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1746-UM022B-EN-P, SLC 500 Thermocouple

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1. y i Channel Channel Channel Module Status Module Status anne Status LED s Status LED s Status LED s LED s off LED s off flashing s s im i i y Y Module fault Normal Y hannel Channel condition module Fault is i EUA is enabled and operation condition f working l y Check to see that End Enable channel if module D m m desired by setting properly in channel config chassis Cycle bre word bit 0 1 power or thermocouple Retry input End Thermocouple n Is more than No one LED blinking Check channel status words bits CJC fault has 12 through 15 probabl Channel error Check occurred configuration word bits 1 through 4 for valid input Bit15 type configuration and gt set 1 ensure bits 12 through 14 Check that wiring is secure are set to zero Retry at both CJCs and that the temperature within the enclosure is in the range Over range condition exists limits of the CJC sensor The input signal is greater Yes Bit 14 thank the high scale limitfor set 1 1 the channel or the CJC connections Corret and Is problem retry corrected Is problem corrected Under range condition exists The input signal is less than the low scale limit Bit i gt for the channel o
2. Cable Tie Slots j b ES A DOT mu a i a Jumper Do not move Self Locking Tabs Hardware Features Hardware Function Channel Status LED Indicators Display operating and fault status of channels 0 to 7 Module Status LED Displays operating and fault status of the module Side Label Nameplate Provides module information Removable Terminal Block Provides electrical connection to input devices Door Label Permits easy terminal identification Cable Tie Slots Secure and route wiring from module Self Locking Tabs Secure module in chassis slot Diagnostic LEDs The module contains diagnostic LEDs that help you identify the source of problems that may occur during power up or during normal operation Power up and channel diagnostics are explained in Chapter 6 Testing Your Module The module communicates with the SLC 500 processor and receives 5V dc and 24V dc power from the system power supply through the parallel backplane interface No external power supply is required You may install as many thermocouple modules in the system as the power supply can support Publication 1746 UM022B EN P January 2005 1 4 Module Overview Publication 1746 UM022B EN P January 2005 Each module channel can receive input signals from a thermocouple or a mV analog input device You configure each channel to accept either one When configured for thermocouple input types the module
3. A A Configure Channel for x Channel E Enable Bit e Type K Thermocouple Input e Engineering Units X 10 e Zero if Open Circuit e Fahrenheit e 10 Hz Filter Frequency e Not Used e Data Word The following procedure transfers configuration data and sets the channel enable bits of all eight channels with a single File Copy instruction Publication 1746 UM022B EN P January 2005 5 2 Programming Examples Data table for initial programming Data File N10 bin NT 8 Configuration Procedure 1 Create integer file N10 Integer file N10 should contain eight elements N10 0 through N10 7 2 Using the programming software enter the configuration parameters for all eight thermocouple channels into data file locations N10 0 through N10 7 Offset 15 10 0 10 1 10 2 10 3 10 4 10 5 10 6 10 7 222 2 2 2 2 2 14 OO c O O OO O 13 OO c O O O c cC 12 OO c O O OO c 0000 0001 1 10 9 O OO O O OOO OO c O O OO O al D c c c O OOOO O O c O O O O O OO c c c c c c CO OO c c c O c c Am OO c c O OOO sg O O c c O O c c N 0 Symbol Description 3 Program a rung in your ladder logic to copy the contents of integer file N10 to the eight consecutive output words of the thermocouple module beginning with O 3 0 Initial programming example During the first pass send the channel configuration data to
4. CJCA Sensor ungrounded a2 thermocouple ME 4 0 Shield Qi to or Within 12 5V eH Shield Q4i 0 rounded p thermocouple e Y Shield gl xm 0 d 0 Shield os 0 CJCB Sensor 4 Digital Value TIN When using multiple thermocouples the potential between any two channels cannot exceed the channel to channel differential voltage 12 5 volts For more information see Appendix B Publication 1746 UM022B EN P January 2005 Module Overview 1 7 Linear Millivolt Device Compatibility A large number of millivolt devices may be used with the 1746 NT8 module For this reason we do not specify compatibility with any particular device However millivolt applications often use strain gage bridges A resistive voltage divider using fixed resistors is recommended for this application The circuit diagram below shows how this connection is made Strain Gage Bridge Denm i variable 1746 NT8 ifixed l Channel iy i Input tO omm i i fixed fixed TIP The resistors should be selected to ensure that the differential input voltage is less than or equal to 100 mv 1 Output impedance of input device must be less than 100 ohm to meet accuracy specifications Publication 1746 UM022B EN P January 2005 1 8 Module Overview Publication 1746 UM022B EN P January 2005 Chapter 2 Electrostatic Damage Installing And
5. 0 10 20 30 40 50 60 Hz 2 62 Hz Signal Frequency Signal Attenuation with 50 Hz Input Filter 3dB 0r 20 40 60 80 2 Amplitude in dB 100 120 140 160 180 200 0 50 100 150 200 250 300 Hz 13 1 Hz Signal Frequency Publication 1746 UM022B EN P January 2005 3 6 Considerations Before Using Your Module Signal Attenuation with 60 Hz Input Filter 3dB e Up 20 40 60 80 100 120 140 160 180 200 r Amplitude in dB 0 60 120 180 240 300 360 Hz 15 7 Hz Signal Frequency Signal Attenuation with 250 Hz Input Filter 3dB 0r 20 40 60 80 100 120 140 160 180 200 2 Amplitude in dB 0 250 500 750 1000 1250 1500 Hz 65 5 Hz Signal Frequency Channel Step Response The channel filter frequency determines the channel s step response The step response is time required for the analog input signal to reach 95 of its expected final value given a full scale step change in the input signal This means that if an input signal changes faster than the channel step response a portion of that signal will be attenuated by the channel filter The table on page 3 4 shows the step response for each filter frequency Publication 1746 UM022B EN P January 2005 Update Time Enabled Considerations Before Using Your Module 3 7 The thermocoupl
6. Channel 7 Channel Data Status Word i I 1 I J L I 1 1 J Publication 1746 UM022B EN P January 2005 4 12 Channel Configuration Data and Status Channel Status Checking Channel 0 to 7 Status Word I e 0 through l e 7 Bit Definitions To Select You can use the information provided in the status word to determine if the input configuration data for any channel is valid per your configuration in O e 0 through O e 7 The channel status can be analyzed bit by bit In addition to providing information about an enabled or disabled channel each bit s status 0 or 1 tells you how the input data from the thermocouple or millivolt analog sensor connected to a specific channel will be translated for your application The bit status also informs you of any error condition and can tell you what type of error occurred A bit by bit examination of the status word is provided in the chart on the following page Make these bit settings 1 14 13 12 11 10 Channel Channel Disable Status Channel Enable Input Type Thermocouple J Thermocouple K Thermocouple T Thermocouple E Thermocouple R Thermocouple S Thermocouple B Thermocouple N 50 to 50 mV 100 to 100 mV Invalid Invalid Invalid Invalid Invalid gt gt gt gt ol ol ol ol ol ol ol o ol ol ol ol ol ol ol o CJC
7. During 1st program scan copy thermocouple channel configuration words N10 0 N10 7 to NT8 In addition initialize channel error registers N10 20 N10 27 and Error Flags B3 119 NT8_CH_CNF S 1 COP JE Copy File 15 Source N10 0 Dest 0 1 0 Length 8 NT8_CHO_STS_FLAGS FLL m Fill File Ee Source 0 Dest N10 20 Length 8 CLR Clear HH Dest B3 7 0000000000000001 lt If the NT8 is not checking channel status store the thermocouple readings in the NT8 last channel reading registers N10 37 These registers should be used in the remainder of the program e g for NT8 1 0 image location NT8 CHECKING STS emperature control instead of the 3 NT8 LAST TEMP READ B3 6 COP t Copy File o 4 Source 1 1 0 Dest N10 30 Length 8 T11 0 is a repeating 60 second timer which initiates the NT8 channel status check NT8 STS CHECK TMR DN NT8 STS CHECK TMR T11 0 TON Mt Timer On Delay t CEN DN Timer T11 0 Time Base 10 DN Preset 60 Accum 10 Every 60 seconds initiate a NT8 channel status check by latching the NTB channel status checking bit and copying the Status check configuration words N10 10 N10 7 to the NT8 configuration words NT8 STS CHECK TMR DN NT8 CHECKING STS T11 0 B3 6 E uw DN 4 SNTS CH CNF COP Copy File Source N10 10 Dest 0 1 0 Length 8 After copying the Status Check configuration words start a 7 second timer T11
8. Publication 1746 UM022B EN P January 2005 2 4 Installing And Wiring Your Module General Considerations Publication 1746 UM022B EN P January 2005 When using the BAS or KE module to supply power to a 1747 AIC Link Coupler the link coupler draws its power through the module The higher current drawn by the AIC at 24V dc is shown in the table as BASn BAS networked and KEn KE networked Be sure to use these current draw values if the application uses the BAS or KE module in this way Most applications require installation in an industrial enclosure to reduce the effects of electrical interference Thermocouple inputs are highly susceptible to electrical noises due to the small amplitudes of their signal microvolt C Group your modules to minimize adverse effects from radiated electrical noise and heat Consider the following conditions when selecting a slot for the thermocouple module Position the module in a slot away from sources of electrical noise such as recontact switches relays and AC motor drives away from modules which generate significant radiated heat such as the 32 point I O modules In addition route shielded twisted pair thermocouple or millivolt input wiring away from any high voltage I O wiring Remember that in a modular system the processor or communications adapter always occupies the first slot of the chassis Module Installation and Removal Installing And Wiring Your Module 2 5 AT
9. 0 to 95 in 400 ms 10 Hz Display Resolution See Channel Data Word Resolution table on page 4 8 Overall Module Accuracy at 257 C 77 F See Module Accuracy Tables page A 6 Overall Module Accuracy See Module Accuracy Tables page A 6 Overall Module Drift See Module Accuracy Tables page A 6 Module Update Time Dependent upon enabled channels see Update Time page 3 7 Channel Turn Off Time Up to one module update time Publication 1746 UM022B EN P January 2005 A 4 Module Specifications Publication 1746 UM022B EN P January 2005 Overall Accuracy The accuracy of the module is determined by many aspects of the hardware and software functionality of the module The following discussion explains what the user can expect in terms of accuracy based on the thermocouple and millivolt inputs for the 1746 NT8 module The accuracies specified as follows include errors due to the cold junction compensation for thermocouples and hardware and software errors associated with the system The hardware and software errors include calibration of the system and non linearity of the ADC For the sake of the calculations the resolution of the ADC was assumed to be at least 16 bits use of the 10 Hz 50 Hz and 60 Hz filter frequencies TIP The 250 Hz frequency should not be applied to thermocouple inputs See table on page 3 4 Millivolt For millivolt inputs the error is 30 uV typical at 25
10. Select Data Format Bits 5 and 6 The data format bit field lets you define the expressed format for the channel data word contained in the module input image The data types are engineering units scaled for PID and proportional counts The engineering units allow you to select from two resolutions x1 or x10 For engineering units x1 values are expressed in 0 1 degrees or 0 01 mV For engineering units x10 values are expressed in 1 0 degrees or 0 1 mV Use the x10 setting to produce temperature readings in whole degrees Celsius or Fahrenheit The scaled for PID value is the same for millivolt thermocouple and CJC input types The input signal range is proportional to your selected input type and scaled into a 0 through 16 383 range which is standard to the SLC PID algorithm Publication 1746 UM022B EN P January 2005 4 6 Channel Configuration Data and Status Publication 1746 UM022B EN P January 2005 The proportional counts are scaled to fit the defined temperature or voltage range The input signal range is proportional to your selected input and scaled into a 32 768 to 32 767 range Using Scaled for PID and Proportional Counts The thermocouple module provides eight options for displaying input channel data These are 0 1 F 0 1 C 1 F 1 C 0 01 mV 0 1 mV Scaled for PID and Proportional Counts The first six options represent real Engineering Units displayed by the 1746 NT8 and do not require explanation T
11. 3 052uV step 3 052uV step CJC 1 C step 1 F step 1 C step 1 F step 0 0079 C step 0 0143 F step 0 0020 C step 0 0036 F step Sensor Publication 1746 UM022B EN P January 2005 Channel Configuration Data and Status 4 9 TTTIATUE Pata resolution is not equivalent to data accuracy Input accuracy of 50 pV may span multiple steps for PID and Proportional Counts data types As an example a Type B thermocouple temperature range of 0 to 1820 C provides a voltage input range of 0 to 13 82mV to the 1746 NT8 This is a very small input range and when it is scaled to PID or proportional counts ranges a small input change results in many counts being changed Select Open Circuit State Bits 7 and 8 The open circuit bit field lets you define the state of the channel data word when an open circuit condition is detected for that channel This feature can be disabled by selecting the disable option An open circuit condition occurs when the thermocouple itself or its extension wire is physically separated or open This can happen if the wire gets cut or disconnected from terminal block If either of the two CJC devices is removed from the terminal block any input channel configured for either a thermocouple or CJC temperature input is placed in an open circuit condition An input channel configured for millivolt input is not affected by CJC open circuit conditions The results of the data word
12. Chapter 5 PROG QUITS s oV ee URS PCR PE bn DE PTUS Automatic Monitoring Thermocouples and CJC Sensors Verifying Configuration Changes Interfacing to the PID Instruction 23489 2x9 R9 325 Monitoring Channel Status Bits o o ooooo o Monitoring Channel Status Bits Example PLC 5 Example with NT8 in Remote I O Rack SLC 500 Example with NT8 in Remote I O Rack Chapter 6 Module and Channel Diagnostics Module Diagnostics at Powerup 5 Channel Diagnostics wed e ee este i age sles aes pe LED Troubleshooting Tables orm s Channel status LEDs Green vi vade Ries Open circuit Detection Bit T2 c oa yak X eR as Maintaining Your Module And Safety Considerations Module Specifications Using Grounded Junction Ungrounded Junction and Exposed Junction Thermocouples Configuring the 1746 NT8 Module with RSLogix 500 Table of Contents iii Out of Range Detection Bit 13 for Under Range Bit 14 for OVER RANGE oai qnd o Peta ue qr let b red aei 6 4 Channel Frror Bit 15 ei cx dde bx eb 6 5 Module Status LED Green so Cv AA 6 5 Interpreting I O Error Codes oooooooooo 6 5 Chapter 7 Preventive Maintenance 1 ici e CHOC A Pot oe 7 1 Safety Considerations IA CERA NOE NGC eR 7 1 Appendix A Electrical Specifications le one ae nk See ER te A 1 Physical Specifications ota tede ect a A 2 Environmental Spe
