SLC 500™ RTD/Resistance Input Module
Contents
1. Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 19 RTD Temperature Ranges Resolution and Repeatability Input Type Temp Range Temp Range Resolution Repeatability 0 25 mA Excitation 1 0 mA Excitation Platinum 1000 200 C to 850 C 200 C to 850 C 0 1 C 0 2 C 3852 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 200 200 C to 850 C 200 C to 850 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 1562 F 0 1 F 0 4 F 5000 200 C to 850 C 200 C to 390 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 698 F 0 1 F 0 4 F 10008 200 C to 850 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1562 F 328 F to 122 F 0 1 F 0 4 F Platinum 1000 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 3916 2 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 200 200 C to 630 C 200 C to 630 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 1166 F 0 1 F 0 4 F 5000 200 C to 630 C 200 C to 380 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 698 F 0 1 F 0 4 F 1000Q 200 C to 630 C 200 C to 50 C 0 1 C 0 2 C 328 F to 1166 F 328 F to 122 F 0 1 F 0 4 F Copper 10 100 C to 260 C 100 C to 260 C 0 1 C 0 2 C 4262 3 328 F to 500 F 148 F to 500 F 0 1 F2. 0 4 F Nickel 1200 100 C to 260 C 100 C to 260 C 0 1 C 0 1 C 618 328 F to 500 F 328 F to 500 F 0 1 F 0 2 F Nickel 1200 80 C to 260 C 80 C to 260 C 0 1 C 0 1 C 672 2 328 F to 500 F 328 F to 500 F 0 1 F 0 2 F Nickel Iron 604Q 200 C to 200 C 200 C to 180 C 0 1 C 0 1 C 518 2 328 F to 392 F 328 F to 338 F 0 1 F 0 2 F 1 The temperature range for the 1000QRTD is dependent on the excitation current 2 The digits following the RTD type represent the temperature coefficient of resistance a which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a platinum RTD with a 0 00385 ohms ohm C or simply 0 00385 C 3 Actual value at 0 C is 9 04202 per SAMA standard RC21 4 1966 4 Actual value at 0 C is 100 per DIN standard Publication 1746 IN007C EN P December 2002 20 SLC 500 RTD Resistance Input Module Input Type Resistance Range Resistance Range Resolution Repeatability 0 25 mA 1 0 mA Excitation 28 Hz 50 60 Hz Excitation Resistance 150Q Oto 150Q 0 to 1500 0 010 0 04Q 500Q Oto 500Q 0 to 500Q 0 10 0 20 1000Q 0 0 to 10000 0 10 0 20 30002 0 to 30000 0 to 12000 0 10 0 20 The module accuracy is dependent on the RTD Resistance type the excitation current and the input filter selection The following table shows the module accuracy and tem
3. Slide the module into the chassis until both top and bottom retaining clips are secured Apply firm even pressure on the module to attach it to its backplane connector Never force the module into the slot 3 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Top and Bottom Module Release s Module Removal Procedure 1 Press the releases at the top and bottom of the module and slide the module out of the chassis slot 2 Cover all unused slots with the Card Slot Filler Catalog Number 1746 N2 Publication 1746 IN007C EN P December 2002 10 SLC 500 RTD Resistance Input Module Terminal Block Wiring and Removal The RTD module contains an 24 position removable terminal block The terminal pin out is shown below Disconnect power to the SLC before attempting to install ATTENTION remove or wire the removable terminal wiring block To avoid cracking the removable terminal block alternate the removal of the terminal block release screws Terminal Wiring Terminal screws accept a maximum of one 14 AWG 2 mm wire Tighten terminal screws only tight enough to immobilize wires Maximum torque on terminal screws is 0 25 Nm 2 25 in lb Sense 7 DDDDDDDDDDDDDDDDODDDDDODO 9 Release Screw Max Torque 0 25 Nm 2 25 in Ib Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 11 Terminal Block Removal If the terminal block is removed
