset Data High Order 0 00 Preset Data High Ord
19. PARITY AND ADDRESS AND ADDRESS CIC OMANI rdC C RENTRER DGA Ir Pu 2 EN TE goto 12a N 4567 11 12 13 14 15 16 21 22 23 24 25 26 P 1700 5 4800 AAAAAA HRRRRR RRRRRHR oje e 8 LT z s deur ae h 2 2 teteje TEDDDD D SET BAUD RATE 4501 805B Block Diagrams and Schematics 42 Model 917MB 918MB Modbus RS485 Network I O Modules Electrical Connections 4501 831 NOTE 1 THIS GROUND CONNECTION IS RECOMMENDED FOR BES
20. adjustments until the output is precisely equal to the High Calibration Value within 1 step Does the measured value match the High Calibration Value within 0 1 of output span If not then continue to tap the arrow keys slowly until it is within the acceptable error band Click on the High Calibrate button to set the High Calibration endpoint IMPORTANT On DI 917MB models all ranges are calibrated with the 0 20mA input range selected via Cali brate Enable or 0 10V on DI 918MB units If you are using any other input range you will need to reselect it from the General Page then download your configuration again after calibrating the outputs via this software For best results you should always calibrate the low value before the high value and allow the module to warmup a few minutes prior to calibration The 0 20mA and 0 1mA output ranges DI 917MB only may not go to precisely OMA The 0 20mA range will typ ically approach OmA to within 20uA As such it is necessary to use a non zero low calibration value instead of 0mA for these ranges In addition 0 1mA range resolution is poor Keep this in mind if you are using some other soft ware to accomplish calibration Module Software Configuration 40 Model 917MB 918MB Modbus RS485 Network I O Modules 7 Block Diagrams and Sche matics Theory of Operation Refer to Simplified Schematic 4501 828 and Functional Block Diagram 4501 829 to gain a better understanding
21. can enter a value from 0 to 20500 for the Model DI 917MB The Watchdog Timeout State 2 amp 3 property sheet is configured in the same fashion but applied to outputs 2 and 3 Module Software Configuration 37 Model 917MB 918MB Modbus RS485 Network I O Modules The next section covers testing of your module Use the Test page to check output operation and or monitor output states and levels Testin 9 Your Config uration if Series 900MB Configuration 917MB 0900 Untitled File Module Settings Help alk gt The Test portion of this program allows you to monitor polling monitor module sta tus flags restore factory calibration reset the General Watchdog Timeout State 0 amp 1 Watchdog Timeout State 2 amp 3 Test Output Cal module monitor output ranges and values Module Analog Qutput 0 Digital Output D and control or monitor output levels and Poling Status rar peer oit states Module Status Dutput Count 0 Wiite 9 ks en Analog Output E Digital Output 1 nalog Output 1 igi jutpul 1 0 Watchdog Dk Output Range 4 20m amp DC Test Operation _ Default Mode Yes Value 4000 T Digital Output Status Output Count 0 Write Un Click on the Test property sheet tab to test Digtal Output 0 Off Se ana the configuration just written to your module Digital Output 1 Off Output Range 4 20mADC and a screen similar to the one at t
22. clearing a timeout does not set the outputs to their pre timeout state they remain in their timeout state until otherwise written Before you can make changes to output timeout states or levels you must have already configured a watchdog time out value and have checked the Watchdog Reset box of the General property sheet as described on the previous page Use the Digital Output Watchdog Timeout Value scroll bar to select On or Off for the corresponding digital out put channel This defines the state the corresponding output will be programmed to following a watchdog timeout After a timeout is cleared the output remains in its current state until otherwise written Note that the digital output channels of this module are open drain mosfet low side switches On refers to an output that is sinking current Off refers to a switch that is not conducting Use the channel Analog Output Watchdog Timeout Value field to define the level the analog output is to assume following a watchdog timeout If you check the No Change check box just below this field the analog output will not be affected by a watchdog timeout Note that after a timeout is cleared the output remains at the current level until otherwise written Note that the analog output channels utilize percent of span units with 20000 representing 100 That is for the 4 20mA range a 0 indication 0 represents 4mA or 0mA for 0 20mA range and 100 20000 represents 20mA You
23. codes not supported by this model The master should request diagnostic info from the slave 08 Memory Parity Error The slave attempted to read extended memory but detected a parity error in memory The master can retry the request but service may be required at the slave device In a normal response the slave echoes the function code of the original query in the function field of the response function codes have their most significant bit msb set to O their values are below 80H In an exception response the slave sets the msb of the function code to 1 in the returned response i e exactly 80H higher than nor mal and returns the exception code in the data field This is used by the master s application to recognize an excep tion response and to direct an examination of the data field for the applicable exception code An Introduction to Modbus 32 Model 917MB 918MB Modbus RS485 Network I O Modules 6 Module Software Configura tion As shipped from the factory each module has a default configuration as detailed in the Module Installation section of this manual Your application will likely differ from the default configuration and the module will need to be recon figured Series DI 900MB modules may be easily configured and calibrated by simply issuing the appropriate Mod bus functions to the Register Map registers as required to configure the unit However it is much simpler to use the controls of the
24. following paragraphs summarize this model s output ranges and applicable specifications Current Output Specifications DI 917MB Only Output Ranges Select 0 20mA DC 4 20mA DC or 0 1mA DC Ranges are sub ranges of nominal 0 22 67mA design limit includes approximately 12 5 of over range Note The 0 20mA amp 0 1mA output ranges may not precisely go to the 0mA endpoint The 0 20mA range will typically approach OmA within 0 1 of span Output Maximum Current 22 67mA typical Output Accuracy See Table Analog Output Range Resolution amp Accuracy on page 5 Output Compliance 12V Minimum 13V Typical Specifications 3 Model 917MB 918MB Modbus RS485 Network I O Modules Output Load Resistance Range Response Time Output Resolution DAC Count Current 0 to 6250 typical 11ms typical into 500 for measurement to reach 98 of the final value in response to a step command Actual response time will vary with load 12 bits or 1 part in 4096 based 22 67mA full scale This is 5 535uA bit 22 67mA 4096bits See below for effective resolution calculations The internal DAC count can be calculated by multiplying the output current by 180680 The resultant value rounded can be used to calculate the effective resolution and to approximate the required output register program value see below Internal DAC Count Versus Current Output Range Range DAC 096 DAC 10096 DAC Span 0 1mA 0
25. mte cee ether Sarthe etude teet edente 35 Creating Configuration Elle siss adparet ed Re OE DM 35 Module iso RR ARS UR SUPE REA CAES CETTE SYM Een cata E Oe Pee ERRARE 35 Watchdog Timeout States V alues cei ettet rete pete teen teta ete bert 37 Testing Your Configuration a eee dete Do crede eel See eot 38 Test Operation ocr uertit ertt e e t e eit ep et tbe eee betta 38 Print Your Configuration 2 nete ere re chia dina 38 saving Your Configuration ei eae ees eee rH ee Pei eta aeta 39 Output Calibration eai d ee ene SA ee eris 39 Output Calibration Procedure sees e E 40 7 Block Diagrams and Schematics eee eee eee eee eee eene sten e etna e etta sotto setas ease seen see 41 Theoryof Operation i ie eser o eben iet obe er e en Eti P e t e pe et Lb Lee Moore iade 41 Simplified Schematic 4501 828 sse enne enne nest nennen 41 Functional Block Diagram 4501 829 tentent nnns 42 Network Connections 4501 805 42 Electrical Connections 4501 831 AT 43 Interposing Relay Conn amp Contact Pro 4501 832 sese 43 Enclosure Dimensions 4501 83
26. number of 1 bits For example if an RTU character frame contains the following eight data bits 1100 0011 then since the total number of 1 bits is 4 already an even number the frame s parity bit will be 0 if even parity is selected If odd parity is used then the parity bit will be set to 1 making the total number of bits an odd number five When a message is transmitted the parity bit is calculated and applied to the frame of each character transmitted The receiving device counts the quantity of 1 bits in the data portion of the frame and sets an error flag if the count differs from that sent As such parity checking can only detect an error if an odd number of bits are picked up or dropped off from a character frame during transmission For example if odd parity is employed and two 1 bits are dropped from a character the result is still an odd count of 1 bits Note that all devices on a Modbus network must use the same parity If no parity checking is selected then no parity bit is transmitted and no parity check is made An additional stop bit is transmitted to fill out the character frame for the no parity selection CRC Error Checking RTU Mode message frames include an error checking method that is based on a Cyclical Redundancy Check CRC The error checking field of a frame contains a 16 bit value two 8 bit bytes that contain the result of a Cyclical Redundancy Check CRC calculation performed on the message contents The C
27. of the circuit Note that this transmitter will drive up to four analog current plus four open drain digital outputs and provides network commands to configure the module plus monitor and control the outputs The microcontroller parses I O commands and sends output values to 12 bit Digital to Analog Converters at each output A correspond ing DAC output voltage is sent to a voltage to current converter circuit I O lines of the microcontroller also switch discrete outputs ON OFF as required The UART of the microcontroller sends receives its I O signals to the network via an optically isolated RS485 transceiver Embedded configuration and calibration parameters are stored in non volatile memory integrated within the micro controller Only the functions required by an application are actually stored in memory new functionality can be downloaded via the host running the Modbus Configuration Software or other compatible Modbus software along the network A wide input switching regulator isolated flyback mode pro vides isolated power to the various I O circuits Refer to Functional Block Diagram 4501 829 for an overview of how the software configuration variables are arranged Simplified Schematic 4501 828 OUTPUT STATUS gt 10 36V DC cm POWER D PWR LED _ ISOLATED FLYBACK STATUS LED QD 4 ISOLATED POWER OuTPWR Le RS485 PWR w
28. or power on reset of the module Outputs may be optionally sent to user defined states following a watchdog timer timeout IMPORTANT Protection With Inductive Loads The output mosfets have integrated shunt diode clamps connected from drain to source to help protect the output switch from damaging reverse emf voltages that exist when controlling inductive loads You may need to add external protection local to the inductive load for added protection and to prevent this emf from being distributed across the connection media For DC inductive loads place a diode across the load 1N4006 or equivalent with cathode to and anode to 4 Network Connections Wire network as shown in Network Connections Drawing 4501 805 Network common COM should connect to earth ground at one point 5 Grounding See Drawing Electrical Connections 4501 831 The module housing is plastic and does not require an earth ground connection WARNING For compliance to applicable safety and performance standards the use of shielded cable is recommended as shown in Drawing 4501 831 Further the appli cation of earth ground must be in place as shown in Drawing 4501 831 Failure to adhere to sound wiring and grounding practices may compromise safety amp perfor mance Software Installation The 900MB Configuration Software is used to configure Series DI 900MB modules and is installed as follows l Insert the DI 900MB Resource CD into your CD
29. the Module Status Register and optionally program the outputs to a pre defined state or level upon watchdog timeout The output watchdog timer is reinitiated via a read or write to any output channel Supported Modbus Commands The command amp response protocol for communicating with this module adheres to the Modbus RTU standard for the following Modbus Functions The register reference addresses that the function operates on is also indicated see 4 Module Configuration Code Function Reference 01 01H Read Coil Output Status 03 03H Read Holding Registers 4XXXX 04 04H Read Input Registers 3xxxx 05 05H Force Single Coil Output 06 06H Preset Single Register 4XXXX 08 08H Reset Slave Hidden 15 0FH Force Multiple Coils Outputs 16 10H Preset Multiple Registers AXXXX 17 11H Report Slave ID Hidden Configuration and Controls Module Push Button See Drawing Default DEF Push to engage or disengage the default communication mode Enclosure Dimensions 4501 833 with baud rate set to 9600bps module address set to 247 and no parity For Location selected The Status LED will flash ON OFF when the module is in the default mode A module will leave the default mode following a software or power on reset Status LED will be OFF or constant ON LED Indicators Run Green Constant ON indicates power is applied and unit is operating normally Fla