13. Source B 0 0 lt NT8_CH6_STS_FLAGS NT8_CH6_STS_FLAGS MVM Masked Move Source 11 6 0 lt Mask OF000h 4096 Dest N10 26 0 lt NT8_CH6_ERROR NEQ B3 7 Not Equal L Source A N10 26 6 0 lt Source B 0 0 lt NT8_CH7_STS_FLAGS NT8_CH7_STS_FLAGS NT8_CH7_ERROR MVM Masked Move Source L1 7 0 lt Mask OF000h 4096 Dest N10 27 0 lt NEQ B3 7 Not Equal CL Source A N10 27 7 0 lt Source B 0 0 lt After updating the error status registers and flags copy the regular NT8 channel configuration words into the NT8 Publication 1746 UM022B EN P January 2005 1 0 image Begin 7 second timer to wait for the NT8 to change its 1 0 image back to the regular channel configuration Again the time required by the NT8 1 0 image is dependent on the NT8 configuration NT8_STS_CNF_TMR DN NT8_CH_CNF TII COP JE Copy File DN Source N10 0 Dest 0 1 0 Length 8 Programming Examples 5 13 After the NT8 has restored its normal 0 image NT8_REG_CNF_TMR DN T11 2 ejr 0008 NT8 REG CNF TMR TON Timer On Delay I END Timer T11 2 Time Base 10 L DN 5 Preset PE Accum 0 lt clear the NT8 checking status bit B3 100 NT8_CHECKING_STS B3 6 UD AE DN 0009 4 PLC 5 Example with NT8 in Remote 0 Rack Remote I O network The writes to communicate
14. selected filter frequency data acquisition or auto calibration errors When the module detects any of the following fault conditions it causes the channel status LED to flash and sets the corresponding fault bit in the channel status word Channel fault bits bits 12 through 15 and channel status LEDs are self clearing when fault conditions are corrected Open circuit Detection Bit 12 If open circuit detection is enabled for an input channel the module tests the channel for an open circuit condition each time it scans its input Open circuit detection is always performed for the CJC inputs Possible causes of an open circuit include broken thermocouple or CJC sensor thermocouple or CJC sensor wire cut or disconnected millivolt input wire cut or disconnected Out of Range Detection Bit 13 for Under Range Bit 14 for Over Range The module tests all enabled channels for an out of range condition each time it scans its inputs Possible causes of an out of range condition include the temperature is too hot or too cold for the thermocouple being used a type B thermocouple may be registering a F value in Engineering Units x1 beyond the range allowed by the SLC processor beyond 32 767 for the data word a CJC sensor may be damaged or the temperature being detected by the CJC may be outside the CJC sensor range limits Interpreting 1 0 Error Codes Troubleshooting Your Module 6 5 Channel Error Bit 15 T
15. 4 Plot current draw at 24V dc 115 mA at 24V dc 5 Note the point of intersection on the chart above marked x This combination falls within the valid operating region for the fixed 1 0 chassis Important The 1747 NO4I and 1746 NO4V analog output modules may require an external power supply Module Current Draw Power Supply Loading 1 0 Module 5V 24V 1 0 Module 5V 24V BAS 150 040 NI4 025 085 BASn 150 125 NI8 200 100 DCM 360 000 NIO4I 055 145 Fl 04 055 150 NIO4V 055 M5 Fl 04V 055 120 N04I 055 195 HS 300 000 NO4V 055 145 HSTP 1 200 000 NOSI 120 250 A4 035 000 N08V 120 160 A8 050 000 NR4 050 050 A16 085 000 NR8 100 55 B8 050 000 NT4 060 040 B16 085 000 NT8 120 70 B32 106 000 0A16 370 000 C16 085 000 0A8 185 000 G16 140 000 OAP12 370 000 H16 085 000 0B8 135 000 4 035 000 0B16 280 000 B 050 000 0B16E 135 000 6 085 000 0832 452 000 N16 085 000 OBP8 135 000 04 030 025 OBP16 250 000 08 060 045 0G16 180 000 012 090 070 0V8 135 000 TB16 085 000 0V16 210 000 TV16 085 000 0V32 452 000 V8 050 000 OVP16 250 000 V16 085 000 0W16 170 180 V32 106 000 0Ww4 045 045 KE 150 040 OW8 085 090 KEn 150 125 0X8 085 090 w jumper set to rack otherwise 0 0 mA
16. Configuration Racks m Current Cards Available 1 174644 4SlotRack Fiter A1 10 z 2 170 RackNotinstaled Z Ea D 3 VG Rack Not Installed Read ID Config Analog 16 Ch Voltage Input Class 3 Se te ADU es Analog 2 Ch In 2 Ch Current Qut Analog 2 Ch In 2 Ch Voltage Out Analog 4 Ch Current Output Analog 4 Ch Voltage Output Analog 8 Ch Current Output Class 1 Analog 8 Ch Current Output Class 3 1 1746 NT8 Analog 8 Ch Thermocouple Input Analog 8 Ch Voltage Output Class 1 Analog 8 Ch Voltage Output Class 3 Analog 4 Ch RTD Resistance Input Analog 8 Ch RTD Class 1 Analog 8 Ch RTD Class 3 Analog 4 Ch Thermocouple Input Analog 8 Ch Thermocouple Input 8 Output TRIAC 100 240 VAC 16 Output TRIAC 100 240 VAC 8 Output Isolated TRIAC 74 276 VAC 12 Output TRIAC 120 240 VAC 6 Output TRANS SRC 24 VDC 8 Output TRANS SRC 10 50 VBC Help Hide All Cards 16 Output TRANS SRC 10 50 VDC 3 Press the Adv Config button The following dialog box appears Publication 1746 UM022B EN P January 2005 C 2 Configuring the 1746 NT8 Module with RSLogix 500 Adv Configuration menu Advanced I 0 Configuration Slot 1 1746 NT8 Analog 8 Ch Thermocouple Input Cancel Maximum Input Words pee Maximum Output Words Help Setup Scanned Input Words Scanned Output Words Interrupt Service Routine ISR 8 MO Length M1 Length Configure
17. MVM Masked Move Source 1 1 2 0 lt Mask OF000h 4096 lt Dest N10 22 0 lt Publication 1746 UM022B EN P January 2005 Programming Examples 5 11 NT8_CH2_STS_FLAGS NT8_CH2_ ERROR NEQ B3 7 Not Equal CL Source A N10 22 2 0 lt Source B 0 0 lt NT8_CH3_STS_FLAGS MVM Masked Move Source E13 0 lt Mask OFO00h 4096 lt Dest N10 23 0 lt NT8_CH3_STS_FLAGS NT8_CH3_ERROR NEQ B3 7 Not Equal CL Source A N10 23 3 0x Source B 0 Ox After waiting for the NT8 to update its 1 0 image check each channel s status error bits by masking off the appropriate bits and checking if these bits are set non zero If an error is detected set the appropriate channel status error bits B3 112 B3 119 Rung 6 checks channels 4 to 7 NT8 CH4 STS FLAGS NT8 STS CNF TMR DN NT8 CHECK FLAGS2 0006 T11 1 B3 6 MVM J E OSR Masked Move DN 6 Source 1 1 4 0 lt Mask OF000h 4096 lt Dest N10 24 0 lt NT8_CH4_ERROR NT8_CH4_STS_FLAGS NEQ B3 7 Not Equal CL Source A N10 24 4 0 lt Source B 0 0 lt NT8_CH5_STS_FLAGS MVM Masked Move Source PIS 0 lt Mask OF000h 4096 lt Dest N10 25 0 lt Publication 1746 UM022B EN P January 2005 5 12 Programming Examples 0007 NT8 CH5 STS FLAGS NT8 CH5 ERROR NEQ B3 7 Not Equal CL Source A N10 25 5 0 lt
18. Trim signal wires to 5 inch lengths beyond the cable casing Strip about 3 16 inch 4 76 mm of insulation to expose the ends of the wires 3 At the module end of the cables extract the drain wire and signal wires remove the foil shield bundle the input cables with a cable strap Connect pairs of drain wires together Channels 0 and 1 Channels 2 and 3 Channels 4 and 5 Channels 6 and 7 Keep drain wires as short as possible 5 Connect the drain wires to the shield inputs of the terminal block if appropriate for thermocouple used Channel 0 and 1 drain wires to pin 5 Channel 2 and 3 drain wires to pin 10 Channel 4 and 5 drain wires to pin 15 Channel 6 and 7 drain wires to pin 20 Publication 1746 UM022B EN P January 2005 2 10 Installing And Wiring Your Module 6 Connect the signal wires of each channel to the terminal block IMPORTANT Only after verifying that your connections are correct for each channel trim the lengths to keep them short Avoid cutting leads too short 7 Connect TB1 chassis ground connector to the nearest chassis mounting bolt with 14 gauge wire Looking at the face of the module TB1 is near the lower part of the terminal block on the primary side of the PCB A Connect ground wire to TB1 jad before installing module 8 At the sensor end of cables from thermocouple mV devices remove the drain wire and foil shield
19. thus it is recommended that when using a channel for CJC sensor acquisition the open circuit selection is enabled Select Temperature Units Bit 9 The temperature units bit lets you select temperature engineering units for thermocouple and CJC input types Units are either degrees Celsius C or degrees Fahrenheit F This bit field is only active for thermocouple and CJC input types It is ignored when millivolt inputs types are selected Wirt If you are using engineering units x1 mode and Fahrenheit temperature units G e 0 1 F the full scale temperature for thermocouple type B is not achievable with 16 bit signed numerical representation An over range error occurs for that channel if it tries to represent the full scale value The maximum representable temperature is 3276 7 F instead of 3308 F Select Channel Filter Frequency Bits 10 and 11 The channel filter frequency bit field lets you select one of four filters available for a channel The filter frequency affects the channel update time and noise rejection characteristics A smaller filter frequency increases the channel update time but also increases the noise rejection and channel resolution A larger filter frequency decreases the noise rejection but also decreases the channel update time and channel resolution Channel Data Status Word Channel Configuration Data and Status 4 11 Guidelines for filter frequency are listed below e 250 Hz setti
20. 0 reserved for the SLC processor or adapter modules When using the module with a modular system add the values shown above to the requirements of all other modules in the SLC to prevent overloading the chassis power supply Refer to the SLC 500 Modular Hardware Style User Manual publication 1747 UM011 Installing And Wiring Your Module Fixed 1 0 Chassis 1 0 Module Compatibility The following chart depicts the range of current combinations supported by the fixed I O expansion chassis To use it find the 2 3 backplane current draw and operating voltage for both modules being used in the chassis These specifications are found in the table alongside the chart Next plot each of the currents on the chart below If the point of intersection falls within the operating region the combination is valid If not the combination cannot be used in a 2 slot fixed I O chassis OW16 and 450 0 455 400 350 300 016 and 416 Current 250 180 255 mA Valid Operating at5Vde 200 Region Plotted from Example Shown Below 150 5 100 50 50 100 150 200 Current mA at 24V Example Plot IN16 and NIO4V IN16 0 085 at 5V dc and 0A at 24V dc NIO4V 0 055A at 5V dc and 0 115A at 24V dc 1 Add current draws of both modules at 5V dc to get 0 14 A 140 mA 2 Plot this point on the chart above 140 mA at 5V dc 3 Add current draws of both modules at 24V dc to get 0 115 A 115 mA
21. 100 mV Deviation Over Temp 0 06 0 04 0 02 I At ey I i i Hh 0 T e Delta 60 C m Delta 25 C a Delta 0 C it aa Tff ih f m i D p jl i 0 1 40000 20000 0 20000 40000 Input Voltage counts uV Err 50mV Span Prop Cts 60 Hz 25 C 50 mV Deviation Over Temp 0 03 0 02 0 01 0 i Delta 25 C 0 01 0 02 0 03 40000 20000 0 20000 40000 Input Voltage counts Degrees C Deviation Module Specifications A 9 Thermocouple J Deviations Over Temperature e Delta 60 C a Delta 25 C Delta 0 C 400 Degrees C Deviation 200 0 200 400 600 800 1000 Degrees C TC Input Thermocouple K Deviations Over Temperature 500 Delta 60 C m Delta 25 C a Delta 0 C 0 500 1000 1500 Degrees C TC Input Publication 1746 UM022B EN P January 2005 A 10 Module Specifications Thermocouple T Deviations Over Temperature 400 200 0 200 400 600 0 2 ge 4i o o Delta 60 C 59 a Delta 25 C o 4 Delta 0 C o 8 A a o a o a 10 42 Degrees C TC Input Thermocouple E Deviations Over Temperature 400 200 0 200 400 600 800 1000 1200 1 T T T T T T T 0 4 S 2 Delta 60 C 3 g Delta 25 C a 3 _ Delta 0 C ral J o 4 D o a 5 6 J Degrees C TC
22. 4 3 If the channel is configured for thermocouple inputs determine if the channel data word should read in degrees Fahrenheit or degrees Celsius and enter a one or a zero in bit 9 of the configuration word If the channel is configured for a mV analog sensor enter a zero in bit 9 Determine the desired input filter frequency for the channel and enter the two digit binary code in bits 10 and 11 of the channel configuration word A lower filter frequency increases the channel update time but also increases the noise rejection and channel resolution A higher filter frequency decreases the channel update time but also decreases the noise rejection and effective resolution Ensure that bits 12 through 14 contain zeros Determine whether the channel input image word should contain data or status Place a one in bit 15 if channel data is desired Place a zero in bit 15 if status is desired Build the channel configuration word for every channel on each thermocouple mV module repeating the procedures given in steps 1 through 8 Enter this configuration into your ladder program and download it to the thermocouple module Publication 1746 UM022B EN P January 2005 4 4 Channel Configuration Word 0 e 0 through 0 e 7 Bit Definitions To Select Channel Configuration Data and Status A detailed explanation appears in the following table Make these bit settings 15 14 13 12 11 10 Channel Enable I
23. Input Publication 1746 UM022B EN P January 2005 Degrees C Deviation Module Specifications A 11 Thermocouple B Deviations Over Temperature 300 800 1300 1800 e Delta 60 C a Delta 25 C a Delta 0 C Degrees C TC Input Thermocouple N Deviations Over Temperature 3 25 2 15 1 e Delta 60 C g Delta 25 C 0 200 400 600 800 1000 1200 1400 4 Delta 0 C Degrees C Deviation ce c 45 Degrees C TC Input Publication 1746 UM022B EN P January 2005 A 12 Module Specifications Publication 1746 UM022B EN P January 2005 Thermocouple Types Appendix B Using Grounded Junction Ungrounded Junction and Exposed Junction Thermocouples This appendix describes the types of thermocouples available and explains the trade offs in using them with the 1746 NT8 module There are three 3 types of thermocouple junctions Grounded Junction The measuring junction is physically connected to the protective sheath forming a completely sealed integral junction If the sheath is metal or electrically conductive then there is electrical continuity between the junction and sheath The junction is protected from corrosive or erosive conditions The response time approaches that of the exposed junction type Ungrounded Junction The measuring junction is electrically isolated from the protective metal sheath This may also be referred to as an insulate
24. address 15 data 0 N10 0 0000 0010 0010 0011 N10 8 0000 0010 0011 1111 N10 1 0000 0010 0010 0011 N10 2 0000 0010 0010 0011 N10 3 0000 0010 0010 0011 N10 4 0000 0010 0010 0011 N10 5 0000 0010 0010 0011 N10 6 0000 0010 0010 0011 N10 7 0000 0010 0010 0011 Update Time Calculation Ch 0 Update Time 0 470 Ch 0 Open Circuit Check 0 045 Ch 1 Update Time 0 470 Ch 1 Open Circuit Check 0 045 Ch 2 Update Time 0 470 Ch 3 Update Time 0 470 Ch 3 Open Circuit Check 0 045 Ch 4 Update Time 0 470 Ch 4 Open Circuit Check 0 045 Ch 5 Update Time 0 470 Ch 6 Update Time 0 470 Ch 6 Open Circuit Check 0 045 Ch 7 Update Time 0 470 Ch 7 Open Circuit Check 0 045 CJC Checking 0 290 Update Time 4 410 Auto calibration Time Calculation Auto calibration for 10 Hz 1 975 Auto calibration for 60 Hz 0 525 Total Auto calibration 2 500 Max Time Between Updates 6 910 After a channel configuration word is changed by the ladder logic the module may not update the processor s input image until one update time later In order to ensure that the program is using the proper input data the ladder logic should wait one update time plus one Publication 1746 UM022B EN P January 2005 Programming Examples 5 7 Interfacing to the PID Instruction calibration time to ensure that the new input data matches the channel configuration requested The above table shows how to calculate the update time and