4. WARNING statement applies to use in hazardous locations WARNING EXPLOSION HAZARD e Substitution of components may impair suitability for Class I Division 2 Do not replace components or disconnect equipment unless power has been switched off Do not connect or disconnect components unless power has been switched off All wiring must comply with N E C article 501 4 b Environnements dangereux Cet quipement est concu pour tre utilis dans des environnements de Classe 1 Division 2 Groupes A B C D ou non dangereux La mise en garde suivante s applique une utilisation dans des environnements dangereux D ER D EXPLOSI ATTENTION RU ME La substitution de composants peut rendre cet quipement impropre une utilisation en environnement de Classe 1 Division 2 Ne pas remplacer de composants ou d connecter l quipement sans s tre assur que l alimentation est coup e Ne pas connecter ou d connecter des composants sans s tre assur que l alimentation est coup e Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 5 Overview The RTD Resistance Temperature Detector module receives and stores digitally converted analog data from RTDs or other resistance inputs such as potentiometers into its image table for retrieval by all fixed and modular SLC 500 processors An RTD consists of a temperature sensing element connected by 2 3 or 4 w
5. 007C EN P December 2002 18 SLC 500 RTD Resistance Input Module Input Specifications RTD Types platinum nickel nickel iron copper For additional information on RTD types see page 21 Temperature Scale Selectable C or F and 0 1 C or 0 1 F Resistance Scale 1Q or 0 1Q for all resistance ranges except for 150Q or 0 1Qor 0 01Q for 150Q Selectable potentiometer Input Step Refer to the SLC 500 RTD Resistance Input Module User Manual publication number Response 1747 UM003A Channel Turn On Requires up to one module update time plus module calibration time Time Channel Turn Off Requires up to one module update time Time Reconfiguration Requires up to one module update time plus module calibration time Time Channel Scan 28 Hz 250 ms Time with lead 50 60 Hz 147 ms resistance 800 Hz 18 ms 6400 Hz 10 ms Channel Scan 28 Hz 125 ms Time without lead 50 60 Hz 75 ms resistance 800 Hz 10 ms 6400 Hz 6 ms RTD Excitation RTD setting Curren 0 25 mA Recommended for use with higher resistance ranges for both RTDs and direct resi stance inputs 1000QRTDs and 3000Q resistance input Refer to RTD manufacturer for recommendations mA Recommended to use for all other RTD and direct resistance inputs except 1000Q RTDs and 3000Q resistance input ranges are limited Refer to RTD manufacturer for recommendations
6. 1200 0 2 C 0 2 C 0 003 C C 0 005 C C 618315 0 4 F 0 4 F 0 003 F F 0 005 F F Nickel 672 0 2 C 0 2 C 0 003 C C 0 005 C C 3 0 4 F 0 4 F 0 003 F F 0 005 F F Nickel Iron 0 3 C 0 3 C 0 008 C C 0 008 C C 518 9 0 5 F 0 5 F 0 008 F F 0 008 F F Resistance 5 0 15Q 0 004Q C 0 003Q C 0 002Q F 0 0020 F 5000 0 5Q 0 0 0 0070 F 0 007Q F 10000 1 0Q 1 0Q 0 0250 C 0 0250 C 0 014Q F 0 014Q F 30000 1 5Q 2 0 040Q C 0 040Q C 0 0230 F 0 0230 F 1 The accuracy values assume that the module was calibrated within the specified temperature range of 0 C to 60 C 32 F 2 3 4 5 to 140 F Temperature drift specifications apply to a module that has not been calibrated The digits following the RTD type represent the temperature coefficient of resistance a which is defined as the resistance change per ohm per C For instance Platinum 385 refers to a platinum RTD with a 0 00385 ohms ohm C or simply 0 00385 C Actual value at 0 C is 9 04202 per SAMA standard RC21 4 1966 Actual value at 0 C is 100 3 per DIN standard Publication 1746 IN007C EN P December 2002 22 SLC 500 RTD Resistance Input Module Notes Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 23 Notes Publication 1746 IN007C EN P December 2002 SLC 500 and Micr
7. Installation Instructions ur SLC 500 RTD Resistance Input Module Catalog Number 1746 NR8 Inside page mportant User Information sss 2 For More Informatl n 3 Hazardous Location Considerations 4 Environnements dangereux 4 Hazardous Location Considerations 4 Required Tools and Equipment sse 6 Electrostatic Damage 7 Power Requirements t e tede eee ee 7 odular Chassis Considerations trt snnn sss rrn nnn ene s 8 Fixed Expansion Chassis 000510 88110108 8 Genaral Considerations i cta e c es 8 Module Installation and Removal 1ssssss1111ssnssarntitsssrrstnrnnnnssssennren 9 Terminal Block Wiring and Removal sssssssssiisisssiirssrerrsrrisssrrrssnnnes 10 Wiring Considerations 11 Wiring Resistance Devices Potentiometers to the Module 14 Wiring Input Devices to the NR8 Module 15 Sp cifications 2 s 16 Publication 1746 IN007C EN P December 2 2 SLC 500 RTD Resistance Input Module Important User Information Because of the variety of uses for the products described in this publication those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements including any applicable laws regulations co