30. the byte count or force data No response is returned to broadcast queries from a master device Preset Multiple Registers 16 This command will preset a block of holding registers 4x reference addresses to specific values Broadcast trans mission is supported by this command and will act to preset the same block of registers in all networked slaves The Preset Multiple Registers query specifies the starting register reference address the number of registers and the data to be written in ascending order Note that registers are addressed starting at 0 registers 1 16 are addressed as 0 15 The Preset Multiple Registers normal response message returns the slave address function code starting register reference and the number of registers preset after the register contents have been preset Note that it does not echo the preset values The following example writes a new slave address of 200 a baud rate of 28800bps and sets parity to even by writing to holding registers 40001 through 40003 at slave device 247 changes to slave address baud rate and parity will take effect following the next software or power on reset An Introduction to Modbus 28 Preset Multiple Registers Example Query Model 917MB 918MB Modbus RS485 Network I O Modules Preset Multiple Registers Example Response Field Name Example Field Name Example Value Hex Value Hex Slave Address 247 F7 Slave Addre
31. use in the event the product must be shipped This module is physically protected with packing material and electrically p protected with an anti static bag during shipment However it is recom mended that the module be visually inspected for evidence of mishandling M J CAUTION prior to applying power This circuit utilizes static sensitive components and should only be handled SENSITIVE ELECTRONIC DEVICES a PEN Woon ea eT MAGNETIC OR RADIOACTIVE FIELDS Module Installation This transmitter module is packaged in a general purpose plastic enclosure Use an auxiliary enclosure to protect the unit in unfavorable environments or vulnerable locations or to maintain conformance to applicable safety standards Stay within the specified operating temperature range As shipped from the factory the unit is calibrated for all valid input ranges and has the default configuration shown in the table below WARNING Applicable IEC Safety Standards may require that this device be mounted within an approved metal enclosure or sub system particularly for applications with exposure to voltages greater than or equal to 75 VDC or SOVAC DI 918MB Default Factory Configuration Parameter Configuration Calibration Module Address 247 Baud Rate 9600bps Parity None 2 stop bits w No parity Stop Bits 2 When Parity None Response Delay 0 No Delay Output Range Each Output 0 20mA DI 917MB 0 10V DI 918
32. 181 181 4 20mA 723 3614 2891 0 20mA 0 3614 3614 Register Program Value Note that the effective resolution is 1 part in the DAC Span Output values use integers with 20000 representing 100 The required output register program value can be approximated using the DAC values shown above via the formula Register Value 20000 DAC Count DAC 0 DAC Span Current Output Register Program Value Output Current Range OmA 4mA 12mA 20mA 0 1mA 0 20000 4 20mA 0 10000 20000 0 20mA 0 1000 4000 12000 20000 Voltage Output Specifications DI 918MB Only Output Range 0 10V DC 0 5V DC or 0 1V DC Ranges are sub ranges of nominal 0 11 3V Output Maximum Voltage Output Accuracy Output Current Output Impedance Output Short Circuit Protection Response Time Output Resolution DAC Count Voltage design limit includes approximately 13 of over range 11 3V typical See Table Analog Output Range Resolution amp Accuracy on page 5 0 10mA DC maximum 1 Included 110us rise time typical 150us fall time typical unloaded for output to reach 98 of the final value in response to a step command Actual response time will vary with load 1 part in 4046 based on 11 368V full scale or 2 81mV bit 11 368V 4046bits The internal DAC count can be calculated by multiplying 355 96 by the sum of the output voltage and 0 1393 The resultant value rou
33. 3 44 MIS Decr T H 45 Series DI 900MB Software Interface Package Model 100969 45 DI 900MB Configuration amp Control Software oo cece ceceseeseeeseeeseceeeeeeeeeaecaeceseeseeesaeeaaesneenes 45 RS 232 to RS 485 Serial Adapter ue ope egredientes 45 Interfaces Cable 1x yack rene nette Re Peto t e nde eda ie P uox gs 45 Isolated Signal Converter Models 100974 and 100975 sse 45 Isolated Network Repeater Models 100977 and 100978 sess 45 Table of Contents vi Model 917MB 918MB Modbus RS485 Network I O Modules 1 Introduction These instructions cover the hardware functionality of the transmitter models listed in the table below Supplemen tary sheets are attached for units with special options or features Models Covered in This Manual Series Input Type Options Output Enclosure Approvals Factory Configuration DI 917MB 0900 C DI 918MB 0900 C Notes 1 Agency approvals include CE UL Listed and cUL Listed 2 Include the C suffix to specify factory configuration option Otherwise no suffix is required for standard con figuration Description The DI 900MB family is a group of process I O modules and accessories for Modbus RS485 network I O applica tions The Model DI 917MB and DI 918MB provide control of four analog ou
34. 8MB Modbus RS485 Network I O Modules The following example reads holding registers 40007 40009 channel 0 output value reset value and output con figuration at slave device 247 Read Holding Register Example Query Read Holding Register Example Response Field Name Example Field Name Example Value Value Hex Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 3 03 Function Code 3 03 Starting Address High Order 0 00 Byte Count 6 06 Starting Address Low Order 8 08 Data High Register 40007 3A Number Of Points High Order 0 00 Data Low Register 40007 15000 98 Number Of Points Low Order 3 03 Data High Register 40008 27 Error Check CRC Data Low Register 40008 10000 10 Data High Register 40009 00 Data Low Register 40009 1 01 Error Check CRC To summarize the contents of register 40007 two bytes is the channel 0 output value of 15000 or 75 3A98H The contents of register 40008 two bytes is the channel reset value of 10000 or 5096 2710H The contents of register 40009 is the channel 0 output configuration value two bytes of 0 20mAV 0001H Note that the analog output value is expressed as a 16 bit signed integer value with resolution of 0 00596 Isb The range is 163 84 32768 decimal to 163 835 432767 decimal For example 100 0 and 100 are rep resented by decimal values
35. Inc at 330 668 1444 to obtain your RMA number 2 Yourcompany Name with Billing and Shipping Addresses 3 Acomplete description of your problem or re calibration data 4 The contact person at your company with their telephone and facsimile numbers 5 Non Warranty returns additionally need your Purchase Order Number Please pack your returned instruments in their original shipping cartons or in equivalent strong protective shipping cartons Service and Repair Assistance This module contains solid state components and requires no maintenance except for periodic cleaning and transmit ter configuration parameter zero full scale setpoint deadband etc verification Since Surface Mount Technology SMT boards are generally difficult to repair it is highly recommended that a non functioning module be returned to DATAQ Instruments Inc for repair The board can be damaged unless special SMT repair and service tools are used Further DATAQ Instruments Inc has automated test equipment that thoroughly checks and calibrates the perfor mance of each module Please contact DATAQ Instruments Inc for complete details on how to obtain service parts and repair CAUTION Risk of Electric Shock More than one disconnect switch may be required to de energize the equipment before servicing Preliminary Service Procedure Before beginning repair be sure that all installation and configuration procedures have been followed
36. MB Watchdog Time 0 Timer Disabled Analog Output Timeout Level 0 Each Output Discrete Output Timeout State 1 ON Each Output Note Do not confuse the Default Factory Configuration noted above with the Default Communication Mode which refers to the fixed baud rate module address parity and stop bit settings achieved by pushing the Default Mode but ton until the yellow status LED flashes ON OFF The Default Communication Mode will temporarily over ride any factory configuration of baud rate module address parity and stop bits with settings of 9600bps 247 None and 2 respectively It is provided as a convenient means of achieving communication with a module when these parameters are unknown Your application will typically differ from the default factory configuration and will require that the transmitter be reconfigured to suit your needs This can be easily accomplished with the user friendly Windows 95 989 or NT DI Getting Started 13 Model 917MB 918MB Modbus RS485 Network I O Modules 900MB Configuration Program Configuration is normally done prior to field installation Refer to 6 Module Soft ware Configuration for detailed instructions Default Mode Switch A push button default mode switch DFT and status LED are provided at the front of the module as a convenient way of communicating with the module when its baud rate and address settings are unknown Push and hold this but ton until the Status LED flashes
37. Module has multi drop capability for up to 31 modules plus host without use of an RS485 repeater If a signal repeater is used for every 31 nodes up to 247 modules may be networked plus a host computer Up to 4000 feet without a repeater Distance can be extended with the use of a signal repeater In this mode the module address is 247 the baud rate is 9600bps the parity is none and the number of stop bits is set to 2 by pressing the DFT push button on the front of the module until the yellow Status LED flashes ON OFF This is provided as a means to communicate with a module when its internal address baud rate parity and stop bit settings are unknown Exit the Default Mode by pressing this button until the Status LED is NOT flashing constant ON or OFF or by issuing a software or power on reset New parameters for module address baud rate and parity do not take effect outside of Default Mode until after a software or power on reset Specifications 8 Model 917MB 918MB Modbus RS485 Network I O Modules Watchdog Timer A hardware watchdog timer is built into the microcontroller that causes it to initiate a self reset if the controller ever fails to return from an operation in a timely manner or locks up Additionally an output watchdog timer function is implemented that may be configured for timeout periods up to 65534 sec onds 18 2 hours The output watchdog timer will cause the status LED to blink rapidly set a bit in
38. NECTIONS gt BSEE SEE POSSIBLE VARIATIONS CURRENT SINKING DC APPLICATIONS ONLY H EMI 11 12 13 14 15 16 21 22 23 24 25 26 t FOUR OPEN DRAIN D OAARARARA RARAARAA OUTPUTS WITH A REMOVABLE R DA FL COMMON RETURN wei 4PRUG IN yee lee eee SHIELDED CABLE TERMINAL BLOCKS e SHIELDED CABLE oum 2 5 S f J f 3 S L R ou S ANALOG OUTPUT CONNECTIONS OV nrw WARNING FOR COMPLIANCE TO APPLICABLE SAFETY AND PERFORMANCE SEE OUTPUT CONNECTIONS AT LEFT STANDARDS THE USE SHIELDED CABLE IS RECOMMENDED AS SHOWN 4 ADDITIONALLY THE APPLICATION OF EART GROUND MUST BE IN PLACE AS SHOWN IN THIS DRAWING FAILURE TO ADHERE TO SOUND WIRING AND GROUNDING PRACTICES MAY COMPROMISE SAFETY AND PERFORMANCE FOR DC POWERED INTERPOSING RELAY EARTH GROUND SAFETY GUIDELINES MAY REQUIRE THAT THIS DEVICE BE HOUSED IN AN CONNECTIONS SEE DRAWING 4501 832 SEENOTE2 APPROVED METAL ENCLOSURE OR SUB SYSTEM PARTICULARLY FOR 450 1 83 1 A APPLICATIONS WITH VOLTAGES GREATER THAN OR EQUAL TO 75VDC 50VAC Interposing Relay Conn amp Contact Pro 4501 832 25 DC AC 88 POWER 83 10 TO 36VDC Ze OR2VAC INTERPOSING RELAY CONNECTIONS Bz NONPOLARIZED xz MODEL 917MB 0900 AND 918MB 0900 55 9 a Bu DIGITAL I O uo CONTACT PROTECTION 194006 OR EQUIVALENT AADAT DAADAA LOCATE RELAY NEAR LOAD SEE NOTE 2 E DC RELAY UUUSUSUU N lt
39. ON OFF to indicate the module is in the Default Communication Mode with a fixed module address of 247 baud rate of 9600bps no parity and 2 stop bits It is most convenient to configure a module in this mode then leave the default mode by pressing this button again until the Status LED stops flashing constant ON or OFF or by resetting the module The Default Mode is disabled following a software or power on reset New communication parameters baud rate address amp parity will take effect following a module reset after leaving the Default Mode Mounting Refer to Drawing Enclosure Dimensions 4501 833 for mounting and clearance dimensions DIN Rail Mounting This module can be mounted on type DIN rails Use suitable fastening hardware to secure the DIN rail to the mounting surface Units may be mounted side by side on 1 inch centers for limited space applica tions Rail 35mm Type EN50022 To attach a module to this style of DIN rail angle the top of the unit towards the rail and locate the top groove of the adapter over the upper lip of the rail Firmly push the unit towards the rail until it snaps solidly into place To remove a module first separate the input terminal block s from the bottom side of the module to create a clearance to the DIN mounting area Next insert a screwdriver into the lower arm of the DIN rail connector and use it as a lever to force the connector down until the unit disengages from the rail