25. apply shrink wrap as an option connect to mV devices keeping the leads short IMPORTANT If noise persists try grounding the opposite end of the cable Ground one end only Publication 1746 UM022B EN P January 2005 Installing And Wiring Your Module 2 11 Terminal Block Diagram with Input Cable CJC A T CJC A Thermocouple or mV Cable Channel 0 Channel 0 gt Shield for CHO and CH 1 o Channel 1 Channel 1 gt Channel 2 Channel 2 Shield for CH2 and CH3 Channel 3 ll Channel3 Channel 4 Channel 4 gt Shield for CH4 and CH5 Channel 5 L gt Channel 5 L gt Channel 6 Channel 6 gt Shield for CH6 and CH7 S Channel 7 Channel 7 Recommended Torque Ls CJC B M CJCB TB1 0 3 to 0 5 Nm 2 5 to 4 5 in Ib The module also has a ground terminal TB1 which should be grounded to a chassis mounting bolt with 14 gauge wire Cold Junction Compensation CJC ATTENTION Possible Equipment Operation Do not remove or loosen the cold junction compensating temperature transducers located on the terminal block Both CJCs are required to ensure accurate thermocouple input readings at each channel The module will not operate in thermocouple mode if a CJC is not connected Failure to observe this precaution
26. be noted that a floated sheath may result in a less noise immune thermocouple signal Publication 1746 UM022B EN P January 2005 B 4 Using Grounded Junction Ungrounded Junction and Exposed Junction Thermocouples Publication 1746 UM022B EN P January 2005 Exposed Junction Thermocouples Recommended wiring for exposed junction thermocouples is shown in the following illustration Using exposed junction thermocouples may result in removal of channel to channel isolation This may occur if multiple exposed thermocouples are in direct contact with electrically conductive process material To prevent violation of channel to channel isolation For multiple exposed thermocouples do not allow the measuring junction of the thermocouple to make direct contact with electrically conductive process material Use all ungrounded junction thermocouple instead of the exposed junction type 1746 NT8 MUXES Grounded junction with nonconductive protective sheath Metal sheath with electrical continuity to thermocouple signal wires floating ground connection Appendix C Configuring the 1746 NT8 Module with RSLogix 500 This appendix describes how to configure the NT8 module with RSLogix 500 v6 10 or higher To configure your module 1 Access the I O Configuration menu 2 Determine the chassis number and slot location of where the NT8 module is located Highlight the module 1 0 configuration menu
27. cannot maintain accuracy specifications thus flagging an error The error bit is cleared when the error condition is resolved The channel data word is not updated during a period of auto calibration filter frequency tolerance errors Publication 1746 UM022B EN P January 2005 4 16 Channel Configuration Data and Status Publication 1746 UM022B EN P January 2005 Chapter 5 Programming Examples Earlier chapters explained how the configuration word defines the way a channel operates This chapter shows the programming required to configure the module It also provides you with segments of ladder logic specific to unique situations that might apply to your programming requirements The example segments include basic example automatic monitoring thermocouples and CJC sensors verifying channel configuration changes e interfacing to the PID instruction monitoring channel status bits PLC 5 example with NT8 in Remote I O rack To enter data into the channel configuration word O e 0 through O e 7 when the channel is disabled bit 0 0 follow these steps Refer to the table on page 4 4 for specific configuration details Example Configure eight channels of a thermocouple module residing in slot 3 of 1746 chassis Configure each channel with the same parameters Channel Configuration 15 14 13 12 10 9 8 7 6 5 4 3 2 1 0 1 00 0 0 0 1 0 0 0 1 0 0 0 1 1
28. change depending on what you entered in the channel tab and the module location Publication 1746 UM022B EN P January 2005 C 6 Configuring the 1746 NT8 Module with RSLogix 500 Publication 1746 UM022B EN P January 2005 Glossary You should understand the following terms and abbreviations before using this guide A D Refers to analog to digital conversion The conversion produces a digital value whose magnitude is proportional to the instantaneous magnitude of an analog input signal Attenuation The reduction in magnitude of a signal as it passes through a system The opposite of gain Channel Refers to one of eight small signal analog input interfaces to the modules terminal block Each channel is configured for connection to a thermocouple or DC millivolt mV input device and has its own configuration and status words Chassis A hardware assembly that houses devices such as I O modules adapter modules processor modules and power supplies CJC Cold Junction Compensation The means by which the module compensates for the offset voltage error introduced by the temperature at the junction between the thermocouple lead wire and the input terminal block the cold junction Common mode rejection ratio CMRR The ratio of a device s differential voltage gain to common mode voltage gain Expressed in dB CMRR is a comparative measure of a device s ability to reject interference caused by a voltage common to its
29. llle 1 3 SYSLEM OVETVIEW e a deep dee eo eO octo e 1 3 System Operations orras y Ea xeu teg NACE HC Wd 1 4 Module ODeSratiOBu muro eec Lock obo PROS EIE ERES 1 5 Module Addressing 4 feos us sca aye ee ok 1 5 Block Ora is certe Packs ure A E c Mod G 1 6 Linear Millivolt Device Compatibility 1 7 Chapter 2 Electrostatic T9308 uo x 0b escra IAE os 2 1 Power Requirements llle 2 2 Considerations for a Modular System 2 2 Fixed I O Chassis I O Module Compatibility 2 3 General Considerations 1 uy vu ees se p Rex 2 4 Module Installation and Removal lun 2 5 Terminal Block Removal 21 4 411293 pepe boss 2 6 Wiring Your Module d aged Wig ey ect ose se ed 2 7 Preparing and Wiring the Cables 2 0 Cold Junction Compensation CJC 2 11 Chapter 3 Module ID COKE o ahah Send E boe Geka 3 1 Module Addressing iuge eet eet ea ORG 3 2 Output Image Configuration Words 3 2 Input Image Data Words and Status Words 3 3 Channel Filter Frequency Selection md cae 3 3 Channel Cut Off Prequenye vac oen Cr pod cus 3 4 Channel Step Responses pica tees PSY EY TU STEPS 3 6 Update Timey uod ined etes a 3 7 Update Time Calculation Example 3 8 Channel Turn On Turn Off and Reconfiguration Times 3 8 Auto calibration iocus ge por ne aa 3 8 Response to Slot Disabling i oou ola deo Gee a ee 3 9 Input Response 3a cioe eee S YER AR
30. temperature Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional counts c c o c Open Circuit Zero on open circuit Max on open circuit Min on open circuit Disabled co gt D Temperature units C F Publication 1746 UM022B EN P January 2005 Channel Configuration Data and Status 4 13 Channel 0 to 7 Status Word I e 0 through l e 7 Bit Definitions To Select Make these bit settings 15 14 13 12 1 10 9 8 7 6 5 4 3 2 1 0 10 Hz input filter 0 0 Channel filter 50 Hz input filter 0 1 frequency 60 HZ input filter 1 0 250 Hz input filter 1 1 Open circuit No error 0 SITUE Open circuit detected 1 Under range No error 0 error Under range condition 1 Over range No error 0 error Over range condition 1 Channel error No error 0 Channel error 1 TIP It takes one timing cycle to complete an update Refer to Chapter 3 for module update times If the channel for which you are seeking status is disabled all bit fields are cleared The status word for any disabled channel is always 0000 0000 0000 0000 regardless of any previous setting that may have been made to the configuration word IMPORTANT Explanations of the status co
31. terminal relative to ground Common mode voltage The voltage difference between the negative terminal and analog common during normal differential operation Publication 1746 UM022B EN P January 2005 Glossary 2 Publication 1746 UM022B EN P January 2005 Configuration word Contains the channel configuration information needed by the module to configure and operate each channel Information is written to the configuration word through the logic supplied in your ladder program Cut off frequency The frequency at which the input signal is attenuated 3 dB by the digital filter Frequency components of the input signal that are below the cut off frequency are passed with under 3 dB of attenuation for low pass filters dB decibel A logarithmic measure of the ratio of two signal levels Data word A 16 bit integer that represents the value of the analog input channel The channel data word is valid only when the channel is enabled and there are no channel errors Digital filter A low pass filter of the A D converter The digital filter provides high frequency noise rejection Effective resolution The number of bits in the channel data word that do not vary due to noise Full scale error gain error The difference in slope between the actual and ideal analog transfer functions Full scale range FSR The difference between the maximum and minimum specified analog values Gain drift The change in full scal
32. wit Note the example provide CEND The following example shows sample ladder logic when using a PLC 5 controller to control the module in remote rack across the PLC 5 must use Block transfer reads and h the 1746 NT8 module in a remote rack s code which will reconfigure the module if the PLC 5 senses are remote rack fault Also the PLC 5 processor uses the exact same configuration words as the SLC 500 processors Publication 1746 UM022B EN P January 2005 5 14 Programming Examples During the first scan clear the NT8 Configurated bit B3 4 to initiate the NT8 configuration process First scan or SFC step NT8_CONFIGURED S 1 B3 0 iE uD 15 4 If the NT8 is configured and a rack fault occurs clear the NT8 Configured bit B3 4 to initiate the NT8 configuration process NT8_CONFIGURED RIO RACKI FLT B3 0 MVM E Masked Move 4 Source N30 2 256 Mask OFH 15 lt Dest N11 3 0 RIO RACKI FLT NT8 CONFIGURED NEQ B3 0 Not Equal CUD Source A NI1 3 4 0 lt Source B 0 0 lt Until the NT8 is configured send the 8 configuration words N12 10 17 to the NT8 using repeating BTW s NT8 CONFIGURED NT8 BTW EN NT8 BTW B3 0 BT20 1 BTW jt 4 Block Transfer Write CEN gt 4 EN Module Type Generic Block Transfer Rack 001 lt DN gt Group 0 Module 0 H CER gt Control Block BT20 1 Data File N12 10 Length 8 Continuous No When the NT8 is
33. 1 to allow the NT8 to update its 1 0 mage to the channel status words The time required for the NT8 to update its 1 0 image is dependent on the NT8 configuration Note the time required to be greater than the channel update time including the auto calibration time NT8_CHECKING_STS NT8_STS_CNF_TMR B3 6 TON JE Timer On Delay L END 4 Timer T11 1 Time Base L0 L DN 5 Preset 7 lt Accum 0 lt Publication 1746 UM022B EN P January 2005 5 10 Programming Examples AFter waiting for the NT8 to update its 1 0 image check each channel s status error bits by masking off the appropriate bits and checking if these bits are set non zero If an error is detected set the appropriate channel status error bits B3 112 B3 119 Rung 5 checks channels 0 to 3 NT8_STS_CNF_TMR DN NT8_CHECK_FLAGS Tl1 1 B3 6 MOV 0005 JF OSR Move DN 5 Source 0 0 lt Dest B3 7 0000000000000001 lt NT8_CH0_STS_FLAGS MVM Masked Move Source 11 0 0 lt Mask OF000h 4096 lt Dest N10 20 4096 lt NT8_CH0_STS_FLAGS NT8 CH0 ERROR NEQ B3 7 Not Equal CL Source A N10 20 0 4096 Source B 0 0 lt NT8_CH1_STS_FLAGS MVM Masked Move Source 1 1 1 0 lt Mask OFO00h 4096 lt Dest N10 21 0 lt NT8_CH1_STS_FLAGS NT8_CH1_ERROR NEQ B3 7 Not Equal CL Source A N10 21 1 0 lt Source B 0 0 lt NT8_CH2_STS_FLAGS
34. 4 096 possible counts It can therefore be used to measure 1 part in 4096 Sampling time The time required by the A D converter to sample an input channel Publication 1746 UM022B EN P January 2005 Glossary 4 Publication 1746 UM022B EN P January 2005 Status word Contains status information about the channel s current configuration and operational state You can use this information in your ladder program to determine whether the channel data word is valid Step response time The time required for the A D signal to reach 95 of its expected final value given a full scale step change in the input signal Update time The time for the module to sample and convert a channel input signal and make the resulting value available to the SLC processor A addressing 3 2 auto calibration 3 8 automatic monitoring thermocouples and CJC sensors 5 3 before using module 3 1 block diagram 1 6 C cables 2 9 channel configuration 1 channel configuration procedure 4 2 data format select 4 5 effective resolutions 4 6 input types select 4 5 select channel enable 4 5 using scaled for PID and proportional counts 4 6 channel cut off frequency 3 4 channel data and status word 4 11 channel diagnostics 6 1 channel enable select 4 5 channel filter frequency selection 3 3 channel reconfiguration times 3 8 channel status checking 4 12 channel error 4 15 channel filter frequency 4 15 channel status 4 14 data format type statu
35. 7 LED Troubleshooting Tables Module status LED Troubleshooting Your Module 6 3 If Module Status Then Take this Corrective Action LED is On The module is No action required operating properly Off The module is Cycle power If the condition persists call turned off or it your local Allen Bradley distributor for detected a module assistance fault Flashing Jumper may be in Check jumper 1 position wrong position Module status and Channel status LED If Module Status LED is On And Channel Then Take this Corrective Action Status LED is On The channel is enabled No action required Flashing The module detected Examine error bits in status word open circuit condition If bit 12 1 the input has an open under range condition circuit over range condition If bit 13 1 the input value is under range If bit 1421 the input value is over range If bit 1521 the channel has a diagnostic channel error Off The module is in power No action is required up or the channel is disabled Publication 1746 UM022B EN P January 2005 6 4 Troubleshooting Your Module Publication 1746 UM022B EN P January 2005 Channel status LEDs Green The channel status LED operates with status bits in the channel status word to indicate the following faults detected by the module invalid channel configuration an open circuit input out of range errors
36. ATION T11 0 MOV 0004 JE Move DN Source N10 8 32737 lt Dest O 1 0 32767 lt Publication 1746 UM022B EN P January 2005 CHECKING_CJC B3 6 CL 4 0005 0006 0007 0008 0009 Programming Examples 5 5 Wait 7 seconds for Channel 0 to accept CJC configuration and provide a data value time depends on module configuration CHECKING_CJC CJC_CFG_TMR B3 6 TON JE Timer On Delay CEN gt 4 Timer TII Time Base 1 0 CDN gt Preset 7 lt Accum 0 lt Copy CJC Temperature 1 1 0 into CJC register N10 12 CJC_CFG_TMR DN CJC_TEMP T11 1 B3 0 MOV J F OSR Move DN 4 Source 1 1 0 3744 lt Dest N10 12 329 lt Move Channel O s regular conf ensure word has been accepte CJC_CFG_TMR DN E word into the Channel 0 configuration word and start timer to prior to taking the thermocouple temperature readings NT8_CONFIGURATION T11 1 MOV J F Move DN Source N10 0 32767 lt Dest O 1 0 32767 lt REG_CFG_TMR TON Timer On Delay CEN gt Timer TIN Time Base 1 0 CDN gt Preset 7 lt Accum 0 lt When CJC check cycle is comp REG_CFG_TMR DN leted T1 1 2 DN is set reset the Checking CJC Bit B3 100 CHECKING_CJC T11 2 B3 6 J E CU mm v DN 4 CEND 5 Publication 1746 UM022B EN P January 2005 5 6 Programming Examples Data Table for Configuration Changes address i5 data 0
37. Allen Bradley SLC 500 Thermocouple mV Analog Input Module 1746 NT8 User Manual mn e i m e Rockwell Automation Important User Information Solid state equipment has operational characteristics differing from those of electromechanical equipment Safety Guidelines for the Application Installation and Maintenance of Solid State Controls Publication SGI 1 1 available from your local Rockwell Automation sales office or online at http www ab com manuals gi describes some important differences between solid state equipment and hard wired electromechanical devices Because of this difference and also because of the wide variety of uses for solid state equipment all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable In no event will Rockwell Automation Inc be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment The examples and diagrams in this manual are included solely for illustrative purposes Because of the many variables and requirements associated with any particular installation Rockwell Automation Inc cannot assume responsibility or liability for actual use based on the examples and diagrams No patent liability is assumed by Rockwell Automation Inc with respect to use of information circuits equipment or software described in this manual Throu