8. des and standards The illustrations charts sample programs and layout examples shown in this guide are intended solely for purposes of example Since there are many variables and requirements associated with any particular installation Allen Bradley does not assume responsibility or liability to include intellectual property liability for actual use based upon the examples shown in this publication Allen Bradley publication SGI 1 1 Safety Guidelines for the Application Installation and Maintenance of Solid State Control available from your local Allen Bradley office describes some important differences between solid state equipment and electromechanical devices that should be taken into consideration when applying products such as those described in this publication Reproduction of the contents of this copyrighted publication in whole or in part without written permission of Allen Bradley Company Inc is prohibited Throughout these installation instructions we use notes to make you aware of safety considerations Identifies information about practices or circumstances that ATTENTION can lead to personal injury or death property damage or economic loss Attention statements help you to e identify a hazard e avoid the hazard recognize the consequences IMPORTANT Identifies information that is critical for successful application and understanding of the product Publication 1746 IN007C EN P D
9. dule 2 Wire Interconnection 0 Cable Shield Jumper Frame Ground Return Belden 9501 Shielded Cable 3 Wire Interconnection Cable Shield Frame Ground Return Belden 9533 Shielded Cable or Belden 83503 Shielded Cable 4 Wire Interconnection Cable Shield Frame Ground Sense Return O Leave One Sensor Wire Open Belden 9533 Shielded Cable or Belden 83503 Shielded Cable Publication 1746 IN007C EN P December 2002 9 0 WOOCOOOO OOOOOOOOOOOOOOOO SLC 500 RTD Resistance Input Module 13 IMPORTANT The RTD module requires three wires to compensate for lead resistance error We recommend that you do not use 2 wire RTDs if long cable runs are required as it reduces the accuracy of the system However if a 2 wire configuration is required reduce the effect of the lead wire resistance by using a lower gauge wire for the cable for example use AWG 16 instead of AWG 24 Also use cable that has a lower resistance per foot of wire The module s terminal block accepts one AWG 14 gauge wire To limit overall cable impedance keep input cables as short as possible Locate your I O chassis as near the RTD sensors as your application permits Ground the shield drain wire at one end only The preferred location is at the chassis mounting tab of the chassis under the RTD module Refer to IEEE Std 518 Section 6 4 2 7 or contact your sensor manufactu
10. e cable and apply shrink wrap Then earth ground at the frame ground of the chassis 4 At the other end of the cable cut the drain wire and foil shield back to the cable and apply shrink wrap 5 Connect the signal wires to the 1746 NR8 terminal block and the input 6 Repeat steps 1 through 5 for each channel on the 1746 NR8 module Publication 1746 IN007C EN P December 2002 16 SLC 500 RTD Resistance Input Module Specifications Electrical Specifications Backplane Current Consumption 100 mA at 5V de 55 mA at 24V de Backplane Power Consumption 1 82W maximum 0 5W at 5V de 1 32W at 24V dc External Power Supply Requirements None Number of Channels 8 backplane isolated 1 0 Chassis Location Any 1 0 module slot except slot 0 A D Conversion Method Sigma Delta Modulation Input Filtering Low pass digital filter with programmable notch filter frequencies Common Mode Rejection 28 Hz and 50 60 Hz Filter frequencies gt 120 dB at 50 Hz 28 Hz and 50 Hz filter frequencies gt 120 dB at 60 Hz 28 Hz and 60 Hz filter frequencies Normal Mode Rejection between input and input 65 dB minimum at 50 60 Hz with 50 60 Hz filter 110 dB minimum at 50 Hz with 28 Hz filter 95 dB minimum at 60 Hz with 28 Hz filter Max common mode voltage 1 volt Max allowed permanent overload Volts 5V dc Current 5 mA Input Filter Cut Off Freq
