Installation and Operation Guide
Contents
1. the I O Status Word which is reported to the PLC CPU CTI strongly recommends the user application monitor the I O Module Status Words which are Status Words 11 26 and apply to SIMATIC Controllers 545 555 560 amp 565 and the 575 The I O Module Status Word can be used to report a module failure for an I O Module in any of the 505 I O slots Please refer to Siemens SIMATIC 505 Programming Reference Manual for more information If a module failure is reported by the status word the module should be replaced with a working unit and the failed module sent infor repair 12 CTI 2552 A Installation and Operation Guide CHAPTER 3 TROUBLESHOOTING If the module provides improper readings or the status indicator is not on use the following chart to determine the appropriate corrective action SYMPTOM PROBABLE CAUSE CORRECTIVE ACTION Indicator is not lit Base or PC power is off Turn base or PC on Module not seated Reseat module in 505 rack Incorrect inputs Wrong addresses for word Check program for correct input word input addresses Not logged in Read 1 0 configuration Incorrectly calibrated Return the module to CTI for calibration All negative Blown Fuse Return the module to CTI temperatures for service Figure 13 Troubleshooting Matrix When it is inconvenient to visually check the status indicator use the TISOFT Display Failed I O or Show PLC Diagnostics support functions CAUTION The module fus2. 2552 A 8 Channel RTD Input Module iii Figure 2 Word Input to the PLC from the Module 2 Figure 3 Example Change Input Level 2 Figure 4 Effect of Voltage Input 100 Ohm Platinum 3 Figure 5 Effect of Voltage Input Millivolts 3 Figure 6 Jnput Resolution sedere dx scene Ie ea beans RE MEC ek bana E EC eps 4 Figure 7 Factory Configuration Jumper Settings 7 Figure 8 Configuration Jumper Locations 8 Figure 9 Copper Wire Table at 25 Degrees Celsius 9 Figure 10 Screw Terminal Block Wiring 10 Figure 11 Wiring Diagram for 2 3 or4WireRTD 11 Figure 12 Wiring Diagram for Millivolt Measurements 12 Figure 13 Example I O Configuration Chart 13 Figure 14 Troubleshooting Matrix 15 Figure 15 Factory Configuration Jumper Settings 19 CTI 2552 A Installation and Operation Guide vii viji CTI 2552 A Installation and Operation Guide USAGE CONVENTIONS NOTE Notes alert the user to special features or proc
3. 7 0 00258 2 58 16 13 50 0 01350 0 00411 4 11 18 21 40 0 02140 0 00652 6 52 20 34 10 0 03410 0 01039 10 39 22 54 20 0 05420 0 01652 16 52 24 86 10 0 08610 0 02624 26 24 26 137 00 0 13700 0 04176 41 76 28 218 00 0 21800 0 06645 66 45 30 356 00 0 35600 0 10851 108 51 Copper Wire Table at 25 Degrees Celsius 8 CTI 2552 A Installation and Operation Guide To assign an input to a specific channel locate the appropriate channel position on the screw terminal block as shown in the following figure DO CHANNEL 1 Ay OO J CHANNEL 2 O za ANoahwh Q9 000009 CHANNEL 3 N D CHANNEL 4 ND WOW oo V CHANNEL 5 Ko m N ma OOO CHANNEL 6 VOW N o V OOO CHANNEL 7 N 9 CHANNEL 8 wo o QOO Ne Figure 9 Screw Terminal Block Wiring CTI 2552 A Installation and Operation Guide 9 2 WIRE RTD TYPICAL CHANNEL 4 WIRE 1 e RTD e 3 A 4 TYPICAL CHANNEL 3 WIRE 1 A 2 RTD 3 e 4 TYPICAL CHANNEL Figure 10 Wiring Diagram for 2 3 or 4 Wire RTD CAUTION RTD wires must be of the same gauge 10 CTI 2552 A Installation and Operation Guide CAUTION For proper operation ensure that the 2552 A is not subjected to large temperature gradien
4. CTI 2552 A 8 CHANNEL ISOLATED RTD INPUT MODULE INSTALLATION AND OPERATION GUIDE Ver 1 2 CTI Part 062 00306 012 PLU TILL 2552 AIOG 020106 25 Copyright O 2006 Control Technology Inc All rights reserved This manual is published by Control Technology Inc 5734 Middlebrook Pike Knoxville TN 37921 This manual contains references to brand and product names which are tradenames trademarks and or registered trademarks of Control Technology Inc Siemens and SIMATIC are registered trademarks of Siemens AG Other references to brand and product names are tradenames trademarks and or registered trademarks of their respective holders DOCUMENT DISCLAIMER STATEMENT Every effort has been made to ensure the accuracy of this document however errors do occasionally occur CTI provides this document on an as is basis and assumes no responsibility for direct or consequential damages resulting from the use of this document This document is provided without express or implied warranty of any kind including but not limited to the warranties of merchantability or fitness for a particular purpose This document and the products it references are subject to change without notice If you have a comment or discover an error please call us toll free at 1 800 537 8398 ji CTI 2552 A Installation and Operation Guide PREFACE This Installation and Operation Guide provides installation and operation instructions for the CTI 2552 A Eight C