38. C and 120 uV maximum over temperature for the 10 Hz 50 Hz and 60 Hz filter frequencies The 250 Hz filter frequency accuracy is highly dependent upon operating environment and may be worse in noisy environments As with any high precision analog input device system grounding does affect the accuracy of the readings Care should be taken to ensure that the proper filter frequency has been selected based on the environmental conditions in which the module is to be used CJC compensation does not affect the millivolt inputs in terms of accuracy The following diagrams are provided to give a measure of system accuracy using test data from a single test module The tests recorded deviation between measured and expected values This data was taken over an entire range of the thermocouple or millivolt range as applicable and over the module s temperature range 0 60 C The maximum deviation for each thermocouple temperature or millivolt range was plotted Module Specifications A 5 uV Deviation uV Deviation uV Err 100mV Span Prop Cts 60 Hz 0 C 50 00 y 45 00 4 40 00 4 35 00 4 30 00 4 25 00 4 uV Error 20 00 4 15 00 4 10 00 4 5 00 4 0 00 S jv qv V d Sh WD gd GM eof FS Ah od db de 3 WR IS S SS SOLID SIS IRISN os INSI Sos SOS S mV Input uV Err 100mV Span Prop Cts 60 Hz 25 C 50 00 45 00 40 00 35 00 30 00 25 00 uV E
39. E GO IPS 3 9 Output RESPONSE enina penp a re ae sd E a que dere 3 9 Publication 1746 UM022B EN P January 2005 Table of Contents ii Channel Configuration Data and Status Programming Examples Troubleshooting Your Module Publication 1746 UM022B EN P January 2005 Chapter 4 Channel Configuration ta do O a wee VR OR Yi Channel Configuration Procedure i bue YR es Select Channel Enable BO laos Qe ctn dod de Select Input Types Bits 1 through 4 Select Data Format Bits 5 and 6 4x Yee us Using Scaled for PID and Proportional Counts Effective Resolutions 432 sog PE Des SCAMS Examples ox Ped ps xXx Es ON OK ees EXC Select Open Circuit State Bits 7 and 8 Select Temperature Units Bit Os see ia Select Channel Filter Frequency Bits 10 and 11 Unused Bits Bits 12 through 14 Select Input Image Type Bit 15 i best ut Channel Data Status Word y eua ten Ta Ke Channel Status Checkout e A TOES ERR Channel Status Bit O led Goma Pe poen Input Type Status Bits 1 through 4 Data Format Type Status Bits 5 and 6 Open Circuit Type Status Bits 7 and 8 Temperature Units Type Status Bit 9 Channel Filter Frequency Bits 10 and 11 Open Circuit E 242 63e da ERE SON ESS Under Ratige Error Bit tae 4 sci 4 ur Ro SAS RT SA Over Range Error Bit Als ars Ste dete Channel Error CUBILI RA Rare DRE EA
40. Output pa E Scan n Sete Output Image Input Slot e Scan Input Image The following memory map shows you how the SLC processor s output and input tables are defined for the module Image Table Bit 15 Bit 0 Channel 0 Configuration Word Channel 1 Configuration Word Channel 2 Configuration Word Thermocouple Channel 3 Configuration Word Module Image Table Channel 4 Configuration Word Channel 5 Configuration Word Channel 6 Configuration Word Output Image 8 Words Channel 7 Configuration Word Input Image 8 Words Channel 0 Data or Status Word hannel 1 Data or Status Word hannel 2 Data or Status Word Data or Status Word s Word Data or Status Word a a a Data or Status Word a a a 3 4 hannel 5 Data or S 6 7 Data or Status Word Bit 15 Bit 0 Output Image Configuration Words Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Address 0 e 0 O e 1 0 e 2 0 e 3 0 e 4 0 e 5 0 e 6 0 e 7 e 0 l e 2 3 e 4 e 5 e 6 e 7 Address Eight words of the SLC processor s output image table are reserved for the module Output image words 0 through 7 are used to configure the module s input channels 0 through 7 Each output image word configures a single channel and can b
41. TENTION Possible Equipment Operation Before installing or removing your module always disconnect power from the SLC 500 system and from any other source to the module in other words do not hot swap your module and disconnect any devices wired to the module Failure to observe this precaution can cause unintended equipment operation and damage 0 _ 16 y We WW N Top and Bottom a E Y Module Release s O AE Card Guide To insert your module into the chassis follow these steps 1 Before installing the module connect the ground wire to TB1 See the figure on page 2 10 2 Align the circuit board of your module with the card guides at the top and bottom of the chassis 3 Slide your module into the chassis until both top and bottom retaining clips are secure Apply firm even pressure on your module to attach it to its backplane connector Never force your module into the slot Publication 1746 UM022B EN P January 2005 2 6 Installing And Wiring Your Module 4 Cover all unused slots with the Card Slot Filler Allen Bradley part number 1746 N2 Terminal Block Removal To remove the terminal block 1 Loosen the two terminal block release screws To avoid cracking the terminal block alternate between screws as you remove them 2 Using a screwdriver or needle nose pliers carefully pry the terminal block loo
42. TWH d G File Length Edit G Data 4 Press the Configure button The following dialog box appears This allows you to configure options for each channel Publication 1746 UM022B EN P January 2005 Configuring the 1746 NT8 Module with RSLogix 500 C 3 Module configuration Options 1746 NT8 Analog 8 Ch Thermocouple Input i x Channel5 Channel 6 Channel 7 Channel 8 Channel 1 Channel2 Chamel3 Chawmel4 Channel Enabled Input Type Temperature Units Type J v ec y Filter Frequency Broken Input 10 Hz y Zero y Data Format Engineering Units Y Input Image Type Status Word Cancel Apply Help The dialog box allows you to access the parameters for all channels Each tab has an identical menu with the parameters shown Publication 1746 UM022B EN P January 2005 c 4 Publication 1746 UM022B EN P January 2005 Configuring the 1746 NT8 Module with RSLogix 500 Menu Options 1746 NT8 Analog 8 Ch Thermocouple Input x Channel5 Channel 6 Channel 7 Channel 8 Channel 1 Channel2 Channela Channels Channel Enabled Input Type Temperature Units LM Y Broken Input Zero Y Input Image Type s tatus Word Y Cancel Apply Help Opening the drop down menus of the various parameters shows the available choices The following summarizes the different options for each parameter Parameter Description Channel Co
43. Tas T x T 1 T T T T 0 e 0 Channel 0 Channel Configuration Word 0 e 1 i i Channel 1 Channel Configuration Word i 1 1 1 I L 1 1 1 J L ji 1 if il L 1 1 1 T T T 1 T T T T 1 T T T T 1 r T T T 0 e 2 Channel 2 Channel Configuration Word L L L J L L L j J L L L L J L 1 L L T T T 1 I T T T 1 I T T T 1 I T T T 0 e 3 Channel 3 Channel Configuration Word L L L f L L 1 L J L L L L J L L L L T T ji 1 r T T T 1 Ji T T T 1 T T T ji D e 4 Channel 4 Channel Configuration Word 1 1 1 J L L L 1 J j E 1 L j L 1 L 1 T T T 1 I T T T 1 T T T T 1 I T T T 0 e 5 Channel 5 Channel Configuration Word 1 1 1 L 1 1 1 L 1 1 i L 1 1 T T T 1 r T T T 1 T T T T 1 r i T T 0 e 6 l i i l i Channel 6 Channel Configuration Word i l i O e 7 i i Channel 7 Channel Configuration Word i i L L L J L L 1 L J L L L L J L L L L e slot number of the module Publication 1746 UM022B EN P January 2005 4 2 Channel Configuration Data and Status The configuration word default settings are all zero Next we describe how you set configuration bits of a channel configuration word to set up the following channel parameters data format such as engineering units counts or scaled for PID how the channel should respond to a detected open input circuit e filter frequency selection e temperature units in C or F whether the channel is enabled or disabled e whether status or data information is selected for the module s inp
44. Wiring Your Module Read this chapter to install and wire your module This chapter covers avoiding electrostatic damage determining power requirements installing the module wiring signal cables to the module s terminal block Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins Guard against electrostatic damage by observing the following precautions ATTENTION Electrostatically Sensitive Components Before handling the module touch a grounded object to rid yourself of electrostatic charge Handle the module from the front away from the backplane connector Do not touch backplane connector pins Keep the module in its static shield container when not in use or during shipment Failure to observe these precautions can degrade the module s performance or cause permanent damage Publication 1746 UM022B EN P January 2005 2 2 Installing And Wiring Your Module Power Requirements Publication 1746 UM022B EN P January 2005 The module receives its power through the SLC 500 chassis backplane from the fixed or modular 5 V dc 24 V dc chassis power supply The maximum current drawn by the module is shown in the table below Maximum Current Drawn by the Module 5Vdc Amps 24Vdc Amps 0 120 0 070 Considerations for a Modular System Place your module in any slot of an SLC 500 modular or modular expansion chassis except for the left most slot slot
45. alibration occurs immediately following configuration of a previously unselected filter frequency and generally every two minutes for all selected filter frequencies of the system The time required to perform auto calibration is defined as follows Auto calibration Time Response to Slot Disabling Considerations Before Using Your Module 3 9 CJC sensors are acquired at 60 Hz to maximize the trade off between resolution and update rate For example if some channels are acquired at 250 Hz and some are acquired at 50 Hz then the total auto calibration time would be Frequency Auto Calibration 250 Hz 325 ms 60 Hz 525 ms 50 Hz 585 ms 1 435 s Total During auto calibration input values are not updated By writing to the status file in the modular SLC processor you can disable any chassis slot Refer to your SLC programming manual for the slot disable enable procedure Possible Equipment Operation Always understand the implications of disabling a module before using the slot disable feature Failure to observe this precaution can cause unintended equipment operation Input Response When a thermocouple slot is disabled the thermocouple module continues to update its input image table However the SLC processor does not read input from a module that is disabled Therefore when the processor disables the thermocouple module slot the module inputs appearing in the processor image table remain in their last sta
46. ation Data and Status 1746 NT8 Thermocouple Module Channel Data Word Format I DaaFoma s Input Type Engineering Unitsx10 Engineering Unitsxt Scaled for PID Proportional Celsius Fahrenheit Celsius Fahrenheit Counts J 210 to 760 346 to 1400 2100 to 7600 3460 to 14000 0 to 16383 32768 to 32767 K 270 to 1370 454 to 2498 2700 to 413700 4540 to 24980 0 to 416383 32768 to 432767 T 270 to 400 454 to 752 2700 to 4000 4540 to 7520 0 to 16383 32768 to 32767 E 270 to 1000 454 to 1832 2700 to 10000 4540 to 18320 0 to 16383 32768 to 32767 R 0 to 1768 32 to 3214 0 to 17680 320 to 32140 0 to 16383 32768 to 32767 S 0 to 1768 32 to 2372 0 to 17680 320 to 32140 0 to 16383 32768 to 32767 B 300 to 1820 572 to 3308 3000 to 18200 5720 to 3276 72 0 to 16383 32768 to 32767 N 0 to 1300 32 to 2372 0 to 13000 320 to 23720 0 to 16383 32768 to 32767 450 mV 500 to 500 500 to 500 5000 to 5000 5000 to 5000 0 to 16383 32768 to 432767 100 mV 1000 to 1000 1000 to 1000 10000t0 1000 10000 to 10000 0 to 416383 32768 to 32767 CJC Sensor 25 to 105 13 to 221 250 to 1050 130 to 2210 0 to 16383 32768 to 432767 1 When millivolts are selected the temperature setting is ignored Analog input data is the same for either C or F selection 2 Type B thermocouple cannot be represen ed in engine
47. auto calibration time for the channel configuration being used The thermocouple module was designed to interface directly to the SLC 5 02 or later processor PID instruction without the need for an intermediate scale operation Example Use 1746 NT8 channel data as the process variable in the PID instruction 1 Select scaled for PID as the data type in the channel configuration word 2 Specify the thermocouple channel data word as the process variable for the PID instruction In this example the value 32701 8043 H is the numeric equivalent of configuration word N10 0 for channel 0 It is configured for a type K thermocouple scaled for PID zero the signal for an open circuit 10 Hz C and channel enabled Programming for PID Control Example First Pass Bit Initialize NT8 Rung 2 0 e Channel 0 sl m E MOVE TN 15 Source N10 0 32701 Dest 0 3 0 0 Rung 2 1 PID PID Control Block N11 0 Process Variable I 3 0 Control Variable N11 23 Control Block Length 23 SCL E SCALE Rung 2 2 Source N11 23 Rate 10000 Offset Dest The Rate and Offset parameters should be set per your application The Destination will typically be an analog output channel Publication 1746 UM022B EN P January 2005 5 8 Programming Examples Monitoring Channel Status Bits Publication 1746 UM022B EN P January 2005 The following example shows how to monitor the open circu
48. can cause unintended equipment operation and damage To obtain accurate readings from each of the channels the cold junction temperature temperature at the module s terminal junction between the thermocouple wire and the input channeD must be compensated for Two cold junction compensating sensors have been integrated in the removable terminal block They must remain installed Publication 1746 UM022B EN P January 2005 2 12 Installing And Wiring Your Module Publication 1746 UM022B EN P January 2005 Module ID Code Chapter 3 Considerations Before Using Your Module This chapter explains how the module and the SLC processor communicate through the processor s I O image tables It also describes the module s input filter characteristics Topics discussed include module ID code module addressing channel filter frequency selection channel turn on turn off and reconfiguration times response to slot disabling The module ID code is unique number assigned to each 1746 I O module The ID code defines the type of I O module and the number of words used in the processor s I O image table The module ID code for the 1746 NT8 module is 3533 No special I O configuration is required The module ID automatically assigns the correct number of input and output words Publication 1746 UM022B EN P January 2005 3 2 Considerations Before Using Your Module Module Addressing SLC 5 0X Data Files
49. cifications cures y RE ao Reo A 2 Input Specifications aa A 3 Overall Accuracy a e UR beheld fedus A 4 IVT WOR a e reta Groene troy ed gp ot T khan sy A 4 Thenmnocouples cos mers cs eee ee Fed Va xe Eae A 6 Appendix B Thermocouple Types 425 eee coe eR de doe B 1 Grounded Junction sia Oe AG avy cde Gun pets B 2 Ungrounded Insulated Junction B 2 Exposed Junction ie de aos beate lo Rho dad B 2 A d o err dedi oe pene hose bee e eme OR OD ced B 2 Grounded TUBSHOD s veas OI MEN ES ASA B 3 Exposed Junction Thermocouples o 25e REY WES B 4 Appendix C Glossary Index Publication 1746 UM022B EN P January 2005 Table of Contents iv Publication 1746 UM022B EN P January 2005 Summary of Changes The information below summarizes the changes to this manual since the last printing Updates to the manual include using RSLogix 500 instead of APS software To help you find new and updated information in this release of the manual we have included change bars as shown to the right of this paragraph The table below lists the sections that document new features and additional or updated information on existing features For this information See updated data table for initial programming page 5 2 added SLC 500 example with NT8 in page 5 15 Remote 0 Rack updated thermocouple graphs page A 8 configuring NT8 with RSLogix 500 page C 1 Publication 1746 UM022B EN P January 2005 Summar