40. RC value is calculated by the transmitting device and is appended to the message as the last field in a message the low order byte is appended first followed by the high order byte Thus the CRC high order byte is the last byte An Introduction to Modbus 31 Model 917MB 918MB Modbus RS485 Network I O Modules to be sent in a message The receiving device calculates a CRC during receipt of a message and compares the calcu lated value to that received in the CRC field If the two values differ an error results The is started by first preloading the 16 bit CRC register to all 1 s Successive 8 bit bytes of the message only the 8 data bits in each character no start stop or parity bits are applied to the current contents of the register and each 8 bit character is exclusive OR ed with the register contents The exclusive OR result is shifted in the direction of the least significant bit Isb of the CRC with a zero placed into the most significant bit msb The Isb is then extracted and examined if the lsb is a 1 the register is exclusive OR ed with a preset fixed value If the lsb is a 0 no exclusive OR takes place This process is repeated until 8 shifts have been performed After the last eighth shift the next 8 bit byte is exclusive OR ed with the register s current contents and the process repeats itself for 8 more shifts as described above The final contents of the CRC register after all the message bytes have been appl
41. ROM drive IMPORTANT Before continuing with installation be sure to exit any other Windows programs that may be running 2 The Window s AutoRun feature should start the CD and the installation software will run 3 Select the option Install DI 900MB Configuration Software and click on OK 4 Welcome Dialog Box appears Click on Next to continue with the installation or Cancel to abort 5 Fillout your user information in the appropriate text boxes and click on Next 6 The Choose Destination dialog box allows you to specify the program files destination directory To keep the default C Program Files Series900MB click on Next to change the destination click on the Browse button select a destination then click on Next 7 The Select Program Folder allows you to designate the program folder To keep the default Series900MB click on Next to choose a different folder make a selection from the list then click on Next 8 The Start Copying Files dialog box shows the current settings and allows you to change them by using the Back button To change settings click on the Back button until you reach the setting you would like to change change that setting and click on the Next button until you get back to the Start Copying Files dialog box To keep the current settings and install the software click on the Next button Getting Started 15 Model 917MB 918MB Modbus RS485 Network I O Modules 9 Setupis complete Click Fini
42. T 2 DC AC RESULTS IF SENSORS ARE INHERENTLY CONNECTED TO GROUND S ELECTRICAL CONN ECTIONS USE CAUTION AND AVOID MAKING ADDITIONAL GROUND CONNECTIONS POWER WHICH COULD GENERATE GROUND LOOPS AND MEASUREMENT ERROR MODEL 917 0900 AND 918MB 0900 NOTE 2 RETURNS SHOULD BE CONNECTED TO EARTH GROUND 25 OR2AVAC AT THE SAME POINT TO AVOID CIRCULATING GROUND CURRENTS 2 wowrolanZzED NOTE 3 EXTERNAL PULLUP RESISTOR USER SUPPLIED NE as pae CURRENT OUTPUT CONNECTIONS 917MB NOTE 4 RS485 PORT COMMON SHOULD CONNECT TO EARTH 8 GROUND AT ONE POINT DIGITAL OUTPUTS i ig SHIELDED CABLE SEE CONNECTIONS AT LEFT FI CHANNEL 1 OF 4 lt Ee Ee i CURRENT R 4 OUTLOAD b S i BLT UP TO 600 __ H RUN PWR LED GREEN EARTH S Im A STATUSLED YELLOW 7 UU GROUND RIN laa tH DEFAULT MODE SWITCH RUI Or PUSH FOR DEFAULT MODE a 44 2 ae E 34 33 32 31 E VOLTAGE OUTPUT CONNECTIONS 918MB BESSsEaa Eggers DFT4H STATUS LED FLASHES DIGITAL OUTPUTS RS485 PWR SHIELDED CABLE o1 RAPIDLY UPON a B WATCHDOG TIMEOUT CHANNEL 1 OF 4 S RN OUTPUT LED YELLOW 23 ON WHEN OUTPUTS ARE VOLTAGE R MODEL 918MB 0900 SHOWN oUTiQAD et CONDUCTING MODEL 917MB 0900 SIMILAR UP TO 10mA O v EARTH GROUND S ANALOG OUTPUTS ANALOG OUTPUTS _ 2 R azaz DIGITAL OUTPUT CON
43. Use the Communications Port Scroll Window to select the host COM port the module is connected to COMI or type in a COM port as required from COMI to COM99 The selected COM port is indicated in the lower right hand corner of the screen Use the Baud Rate scroll window to select the baud rate to be used by the host in communicating with the module Use the Parity scroll window to select Odd Even or No Parity checking by the software for data transfer Use the Slave Address scroll window to tell the software which module to address If you wish to maintain communications with a module following download you should check the Update Com munications settings at download box of the Settings window to keep the host in synch with a module if the mod ule settings are changed If the module is in the Default Mode indicated via a flashing status LED the baud rate address and parity assumed by the module are fixed at 9600bps 247 and No Parity You must use the same settings as the connected module Help Configuration Help Topics Your Model Help Topics About Modbus Configuration About Your Model Use Help to obtain information about using this software or configuring transmitters Note that context sensitive help is also available for help on a specific field or topic Simply click on the button then click on the field or topic of interest to obtain help on that subject You may also click the right mouse button to copy or
44. atus and module status DI 900MB modules are designed to withstand harsh industrial environments They feature RFI EMI ESD EFT and surge protection plus low temperature drift wide ambient temperature operation and isolation between signal I O power and the network They also have low radiated emissions per CE requirements As wide range DC powered devices these units may be powered from DC power networks incorporating battery backup Since input power is diode bridge coupled the unit may be connected to redundant power supplies or sev eral units may safely share a single DC supply The unit may also be powered from common 24VAC power Units are DIN rail mounted and removable terminal blocks facilitate ease of installation and replacement without having to remove wiring Transmitter power network and digital output wiring are inserted at one side of the unit while analog output wiring is inserted at the other side Plug in connectors are an industry standard screw clamp type that accept a wide range of wire sizes Flexible transmitter functionality network reprogrammability mixed signal I O and a network interface all combine in a single package to make this instrument extremely powerful and useful over a broad range of applications Fur ther the safe compact rugged reconfigurable and reliable design of this transmitter makes it an ideal choice for control room or field applications Custom module configurations are also
45. ch ever is greater Burr Brown DAC7615 12 bit Monotonic to 12 bits 0 1 of span or X2LSB typical whichever is larger for spans equal to or greater than 16mA DI 917MB or 5V DI 918MB Analog Output Range Resolution amp Accuracy Calibrated Out Range Effective Resolution Accuracy Percent of Span Model DI 917MB 0 to 20mA DC 02896 1 3614 0 1 span 0 02mA 4 to 20mA DC 035 1 2891 0 1 span 0 02mA 0 to DC 552 1 181 1 6 span 0 002 Model DI 918MB 0 10V DC 02896 1 3559 0 1 span 10mV 0 5V DC 056 1 1779 0 1 span 5mV 0 1V DC 281 1 356 0 8 span 8mV Digital Output Specifications Four open drain outputs are installed in this module and operate as discrete outputs coils for control of external devices Digital outputs go to their OFF state following a software or power on reset of the module but may be optionally sent to user defined states following a watchdog timer timeout Note To control a higher amperage device such as a pump an interposing relay may be used see Drawing Inter posing Relay Conn amp Contact Pro 4501 832 Specifications 5 Model 917MB 918MB Modbus RS485 Network I O Modules Output Channel Configuration Output OFF Voltage Range Output OFF Leakage Current Output ON Current Range Output Rg ON Resistance Output Response Time Output Over Temperature Protec tion Output Ov
46. cimal values 20000 0 and 20000 respectively The full range is 163 84 32768 decimal to 163 835 32767 decimal Temperature 16 bit signed integer value with resolution of 0 1 C Isb For example a value of 12059 is equivalent to 1205 9 C a value of 187 equals 18 7 C The maximum possible temperature range is 3276 8 C to 3276 7 C Discrete A discrete value is generally indicated by a single bit of a 16 bit word The bit number position typically corresponds to the discrete channel number for this model Unless otherwise defined for outputs a 1 bit means the corresponding output is closed or ON a 0 bit means the output is open or OFF For inputs a value of 1 means the input is in its high state usually gt gt OV while a value of 0 specifies the input is in its low state near OV Modbus Error Checking Fields Modbus networks employ two methods of error checking parity checking even or odd parity or none and frame checking Cyclical Redundancy Check Parity Checking A Modbus device can be configured for Even or Odd parity checking or for no parity checking and this determines how the parity bit of the data frame is set If even or odd parity checking is selected the number of 1 bits in the data portion of each character frame is counted Each character in RTU mode contains 8 bits The parity bit will then be set to a or a 1 to result in an even Even parity or odd Odd parity total
47. converters or host software systems cannot accept an immediate response from a slave device without additional delay The following sections guide you through the DI 900MB Configuration Program property sheets used to configure the DI 918MB Transmitter Property sheets vary slightly from model to model but the general approach is the same If you have trouble understanding parameters unique to your module you can also refer to the on line help feature Module Software Configuration 33 Model 917MB 918MB Modbus RS485 Network I O Modules Starting The Program After clicking on the Series DI 900MB pro gram icon to boot the Configuration Program a screen will be displayed similar to that shown at right To begin click on the Settings Serial Com munications pull down menu or press Ctrl E to set the COM port baud rate parity and slave address that the host computer will use to communicate with the module Option ally you can check the Update Communica tions settings at download box to automatically change the host settings to if Series 900MB Configuration x Module Settings Help Digg o Ne Dep ee aust Communications Settings x Communications Port mE sj Cancel Parity NONE Lose Slave Address 247 Y Baud Rate 3600 Update Communications settings at download match the module if new settings are later downloaded to the module recommended to convenie
48. ction Code 17 11 Error Check CRC Byte Count 26 1A Slave ID 0 00H 924MB 0900 1 01H 913MB 0900 2 02H 914MB 0900 3 03H 917MB 0900 4 04H 918MB 0900 5 05H 901MB 0900 6 06H 902MB 0900 7 07H 903MB 0900 8 08H 904MB 0900 9 09H 905MB 0900 10 OAH 906MB 0900 Run Indicator Status ON 255 FF An Introduction to Modbus 29 Model 917MB 918MB Modbus RS485 Network I O Modules Firmware Number ASCII ACROMAG 9300 0374 Byte String Additional 917MB 0900 41 43 52 AF 4D Data Field 41 47 2C 39 33 30 30 2D 30 33 37 41 2C 39 31 37 4D 42 2D 30 39 30 30 2CH Serial Number ASCII Byte Six Numbers Revision String Unique Per Mod 123456A 31 32 33 34 35 36 ule 41H Error Check CRC The Report Slave ID response message returns the slave model ID and firmware number string as shown above Reset Slave 08 This command is used to trigger a reset of the module and its effect is equivalent to a power on reset of the module Note that changes to baud rate slave address and parity are initiated following reset The Reset Slave command uses sub function 01 Restart Communications of the standard Modbus Diagnostics Command 08 to accomplish a mod ule reset This function does not operate on register map locations Broadcast transmission is not supported The Reset Slave query simply sends the slave address function code sub function code an
49. d data data is ignored and simply echoed back with error check CRC A Reset Slave response is simply an echoed acknowledge that is returned just before the reset is executed Allow a few seconds following reset to re initiate communication with a module Reset Slave Example Query Reset Slave Example Response Sent Prior To Reset Field Name Example Field Name Example Value Value Hex Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 08 08 Function Code 08 08 Sub Function High Order Byte 0 00 Sub Function High Order Byte 0 00 Sub Function Low Order Byte 1 01 Sub Function Low Order Byte 1 01 Data Field High Order Byte 0 00 Data Field High Order Byte 0 00 Data Field Low Order Byte 0 00 Data Field Low Order Byte 0 00 Error Check CRC Error Check CRC Note that the response simply echoes the query just before the reset is triggered For Modbus software that does not support the Reset Slave function an alternate method of generating a module reset is provided via a write to the Calibration Access amp Module Reset Register See Register 40020 of Register Map Modbus Data Field The data field of a message frame contains a multiple of 8 bits that provides the slave with any additional information the slave requires to complete the action specified by the function code The data field typically includes register address
50. d delay applied between message receipt by the module and its response to the host A fixed amount of delay is already present and varies with the model Thus you will have to specify a com parable amount of response delay to measure any affect Some host software or signal converters require additional delay to work properly Note that slave address baud rate and parity selections take effect following a configuration download and do not alter the settings used by the host software which are configured separately via the Settings menu If you checked the Update Communications Settings at Download box of the Settings pull down menu this soft ware will change the host settings to match the module settings that take effect following a download in an effort to maintain communication with the module Otherwise you must change the host Settings separately after downloading to match the new module settings If the module is in Default Mode indicated via a flashing status LED the baud rate address amp parity of the module are fixed at 9600bps 247 and No Parity Output Channels Use the Range scroll bar to pick one of the following ranges according to your model DI 917MB DI 918MB 0 20mA 0 10V DC 4 20mA 0 5V DC 0 1mA 0 1V DC The analog output utilizes percent of span units with 20000 representing 310096 That is for the 4 20mA range 0 indication 0 represents 4mA and 100 20000 represen