5. E 4 WIRE RTD POSITION SWITCH POSITION RTD TEMP MILLIVOLT NUMBER COMPENSATION VS TYPE SWITCHES SWITCHES JUMPER CHANNEL SW1 SW2 SW1 amp SW2 1 2 OPEN CLOSED OPEN CLOSED 1 JP2 3WIRE 4 WIRE 1 120 OHM 100OHM Millivolts Temp 2 JP4 3WIRE 4 WIRE 2 120 OHM 100OHM Millivolts Temp 3 JP6 3WIRE 4 WIRE 3 120 OHM 100OHM Milivolts Temp 4 JP8 3WIRE 4 WIRE 4 120 OHM 100OHM Millivolts Temp 5 JP10 3WIRE 4 WIRE 5 120 OHM 100 OHM Millivolts Temp 6 JP12 3 WIRE 4 WIRE 6 120 OHM 100OHM Millivolts Temp 7 JP14 3WIRE 4 WIRE 7 120 OHM 100OHM Milivolts Temp 8 JP16 3WIRE 4 WIRE 8 120 OHM 100OHM Millivolts Temp DIGITAL FAHRENHEIT ALL FILTERING JUMPER CENTIGRADE CHANNELS SELECT JP28 JP29 18 Filtering Disabled Degrees F Filtering Enabled Degrees C CTI 2552 A Installation and Operation Guide 17 USER NOTES CTI 2552 A Installation and Operation Guide LIMITED PRODUCT WARRANTY CTI warrants that this CTI Industrial Product shall be free from defects in material and workmanship for a period of one 1 year after purchase from CTI or from an authorized CTI Industrial Distributor This CTI Industrial Product will be newly manufactured from new and or serviceable used parts which are equal to new in the Product Should this CTI Industrial Product fail to be free from defects in material and workmanship at any time during this one 1 year warranty period CTI will repair or replace at its option parts or Products f
6. HAPTER 2 INSTALLATION porco rium tnort Bof quedo t Ea Rh cs ca pua 5 2 1 Planning the Installation 5 2 2 Calculating the I O Base Power Budget 5 2 3 Unpacking the Module oer dae aa EO 5 2 4 Configuring the Module 6 2 4 1 Select Temperature or Millivolt Input 6 2 4 2 Selecting 3 Wire or 4 Wire Operation 6 2 4 3 Selecting 100 Ohm or 120 Ohm RTD Inputs 6 2 4 4 Selecting Digital Filtering 7 2 4 5 Select Degrees Celsius or Fahrenheit 7 2 5 Inserting the Module Into the I O Base 8 2 6 Wiring the Input Connectors 9 2 7 Checking Module Operation 13 CHAPTER 3 TROUBLESHOOTING 15 SPECIFICATIONS S Voie craps AA helene ae ea take AA Ia a GS 17 JUMPER SETTINGS LOG SHEET 19 LIMITED PRODUCT WARRANTY wwa wai wa tenet n 21 REPAIR POLICY eian Qua cna stg ts lar ones Ra kon ai tun ee areca baton ak ec oe ween anton 23 CTI 2552 A Installation and Operation Guide v CTI 2552 A Installation and Operation Guide TABLE OF FIGURES Figure 1 The
7. ING NOT TO SCALE Figure 8 Jumper Locations 2 5 Inserting the Module Into the I O Base Insert the module into the I O base by carefully pushing the module into the slot When the module is fully seated in the slot tighten the captive screws at the top and bottom to hold the module in place To remove the module from the I O base loosen the captive screws then remove the module from the I O base Be careful not to damage the connector card at the back of the module when inserting or removing the module CTI 2552 A Installation and Operation Guide 2 6 Wiring the Input Connectors RTD input signals are accepted through a screw terminal connector block located on the front of the module Consult the RTD manufacturer s recommendations for selecting the input wire type and size The Model 2552 A uses a fixed connector to terminate field wiring This is used because the chemistry of a removable connector may have an adverse effect on the accuracy of the measurement CTI has carefully selected a connector that minimizes this effect Refer to Figure 10 for correct wiring for 2 3 or 4 wire RTDs to the Model 2552 A Each channel group consists of four screw terminals See Figure 10 The Model 2552 A may compensate for up to 20 Ohm of lead resistance per wire Use the table below in planning the maximum distance the RTD may be located from the module AWG Ohms Km Ohms Meter Ohms Ft Ohms 1000Ft 12 5 33 0 00533 0 00162 1 62 14 8 47 0 0084