50. circuits should also be wired in series so that when any one circuit opens the master control relay is de energized thereby removing power Class 1 Division 2 This equipment is suitable for use in Class 1 Division 2 groups A B C and D or non hazardous locations only ATTENTION Explosion Hazard Never modify these circuits to defeat their function Serious injury or equipment damage may result e Substitution of components may impair suitability for Class 1 Division 2 Do not disconnect equipment unless power has been switched off or the area is known to be nonhazardous e When in hazardous locations turn off power before replacing or wiring modules Refer to your system s User Manual for more information Appendix A Electrical Specifications Module Specifications This appendix lists the specifications for the 1746 NT8 Thermocouple millivolt Input Module Backplane Current Consumption 120 mA at 5V dc 70 mA at 24Vdc Backplane Power Consumption 2 28W maximum 0 6W at 5V dc 1 68W at 24V dc Number of Channels 8 backplane and channel to channel isolated 1 0 Chassis Location Any 1 0 module slot except 0 A D Conversion Method Sigma Delta Modulation Input Filtering Input Filtering Low pass digital filter with programmable notch filter frequencies Normal Mode Rejection between input and input Greater than 100 dB at 50 60 Hz Common Mode Rej
51. configured latch the NT8 Configured bit B3 4 BTW_DONE NT8_CONFIGURED BT20 1 B3 0 J E CLS 3 E DN 4 If the NT8 is configured read the 8 input words into N12 0 N12 7 using repeating BTR s NT8_CONFIGURED BTR_TRIGGER B3 0 BT20 0 BTR L Jt Block Transfer Read CEN gt 4 EN Module Type Generic Block Transfer Rack 001 H DN gt Group 0 Module 0 CER gt Control Block BT20 0 Data File N12 0 Length 8 Continuous No C END gt Publication 1746 UM022B EN P January 2005 Programming Examples 5 15 SLC 500 Example with NT8 in Remote 1 0 Rack The following example shows sample ladder logic when using an SLC controller to control the module in remote rack across the Remote I O network The SLC must use Block transfer reads and writes to communicate with the 1746 NT8 module in a remote rack RIO example with SLC processor LAD 2 Total Rungs in File 5 On first pass clear the NTS configured bit to allow the configuration process to proceed First Pass S1 0000 15 NTS CONFIGURED B3 0 Send the configuration data to the module until it is successfully configured NT3 CONFIGURED B3 0 0001 BTW DN BIT BTW ER BIT BTW CONTROL N20 0 N20 0 BTW Block Transfer Write Rack Group Slot Control Block N20 0 Data File N12 10 Buffer File MD 1 100 Requested Word Count 8 Transmitted Word Count Control Block Length 3 Set the NT3 configuration bit if the module has been succe
52. converts analog input voltages into cold junction compensated and linearized digital temperature readings The module uses National Institute of Standards and Technology NIST ITS 90 for thermocouple linearization When configured for millivolt analog inputs the module converts analog values directly into digital counts The module assumes that the mV input signal is linear System Operation At power up the module checks its internal circuits memory and basic functions During this time the module status LED remains off If the module finds no faults it turns on its module status LED Channel Data Word Channel Status Word Th M hern pe SLC 500 ermocouple or m nput Analog Signals Mele Processor Channel Configuration Word H After completing power up checks the module waits for valid channel configuration data from your SLC ladder logic program channel status LEDs are off After channel configuration data is transferred and channel enable bits are set the enabled channel status LEDs turn on Then the channel continuously converts the thermocouple or millivolt input to a value within the range you selected for the channel Each time the module reads an input channel the module tests that data for a fault i e over range or under range condition If open circuit detection is enabled the module tests for an open circuit condition If it detects an open circuit over range or under ra
53. d for PID display type desired channel temp 344 C Want to calculate Scaled for PID equivalent From Channel Data Word Format table Si oy 210 C and Sigy 760 C Solution Scaled for PID Equivalent 16384 x 344 C 210 C 760 C 210 C 9357 Proportional Counts to Engineering Units Equation Engineering Units Equivalent Stow Suigh Stow x Proportional Counts value displayed 32768 65536 Data Assume type E input type proportional counts display type channel data 21567 Want to calculate F equivalent From Channel Data Word Format table Spy 454 F and Spigy 1832 F Solution Engineering Units Equivalent 454 F 1832 F 454 F x 21567 32768 65536 1441 3 F Engineering Units to Proportional Counts Equation Proportional Counts Equivalent 65536 x Engineering Units desired Sjgw Suigh Stow l 32768 Data Assume type E input type proportional counts display type desired channel temp 1000 F Want to calculate Proportional Counts equivalent From Channel Data Word Format table SLOW 454 F and SHIGH 1832 F Proportional Counts Equivalent 65536 x 100 F 454 F 1832 F 454 F 32768 8916 Solution Proportional Counts Equivalent 65536 x 1000 F 454 F 1832 F 454 F 32768 8916 Publication 1746 UM022B EN P January 2005 4 8 Channel Configur
54. d junction This type is often used where noise would affect the reading and for frequent or rapid temperature cycling The response time is longer than the grounded junction Exposed Junction The measuring junction does not have a protective metal sheath so it is exposed This junction style provides the fastest response time but leaves the thermocouple wires unprotected against corrosive or mechanical damage The following illustrations show each of the three 3 thermocouple types Publication 1746 UM022B EN P January 2005 B 2 Using Grounded Junction Ungrounded Junction and Exposed Junction Thermocouples Grounded Junction Measuring Junction is Metal Sheath connected to sheath Extension Wire Ny Ungrounded Insulated Junction Measuring Junction is isolated from sheath Exposed Junction Measuring Junction has no sheath N Isolation The 1746 NT8 module provides the following electrical isolation 12 5V dc electrical isolation channel to channel 500V dc electrical isolation channel to chassis ground 500V dc electrical isolation channel to backplane Care must be taken when choosing a thermocouple type and connecting it to the 1746 NT8 module from the environment being measured If adequate precautions are not taken for a given thermocouple type the electrical isolation of the 1746 NT8 module may be compromised Publication 1746 UM022B EN P January 2005 Using Grounded Junction Ungrounded Junction a
55. d open circuit detection The module performs internal diagnostics at both levels and immediately indicates detected error conditions with either of its status LEDs See the LED troubleshooting tables on page 6 3 for LED operation Module Diagnostics at Powerup At module powerup the module performs a series of internal diagnostic tests If the module detects a failure the module status LED remains off Channel Diagnostics When a channel is enabled the module checks for a valid configuration Then on each scan of its inputs the module checks for out of range and open circuit fault conditions of its inputs including the CJC input When the module detects a failure of any channel diagnostic test it causes the channel status LED to blink and sets the corresponding Publication 1746 UM022B EN P January 2005 6 2 Troubleshooting Your Module channel fault bit bits 12 15 of the channel status word Channel fault bits and LEDs are self clearing when fault conditions are corrected TATE EE if you clear the channel enable bit the channel status bits are reset The module has nine LEDs as shown below eight channel status LEDs numbered to correspond with each channel one module status LED LED for Module Status Publication 1746 UM022B EN P January 2005 INPUT Ch WI anne EE Status O 7116 Module 3117 Thermocouple mV LEDs for Channels 0 to
56. dule update time 290 ms 470 ms 470 ms 470 ms 470 ms 470 ms 470 ms 470 ms 470 ms 4 05 s Publication 1746 UM022B EN P January 2005 3 8 Considerations Before Using Your Module Channel Turn On Turn Off and Reconfiguration Times Auto calibration Publication 1746 UM022B EN P January 2005 Update Time Calculation Example The following example shows how to calculate the module update time for the given configuration Channel 0 configured for 250 Hz filter frequency enabled Channel 1 configured for 250 Hz filter frequency enabled Channel 2 configured for 50 Hz filter frequency enabled Channel 3 through 7 disabled Using the values from the table on page 3 7 add the sum of all enabled channel sample times plus one CJC update time Channel 0 sampling time 66ms Channel 1 sampling time 66ms Channel 2 sampling time 140ms CJC update time 290ms Module update time 562ms The time required for the module to recognize a new configuration for a channel is generally one module update time plus 890 ys per newly configured channel If the filter frequency selected for the newly enabled configured channel is new to the module then auto calibration is performed following configuration recognition Turn off time requires up to one module update time Reconfiguration time is the same as turn on time Auto calibration is performed by the module to correct for drift errors over temperature Auto c
57. e module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and make the resulting data values available to the SLC processor It can be calculated by adding the sum of all enabled sample times plus a CJC update time Channel 1 Disabled Channel 2 Disabled Channel 7 Disabled Enabled Enabled Enabled Sample Sample Sample Sample Channel 0 Channel 1 Channel 2 Channel 7 CJC Channel Update CJC Calculate Calculate Calculate Calculate Previous Previous Previous Previous The following table shows the channel sampling time for each filter frequency It also gives the CJC update time Channel Sampling Time Channel Sampling Time for Each Filter Frequency all values 1 ms CJC Update Time 250 Hz Filter 60 Hz Filter 50 Hz Filter 10 Hz Filter 290 ms 66 ms 125 ms 140 ms 470 ms The times above include a settling time necessary between input channel readings The sampling times for filter frequencies listed do not include a 45 ms open circuit detection time utilized when the channel is configured for open circuit detection CJC open circuit detection does not require the additional 45 ms settling time The fastest module update time occurs when only one channel with a 250 Hz filter frequency is enabled Module update time 290 ms 66 ms 356 ms The slowest module update time occurs when eight channels each using a 10 Hz filter frequency are enabled Mo
58. e referred to as a configuration assigned to the module Example Address If you want to configure channel 2 on the word Each word has a unique address based on the slot number module located in slot 4 in the SLC chassis your address would be O 4 2 Slot J i Word File Type N 4 Publication 1746 UM022B EN P January 2005 7 Element Delimiter X Word Delimiter Channel Filter Frequency Selection Considerations Before Using Your Module 3 3 Chapter 4 provides detailed bit information about the data content of the configuration word Input Image Data Words and Status Words Eight words of the SLC processor s input image table are reserved for the module Input image words are multiplexed since each channel has one data word and one status word The corresponding configuration word selects whether the channel status or channel data is in the input image word Status bits for a particular channel reflect the configuration settings that you entered into the configuration output image word for that channel To receive valid status the channel must be enabled and the module must have stored a valid configuration word for that channel Each input image word has a unique address based on the slot number assigned to the module Example Address To obtain the status data word of channel 2 input word 2 of the module located in slot 4 in the SLC chassis use address I 4 2 Slot File Type Sg e Wo
59. e transition voltage measured over the operating temperature range of the module Glossary 3 Input data scaling Depends on the data format that you select for the channel data word You can select from scaled for PID or Engineering Units for millivolt thermocouple or CJC inputs which you must compute to fit your application s temperature or voltage resolution Local system A control system with I O chassis within several feet of the processor and using 1746 C7 or 1746 C9 ribbon cable for communication LSB least significant bit The bit that represents the smallest value within a string of bits The weight of this value is defined as the full scale range divided by the resolution Multiplexer A switching system that allows several input signals to share a common A D converter Normal mode rejection differential mode rejection A logarithmic measure in dB of a device s ability to reject noise signals between or among circuit signal conductors but not between the equipment grounding conductor or signal reference structure and the signal conductors Remote system A control system where the chassis can be located several thousand feet from the processor chassis Chassis communication is via the 1747 SN Scanner and 1747 ASB Remote I O Adapter Resolution The smallest detectable change in a measurement typically expressed in engineering units e g 0 15xC or as number of bits For example a 12 bit value has
60. ection between input and ground Greater than 100 dB at 50 60 Hz Input Filter Cut Off Frequencies e 2 6 Hz at 10 Hz filter frequency e 13 1 Hz at 50 Hz filter frequency e 15 72 Hz at 60 Hz filter frequency e 65 5 Hz at 250 Hz filter frequency Greater than 100 dB at 50 60 Hz Calibration Module autocalibrates at power up and approximately every two minutes afterward Input Over voltage Protection 30V dc continuous 600W pulsed for 1 ms Isolation 500V dc for 1 minute between inputs and chassis ground and between inputs and backplane 12 5V dc continuous between channels Publication 1746 UM022B EN P January 2005 A 2 Module Specifications Physical Specifications Environmental Specifications Publication 1746 UM022B EN P January 2005 LED Indicators 9 green status indicators one for each of 8 channels and one for module status Module ID Code 3533 Recommended Cable for thermocouple inputs Appropriate shielded twisted pair thermocouple extension wire for mV inputs Belden 8761 or equivalent Maximum Wire Size One 14 AWG wire or two 22 AWG wires per terminal 1 Referto the thermocouple manufacturer for the correct extension wire Operating Temperature 0 C to 60 C 32 F to 140 F Storage Temperature 40 C to 85 C 40 F to 185 F Relative Humidity 5 to 95 without condensation Certification UL and CUL approved Haza