51. da 5V E COM as NAMES K RS485 4i ISOLATED RS485 PORT OUTO 4 4 i OUT T 4 oure 4 __ ouT3 r PUSH FOR DEFAULT RTN O O MODE STATUS LED V wl WILL FLASH Nod DEFAULT MODE SWITCH 2 MODEL 917MB 0900 AND 918MB 0900 QUAD ANALOG AND DIGITAL OUTPUT MODULES WITH ISOLATED RS485 Block Diagrams Schematics 41 Model 917MB 918MB Modbus RS485 Network I O Modules Functional Block Diagram 4501 829 Reset State Timeout State On Off Digital Process Variable PV PV OPEN DRAIN OUTPUT Engineering Units Percent of Span lt gt Read Write Via Software Command DISCRETE ANALOG OUTPUTS OUTPUT Output Ranges Analog OUTPUT Type BLOCK 0 1V 0 5V 0 10V 0 20mA 4 20mA 0 ma Reset Value Timeout Value PV OUT Counts V OUT RS485 SENSOR REGISTER NETWORK OUTPUT BLOCK MEMORY INTERFACE MODEL 917MB 0900 amp 918MB 0900 TRANSMITTER FUNCTIONAL BLOCK DIAGRAM 4501 829A Network Connections 4501 805 MASTER PERSONAL COMPUTER SERIES 9XXMB NETWORK CONNECTIONS
52. discrete outputs or coils Ox reference addresses in the slave For DI 918MB models its response is equivalent to reading the gate signals of the n channel mosfets that drive the outputs Broadcast transmission is not supported The Read Coil Status query specifies the starting coil output channel and quantity of coils to be read Coils corre spond to the discrete open drain outputs of this transmitter and are addressed starting from 0 up to 4 coils addressed as 0 3 for this model The Read Coil Status in the response message is packed as one coil or channel per bit of the data field The output status is indicated as 1 for ON sinking current and 0 for OFF not conducting The LSB of the first data byte cor responds to the status of the coil addressed in the query The other coils follow sequentially moving toward the high order end of the byte Since this model has only 4 outputs the remaining bits of the data byte will be set to zero toward the unused high order end of the byte The following example reads the output channel status of coils 0 3 at slave device 247 Read Coil Status Example Query Read Coil Status Example Response Field Name Example Field Name Example Value Value Hex Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 1 01 Function Code 1 01 Starting Address High Order 0 00 Byte Count 2 02 Starting Address Low Order 0 00 Data
53. e Default 0 0 20mA 00 0 0 20mA 01 1 4 20mA 102220 1mA 11 Reserved Note that the 0 20mA range may not precisely go to the OmA end point It will typically approach OmA within 0 1 40009 8 0008 CHO Output Config Bits 15 2 Zero uration DI 918MB Bits 1 0 V Output Range Default 0 0 10V 00 0 0 10V 012120 5V 10 2 0 1V 11 Reserved 40010 9 0009 CH 1 Output Value Percentage 2 After reset this register reads and this register Default 0 is not maintained in EEPROM 40011 10 000A CH Timeout Value Percentage 96 Write 32767 7FFFH to leave output unaffected Default 0 by a watchdog timeout 40012 11 000B CHI Output Config Bits 15 2 Zero uration DI 917MB Bits 1 0 I Output Range Default 0 0 20mA 00 0 0 20mA 01 1 4 20mA 10 2 0 11 Reserved Note that the 0 20mA range may not precisely go to the end point It will typically approach OmA within 0 1 40012 11 000B CHI Output Config Bits 15 2 Zero uration DI 918MB Bits 1 0 V Output Range Default 0 0 10V 00 02 0 10V 012120 5V 10 2 0 1V 11 Reserved 40013 12 000C CH2 Output Value Percentage 2 Default 0 Module Configuration 19 Model 917MB 918MB Modbus RS485 Network I O Modules Ref Addr Description Data Type Format 40014 13 000D CH 2 Timeout Value Percentage 2 Write 32767 7FFFH to leave out
54. e byte contains two 4 bit hexadecimal characters and the message is transmitted in a continuous stream The format for each byte in RTU mode is outlined below RTU Mode Byte Format Coding System 8 bit binary hexadecimal 0 9 A F two hexadecimal characters contained in each 8 bit field of the message Bits Per Byte 1 start bit 8 data bits Isb sent first 1bit for even odd parity or no bit for no parity 1 stop bit if parity is used or 2 stop bits with no parity Error Check Field Cyclical Redundancy Check CRC A master s query is comprised of a slave address or broadcast address a function code defining the requested action any required data and an error checking field A slave s response is comprised of fields confirming the action taken any data to be returned and an error checking field The query and response both include a device address function code data byte s error checking field If an error occurred in the receipt of the query or if the slave is unable to perform the requested action the slave will return an exception message as its response see Modbus Exceptions The error check field allows the master to confirm that the message contents are valid Modbus Message Framing A Modbus message is placed in a frame by the transmitting device A frame is used to mark the beginning and end ing point of a message allowing the receiving device to determine which device is being addressed and to kn
55. eparately Module Software Configuration 39 Model 917MB 918MB Modbus RS485 Network I O Modules Output Calibration Procedure 1 Prior to attempting calibration be sure to upload the module s current configuration via Module Upload Config uration This will help to prevent miscalibration by recalling the module s current calibration Click on the Output Cal property sheet tab to display the screen shown above Click on the Calibrate Enable check box of the output channel to calibrate Connect a meter to measure the output signal as required For current outputs you can place an ammeter in series with your load or a voltmeter across a precision load resistor to monitor voltage Observe proper polarity Be sure to use a meter of greater accuracy than the module itself Use the slide control by clicking and dragging it with your mouse until the output signal is equivalent to the Low Calibration Value Use the right or left arrow keys to increment or decrement the output signal until the output is precisely equivalent to the Low Calibration Value within 1 DAC step Does the measured value match the Low Calibration Value within 0 1 of output span If not then continue to tap the arrow keys slowly until itis within the acceptable error band Then click on the Low Calibrate button to set the Low Calibration endpoint As in Step 4 use the slide control and right left arrow keys to adjust the output to the High Calibration Value Make
56. er 0 00 Preset Data Low Order 2 02 Preset Data Low Order 2 02 Error Check CRC Error Check CRC The response simply echoes the query after the register contents have been preset No response is returned to broad cast queries from a master device Force Multiple Coils 15 This command will simultaneously force a sequence of coils Ox reference addresses either ON or OFF Broadcast transmission is supported by this command and will act to force the same block of coils in all networked slaves The Force Multiple Coils query specifies the starting coil reference address to be forced the number of coils and the force data to be written in ascending order The ON OFF states are specified by the contents in the query data field A logic 1 in a bit position of this field requests that the coil turn ON while a logic 0 requests that the corresponding coil be turned OFF Unused bits in a data byte should be set to zero Note that coils are referenced starting at 0 up to 4 coils are addressed as 0 3 for this model and this also corresponds to the discrete output channel number An Introduction to Modbus 27 Model 917MB 918MB Modbus RS485 Network I O Modules The Force Multiple Coils normal response message returns the slave address function code starting address and the number of coils forced after executing the force instruction Note that it does not return the byte count or force value The following
57. er Current Protection Output Channel Configuration Four open drain mosfet switches which share a common return source connection at the RTN terminal For DC voltage and current sinking applications only observe proper polarity To control higher voltage and or current or for controlling AC an interposing relay may be used see Drawing Electrical Connections 4501 831 0 35V DC continuous 47Vpk 0 1uA typical 500 maximum 25 C 40VDC 0 to 1A DC continuous for each output switch group one RTN per each group of 2 outputs No deration required at elevated temperatures 0 150 Maximum 25 C 1A Outputs will switch within 5ms typical upon receiving a control command Outputs will turn off if the junction temperature of the device exceeds 165 C Cycling the output off on will restart the output Outputs will turn off if the drain current reaches 5A Cycling the output off on will restart the output Enclosure Physical Specifications See Drawing Enclosure Dimensions 4501 833 Units are packaged in a general purpose plastic enclosure that is DIN rail mountable for flexible high density approximately 1 wide per unit mounting Dimensions DIN Rail Mounting 0 Connectors Case Material Printed Circuit Boards Shipping Weight Approvals xxx0 Width 1 05 inches Height 4 68 inches Depth 4 35 inches see Drawing Enclosure Dimensions 4501 833 DIN rail mount Type EN50022
58. es count values and written data The data field can be nonexistent for some commands zero length as not all messages require data If no error occurs the data field of a response from a slave will return the requested data If an error occurs the data field returns an exception code see Modbus Exceptions that the master application can use to determine the next action to take Supported Data Types All T O values are accessed via 16 bit Input Registers or 16 bit Holding Registers see Register Map Input registers contain information that is read only For example the current input value read from a channel or the states of a An Introduction to Modbus 30 Model 917MB 918MB Modbus RS485 Network I O Modules group of digital inputs Holding registers contain read write information that may be configuration data or output data For example the high limit value of an alarm function operating at an input or an output value for an output channel I O values for this model are represented by the following simple data types for percent of span and dis crete on off Summary Of Data Types Used By DI 900MB Modules Data Types Description Count Value 16 bit signed integer value representing an A D count a DAC count or a time value with a range of 32768 to 32767 Percentage A 16 bit signed integer value with resolution of 0 005 Isb 20000 is used to represent 100 For example 100 0 and 100 are represented by de
59. example forces outputs 1 amp 3 OFF and 0 amp 2 ON for coils 0 3 at slave device 247 Force Multiple Coils Example Query Field Name Example Value Hex Slave Address 247 F7 Function Code 15 OF Coil Address High Order 0 00 Coil Address Low Order 0 00 Number Of Coils High Order 0 00 Number Of Coils Low Order 4 04 Byte Count 01 Force Data High First Byte 5 05 Error Check CRC Note that the leading character of the Ox reference address is implied by the function code and omitted from the address specified In this example the first address is 00001 corresponding to coil 0 and referenced via 0000H Thus the data byte transmitted will address coils 3 0 with the least significant bit addressing the lowest coil in this set as follows note that the four unused upper bits of the data byte are set to zero Bin 0 0 0 0 0 1 0 1 0 5 Coil NA NA NA NA 3 2 I 0 Force Multiple Coils Example Response Field Name Example Value Hex Slave Address 247 F7 Function Code 15 Coil Address High Order 0 00 Coil Address Low Order 0 00 Number Of Coils High Order 0 00 Number Of Coils Low Order 4 04 Error Check CRC The normal response returns slave address function code starting coil address and quantity of coils forced after executing the force instruction It does not return
60. he right Dupa 2 Df Value 4000 mADC 5 Digital Output 3 Off Output Count O wite on will be displayed Model DI 917MB Test screen shown Restore Default Analog Output 3 m Digital Output 3 Output Range 4 20m4DC o Value 4 000 The flashing green Status lamp next to Poll esa Output Count o White On ing Status indicates the software is commu nicating with the module and polling its I O _FatHelp press FT coM2 MODULE Polling is automatic when this screen is dis played and turns off if another screen is selected The graphic simulation of the module LED s reflects the current LED status of the module You can reset the module by clicking the Reset button same effect as power on reset Note that a module will exit the Default Mode following a reset New address baud rate and parity settings will take effect immediately follow ing a reset to continue communications following reset be sure to make host software adjustments accordingly via the Settings pull down menu For each analog output the current selected output range and output value Value are indicated A type field and Write button are provided for writing the output count The count value is written in percent of span units with 20000 representing 100 You can write any value from 0 to 20500 for the Model DI 917MB That is for the 4 20mA output range