11. ecember 2002 SLC 500 RTD Resistance Input Module 3 For More Information Related Publications For Refer to this Document Pub No A more detailed description on how to install SLC 500 RTD Resistance 746 UM003 and use your RTD Resistance Input Module Input Module User Manual A more detailed description on how to install SLC 500 Modular Hardware 747 UM011 and use your modular SLC 500 system Style Installation and Operation Manual A more detailed description on how to install SLC 500 Fixed Hardware 747 6 21 and use your fixed SLC 500 system Style Installation and Operation Manual A reference manual that contains status file SLC 500 Instruction Set 747 RM001 data instruction set and troubleshooting Reference Manual information How to Get More Information If you would like a manual you can download a free electronic version from the internet at www theautomationbookstore com purchase a printed manual by contacting your local distributor or Rockwell Automation representative visiting www theautomationbookstore com and placing your order calling 1 800 963 9548 USA Canada or 001 330 725 1547 Outside USA Canada Publication 1746 IN007C EN P December 2002 4 SLC 500 RTD Resistance Input Module Hazardous Location Considerations This equipment is suitable for use in Class I Division 2 Groups A B C D or non hazardous locations only The following
12. he RTD module in a 2 slot expansion chassis with another SLC I O or communication module refer to the table in the SLC 500 RTD Resistance Input Module User Manual For a complete listing of valid combinations using the RTD module in a 2 slot expansion chassis with another SLC I O or communication module refer to the table in the SLC 500 RTD Resistance Input Module User Manual publication number 1746 UMO003 General Considerations Most applications require installation in an industrial enclosure to reduce the effects of electrical interference RTD inputs are susceptible to electrical noises due to the small amplitudes of their signal Group your modules to minimize adverse effects from radiated electrical noise and heat Consider the following conditions when selecting a slot for the RTD module Position the module in a slot away from power lines load lines and other sources of electrical noise such as hard contact switches relays and AC motor drives away from modules which generate significant radiated heat such as the 32 point I O modules Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 9 Module Installation and Removal When installing the module in a chassis it is not necessary to remove the terminal block from the module Module Installation Procedure 1 Align the circuit board of the RTD module with the card guides located at the top and bottom of the chassis 2
13. ires that provide input to the RTD module The module supports connections from any combination of up to eight RTDs of various types for example platinum nickel copper or nickel iron or other resistance inputs See the input specifications beginning on page 19 for RTD types their associated temperature ranges and the analog input signal ranges that each 1746 NR8 channel supports Each input channel is individually configurable for a specific input device Broken sensor detection open or short circuit is provided for each input channel In addition the module provides indication if the input signal is out of range The module contains a removable terminal block providing connection for any mix of eight RTD sensors or resistance input devices There are no output channels on the module Module configuration is done via the user program There are no DIP switches Channel Status LEDs Channel status LEDs indicate the status for channels 0 through 7 Related error information is contained in the channel status word This includes conditions such as normal operation channel related configuration errors open circuit errors out of range errors All channel errors are recoverable errors Module Status LED The module status LED shows diagnostic or operating errors related to the module These non recoverable errors may be detected during power up or during operation Once an error has been detected the module no longer commu