61. ering units x1 F above 3276 7 F Software treats it as an over range error 1746 NT8 Thermocouple Module Channel Data Word Resolution Data Format Input Engineering Units x10 Engineering Units x1 Scaled for PID Proportional Counts Type Celsius Fahrenheit Celsius Fahrenheit Celsius Fahrenheit Celsius Fahrenheit J 1 C step 1 F step 1 C step 1 F step 0 0592 C step 0 1066 F step 0 0148 C step 0 0266 F step K 1 C step 1 F step 1 C step 1 F step 0 1001 C step 0 1802 F step 0 0250 C step 0 0450 F step T 1 C step 1 F step 1 C step 1 F step 0 0409 C step 0 0736 F step 0 0102 C step 0 0184 F step E 1 C step 1 F step 1 C step 1 F step 0 0775 C step 0 1395 F step 0 0194 C step 0 0349 F step R 1 C step 1 F step 1 C step 1 F step 0 1079 C step 0 1942 F step 0 0270 C step 0 0486 F step S 1 C step 1 F step 1 C step 1 F step 0 1079 C step 0 1942 F step 0 0270 C step 0 0486 F step B 1 C step 1 F step 1 C step 1 F step 0 0928 C step 0 1670 F step 0 0232 C step 0 0417 F step N 1 C step 1 F step 1 C step 1 F step 0 0793 C step 0 1428 F step 0 0198 C step 0 0357 F step 50 mv 0 1mV step 0 1mV step 0 1mV step 0 1mV step 6 104yV step 6 104yuV step 1 526uV step 1 526yV step 100 mv 0 1mV step 0 1mV step 0 1mV step 0 1mV step 12 21uV step 12 210V step
62. eturned United States Contact your distributor You must provide a Customer Support case number see phone number above to obtain one to your distributor in order to complete the return process Outside United Please contact your local Rockwell Automation representative for States return procedure Power Control and Information Solutions Headquarters Americas Rockwell Automation 1201 South Second Street Milwaukee WI 53204 2496 USA Tel 1 414 382 2000 Fax 1 414 382 4444 Europe Middle East Africa Rockwell Automation Vorstlaan Boulevard du Souverain 36 1170 Brussels Belgium Tel 32 2 663 0600 Fax 32 2 663 0640 Asia Pacific Rockwell Automation Level 14 Core F Cyberport 3 100 Cyberport Road Hong Kong Tel 852 2887 4788 Fax 852 2508 1846 Publication 1746 UM022B EN P January 2005 Supersedes Publication 1746 6 22 July 1999 Copyright 2005 Rockwell Automation Inc All rights reserved Printed in the U S A
63. ghout this manual when necessary we use notes to make you aware of safety considerations Identifies information about practices or circumstances that can cause an explosion in a hazardous environment which may lead to personal injury or death property damage or economic loss IMPORTANT Identifies information that is critical for successful application and understanding of the product ATTENTION Identifies information about practices or circumstances that can lead to personal injury or death property damage or economic loss Attentions help you e identify a hazard avoid a hazard recognize the consequence THA Way Labels may be located on or inside the equipment e g drive or motor to alert people that dangerous voltage may be present E BURN HAZARD Labels may be located on or inside the equipment e g drive or motor to alert people that surfaces may be dangerous temperatures Preface Module Overview Installing And Wiring Your Module Considerations Before Using Your Module Table of Contents Who Should Use This Manual 004 P 1 What This Manual COyetso suia scii x ado P 1 Related Documentation vu 3 942 AER ave xa yd P 2 Common Techniques Used in this Manual P 2 Chapter 1 General Description ps 2 3o Pra EEG eles FP ERG Ra Red 1 1 Input Rangese ovate E WE ST E PS 1 1 Hardware Features S eos pre eu E Vade RES V ps 1 2 Diagnostic LEDs
64. he Scaled for PID and Proportional Counts selections provide the highest NT8 display resolution but also require you to manually convert the channel data to real Engineering Units The equations below show how to convert from Scaled for PID to Engineering Units Engineering Units to Scaled for PID Proportional Counts to Engineering Units and Engineering Units to Proportional Counts To perform the conversions use the defined temperature or millivolt range for the channel s input type See the Channel Data Word Format table on page 4 8 The lowest possible value for an input type is Siow and the highest possible value is Shen Effective Resolutions The effective resolution for an input channel depends upon the filter frequency selected for that channel Scaling Examples Channel Configuration Data and Status 4 7 Scaled for PID to Engineering Units Equation Engineering Units Equivalent Si oy Suigu Stow x Scaled for PID value displayed 16384 Data Assume type J input type scaled for PID display type channel data 3421 Want to calculate C equivalent From Channel Data Word Format table Sj gy 210 C and Spig 760 C Solution Engineering Units Equivalent 210 C 760 C 210 C x 3421 16384 7 46 C Engineering Units to Scaled for PID Equation Scaled for PID Equivalent 16384 x Engineering Units desired S gy SHIGH S gy Data Assume type J input type scale
65. he module sets this fault bit when it detects any of the following configuration errors configuration bits 1 through 4 invalid input type 1010 1011 1100 1101 or 1110 configuration bits 12 through 14 invalid non zero bit setting e invalid data acquisition of an input channel the filter frequency selected for the valid channel currently fails auto calibration range checks Module Status LED Green The module status LED indicates when the module detects a non recoverable fault at power up or during operation For this type of fault the module no longer communicates with the SLC processor e disables all channels e clears all data and status words A module failure is non recoverable and requires the assistance of your local Allen Bradley distributor I O error codes appear in word S 6 of the SLC processor status file The first two digits of the error code identify the slot Gn hexadecimal with the error The last two digits identify the I O error code in hexadecimal The error codes that apply to your module include Gin hexadecimal e 50 through 5E 71 watchdog error e 90 through 94 For a description of the error codes refer to the SLC 500 Instruction Set Reference Manual publication 1746 RMO001 Publication 1746 UM022B EN P January 2005 6 6 Troubleshooting Your Module Troubleshooting Flowchart LEDs odule
66. in an open circuit condition depend upon the selection of bits 7 and 8 If zero is selected 00 the channel data word is forced to 0 during an open circuit condition Selecting maximum forces the 01 channel data word value to its full scale value during an open circuit condition The full scale value is determined by the selected input type and data format Selecting minimum forces the 10 channel data word value to its low scale value during an open circuit condition The low scale value is determined by the selected input type and data format Disabling the open circuit selection 11 may result in unintended operation on a failure Generally with the open circuit option disabled the data word remains unchanged The open circuit error bit and the channel LED flags the condition until the error is resolved Publication 1746 UM022B EN P January 2005 4 10 Channel Configuration Data and Status Publication 1746 UM022B EN P January 2005 For example if channel one is configured as a thermocouple type when the CJC breaks in an open circuit condition if open circuit detection is disabled the data word remains unchanged If the circuit selection is set at minimum the data word is set to the low scale value for the range and format Enabling the open circuit function adds approximately 45 ms to the channel update time Disabling the open circuit detection removes the time adder CJC sensors do not require the additional time
67. ions are based on maximum hardware software error and maximum CJC inaccuracy over temperature Module Specifications A 7 Thermocouple Type Thermocouple Reference Point Error J 275 C 527 F 3 0 C 5 4 F K 550 C 1022 F 3 0 C 5 4 F T 65 C 149 F 3 4 C 6 12 F E 365 C 689 F 2 5 C 4 5 F R 885 C 1625 F 6 5 C 11 7 F S 885 C 1625 F 7 2 C 12 96 F B 1060 C 1940 F 8 4 C 15 12 F N 500 C 932 F 3 0 C 5 4 F The diagrams that follow for each thermocouple type give data for a sample module over the input range of the thermocouple over temperature Thermocouples are usually parabolic in their pV to C curves Normally at the ends of any given thermocouple range the ratio of change in temperature increases as a result of a change in voltage In other words at the ends a smaller change in voltage results in a larger change in C The data that follows gives an idea of a sample module s error over the thermocouple range versus at a single reference point as provided with the tables above TIP The data was recorded at 60 Hz Values at 10 Hz and 50 Hz would be comparable Publication 1746 UM022B EN P January 2005 A 8 X Module Specifications Deviation Voltage mV Publication 1746 UM022B EN P January 2005 Deviation Voltage mV 0 02 0 04 0 06 uV Err 100mV Span Prop Cts 60 Hz 0 C 25 C 60 C
68. iringing and Grounding Guidelines 1747 UM011 SLC 500 Modular Modular Hardware Style User Manual 1747 6 21 Installation amp Operation Manual for Fixed Hardware Style Programmable Controllers 1747 RM001 SLC 500 Instruction Set Reference Manual AG 7 1 Allen Bradley Industrial Automation Glossary If you would like to view and download the publication go to Literature Library at http www rockwellautomation com literature order printed copies contact your Allen Bradley Distributor or Rockwell Automation Sales Office Common Techniques Used The following conventions are used throughout this manual in this Manual Bulleted lists such as this one provide information not procedural steps e Numbered lists provide sequential steps or hierarchical information Text in this font indicates words or phrases you should type Key names appear in bold capital letters within brackets for example ENTER Publication 1746 UM022B EN P January 2005 Chapter 1 General Description Module Overview This chapter describes the thermocouple mV input module and explains how the SLC 500 processor reads thermocouple or millivolt analog input data from the module Read this chapter to familiarize yourself further with your thermocouple mV analog input module This chapter covers general description and hardware features an overview of system and module operation block diagram of channel input circuits This
69. it error bits of each channel and set an alarm in the processor if one of the thermocouples opens An open circuit error can occur if the thermocouple breaks one of the thermocouple wires gets cut or disconnected from the terminal block or if the CJC sensors are not installed or are damaged IMPORTANT If a CJC input is not installed or is damaged all enabled thermocouple alarms are set and all enabled thermocouple The example shows how to automatically switch between reading the channel status words and channel sensor data words Specifically this example shows a simple method of utilizing a timer to periodically switch between reading the channel status and data words The program utilizes a timer accumulator value to determine when to set up the configuration words and when to read in the channel status and channel data information The channel status information is copied from the 1 2 0 to 1 2 7 registers into registers N7 10 to N7 17 The channel data information is copied from I 2 0 to I 2 7 into registers N7 0 to N7 7 This allows sensor data and channel status information to be accessed at any time from these registers However when the module channels are configured to read sensor data the channel status words as reflected in N7 10 to N7 17 are not being dynamically updated and vice versa 0000 0001 0002 0003 0004 Monitoring Channel Status Bits Example Programming Examples 5 9
70. junction compensation 2 11 preparing and wiring cables 2 9 Rockwell Automation Support www rockwellautomation com Rockwell Automation provides technical information on the web to assist you in using our products At http support rockwellautomation com you can find technical manuals a knowledge base of FAQs technical and application notes sample code and links to software service packs and a MySupport feature that you can customize to make the best use of these tools For an additional level of technical phone support for installation configuration and troubleshooting we offer TechConnect Support programs For more information contact your local distributor or Rockwell Automation representative or visit http support rockwellautomation com Installation Assistance If you experience a problem with a hardware module within the first 24 hours of installation please review the information that s contained in this manual You can also contact a special Customer Support number for initial help in getting your module up and running United States 1 440 646 3223 Monday Friday 8am 5pm EST Outside United Please contact your local Rockwell Automation representative for any States technical support issues New Product Satisfaction Return Rockwell tests all of our products to ensure that they are fully operational when shipped from the manufacturing facility However if your product is not functioning and needs to be r
71. ladder program makes the change to the time the 1746 NT8 supplies a data word using that new configuration information Also the ladder program should use the thermocouple temperature data location N10 20 for thermocouple temperature readings and data location N10 12 for CJC temperature readings Publication 1746 UM022B EN P January 2005 5 4 Programming Examples During the first pass send the channel configuration data to the thermocouple module NT8_CONFIGURATION First Pass S 1 COP 0000 JE Copy File 15 Source N10 0 Dest 0 1 0 Length 8 CHECKING CJC B3 6 CUD 4 If not Checking CJC copy Channel 0 temperature data into data location for use Temperature control logic should use N10 20 rather than the TC image 1 1 0 to eliminate problems during CJC checking CHECKING CJC CHO TEMP B3 6 MOV 0001 4 Move 4 Source E1 0 3744 lt Dest N10 20 3744 lt Copy temperature data from Channels 1 to 7 to data registers for use COP 0002 Copy File m Source 1 1 1 Dest N10 21 Length T Repeating 60 seconds timer T 11 0 which starts the CJC check cycle CJC_CYCLE_TMR DN CJC_CYCLE_TMR T11 0 TON 0003 jt Timer On Delay CEND DN Timer T11 0 Time Base 1 0 L DN Preset 60 lt Accum 20 lt Every 60 seconds start CUC check cycle by changing Channel 0 configuration word and latching Checking CJC bit B3 100 CJC_CYCLE_TMR DN NT8_CONFIGUR
72. lectrical noise further If the field wiring must cross ac or power cables ensure that they cross at right angles For high immunity to electrical noise use Belden 8761 shielded twisted pair or equivalent wire for millivolt sensors or use shielded twisted pair thermocouple extension lead wire specified by the thermocouple manufacturer Using the incorrect type of convention thermocouple extension wire or not following the correct polarity may cause invalid readings Ground the shield drain wire at only one end of the cable The preferred location is at the shield connections on the terminal block Refer to IEEE Std 518 Section 6 4 2 7 or contact your sensor manufacturer for additional details Keep all unshielded wires as short as possible Excessive tightening can strip a screw Tighten screws to 0 25 Nm 2 2 in lb or less based on UL 1059 CSA C22 2 No 158 VDE 0110B 2 79 standards Follow system grounding and wiring guidelines found in your SLC 500 Modular Hardware Style User Manual publication 1747 UM011 or 1747 SLC 500 Fixed Hardware Style User Manual publication 1747 6 21 Installing And Wiring Your Module 2 9 Preparing and Wiring the Cables To prepare and connect cable leads and drain wires follow these steps Remove foil shield and drain wire Signal Wires from sensor end of the cable Drain Wire Signal Wires 1 At each end of the cable strip some casing to expose individual wires 2