61. his register will cause an immediate module reset This is provided as an alternate method of Reset for software that does not support the Reset Slave 08 command After a reset this register reads 0 write protection enabled and no reset This register is not maintained in EEPROM 40020 19 0013 CHO Cal High Value Raw DAC Value Register See Module Calibration 40021 20 0014 Cal Low Value Raw DAC Value Register See Module Calibration 40022 21 0015 CHI Cal High Value Raw DAC Value Register See Module Calibration 40023 22 0016 CHI Cal Low Value Raw DAC Value Register See Module Calibration 40024 23 0017 CH2 Cal High Value Raw DAC Value Register See Module Calibration 40025 24 0018 CH2 Cal Low Value Raw DAC Value Register See Module Calibration 40026 25 0019 CH3 Cal High Value Raw DAC Value Register See Module Calibration 40027 26 001A CH3 Cal Low Value Raw DAC Value Register See Module Calibration Module Configuration 20 Model 917MB 918MB Modbus RS485 Network I O Modules Notes Register Map 1 Note that the Report Slave ID and Reset Slave functions do not operate on Register Map locations 2 Output values are indicated in percent of span units represented by a 16 bit signed integer value with resolution of 0 005 5 The range is 163 84 32768 decimal to 163 835 32767 decimal For example 100 0 and 100 are represented by the decimal va
62. ied is the CRC value Modbus Exceptions If an unsupported function code is sent to a module then the exception code 01 Illegal Function will be returned in the data field of the response message If a holding register is written with an invalid value then exception code 03 Illegal Data Value will be returned in the response message The following table lists possible exception codes Modbus Exception Codes Code Exception Description 01 Illegal Function The function code received in the query is not allowed or invalid 02 Illegal Data Address The data address received in the query is not an allowable address for the slave or is invalid 03 Illegal Data Value A value contained in the query data field is not an allowable value for the slave or is invalid 04 Slave Device Failure An unrecoverable error occurred while the slave was attempting to per form the requested action 05 Acknowledge The slave has accepted the request and is processing it but a long dura tion of time is required to do so This response is returned to prevent a timeout error from occurring in the master 06 Slave Device Busy The slave is engaged in processing a long duration program command The master should retransmit the message later when the slave is free 07 Negative Acknowledge The slave cannot perform the function received in the query This code is returned for an unsuccessful programming request using function code 13 or 14
63. ions 4501 831 Observe proper polarity when making connections see label for output type Note Analog outputs go to their minimum levels following a software or power on reset of the module Out puts may be optionally sent to user defined levels following a watchdog timer timeout 3 Digital Outputs Coils AII discrete outputs are the open drains of n channel mosfets whose source terminals share return RTN Externally wired drain pullups or other load is generally required All outputs include tran sient voltage suppressers and integrated snubbers but may require additional protection when switching induc tive loads see below Refer to the Digital Output Specifications section for output specifications and see the module side label for terminal designations Note that these outputs are for current sinking low side switching Getting Started 14 Model 917MB 918MB Modbus RS485 Network I O Modules applications only Digital outputs are turned OFF following a software or power on reset of the module but can be optionally programmed to user defined states following a watchdog timer timeout Observe proper polarity when making connections The output circuitry as a group is electrically isolated from the network and power circuits If necessary an interposing relay can be used to switch higher currents as illustrated in the Interposing Relay Connection Drawing 4501 832 Note Digital outputs go to their OFF state following a software
64. it is to operate on i e Ox 1x or 4x reference addresses For example holding register 40001 is addressed as register 0000 in the data address field of the message The function code that operates on this register specifies a holding register operation and the 4 reference is implied Holding register 40108 is addressed as register 006BH 107 decimal Modbus Functions The function code field of a message frame contains the 8 bits that tell the slave what kind of action to take Valid codes are in the range 1 255 Not all codes apply to a module and some codes are reserved for future use The fol lowing table highlights the subset of standard Modbus functions supported by the Model DI 918MB module the ref erence register addresses that the function operates on are also indicated Code Function Reference 01 01H Read Coil Output Status 03 03H Read Holding Registers 4XXXX 04 04H Read Input Registers 3xxxx 05 05H Force Single Coil Output 06 06H Preset Single Register 4XXXX 08 08H Reset Slave Hidden 15 0FH Force Multiple Coils Outputs 16 10H Preset Multiple Registers AXXXX 17 11H Report Slave ID Hidden These functions are used to access the registers outlined in the Register Map for sending and receiving data Note that the Report Slave ID and Reset Slave commands do not operate on register map registers When the sla
65. j DATAQ INSTRUMENTS The way PC based instrumentation should be DI 900MB Series Modbus RS485 Network I O Modules Model DI 917MB Quad Current Output Model DI 918MB Quad Voltage Input User s Manual Copyright O 2003 by DATAQ Instruments Inc The Information contained herein is the exclusive property of DATAQ Instruments Inc except as otherwise indicated and shall not be reproduced transmitted transcribed stored in a retrieval system or translated into any human or computer language in any form or by any means electronic mechanical magnetic optical chemical manual or otherwise without expressed written authorization from the com pany The distribution of this material outside the company may occur only as authorized by the company in writing DATAQ Instruments hardware and software products are not designed to be used in the diagnosis and treatment of humans nor are they to be used as critical components in any life support systems whose failure to perform can rea sonably be expected to cause significant injury to humans Windows 95 98 amp NT are registered trademarks of Microsoft Corporation Modbus is a registered trademark of Modicon Inc DATAQ j INSTRUMENTS 241 Springside Dr Suite 200 Akron Ohio 44333 U S A Telephone 330 668 1444 Fax 330 666 5434 Designed and manufactured in the United States of America Warranty and Service Policy Product Warranty DATAQ Instruments Inc wa
66. l Output Chan The four lower order bits of this 16 bit register value define the nel Watchdog Time state the output channels will be programmed to following a out States watchdog timeout Timeout control of the outputs will take prece Default 65535 Dis dence over alarm and direct control Bit 0 corresponds to channel abled 0 bit 1 to channel 1 bit 2 to channel 2 and bit 3 to channel 4 Write 65535 FFFFH to this register to leave the outputs unchanged following a timeout this is also the default value Note Clearing a timeout via an I O read or write does not return the output s to their initial state or level They remain at their timeout state or level until otherwise written 40006 5 0005 Response Delay Can be set from 0 to 65500 ticks 1 tick 1 085us This is the Time Turnaround additional delay the module will wait before responding to a mes Delay Default 0 sage from the host Increase this value if you have trouble com No Delay municating with the module or you encounter a high degree of error messages 40007 6 0006 CH 0 Output Value Percentage 2 After reset this register reads 0 and this register Default 0 is not maintained in EEPROM 40008 7 0007 CH 0 Timeout Value Percentage 2 Write 32767 7FFFH to leave output unaffected Default 0 by a watchdog timeout 40009 8 0008 CHO Output Config Bits 15 2 Zero uration DI 917MB Bits 1 0 I Output Rang
67. lows a configuration to be uploaded or downloaded to from the module via the RS485 interface Provides controls to separately calibrate each output Provides control to reset a module Provides control to restore a module s original default factory output calibration in case of miscalibration Reads the contents of the Module Status Register Allows optional user documentation to be assigned to a module the module Documentation fields are provided for tag number comment configured by location and identification information This information can also be uploaded from the module and printed via this software Allows a module s complete configuration to be printed in an easy to read one page format including user doc umentation Specifications 11 Model 917MB 918MB Modbus RS485 Network I O Modules 3 Getting Started Unpacking and Inspection Upon receipt of this product inspect the shipping carton for evidence of mishandling during transit If the shipping carton is badly damaged or water stained request that the carrier s agent be present when the carton is opened If the carrier s agent is absent when the carton is opened and the contents of the carton are damaged keep the carton and packing material for the agent s inspection For repairs to a product damaged in shipment refer to the Warranty and Service Policy to obtain return instructions It is suggested that salvageable shipping cartons and packing material be saved for future
68. lue p Do Not Change Analog Output 0 v If you checked the Watchdog Reset box of the General property sheet described on the Watchdog Setup 1 previous page you will be allowed to make Output 1 Range 4 20mADC changes to the parameters of this page Digital Output Watchdog Timeout Value Of Use this page to configure the watchdog tim I eout output states and levels for the corre sponding digital and analog outputs ESTE EHE COM2 MODULE Timeout states and levels may be set for each of the four analog and digital outputs of this model A watchdog timeout will automatically drive the outputs to the states levels defined here when enabled A watchdog timer may be applied to the output channels of this module and the timeout delay is set via the General property sheet described on the previous page A watchdog timeout will occur if no channel I O has occurred over the specified timeout period For example if communication with the unit is lost Optionally you can use the param eters of this property sheet to define the states that the digital outputs are to be programmed to upon output timeout You can also define the timeout levels that the analog outputs will be programmed to upon timeout Watchdog time out state or level control takes precedence over direct control of the output channels A watchdog timeout is cleared and the timer reinitiated via a read or write to any output channel or by resetting the module Note that
69. lues 20000 0 and 20000 respectively Clearing a watchdog timeout does not return an output to its pre timeout level it remains at its timeout level until otherwise written 3 Configuration variables stored in holding registers 4xxxx reference addresses are maintained in EEPROM except for the Calibration Access amp Reset Register and Output Value Registers Changes to configuration regis ters do not take effect until the next software or power on reset of the module 4 WARNING Access to register entries 40020 to 40027 are normally not required and writes to these registers should be avoided to prevent module miscalibration Module Calibration Series DI 917MB DI 918MB Analog Output Modules are calibrated using a single output range with fixed calibra tion points The calibration of the model s sub ranges are interpolated based on these results Prior to calibration DI 917MB units must have the 0 20mA output range selected while DI 918MB units must have the 0 10V output range selected Calibration is performed by adjusting the output signal level until its measured value precisely matches the low or high calibration point With the output level precisely adjusted to the low or high calibration point the output channel s Raw DAC Count is then read from the module registers 30006 30009 of the Memory Map This same value is then written to the corresponding channel s respective Cal High or Cal Low register registers 40020 40027 of Memor
70. n Data Logger Chart Recorder Thermocouple Oscilloscope
71. nded can be used to calculate the effective resolution and to approximate the required output regis ter program value see below Specifications 4 Model 917MB 918MB Modbus RS485 Network I O Modules Internal DAC Count Versus Voltage Output Range Range DAC 096 DAC 10096 DAC Span 0 1V 50 406 356 0 5V 50 1829 1779 0 10V 50 3609 3559 Register Program Value Note that the effective resolution is 1 part in the DAC Span Output values use integers with 20000 representing 100 The required output register program value can be approximated using the DAC values shown above via the following formula Register Value 20000 DAC Count DAC 0 DAC Span Current Output Register Program Value Output Voltage Range OV 1V 2 5V 5V 10V 0 1V 0 20000 zx m 0 5V 4000 10000 20000 0 10 0 2000 5000 10000 20000 General Output Specifications Accuracy Resolution Ambient Temperature Effect Digital to Analog Converter Integral Non Linearity Accuracy is better than 0 1 of span typical for 4 20mA 0 20mA 0 10V and 0 5V ranges see Table Analog Output Range Resolution amp Accuracy on page 5 This includes the effects of repeatability terminal point confor mity and linearization See Table Analog Output Range Resolution amp Accuracy on page 5 Better than 01 of output span per C 100ppm C or 1 0uV C whi