14. nicates with the SLC processor Channel states are disabled and data words are cleared 0 Failure of any diagnostic test results in a non recoverable error and requires the assistance of your local distributor or Rockwell Automation Publication 1746 IN007C EN P December 2002 6 SLC 500 RTD Resistance Input Module Channel Status LEDs Green INPUT Door Label CHANNEL STA TUS MODULE RTD resist ince Module Status LED Green 9 8 Removable Terminal 9 Block 2 Q Q 8 Q 8 Return 7 Vo 1746 NR8 Cable Tie Slots Required Tools and Equipment Have the following tools and equipment ready e small blade screwdriver 0 100 inch slot width e RTD module 1746 NR8 RTD sensor or resistance input appropriate cable if needed programming equipment Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 7 Electrostatic Damage Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins or other sensitive areas Guard against electrostatic damage by observing the following precautions Electrostatic discharge can degrade performance or cause ATTENTION permanent damage Handle the module as stated below Wear an approved wrist strap grounding device when handling the module Touch a grounded object to rid yo
15. oLogix are trademarks of Rockwell Automation Belden is a trademark of Belden Inc www rockwellautomation com 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 IN007C EN P December 2002 PN 40071 091 01 3 Supersedes Publication 1746 IN007B EN P May 2000 Copyright 2002 Rockwell Automation All rights reserved Printed in the U S A
16. perature drift when the module has been auto calibrated at the operating temperature and when the module s temperature changes but has not been recalibrated Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 21 RTD Accuracy and Temperature Drift Specifications Input Type Accuracy Accuracy Temperature Drift Temperature Drift 0 25 mA 1 0 mA 0 25 mA Excitation 1 0 mA Excitation Excitation Excitation Platinum 1000 0 5 C 0 7 C 0 012 C C 0 020 C C 385 9 0 9 F 1 3 F 0 012 F F 0 020 F F 200Q 0 6 C 0 7 C 0 015 C C 0 020 C C x1 1 F 1 3 F 0 015 F F 0 020 F F 500Q 0 7 C 0 5 C 0 020 C C 0 012 C C 1 3 F 0 9 F 0 020 F F 0 012 F F 1000Q 60 0 4 C 0 035 C C 0 010 C C 2 2 F 0 7 F 0 035 F F 0 010 F F Platinum 1000 0 4 C 0 6 C 0 010 C C 0 015 C C 3916 0 7 F x1 1 F 0 010 F F 0 015 F F 200Q 0 5 C 0 6 C 0 011 C C 0 015 C C 0 9 F x1 1 F 0 011 F F 0 015 F F 500Q 0 6 C 0 4 C 0 015 C C 0 012 C C x1 1 F 0 7 F 0 015 F F 0 012 F F 10000 0 0 3 C 0 026 C C 0 010 C C 1 6 F 0 6 F 0 026 F F 0 010 F F Copper 10Q 0 5 C 0 8 C 0 008 C C 0 008 C C 42691 0 9 F 1 4 F 0 008 F F 0 008 F F Nickel
17. rer for additional details Route RTD resistance input wiring away from any high voltage I O wiring power lines and load lines Tighten terminal screws using a small flathead screwdriver Each screw should be turned tight enough to immobilize the wire s end Excessive tightening can strip the terminal screw The torque applied to each screw should not exceed 0 25 Nm 2 25 in lb for each terminal Follow system grounding and wiring guidelines found in your SLC 500 Installation and Operation Manual publication 1747 UM011 When using a 3 wire configuration the module compensates for resistance error due to lead wire length For example in a 3 wire configuration the module reads the resistance due to the length of one of the wires and assumes that the resistance of the other wire is equal If the resistances of the individual lead wires are much different an error may exist The closer the resistance values are to each other the greater the amount of error that is eliminated To ensure temperature or resistance value accurac the IMPORTANT P Y resistance difference of the cable lead wires must be equal to or less than 0 01 There are several ways to insure that the lead values match as closely as possible They are as follows Keep lead resistance as small as possible and less than 25Q Use quality cable that has a small tolerance impedance rating Use a heavy gauge lead wire which has less resistance per foo
18. t Publication 1746 IN007C EN P December 2002 14 SLC 500 RTD Resistance Input Module Wiring Resistance Devices Potentiometers to the Module Potentiometer wiring requires the same type of cable as that for the RTD described on page 11 Potentiometers can be connected to the RTD module as a 2 wire interconnection as shown below 2 Wire Potentiometer Interconnection Add Jumper Potentiometer Cable Shield Frame Q Ground Belden 9501 Shielded Cable 0 0000000000 Cable Shield Frame Ground Potentiometer 4 I 1 Belden 9501 Shielded Cable Add Jumper ON 9 8 LS 8 8 8 o7 Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 15 Wiring Input Devices to the NR8 Module See Step 4 2 Conductor Shielded Cable Signal Wire Signal Wire Foil Shield Sigel Wire Drain Wire Signal Wire See step 3 Signal Wire pf See Step 4 3 Conductor Shielded Cable Signal Wire Signal Wire Signal Wire Foil Shield Drain Wire Signal Wire Signal Wire See step 3 To wire your NR8 module follow these steps 1 At each end of the cable strip some casing to expose the individual wires 2 Trim the signal wires to 5 08 cm 2 in lengths Strip about 4 76 mm 3 16 in of insulation away to expose the end of the wire 3 At one end of the cable twist the drain wire and foil shield together bend them away from th