73. module mounts into 1746 I O chassis for use with SLC 500 fixed and modular systems The module stores digitally converted thermocouple mV analog data in its image table for retrieval by all fixed and modular SLC 500 processors The module supports connections from any combination of up to eight thermocouple mV analog sensors Input Ranges The following tables define thermocouple types and associated temperature ranges and the millivolt analog input signal ranges that each of the module s input channels support To determine the practical temperature range of your thermocouple refer to the specifications in Appendix A Thermocouple Temperature Ranges Type CTemperature Range F Temperature Range J 210 C to 760 C 346 F to 1400 F K 270 C to 1370 C 454 F to 2498 F T 270 C to 400 C 454 F to 752 F B 300 C to 1820 C 4572 C to 43308 F E 270 C to 1000 C 454 F to 1832 F R 0 C to 1768 C 432 F to 3214 F Publication 1746 UM022B EN P January 2005 1 2 Module Overview Type CTemperature Range F Temperature Range S 0 C to 1768 C 32 F to 3214 F N 0 C to 1300 C 32 F to 2372 F CJC Sensor 25 C to 105 C 13 F to 221 F Millivolt Input Ranges 50 to 50 mV 100 to 100 mV Each input channel is individually configured for a specific input device and provides open circuit over range and under range detection a
74. ncy you selected in the configuration word Open Circuit E This bit is set 1 whenever a configured channel detects an open circuit condition at its input An open circuit at the CJC sensor also flags this error if the channel input type is either thermocouple or CJC temperature A range error on the CJC sensor also flags this bit if the input type is thermocouple Under Range Error Bit 13 This bit is set 1 whenever a configured channel detects an under range condition for the channel data An under range condition exists when the input value is equal to or below the specified lower limit of the particular sensor connected to that channel Channel Configuration Data and Status 4 15 Over Range Error Bit 14 This bit is set 1 whenever a configured channel detects an over range condition for the channel data An over range condition exists when the input value is equal to or above the specified upper limit of the particular sensor connected to that channel Channel Error Bit 15 This bit is set 1 whenever a configured channel detects an error in the configuration word or an error has occurred while acquiring the A D data value If during the auto calibration process the module detects an out of range condition for the filter frequency selected for the channel the channel error bit is set An out of range condition occurring during auto calibration would be the result of an overly noisy environment whereby the module
75. nd Exposed Junction Thermocouples B 3 Grounded Junction As shown in the following illustration the shield input terminals are internally connected together which are then connected to chassis ground Using grounded junction thermocouples with electrically conductive sheaths removes the thermocouple signal to chassis ground isolation of the module This is inherent to the thermocouple construction In addition if multiple grounded junction thermocouples are used the module s channel to channel isolation is removed since there is no isolation between signal and sheath and the sheaths are tied together It should be noted that the isolation is removed even if the sheaths are connected to chassis ground at a location other than the module since the module is connected to chassis ground 1746 NT8 Grounded junction with nonconductive protective sheath A O gt Ort Metal sheath with electrical continuity to thermocouple signal wires floating ground connection For grounded junction thermocouples it is recommended that they have protective sheaths made of electrically insulated material e g ceramic or the metal protective sheaths be floated The metal sheaths would need to be floated with respect to any path to chassis ground or to another thermocouple metal sheath This means the metal sheath must be insulated from electrically conductive process material and have all connections to chassis ground broken It should
76. nd indication Hardware Features The module fits into any single slot for I O modules in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis 1746 A2 except the zero slot which is reserved for the processor It is a Class 1 module using 8 input words and 8 output words The module contains a removable terminal block providing connections for eight thermocouple and or analog input devices On the terminal block are two cold junction compensation CJC sensors that compensate for the cold junction at ambient temperature It should also be noted there are no output channels on the module Configure the module with software rather than with jumpers or switches TIAM There is a jumper PD on the circuit board The module is shipped with the jumper in the up position as illustrated below Do not change the position of JP1 The jumper is used for test purposes only 1 Output impedance of input device must be less than 100 ohm to meet accuracy specifications 2 Requires use of a Block Transfer when used in a remote rack with a 1747 ASB Publication 1746 UM022B EN P January 2005 Module Overview 1 3 System Overview Channel Status Side Label LEDs green INPUT sewer Door Label 5 E Module Status mns LEDs green Lzsmessem A to Removable Terminal Block CJC Sensors P d gt e mm IHHHHHEBHHEBHBHBBBHHBB A
77. nditions follow Channel Status Bit 0 The channel status bit indicates operational state of the channel When the channel enable bit is set in the configuration word the thermocouple module configures the selected channel and takes a data sample for the channel data word before setting this bit in the status word Input Type Status Bits 1 through 4 The input type bit field indicates what type of input signal you have configured for the channel This field reflects the input type defined in the channel configuration word Publication 1746 UM022B EN P January 2005 4 14 Channel Configuration Data and Status Publication 1746 UM022B EN P January 2005 Data Format Type Status Bits 5 and 6 The data format bit field indicates the data format you have defined for the channel This field reflects the data type selected in bits 5 and 6 of the channel configuration word Open Circuit Type Status Bits 7 and 8 The open circuit bit field indicates how you have defined the open circuit bits configuration word and therefore the response of the thermocouple module to an open circuit condition This feature is active for all input types including CJC temperature input Temperature Units Type Status Bit 9 The temperature units field indicates the state of the temperature units bit in the configuration word bit 9 Channel Filter Frequency Bits 10 and 11 The channel filter frequency bit field reflects the filter freque
78. ng provides minimal noise filtering e 60 Hz setting provides 60 Hz AC line noise filtering e 50 Hz setting provides 50 Hz AC line noise filtering 10 Hz setting provides both 50 Hz and 60 Hz AC line noise filtering When a CJC input type is selected filter frequency is ignored To maximize the speed versus resolution trade off CJC inputs are sampled at 60 Hz Unused Bits Bits 12 through 14 Bits 12 14 are not defined Ensure these bits are always cleared 0 Select Input Image Type Bit 15 The input image type bit allows you to select data or status information in the channel s input image word When set 1 the module places channel data in the corresponding input image word When the bit is cleared 0 the module places channel status in the corresponding input image word The actual thermocouple or millivolt input data values or channel status reside in I e 0 through I e 7 of the thermocouple module input image file The data values present depend on the input type and data formats you have selected When an input channel is disabled its data word is reset 0 Module Input Image Data Status Word Channel 0 Channel Data Status Word Channel 1 Channel Data Status Word Channel 2 Channel Data Status Word Channel 3 Channel Data Status Word Channel 4 Channel Data Status Word Channel 5 Channel Data Status Word Channel 6 Channel Data Status Word 1 1 1 if L i 1 1
79. nge condition the module sets a unique bit in the channel status word and causes the channel status LED to flash The SLC processor reads the converted thermocouple or millivolt data from the module at the end of the program scan or when commanded by the ladder program After the processor and module determine that the data transfer was made without error the data can be used in your ladder program Module Overview 1 5 Module Operation The module s input circuitry consists of eight differential analog inputs multiplexed into an A D convertor The A D convertor reads the analog input signals and converts them to a digital value The input circuitry also continuously samples the CJC sensors and compensates for temperature changes at the cold junction terminal block Module Addressing The module requires eight words each in the SLC processor s input and output image tables Addresses for the module in slot e are as follows I e 0 7 thermocouple mV or status data for channels 0 to 7 respectively dependent on bit in configuration word O e 0 7 configuration data for channels 0 to 7 respectively See Module Addressing on page 3 2 to see the module s image table Publication 1746 UM022B EN P January 2005 1 6 Module Overview Block Diagram Terminal Block Module Circuitry User Selected Filter Frequency Analog to a Digital Digital Converter
80. nput Type Channel Disable Channel Enable Thermocouple J Thermocouple K Thermocouple T Thermocouple E Thermocouple R Thermocouple S Thermocouple B of Ol OF Ol OA Ao Thermocouple N 50 to 50 mV 100 to 100 mV Invalid Invalid Invalid Invalid Invalid CJC temperature O O O O O O O O co Data Format Engineering Units x 1 Engineering Units x 10 Scaled for PID Proportional counts co c Open Circuit Zero on open circuit Max on open circuit Min on open circuit Disabled co oco c Temperature units oc 2 oF 2 Channel filter frequency 10 Hz input filter 50 Hz input filter 60 HZ input filter 250 Hz input filter oO o o Unused Unused Invalid Input Image Type Status Word 0 Data Word 1 1 For engineering units x 1 values are expressed in 0 1 degrees or 0 01 mV For engineering uni 2 When millivolt input type is selected the bit setting fo 3 Ensure unused bits 12 through 14 are always set to zero Publication 1746 UM022B EN P January 2005 temperature units is ignored s x 10 values are expressed in 1 0 deg rees or 0 1 mV Channel Configuration Data and Statu
81. ntrols bit O of the configuration file and sets whether Enabled the channel is being used Input Type Sets bits 1 to 4 and sets the type of thermocouple being used Temperature Sets bit 9 for temperature C or F Units Filter Sets bits 10 and 11 and determine the frequency of the Frequency channel filter Broken Input Sets bits 7 and 8 and determines how to handle an open circuit condition Data Format Sets bits 5 and 6 and determines the scale of the data Input Image Type Sets the input to status word or data word and sets bit 15 Configuring the 1746 NT8 Module with RSLogix 500 C 5 Each tab edits the word of configuration data for that channel for a total of 8 words of configuration data 5 Press OK to set the parameters The following dialog box appears Added Rung Parameters x Integer Data File Number js m E Integer Data Element o Cancel Rung to be inserted IC 2 1 15 COP N9 0 800 1 0 8 At Program File Number 2 Top M 6 Choose the data file for the configuration and the location for the configuration rung within your ladder logic program 7 Press OK The following rung is inserted into the program Rung Inserted into program logic Initialization for Slot 1 1746 NTS Analog 8 Ch Thermocouple Input First Pass S 0000 This rung sends the configuration to the module on the first program scan The source and destination of the COP instruction may
82. o observe this precaution can cause personal injury and equipment damage Safety is always the most important consideration Actively think about the safety of yourself and others as well as the condition of your equipment Consider the following Indicator Lights When the module status LED on your module is illuminated your module is receiving power Activate Devices When Troubleshooting Never reach into a machine to activate a device the machine may move unexpectedly Use a wooden stick Publication 1746 UM022B EN P January 2005 7 2 Maintaining Your Module And Safety Considerations Publication 1746 UM022B EN P January 2005 Stand Clear Of Machinery When troubleshooting a problem with any SLC 500 system have all personnel remain clear of machinery The problem may be intermittent and the machine may move unexpectedly Have someone ready to operate an emergency stop switch ATTENTION Possible Equipment Operation Never reach into a machine to actuate a switch Also remove all electrical power at the main power disconnect switches before checking electrical connections or inputs outputs causing machine motion Failure to observe these precautions can cause personal injury or equipment damage Safety Circuits Circuits installed on machinery for safety reasons like over travel limit switches stop push buttons and interlocks should always be hard wired to the master control relay These
83. r the CJC se connections Correct and retry No Is problem corrected Contact your local No y No Contact your local An open circuit condition Allen Bradley Mi uen Bit12 is present Check channel Allen Bradley distributor set 1 and CJC wiring for open or distributor loose connections Retry distributor Publication 1746 UM022B EN P January 2005 Chapter Preventive Maintenance Safety Considerations Maintaining Your Module And Safety Considerations Read this chapter to familiarize yourself with preventive maintenance safety considerations The National Fire Protection Association NFPA recommends maintenance procedures for electrical equipment Refer to article 70B of the NFPA for general safety related work practices The printed circuit boards of your module must be protected from dirt oil moisture and other airborne contaminants To protect these boards install the SLC 500 system in an enclosure suitable for its operating environment Keep the interior of the enclosure clean and whenever possible keep the enclosure door closed Also regularly inspect the terminal connections for tightness Loose connections may cause a malfunction of the SLC system or damage to the components ATTENTION Possible Loose Connections Before inspecting connections always ensure that A incoming power is OFF Failure t
84. rd 4 2 Element Word Delimiter Delimiter Chapter 4 provides detailed bit information about the content of the data word and the status word The thermocouple module uses a digital filter that provides high frequency noise rejection for the input signals The digital filter is programmable allowing you to select from four filter frequencies for each channel The digital filter provides the highest noise rejection at the selected filter frequency The graphs to follow show the input channel frequency response for each filter frequency selection Selecting a low value i e 10 Hz for the channel filter frequency provides the best noise rejection for a channel but it also increases the channel update time Selecting a high value for the channel filter frequency provides lower noise rejection but decreases the channel update time Publication 1746 UM022B EN P January 2005 3 4 Considerations Before Using Your Module Publication 1746 UM022B EN P January 2005 The following table shows the available filter frequencies cut off frequency step response and a DC effective resolution for each filter frequency Cut off frequency Step Response Time and Effective Resolution Based on Filter Frequency Filter Frequency Cut Off Frequency Step Response ADC Effective Resolution 10 Hz 2 62 Hz 400 ms 20 5 50 Hz 13 1 Hz 80 ms 19 0 60 Hz 15 72 Hz 66 7 ms 19 0 250 Hz 65 5 Hz 16 ms 15 5 The step respon