72. noise Digital to Analog Converters for high accuracy and reliability LED Indicators A green LED indicates power A yellow status LED will flash if the unit is placed in the default communication mode It will also flash rapidly upon watchdog timeout A yellow output LED indicates the ON OFF state of the associated open drain output Default Communication Mode A push button switch is provided to set the module to a default set of commu nication parameters for baud rate module address parity and number of stop bits This provides a convenient way of establishing communication with the module when its internal settings are unknown Introduction 2 Model 917MB 918MB Modbus RS485 Network I O Modules 2 Specifications General The Model DI 917MB amp DI 918MB are DC powered or 24VAC powered network transmitters which drive up to four analog output signals current or voltage plus four open drain output switches and provide an isolated RS485 Modbus network interface Isolation is supplied between the output circuit as a group the network and power The outputs may operate as discrete on off controls for external devices This transmitter is DIN rail mounted The unit is configured and calibrated with our user friendly Windows 95 989 or NT DI 900MB Configuration Pro gram Optionally you may use your own software as long as you adhere to the Modbus command response format for supported commands A push button on the module allo
73. ntly maintain communication with a module following reconfiguration For Help press F1 COM2 MODULE Note that the host COM port selected is indicated in the first box of the lower right hand corner MODULE is indi cated in the third box if a connected module is detected by the software The fourth and fifth boxes indicate NUM for Num lock and CAP for Caps lock respectively File New Open Save Save As Print Print Preview Print Setup Recent File Indicated Exit Use File New to create a new configuration file You will be prompted to select a model number Use File Open to open an existing configuration file Use File Save to save the current configuration file to disk Use File Save As to save the current configuration file to a new file name Use File Print to get a printout of the currently loaded configuration file Use File Print Preview to view the cur rent configuration or preview the print documentation Use File Print Setup to select a printer and font style Module Upload Configuration Download Configuration Use Module Upload Configuration to upload the module s current configuration and calibration Use Module Download Configuration to write the currently loaded configuration to the module Settings Serial Communications Communications Port Host Baud Rate Host Parity Module Software Configuration 34 Model 917MB 918MB Modbus RS485 Network I O Modules Slave Address
74. nverter Models 100974 and 100975 This unit provides an isolated interface between the host PC s RS 232 port and RS 485 Modbus network devices Signal conversion is bidirectional with operation that is transparent to all devices The RS 485 network supports up to 32 devices including the Signal Converter across 4000 foot distances Installation of additional network devices or extending the distance requires the Network Repeater described below Optional 115V AC Power Model 100974 or 230V AC Power Model 100975 Power cord included The Model Number 100976 connects the PC s RS 232 port to the Isolated Signal Converter Isolated Network Repeater Models 100977 and 100978 This unit isolates and boosts RS 485 signals to extend communication distances or increase the number of devices on the network Each Repeater permits the addition of a network branch with up to 32 devices including the Network Repeater and will transmit RS 485 signals another 4000 feet Operation is transparent to all devices and no hand shaking is required Two terminal blocks are provided for 120 ohm resistors to terminate both ends of the network branch Optional 115V AC Power Model 100977 or 230V AC Power Model 100978 Accessories 45 Bi DATAQ INSTRUMENTS DATAQ Instruments Inc 241 Springside Drive Akron Ohio 44333 Telephone 330 668 1444 Fax 330 666 5434 E mail support datag com Direct Product Links click on text to jump to page Data Acquisitio
75. og output values are expressed as a 16 bit signed integer value represent ing percent of span resolution of 0 00596 1sb The range is 163 8496 32768 decimal to 163 835 32767 decimal For example 100 0 and 100 are represented by decimal values 20000 0 and 20000 respectively Digital Outputs Output State The coil registers references may be read via the Read Coil 01 command to determine the current state of the outputs The current output state is also indicated by a yellow status LED at the front of the module which lights when the corresponding output is sinking current The Force Single Coil 05 and Force Multiple Coil 15 commands may be used to directly control the output state via the coil registers Output Timeout State The state that the corresponding discrete output will be automatically pro grammed to following a watchdog timeout Output Visual Indication Yellow output LED s provide visual status indication of the current state of the corresponding output channel LED is ON when switch is ON and sinking cur rent Other Modbus Configuration Software Capabilities In addition to configuring all features of the module described above the Modbus Configuration Software includes additional capabilities for testing and control of this module as follows 1 Monitors and controls analog output signal values and the discrete output signal states It also allows polling to be turned on or off Al
76. ow when the message is completed It also allows partial messages to be detected and errors flagged as a result RTU mode messages start with a silent interval of at least 3 5 character times implemented as a multiple of character times at the baud rate being used on the network indicated as t1t2t3t4 below The first field transmitted is the device address The allowable characters transmitted for all fields are hexadecimal values 0 9 A F A networked device continuously monitors the network including the silent intervals and when the first field is received the address the device decodes it to determine if it is the addressed device Following the last character transmitted a similar silent interval of 3 5 character times marks the end of the message and a new message can begin after this interval A typical message frame is shown below RTU Message Frame Start Addr Function Data CRC End t1t2t3t4 8 bits 8 bits nx8 bits 16 bits t1t2t3t4 The entire message must be transmitted as a continuous stream If a silent interval of more than 1 5 character times occurs before completion of the frame the receiving device flushes the incomplete message and assumes the next byte will be the address field of a new message An Introduction to Modbus 23 Model 917MB 918MB Modbus RS485 Network I O Modules In similar fashion if a new message begins earlier than 3 5 character times following a previous message the recei
77. possible please consult the factory Introduction 1 Model 917MB 918MB Modbus RS485 Network I O Modules Key 917MB 918MB Module Features Agency Approvals CE UL amp cUL Listings pending Easy Windows Configuration Fully configurable via our user friendly Windows 95 98 or NT DI 900MB Configuration Program RS485 Modbus Network Interface This proven high speed interface is highly immune to noise can operate over long distances and allows a large number of modules to be networked together The unit communicates using the industry standard Modbus command response protocol Nonvolatile Reprogrammable Memory This module has an advanced technology microcontroller with inte grated non volatile downloadable flash memory and EEPROM This allows the functionality of this device to be reliably reprogrammed thousands of times Fully Isolated Output circuitry network amp power are isolated from each other for safety and increased noise immunity Discrete Outputs High voltage high current open drain mosfets provide direct control of external devices Outputs may be activated independently or under watchdog timeout control Flexible Process Current Output DI 917MB Generates up to four process current signals in three ranges Flexible DC Voltage Output DI 918MB Generates up to four DC voltage signals in three ranges Watchdog Timer An output watchdog timer function is included and may be configured for timeo
78. print the help screen while it is being displayed The following sections review the configuration of a Model DI 918MB transmitter module Configuration of your module will be similar Creati ng A Co nfig u ration Fi le if Series 900MB Configuration 917MB 0900 Untitled File Module Settings Help You may use File New to create anew config lale uration file or File Open to open an existing General Watchdog Reset State 0 amp 1 Watchdog Reset State 2 amp 3 Test Output Cal configuration file You may also use Module ouis Upload Configuration to retrieve the current Rosas ete eres active configuration from the module con Tag Comment nected recommended Configured By Location Uploading first is recommended as it will Sie ps 247 z Baud Aate 3600 m None automatically detect the correct model con Channel 0 Range 0 20mADC m Channel 1 Range 0 20m4DC v d and load the property sheets for that Channel 2 Range 020m DC Channel 3 Range 020m DC model Response Delay o Watchdog Timeout o F Watchdog Rese Once you create open or upload a configura Dena mof pez tion file a screen similar to the one shown at right will be displayed The model number is indicated at the top of the screen along with the current file name The Model DI 917MB Configuration screen is shown here Your screen will vary according to your model number
79. put unaffected Default 0 by a watchdog timeout 40015 14 000E CH2 Output Config Bits 15 2 Zero uration DI 917MB Bits 1 0 I Output Range Default 0 0 20mA 00 0 0 20mA 0l 1 4 20mA 102220 1mA 11 Reserved Note that the 0 20mA range may not precisely go to the OmA end point It will typically approach OmA within 0 1 40015 14 000E CH2 Output Config Bits 15 2 Zero uration DI 918MB Bits 1 0 V Output Range Default 0 0 10V 00 0 0 10V 012120 5V 10 2 0 1V 11 Reserved 40016 15 OOOF CH 3 Output Value Percentage 2 Default 0 40017 16 0010 CH 3 Timeout Value Percentage Write 32767 7FFFH to leave output unaffected Default 0 by a watchdog timeout 40018 17 0011 CH3 Output Config Bits 15 2 Zero uration DI 917MB Bits 1 0 I Output Range Default 0 0 20mA 00 0 0 20mA 01212 4 20mA 102220 1mA 11 Reserved Note that the 0 20mA range may not precisely go to the OmA end point It will typically approach OmA within 0 1 40018 17 0011 CH3 Output Config Bits 15 2 Zero uration DI 918MB Bits 1 0 V Output Range Default 0 0 10V 00 20 0 10V 012120 5V 10 2 0 1V 11 Reserved 40019 18 0012 Calibration Access Writing 24106 SE2AH here immediately removes write protec And tion from the calibration registers that follow other values Alternate Method of apply write protection to the calibration registers except 41429 Module Reset Writing 41429 A1DSH to t
80. resolution limits of the output sub ranges may make it difficult to accurately adjust the output level to the ideal range endpoints especially for 0 1mA and 0 1V output ranges The inability to precisely attain endpoint values will increase total error at the endpoints 5 An Introduction to Modbus provides a description of the Modbus protocol and the Modbus functions that apply to this model Module Configuration 21 Model 917MB 918MB Modbus RS485 Network I O Modules 5 An Introduction to Modbus The Modbus protocol provides an industry standard method that Series DI 900MB modules use for parsing mes sages Modbus devices communicate using a master slave technique in which only one device the master can ini tiate transactions called queries The other devices slaves respond by supplying the requested data to the master or by taking the action requested in the query The Series DI 900MB modules are slaves while a typical master device is a host computer running appropriate application software Masters can address individual slaves or can ini tiate a broadcast message to all slaves Slaves return a response to all queries that are addressed to them individually but no response is returned to broadcast queries from a master device Remote Terminal Unit RTU Mode The Series DI 900MB modules use the widely accepted Modbus network protocol in the Remote Terminal Unit serial transmission mode In RTU mode each 8 bit messag
81. restore a module s original factory output calibration IMPORTANT Checking the Calibration Enable box will automatically set the DI 917MB output range to 0 20mA as all channels are calibrated using the 0 20mA output range a low calibration value of 4mA and a high calibration value of 20mA On DI 918MB units the output range is set to 0 10V the low calibration value is OV and the high calibration value is 10V The calibration of other output ranges is calculated internally and based on these endpoints As such if you are using any other output range you will need to reselect it from the General Page then download your configuration again after calibrating the outputs via this software The slide control at the top of the screen is used to adjust the output signal of the Calibrate Enabled output channel Simply drag the Min Max slide control with your mouse until the output signal is equivalent to the Calibration Value indicated Use the right and left arrow keys of your keyboard to make fine adjustments and increment or decrement the output signal as required Click on the corresponding Low or High Calibrate button to set the respective end point a reset will occur For best results you must measure the output signal via an external current or volt meter that is at least as accurate as the module itself There are four output channels on this module You may follow this procedure to select measure and calibrate each output channel s