19. uencies 7 80 Hz at 28 Hz filter frequency 13 65 Hz at 50 60 Hz filter frequency 209 6 Hz at 800 Hz filter frequency 1676 Hz at 6400 Hz filter frequency Calibration Module autocalibrates at power up Periodic calibration every 5 minutes can also be enabled Isolation 500V ac for 1 minute between inputs and chassis ground and between inputs and backplane 5V dc continuous between channels 1 Do not apply a voltage or current to the module Publication 1746 IN007C EN P December 2002 SLC 500 RTD Resistance Input Module 17 Physical Specifications LED Indicators 9 green status indicators one for each of 8 channels and one for module status Module ID Code 3508 Class 1 12708 Class 3 Maximum Termination Wire Size One 14 AWG wire per terminal Maximum Cable Impedance 25 ohms maximum impedance for 3 wire RTD configuration see Cable Specifications on page 11 Terminal Block 1746 RT 35 Environmental Specifications 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 Agency Certification UL and C UL approved Hazardous 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 Publication 1746 IN
20. urself of electrostatic charge before handling the module Handle the module from the front away from the backplane connector Do not touch backplane connector pins Keep the module in its static shield bag when not in use or during shipment Power Requirements The RTD module receives its power through the SLC 500 chassis backplane from the fixed or modular 5V dc 24V dc chassis power supply The maximum current drawn by the module is shown in the table below 5V dc Amps 24V dc Amps When you are using a modular system configuration add the values shown in the table above to the requirements of all other modules in the SLC chassis to prevent overloading the chassis power supply When you are using a fixed system controller refer to the important note on page 8 about module compatibility in a 2 slot fixed expansion chassis Publication 1746 IN007C EN P December 2002 8 SLC 500 RTD Resistance Input Module Modular Chassis Considerations Place your RTD module in any slot of an SLC 500 modular chassis except slot 0 or a modular expansion chassis Slot 0 is reserved for the modular processor or adapter module Fixed Expansion Chassis Considerations IMPORTANT The 2 slot SLC 500 fixed I O expansion chassis 1746 A2 supports many combinations of modules The combinations that are not supported by the fixed expansion chassis are shown in the table below For a complete listing of valid combinations using t
21. use the write on label located on the side of the terminal block to identify the module location and type To remove the terminal block 1 Loosen the two terminal block release screws 2 Grasp the terminal block at the top and bottom and pull outward and down Wiring Considerations Follow the guidelines below when planning your system wiring Since the operating principle of the RTD module is based on the measurement of resistance take special care in selecting your input cable For 2 wire or 3 wire configuration select a cable that has a consistent impedance throughout its entire length Configuration Recommended Cable 2 wire Belden 9501 or equivalent 3 wire Belden 9533 or equivalent less than 30 48 m 100 ft 3 wire Belden 83503 or equivalent greater than 30 48 m 100 ft or high humidity conditions For a 3 wire configuration the module can compensate for a maximum cable length associated with an overall cable impedance of 25 ohms As shown in the figure on the next page three configurations of RTDs can be connected to the RTD module e 2 wire RTD which is composed of 2 RTD lead wires RTD and Return e 3 wire RTD which is composed of a Sense and 2 RTD lead wires RTD and Return 4 wire RTD which is composed of 2 Sense and 2 RTD lead wires RTD and Return The second sense wire of a 4 wire RTD is left open Publication 1746 IN007C EN P December 2002 12 SLC 500 RTD Resistance Input Mo
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