85. rdous Environment Classification Class Division 2 Hazardous Environment Groups A B C D EMC CE compliant for all applicable directives C Tick compliant for all applicable acts Input Specifications Type of Input Selectable Module Specifications Thermocouple Type J 210 C to 760 C 346 F to 1400 F Thermocouple Type K 270 C to 1370 C 454 F to 2498 F Thermocouple Type T 270 C to 400 C 454 F to 752 F Thermocouple Type E 270 C to 1000 C 454 F to 1832 F Thermocouple Type R 0 C to 1768 C 32 F to 3214 F Thermocouple Type S 0 C to 1768 C 32 F to 3214 F Thermocouple Type B 300 C to 1820 C 572 F to 3308 F Thermocouple Type N 0 C to 1300 C 32 F to 2372 F Millivolt 50mV dc to 50mV dc Millivolt 100mV dc to 100mV dc Thermocouple Linearization NIST ITS 90 standard Cold Junction Compensation Accuracy 1 72 C 25 C to 105 C Module Input Impedance Greater than 10MW Input Device Impedance Output impedance of input device must be less than 100 ohm to meet accuracy specifications Temperature Scale Selectable C or F and 0 1 C or 0 1 F DC Millivolt Scale Selectable 0 1 mV or 0 01 mV Open Circuit Detection Selectable Upscale Downscale Zero or Disabled Time to Detect Open Circuit One channel cycle time Input Step Response
86. rror 20 00 15 00 10 00 5 00 0 00 YL gh d S SA ES Viel AV oS dde SIR MAH 9 os S NI S N SS Sos SINS PSP dq lama Publication 1746 UMO22B EN P January 2005 A 6 Module Specifications 90 00 80 00 70 00 60 00 50 00 40 00 30 00 uV Deviation 20 00 10 00 uV Err 100mV Span Prop Cts 60 Hz 60 C uV Error dv gk A9 BY oS de Sv CSN do A o qb de MV cb e HAV o qd de FORSE ESSAIS RADEON Publication 1746 UM022B EN P January 2005 SI gt NS SIRIA mV Input Thermocouple The following table provides the total error expected of the thermocouple based on the thermocouple type and the given reference point at 25 C The calculations assumed typical hardware software error and typical CJC accuracy at 25 C Thermocouple Type Thermocouple Reference Point Error J 275 C 527 F 1 4 C 2 52 F K 550 C 1022 F 1 5 C 2 7 F T 65 C 149 F 1 39C 2 34 F E 365 C 689 F 1 39C 2 34 F R 885 C 1625 F 3 6 C 6 48 F S 885 C 1625 F 3 4 C 6 129F B 1060 C 1940 F 2 7 C 4 86 F N 500 C 932 F 1 3 C 2 34 F The following table provides the total error expected over the temperature range of the module 0 to 60 C for each thermocouple based upon the type and the given reference point at the extremes of the temperature range 0 or 60 C The calculat
87. s 4 14 input type status 4 14 open circuit 4 15 open circuit type status 4 14 over range error 4 15 temperature units type status 4 14 under range error 4 15 channel step response 3 6 channel turn off 3 8 channel turn on 3 8 cold junction compensation 2 11 config words 3 2 configuration with RSLogix 500 B 1 D data words 3 3 diagnostic LEDs 1 3 Index diagnostics at powerup 6 1 diagnostics channel 6 1 E electrical specifications A 1 electrostatic damage 2 1 environmental specifications A 2 F fixed 1 0 chassis module compatibility 2 3 fixed 1 0 current draw 2 3 G general considerations 2 4 general description 1 1 diagnostic LEDs 1 3 hardware features 1 2 input ranges 1 1 H hardware features 1 2 ID code 3 1 input image data words and status words 3 3 input ranges 1 1 millivolt input ranges 1 2 thermocouple temperature ranges 1 1 input specifications A 3 millivolt A 4 overall accuracy A 4 thermocouple A 6 install 2 5 installing the module 2 1 interfacing to PID instruction 5 7 interpreting 10 error codes 6 5 isolation B 2 exposed junction B 4 grounded junction B 3 L LED troubleshooting 6 3 linear millivolt device compatibility 1 7 Publication 1746 UM022B EN P January 2005 2 Index millivolt input ranges 1 2 modular system 2 2 module addressing 1 5 3 2 input image data words and status words 9 9 output image config words 3 2 module and channel diagnostics 6 1 module general de
88. s 4 5 Select Channel Enable Bit 0 Use the channel enable bit to enable a channel The thermocouple module only scans enabled channels To optimize module operation and minimize throughput times unused channels should be disabled by setting the channel enable bit to zero default value When set 1 the channel enable bit is used by the module to read the configuration word information selected While the enable bit is set modification of the configuration word may lengthen the module update time for one cycle If any change is made to the configuration word the change is reflected in the status word before new data is valid described on page 4 11 While the channel enable bit is cleared 0 the associated channel data status word values are cleared After the channel enable bit is set 1 the associated channel data status word remains cleared until the thermocouple module sets the channel status bit bit 0 in the channel status word Select Input Types Bits 1 through 4 The input type bit field lets you configure the channel for the type of input device you have connected to the module Valid input devices are types J K T E R S B and N thermocouple sensors and 50 mV and 100 mV analog input signals The channel can also be configured to read the cold junction temperature calculated for that specific channel When the cold junction compensation CJC temperature is selected the channel ignores the physical input signal
89. scription 1 1 module ID code 3 1 module install 2 5 module operation 1 5 module removal 2 5 monitoring channel status bits 5 8 0 output image config words 3 2 overview 1 1 P physical specifications A 2 PLC 5 example 5 13 power requirements 2 2 fixed 1 0 chassis compatibility 2 3 modular system 2 2 preparing and wiring cables 2 9 preventive maintenance 7 1 programming examples 5 1 S safety considerations 7 1 scaling examples 4 7 channel filter frequency 4 10 input image type 4 11 open circuit state 4 9 temperature units 4 10 unused bits 4 11 SLC 500 example 5 15 slot disabling 3 9 input response 3 9 output response 3 9 specifications Publication 1746 UM022B EN P January 2005 electrical A 1 environmental A 2 input A 3 physical A 2 status words 3 3 system operation 1 4 system overview 1 3 block diagram 1 6 linear millivolt device compatibility 1 7 module addressing 1 5 module operation 1 5 operation 1 4 T terminal block removal 2 6 thermocouple A 6 thermocouple temperature ranges 1 1 thermocouple types B 1 exposed junction B 2 grounded junction B 2 insulated junction B 2 ungrounded junction B 2 troubleshooting 6 1 channel error 6 5 channel status LED 6 4 interpreting IO error codes 6 5 LED table 6 3 module status LED 6 5 open circuit detection 6 4 out of range detection 6 4 U update time 3 7 calculation 3 8 V verifying configuration changes 5 3 W wiring module 2 1 2 7 cold
90. se When removing or installing the terminal block be careful not to damage the CJC sensors Publication 1746 UM022B EN P January 2005 Installing And Wiring Your Module 2 7 Terminal block diagram with CJC sensors Terminal Block Release Screws 9 CJC Sensors gt Recommended Torque wiring screws 0 25 Nm 2 2 in Ib release screws 0 25 Nm 2 2 in Ib CJC Sensors x Terminal Block Release Screws o ATTENTION Possible Equipment Operation Before wiring your module always disconnect power from the SLC 500 system and from any other source to the module gt Failure to observe this precaution can cause unintended equipment operation and damage Publication 1746 UM022B EN P January 2005 2 8 Installing And Wiring Your Module Wiring Your Module Publication 1746 UM022B EN P January 2005 Follow these guidelines to wire your input signal cables Power input and output I O wiring must be in accordance with Class 1 Division 2 wiring methods Article 501 4 b of the National Electrical Code NFPA 70 and in accordance with the authority having jurisdiction Route thermocouple and millivolt signal wires as far as possible from sources of electrical noise such as motors transformers contactors and ac devices As a general rule allow at least 6 in about 15 2 cm of separation for every 120V ac of power Routing the field wiring in a grounded conduit can reduce e
91. se is calculated by a 4 x 1 filter frequency settling time Channel Cut Off Frequency The channel filter frequency selection determines a channel s cut off frequency also called the 3 dB frequency The cut off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation All frequency components at or below the cut off frequency are passed by the digital filter with less than 3 dB of attenuation All frequency components above the cut off frequency are increasingly attenuated as shown in the graphs on page 3 5 The cut off frequency for each input channel is defined by its filter frequency selection The table above shows the input channel cut off frequency for each filter frequency Choose a filter frequency so that your fastest changing signal is below that of the filter s cut off frequency The cut off frequency should not be confused with update time The cut off frequency relates how the digital filter attenuates frequency components of the input signal The update time defines the rate at which an input channel is scanned and its channel data word updated Considerations Before Using Your Module 3 5 Signal Attenuation with 10 Hz Input Filter 3dB 4 0r 20 40 60 80 Bs 140 160 180 200 I l l I l l I l 100 1 Amplitude in dB 120 l l l l I l l
92. ssfully configured BTW DN BIT N20 0 NT8 CONFIGURED B3 0 0002 A 13 Ifthe module is configured repeatedly read the NTS data NT8 CONFIGURED B30 0003 0004 BTR DN BIT N20 10 BTR ER BIT BTR CONTROL N20 10 BTR Block Transfer Read Rack Group Slot Control Block Data File Buffer File Requested Word Count Transmitted Word Count Control Block Length SLC processors with a 1747 SN series B RIO Scanner can use the block transfer instructions similarly to the PLC 5 This ladder example shows this implementation The data file elements N20 10 N20 17 contain the configuration data for the NT8 as defined in previous examples Publication 1746 UM022B EN P January 2005 5 16 Programming Examples Publication 1746 UM022B EN P January 2005 Chapter 6 Module and Channel Diagnostics Troubleshooting Your Module This chapter describes troubleshooting with channel status and module status LEDs It explains the types of conditions that might cause the module to flag an error and suggests what corrective action you could take Topics include module and channel diagnostics LED indicators e interpreting I O error codes troubleshooting flowchart The module operates at two levels e module level e channel level Module level operation includes functions such as powerup configuration and communication with the SLC processor Channel level operation includes functions such as data conversion an
93. te and the module s updated image table is not read When the processor re enables the module slot the current state of the module inputs are read by the processor during the subsequent scan Output Response The SLC processor may change the thermocouple module output data configuration as it appears in the processor output image However this data is not transferred to the thermocouple module The outputs are held in their last state When the slot is re enabled the data in the processor image is transferred to the thermocouple module Publication 1746 UM022B EN P January 2005 3 10 Considerations Before Using Your Module Publication 1746 UM022B EN P January 2005 Chapter 4 Channel Configuration Channel Configuration Data and Status Read this chapter to configure each input channel check each input channel s configuration and status Channel configuration words appear in the SLC processor s output image table as shown below Words 0 to 7 correspond to module channels 0 to 7 After module installation configure each channel to establish the way the channel operates e g thermocouple type temperature units etc Configure the channel by setting bits in the configuration word using your programming device The SLC configuration words are shown below SLC Output Image Configuration Words bit 15 bit 0 1 T i 1
94. the thermocouple module First Pass NT8_CONFIGURATION S 1 COP E Copy File 15 Source N10 0 Dest 0 3 0 Length 8 CEND gt Publication 1746 UM022B EN P January 2005 On power up bit S 1 15 is set for the first program scan During the first program scan the configuration data in N10 0 through N10 7 will be sent to the 1746 NT8 channel configuration words Automatic Monitoring Thermocouples and CJC Sensors Verifying Configuration Changes Programming Examples 5 3 The following example explains how to change data in the channel configuration word when the channel is currently enabled Example Execute a dynamic configuration change to channel 0 of the thermocouple module located in slot 1 of a 1746 chassis Periodically e g every 60 seconds change from monitoring an external type K thermocouple to monitoring the CJC sensors mounted on the terminal block The CJC reading gives a good indication of what the temperature is inside the control cabinet Finally set channel 0 back to type K thermocouple TTA MEE During configuration alteration the state of each modified channel can not be determined until after one module update time TIP N10 2 1 through N10 2 4 have the input type for type K Thermocouple 0001 N10 8 1 through N10 8 4 have the input type for CJC Temperature Sensor 1111 When executing a dynamic channel configuration change there is always a delay from the time the
95. ut image table Channel Configuration The channel configuration word consists of bit fields the settings of Procedure which determine how the channel operates This procedure looks at each bit field separately and helps configure a channel for operation Refer to the chart on page 4 4 and the bit field descriptions that follow for complete configuration information TIP When using RSLogix 500 version 6 10 or higher you can use the software s I O wizard to configure the NT8 channels Refer to Appendix C for more information 1 Determine which channels are used in your program and enable them Place a one in bit 0 if the channel is to be enabled Place a zero in bit 0 if the channel is to be disabled 2 Determine the input device type J K etc thermocouple Cor mV for a channel and enter its respective four digit binary code in bit field 1 through 4 of the channel configuration word 3 Select a data format for the data word Your selection determines how the analog input value from the A D converter will be expressed in the data word Enter your two digit binary code in bit field 5 and 6 of the channel configuration word 4 Determine the desired state for the channel data word if an open circuit condition is enabled and detected for that channel Enter the two digit binary code in bit field 7 and 8 of the channel configuration word Publication 1746 UM022B EN P January 2005 10 Channel Configuration Data and Status
96. y of Changes 2 Publication 1746 UM022B EN P January 2005 Who Should Use This Manual What This Manual Covers Preface Read this preface to familiarize yourself with this user manual This preface covers who should use this manual what this manual provides e related documents common techniques used in this manual Use this manual if you design install program or maintain a control system that uses SLC 500 controllers You should have a basic understanding of SLC 500 products You should also understand electronic process control and the ladder program instructions required to generate the electronic signals that control your application If you do not contact your local Rockwell Automation representative for the proper training before using these products This manual covers the 1746 NT8 thermocouple millivolt analog input module It contains the information you need to install wire use and maintain these modules It also provides diagnostic and troubleshooting help should the need arise Publication 1746 UM022B EN P January 2005 Preface 2 Related Documentation The following table lists several Rockwell Automation documents that may help you as you use these products Publication Number Title 1746 SG001 SLC 500 Systems Selection Guide SGI 1 1 Safety Guidlines for the Application Installation and Maintenance of Solid State Controllers 1770 4 1 Industrial Automation W

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