82. rrants the instruments described in this manual to be free from defects in materials and factory workmanship to the original buyer This warranty is contingent upon proper use of the equipment and does not cover equipment that has been modified or has been subjected to abusive physical or electrical stresses DATAQ Instruments Inc agrees to repair or replace at its sole discretion any instrument that fails to perform as specified within 18 months after date of the original shipment from the factory or 12 months after the date of installation whichever date comes first DATAQ Instruments Inc reserves the right to make substitutions and modifications in the specifications of equip ment that do not materially or adversely affect the performance of the equipment New equipment may be returned within 30 days of shipment with prior factory approval and upon the assignment of a Returned Material Authorization number RMA number by DATAQ Instruments Inc This number must be clearly shown on the return package s RMA numbers are valid for 30 days from date of issue New items in factory sealed containers which are less than thirty days old after shipment may be returned for credit less a minimum restocking and testing charge of twenty percent of the list price upon factory approval only provided the customer pays all ship ping and handling charges Specially ordered or modified goods or goods which have been used or have been unpacked from the fac
83. s 15 2 Zero DI 917MB Bits 1 0 Output Range 00 2 0 2 0 20mA 01 1 4 20mA 10 2 0 1 11 3 Reserved 30002 1 0001 CHO Status Value Bits 15 2 Zero DI 918MB Bits 1 0 V Output Range 00 0 0 10V 012120 5V 10 2 0 1V 11 Reserved 30003 2 0002 CHI Status Value Format Is Same As CH 0 30004 3 0003 CH2 Status Value Format Is Same As CH 0 30005 4 0004 CH3 Status Value Format Is Same As CH 0 30006 5 0005 CHO Raw Count Raw DAC Count Value See Module Calibration 30007 6 0006 CHI Raw Count Raw DAC Count Value See Module Calibration 30008 7 0007 CH2 Raw Count Raw DAC Count Value See Module Calibration 30009 8 0008 CH3 Raw Count Raw DAC Count Value See Module Calibration Holding Registers dx References Read Write 40001 0 0000 Slave Address 1 247 Default 247 40002 1 0001 Baud Rate 0 2400bps Default 2 1 4800bps 9600bps 2 9600bps Default 3 14400bps 4 19200bps 5 28800bps 6 38400bps 7 576006 8 76800bps 9 1152006 40003 2 0002 Parity 0 No Parity Check Default 0 None 1 Odd Parity Checking 2 Even Parity Checking 40004 3 0003 Output Watchdog Can be set from 1 to 65534 seconds Set to 65535 FFFFH or 0 Time Default 0 Dis 0000H to disable the watchdog timer abled Module Configuration 18 Model 917MB 918MB Modbus RS485 Network I O Modules Ref Addr Description Data Type Format 40005 4 0004 Digita
84. s se deste ert ea ee Lebe ep eth e Orio ir eadera 25 Read Input Registers 04 eoe e Oa o pe eec aepo 26 Force Smegle Coll OS eoe edidere needed ete e en E PE Ee ees 26 Preset Single Reeister 06 to e pepper vast as eines 27 Force Multiple Cons ALI V iore er terr rte eei tb iei esee 27 Preset Multple Reegisters 16 tetti mee e tee ete b eese 28 Report Slave ID T 5n ies en eere e Peete et te erstes 29 Reset slave 08 six oie ete debet 30 Modbus Field ioo ot e nes era tente E cial ass 30 Supported Data Ty pes i oce duse ettet f foede Peter fe e ete te ed erga ertet ger tud 30 Modbus Error Checking Fields 2 1 icti ee e e di Reed ie eee Lee e esee 31 Parity e debet cbe edat 31 Table of Contents Model 917MB 918MB Modbus RS485 Network I O Modules CRC Error Checkinb 2 uere Ebert rear e Bel dete ete ade dene tte 31 Modbus EXceptions 1 ded e dn e ee De Dee 32 6 Module Software Configuration ccce rece eee ee ee seen esa anos ease eaae ena ea eo esos sa aoPeaa e eene seen e eec 33 Betor You B gtn i eise edd eo uta a eade ette gei dettes 33 Startins Phe Programi eet eden etes a 34 File nitrate et e HE o erdt tet Pei E aad aac ne E oe eterne 34 EE 34 C 34 et
85. sed to trigger a reset of the module and its effect is equiva lent to a power on reset An alternate method of resetting a module can be accomplished via a write to the Calibration Access amp Reset Register This is provided to accomplish reset with software that does not support the Reset Slave command Select valid slave addresses in the range of 1 247 01H F7H Address 247 is the default mode address Select 2400 4800 9600 default 14400 19200 28800 38400 57600 76800 or 115200 bits per second Select Even Odd or No Parity See Parity Checking error checking Odd or even parity bit is followed by 1 stop bit Two stop bits are used if no parity is selected Can be set from 0 65500 ticks 1 tick 1 085us and refers to the additional delay a module will wait before it sends its response to a message from the host Some signal converters or host software systems cannot accept a response to a message immediately after sending the message without addi tional delay The Module Status Register can be used to determine internal flash or EEPROM checksum error status A watchdog timer may be applied to the output channels of this module Use the Watchdog Time Register to select a timeout period from 1 to 65534 seconds 18 2 hours A time of 65535 FFFFH or 0 0000H will disable the output watchdog timer Use the Timeout States Register to define the states that the outputs of the port are to be programmed to upon output timeout
86. selection enter 0 for 0 4mA output value or 20000 for a 100 20mA output value NOTE The module always uses percent of span units as described above Translation to milliamp mA indication in the Value field is done via this software Keep this in mind when using other software packages to read or write values to a module Note also that Value is computed via this software and may not represent the actual output reading it is not a read value If polling is OFF then the last transmitted values are indicated If the module is not connected or powered then an Unable to communicate with module message is displayed You can write a value to the output by typing a percent of span value into the corresponding field box and then click ing on the adjacent Write button Click buttons are also provided for each digital output Click the button to turn the output ON sinking current or click the Off button to turn it OFF open The actual state of the output is indicated in the Digital Output States section on the left side of the screen The current state is also indicated via the yellow Digital Output LED s of the module graphics If you miscalibrate a module or your calibration appears in error you can use the Restore Default Calibration but ton to restore a module s original factory output calibration all outputs are restored together Print Your Configuration If you wish to document your transmi
87. sh to exit the DATAQ installation program and return to Windows 10 To run the configuration software go to the Start Menu and click on Programs gt 900 gt Series900MB Configuration this is the default if you did not keep the default settings choose the program folder and direc tory you had specified during installation Getting Started 16 Model 917MB 918MB Modbus RS485 Network I O Modules 4 Module Configuration This module needs to be configured for your application Configuration is easily accomplished using the Windows 95 98 or NT Modbus Configuration Software and an RS232 to RS485 signal converter It is not required to use the DATAQ software to communicate with the Series DI 900MB as any software capable of sending Modbus network protocol commands over an RS485 network can be used However the Configuration Software does provide an easy to use Windows format for communicating with the module that does not require advanced familiarity with the Mod bus protocol Register Map Modbus registers are organized into the following reference types identified by the leading number of the reference address Reference Description Oxxxx Read Write Discrete Outputs or Coils A Ox reference address is used to drive output data to a digital output channel 1xxxx Read Discrete Inputs The ON OFF status of a 1x reference is controlled by the corre sponding digital input channel 3xxxx Read Input Regi
88. shing ON OFF indicates unit is performing diagnostics first sec ond following power up or has failed diagnostics after a few seconds Status Yellow Flashing ON OFF indicates the module is in the default Com munication Mode Upon watchdog timer timeout this LED will flash rapidly and may temporarily mask default mode indication Output Yellow One per open drain output OFF if output switch is OFF open ON if output switch is ON sinking current Software Configuration Units are fully reprogrammable via our user friendly Windows 95 989 or NT 900MB Configuration Program See Drawing Network Connections 4501 805 The following transmitter attributes are configurable via the DI 900MB Configuration Software Optionally any software that supports the Modbus command response protocol may be used Use the Preset Single Multiple Register functions to write configuration data to the appropriate regis ter s as required by your application see Register Map Specifications 9 Model 917MB 918MB Modbus RS485 Network I O Modules Slave Communication Slave ID Slave Reset Slave Address Slave Baud Rate Slave Parity Slave Response Delay Slave Status Slave Watchdog Analog Output Output Range Type Output Timeout Value Output Calibration The Report Slave ID command will return the model number run on off status module serial number and firmware number This command is u
89. ss 247 F7 Function Code 16 10 Function Code 16 10 Starting Register High Order 0 00 Starting Register High Order 0 00 Starting Register Low Order 0 00 Starting Register Low Order 0 00 Number Of Registers High Order 0 00 Number Of Registers High Order 0 00 Number Of Registers Low Order 3 03 Number Of Registers Low Order 3 03 Preset Data High First Register 0 00 Error Check CRC Preset Data Low First Register 200 C8 Preset Data High Second Reg 0 00 Preset Data Low Second Reg 5 05 Preset Data High Third Reg 0 00 Preset Data Low Third Reg 2 02 Error Check CRC The response simply echoes the query without returning the preset values after the register contents have been preset No response is returned to broadcast queries from a master device Report Slave ID 17 This command returns the model number serial number and firmware number for a slave device the status of the Run indicator and any other information specific to the device This command does not address Register Map regis ters Broadcast transmission is not supported The Report Slave ID query simply sends the slave address and function code with error check CRC as follows Report Slave ID Example Query Report Slave ID Example Response Field Name Example Field Name Example Value Hex Value Hex Slave Address 247 F7 Slave Address 247 F7 Function Code 17 11 Fun
90. sters A 3x reference register contains a 16 bit number received from an external source e g an analog signal 4 Read Write Output or Holding Registers A 4x register is used to store 16 bits of numeri cal data binary or decimal or to send the data from the CPU to an output channel Notes 1 The x following the leading character represents a four digit address location in user data memory The lead ing character is generally implied by the function code and omitted from the address specifier for a given func tion The leading character also identifies the I O data type 2 The ON OFF state of discrete inputs and outputs is represented by a 1 or 0 value assigned to an individual bit in a 16 bit data word This is sixteen Ox or 1x references per data word With respect to mapping the LSB of the word maps to the lowest numbered channel of a group and channel numbers increase sequentially as you move towards the MSB Unused bits are set to zero Modbus functions operate on register map registers to configure and control modules The following table outlines the register map for Model DI 917MB and DI 918MB network I O modules You will find it helpful to review this map as you review the Modbus function descriptions Ref Addr Description Data Type Format Coil Registers 0x References Read Write 00001 0 3 Four Discrete Out Discrete Output Value Addresses a specific bit of a 16 bit word Thru
91. to the one shown at ri ght General Watchdog Reset State 0 amp 1 Watchdog Reset State 2 amp 3 Note Calibration of the analog output Min Channel Output Max has already been done on your module A EYE ae Output 2 M E E at the factory Recalibration is normally Range 0 20mADC Range 0 20mADC Range 0 20mADC Range 0 20mADC not required except as necessary to cor Calibrate Enable Calibrate Enable Calibrate Enable Calibrate Enable ee kaw Low r Low i rect for long term component aging or Calibration Value Calibration Value Calibration Value Calibration Value to satisfy your company s maintenance 40000 40000 mapel 0000 mapc 40000 requirements Galibrate Galitrate Balibrate i ibrati i High High m High r High 34 a st us Calibration Value Calibration Value Calibration Value Calibration Value c n h a J rate ih E libr i e 200000 200000 mapc 230000 290000 output channel you wish to calibrate Calibrate salibrate Galibrate This will cause the output controls slide 2 eue EM catia control and the right amp left arrow key board keys to control only the output For Help press F1 COM2 MODULE channel of interest If you miscalibrate a module or your calibration appears in error you can use the Restore Default Calibration but ton of the Test page to
92. tory sealed containers or goods which have been shipped more than thirty days prior are not returnable The information contained in this manual is subject to change without notice DATAQ Instruments Inc makes no warranty of any kind with regard to this material including but not limited to the implied warranties of merchant ability and fitness for a particular purpose Further DATAQ Instruments Inc assumes no responsibility for any errors that may appear in this manual and makes no commitment to update or keep current the information contained in this manual Service Policy Units within the warranty period returned for repair test and recalibration are serviced at no charge in accordance with the terms of the warranty policy The Customer pays all transportation and other charges to the factory Units out of warranty returned for repair test and or recalibration are handled on a time and material basis If requested or if costs exceed 50 of current list price DATAQ Instruments Inc advises the customer prior to making the repairs Such repairs are performed at the customer s expense Typical test recalibration and repairs are 25 of the instrument s current list price Transportation charges both ways are at the customer s expense Please be sure all returns are shipped with the following information included 1 Returned Material Authorization RMA number clearly shown on each package Please call DATAQ Instru ments
93. tput channels plus four digital output channels via an isolated RS485 network I O path utilizing the industry standard Modbus protocol The Model DI 917MB drives four channels of process current while the DI 918MB drives four channels of voltage output signals Both models also include four control outputs for simple ON OFF control of external devices The DI 917MB DI 918MB modules contain an advanced technology microcontroller with integrated downloadable flash and EEPROM memory for non volatile program configuration calibration and parameter data storage Units are fully reconfig urable via our user friendly Windows 95 989 or NT Configuration Program and the RS485 interface or other com patible Modbus software Once configured these modules may operate as an active RS485 network slave connected to other modules and a host computer Each module provides four isolated analog outputs for DC process current or voltage signals The module uses four 12 bit DAC s to generate separate channel voltage signals In addition four open drain mosfets provide discrete con trol of external devices Outputs may be automatically programmed to user defined levels or states following a watchdog timer timeout The open drain outputs include yellow LED s at the front of the module that provide visual indication of output state Additionally a green and yellow Status LED provide local feedback of operating mode system diagnostics watchdog st
94. ts 20mA Available ranges will vary according to your model number output ranges have been factory calibrated To begin configuring your module start by selecting an output range as required Use the Watchdog Time field to specify a watchdog period up to 65534 seconds 18 2 hours 0 or 65535 will dis able the watchdog function Check the Watchdog Reset box to optionally set the output channels to specific states or levels following a watch dog timeout see following page Module Software Configuration 36 Model 917MB 918MB Modbus RS485 Network I O Modules The next section covers Watchdog Timeout Value Configuration for the output channels of this model Note that you can only make changes to the parameters of the following page if you have configured a Watchdog Timeout delay and checked the Watchdog Reset box as described above Watchdog Timeout States if Series 900MB Configuration 917MB 0900 Untitled Values File Module Settings Help Click on the Watchdog Timeout State 0 amp SICA ve gt 1 or Watchdog Timeout State 2 amp 3 prop atchdog Timeout State 2 amp 3 Test Output Cal erty sheet tabs and a screen similar to the one p Watchdog Setup at right will be displayed The Model DI Output 0 Range 0 20m4DC 917MB watchdog screen is shown here Digital Output Watchdog Timeout Value Model DI 918MB screen is similar Analog Output Watchdog Timeout Va
95. tter configuration then select File Print to get a two page printout of all of your selected configuration parameters Module Software Configuration 38 Model 917MB 918MB Modbus RS485 Network I O Modules Saving Your Configuration You should select File Save As to save your configuration file to disk and give it a new file name Use File Save to save the current file without renaming it Note that the currently loaded configuration file name is indicated at the top of the screen to the right of the model number In the event that you lose a configuration file you can always upload it from the module via Module Upload Config uration Note that the configuration process may vary slightly for other model types Now wasn t that easy That s all there is to using the configuration software to configure your module The module is now ready for installation in the field The next section covers output calibration of your module Note that calibration has already been done at the factory and readjustment is not generally required However periodic recalibration may be performed to correct for compo nent aging or as part of your company s maintenance requirements Output Calibration if Series 900MB Configuration 917MB 0900 Untitled File Module Settings Help Selecting the Output Cal property sheet DE SIA will display a screen similar
96. ut periods up to 65534 seconds 18 2 hours Timer will timeout if a read or write operation to any I O channel does not occur over the configured time period Outputs may be automatically set to user defined levels or states following a watchdog timeout Self Diagnostics Built in routines operate upon power up for reliable service easy maintenance and trouble shooting A watchdog timer is also built into the microcontroller that causes it to initiate a self reset if the con troller ever locks up or fails to return from an operation in a timely manner High Speed Data Rates Supports RS485 communication rates up to 115K baud Wide Range DC Power or 24VAC Power This device receives power over a wide supply range and the power terminals are diode coupled This makes this transmitter useful for systems with redundant supplies and or battery back up Additionally the power terminals are not polarized Wide Ambient Operation The unit is designed for reliable operation over a wide ambient temperature range Hardened For Harsh Environments The unit will operate reliably in harsh industrial environments and includes protection from RFI EMI ESD EFT and surges plus low radiated emissions per CE requirements Convenient Mounting Removal amp Replacement The DIN rail mount and plug in type terminal blocks make module removal and replacement easy High Resolution Precise D A Conversion Transmitters include high resolution low
97. v ing device assumes it is a continuation of the previous message This will generate an error as the value in the final CRC field will not be valid for the combined messages How Characters Are Transmitted Serially When messages are transmitted on Modbus serial networks each character or byte is sent in the order of Least Signif icant Bit LSB to Most Significant Bit MSB as outlined below moving left to right Note that an additional stop bit is transmitted to fill out the character frame for no parity RTU Character Framing No Parity Start 0 1 2 3 4 5 6 7 Stop Stop RTU Character Framing With Parity Start 0 1 2 3 4 5 6 7 Parity Stop Modbus Addresses The master device addresses a specific slave device by placing the 8 bit slave address in the address field of the mes sage Valid addresses are from 1 247 When the slave responds it places its own address in this field of its response to let the master know which slave is responding Address O is reserved for the broadcast address which all slave devices on a network recognize A slave does not issue a response to broadcast messages Further not all function messages support the broadcast address With respect to data addresses all data addresses in Modbus messages are referenced to 0 with the first occurrence of a data item addressed as item number zero Further a function code field already specifies which register group
98. ve device responds to the master it uses the function code field to indicate either a normal error free response or that some kind of error has occurred an exception response A normal response simply echoes the orig inal function code of the query while an exception response returns a code that is equivalent to the original function code with its most significant bit msb set to a logic 1 For example the Read Holding Registers command has the An Introduction to Modbus 24 Model 917MB 918MB Modbus RS485 Network I O Modules function code 0000 0011 03H If the slave device takes the requested action without error it returns the same code in its response However if an exception occurs it returns 1000 0011 83H in the function code field and also appends a unique code in the data field of the response message that tells the master device what kind of error occurred or the reason for the exception See Modbus Exceptions The master s application program must handle the exception response It may choose to post subsequent retries of the original message it may try sending diagnos tic messages to the slave or it may simply notify the operator an exception error has occurred The following paragraphs describe the Modbus functions supported by the Model DI 918MB To gain a better under standing of Modbus please refer to the Register Map as you review this material Read Coil Status 01 This command will read the ON OFF status of
99. ware makes getting started easier All module functions are programmable and downloadable to the modules via this software The software also includes on line help Non volatile memory provides program and configuration storage within the module RS 232 to RS 485 Serial Adapter This device is a non isolated port powered signal converter for communication between the RS 232 serial port of a personal computer and the RS 485 network interface of Series DI 900MB I O Modules It is used in conjunction with the DI 900MB Configuration Software for simple reconfiguration testing and troubleshooting of Series DI 900MB I O modules As a port powered device it is not intended for driving fully loaded RS 485 networks over long distances and does not have sufficient power to drive terminated networks The adapter has DB 9F connectors at both ends and plugs directly into the common DB 9M serial port connector of most personal computers The mod ule is connected to the RS 485 side of this adapter via a separate interconnecting cable see Interface Cable described below Interface Cable This 3 wire cable is used to connect the RS 485 side of the Serial Adapter to the RS 485 network terminals of Series DI 900MB modules This cable is 8 feet long and has a DE 9M connector on one end and three stripped and tinned wires on the other end The wires are labeled A B and C for connection to the module D Dbar and COM terminals respectively Isolated Signal Co
100. ws communication with a module when its address baud rate and parity settings are unknown Non volatile reprogrammable memory in the module stores calibration and configuration information Model Number Definition Transmitters are color coded with a white label The prefix 9 denotes the Series 900 while the suffix spec ifies that this device is primarily a process transmitter for Modbus networks DI 917MB Transmits up to four DC current output channels plus four digital outputs DI 918MB Transmits up to four DC voltage output channels plus four digital outputs 0900 The four digits of this model suffix represent the following options respec tively 0 No Options 9 z Output RS485 Modbus 0 Enclosure DIN rail mount 0 Approvals Pending CE UL Listed and cUL Listed Analog Output Specifications Each output channel of these models includes a 12 bit DAC Digital to Analog Converter that drives a voltage to current converter DI 917MB model or voltage amplifier DI 918MB model The unit must be wired and config ured for the intended output type and range see Module Installation for details The unit can be easily reconfigured to accept any one of the output ranges described below using the Modbus Configuration Program Analog outputs go to their minimum levels following a software or power on reset of the module but may be optionally sent to user defined levels following a watchdog timer timeout The
101. y overall system design It is agreed between the Buyer and DATAQ Instruments Inc that this is the Buyer s responsibility Model 917MB 918MB Modbus RS485 Network I O Modules Table of Contents Warranty and Service Polity sisccccedscscicdsesccoctsssoncsesccvsctssonssesocvsssedensstevensdssccosteseuasseseesesesecsssesecssseeesstess iii III M 1 IpIfesieston E 1 Key 917 918 Module Features 2 VIRES TOME TE BT T REEL TEE Emm 3 Gromer eas 3 Model Number Definition 3 Analog O tput Specifications s iecit etse eei tete beer ie cepit cue dee Ene gud 3 Digital Output Specifications 5 eee ure ebbe doe eG 5 Enclosure Physical Specifications nennen nnne 6 Approvals XXX0 i ien Pe PE er SEE ERE RC EUM o e EP Dele 6 Environmental SpecifiCatlOns teni ert lade He pe La 6 Communication Interface Specifications essen ene nennen nennen 8 Configuration and Controls t iier icone epe ete e epe a Perte b eot Ce Hp potete pen eade 9 Software s cade p ie et ripe ie i eee eet gebe 9 Other Modbus Configuration Software Capabilities
102. y Map Note that you will have to write 24106 into the Calibration Access register to be able to modify the Cal High Low registers This process is repeated for the opposite calibration point After writing the required values to the Cal Low amp Cal High registers of the output the new output calibration will take effect immediately following a module reset For best results allow some settling time between Low amp High calibration and always calibrate the low calibration point first Output Calibration Values For DI 917MB DI 918MB Output Factory Calibration LOW Point Range Output Output 96 DAC Count 0 20mA 4 000mA 4000 723 0 10V 0 000V 0 50 Output Factory Calibration HIGH Point Range Output Output DAC Count 0 20mA 20 000mA 20000 3614 0 10V 10 000V 20000 3609 Note that DI 917MB units have the 0 20mA output range selected during calibration while DI 918MB units have the 0 10V output range selected during calibration The output value and DAC count of the table are based on ideal conditions and will only approximate random selected performance IMPORTANT Because calibration of the module s sub ranges are interpolated based on the primary range calibra tion noted above and because resolution is degraded for the sub ranges it is very important that high accuracy be ensured for the primary range calibration when making output adjustments and measuring the output levels Further

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