8. TY ON CTI PRODUCTS INCLUDING WITHOUT LIMITATION ANY WARRANTY OF MERCHANTABILITY OR OF FITNESS FOR A PARTICULAR PURPOSE AND IS IN LIEU OF ALL OBLIGATIONS OR LIABILITY OF CTI FOR DAMAGES IN CONNECTION WITH LOSS DELIVERY USE OR PERFORMANCE OF CTI PRODUCTS OR INTERRUPTION OF BUSINESS LOSS OF USE REVENUE OR PROFIT IN NO EVENT WILL CTI BE LIABLE FOR SPECIAL INCIDENTAL OR CONSEQUENTIAL DAMAGES SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR CONSUMER PRODUCTS SO THE ABOVE LIMITATIONS OR EXCLUSIONS MAY NOT APPLY TO YOU THIS WARRANTY GIVES YOU SPECIFIC LEGAL RIGHTS AND YOU MAY ALSO HAVE OTHER RIGHTS WHICH MAY VARY FROM STATE TO STATE CTI 2552 A Installation and Operation Guide 19 20 CTI 2552 A Installation and Operation Guide REPAIR POLICY In the event that the Product should fail during or after the warranty period a Return Material Authorization number RMA can be reguested verbally or in writing from CTI main offices Whether this eguipment is in or out of warranty a Purchase Order number provided to CTI when requesting the RMA number will aid in expediting the repair process The RMA number that is issued and your Purchase Order number should be referenced on the returning equipment s shipping documentation Additionally if under warranty proof of purchase date and serial number must accompany the returned equipment The current repair and or exchange rates can be obtained by con
9. digital filtering enabled 15 Input Protection Input Bandwidth Filtering Time Constant 100 mV input step Update Time Open RTD Reporting Bias Current to RTD Probe Wire Resistance Compensation Module Power from Base Isolation Field Wiring Connector Mechanical Operating Temperature Storage Temperature Humidity Agency Approvals 20 000 Volts ESD 20 VDC from any input to channel common 20 VDC from any input to any other input on same channel channels are isolated from each other by 1500 VDC 5 5 Hz digital filtering disabled 0 16 Hz digital filtering enabled 18 mS digital filtering disabled 1 0 Sec digital filtering enabled 15 milliseconds for all eight channels To PLC as bit number one set 250 microamp nominal Up to 20 Ohms per lead wire 2 8 watts S VDC 1500 VDC channel to channel and channel to PLC Accepts 18 26 AWG Size single wide 505 Module 0 to 60 degrees Celsius 32 to 140 degrees Fahrenheit 40 to 85 degrees Celsius 40 to 185 degrees Fahrenheit 0 to 95 noncondensing UL UL Canada FM Class I Div 2 CE Specifications subject to change without notice 16 CTI 2552 A Installation and Operation Guide JUMPER SETTINGS LOG SHEET Record the configuration jumper settings on this log for future reference Make additional copies if necessary CHANNEL 3WIR
10. e is not user serviceable If this fuse is blown the module has a serious component failure and should be returned to CTI for repair If after consulting the chart above you are unable to diagnose or solve the problem contact your local distributor or CTI at 1 800 537 8398 for further assistance CTI 2552 A Installation and Operation Guide 13 14 CTI 2552 A Installation and Operation Guide Channels per Module Size Standard RTD Types 100 Ohm platinum 120 Ohm nickel Absolute Temp Accuracy Millivolt Range Millivolt Input impedance Absolute Millivolt Accuracy Repeatability Resolution Common Mode Rejection Normal Mode Rejection CTI 2552 A Installation and Operation Guide SPECIFICATIONS 8 eight Single Wide 505 Module TCR 0 003850 Ohm Ohm deg C European DIN 43760 198 to 849 8 degrees Celsius 327 6 to 1561 6 degrees Fahrenheit TCR 0 00672 Ohm Ohm deg C 79 8 to 260 0 degrees Celsius 111 6 to 500 0 degrees Fahrenheit 0 4 degrees Celsius at calibrated temperature 25 C 0 8 degrees Fahrenheit over operating range 0 to 60 C worst case 0 to 103 04 Millivolts Greater than 10 KOhm 60Hz Greater than 1000 MegOhm DC 0 5 percent full scale or 500 uV 05 Full Scale temp or mV 025 Full Scale temp or mV Greater than 110 dB 60Hz digital filtering disabled Greater than 160 dB 60Hz digital filtering enabled Greater than 45 dB 60Hz
11. edures CAUTION Cautions alert the user to procedures which could damage eguipment WARNING Warnings alert the user to procedures which could damage eguipment and endanger the user CTI 2552 A Installation and Operation Guide ix CTI 2552 A Installation and Operation Guide CHAPTER 1 DESCRIPTION The 2552 A Eight Channel RTD Input Module is a member of Control Technology s family of I O modules compatible with the SIMATIC 505 series programmable controllers The Model 2552 A is designed to translate 100 Ohm platinum RTDs 120 Ohm nickel RTDs or millivolt input signals into equivalent digital words which are then sent to the programmable controller PLC The 2552 A RTD Input Module features built in independent two three or four lead compensation for each RTD input Support for other RTD types is available through special request from the factory Call CTI at 1 800 537 8398 to determine if support is available for your special RTD type 1 1 Asynchronous Operation The module operates asynchronously with respect to the PLC a scan of the PLC and input sampling of the module do not occur at the same time Instead the module will translate all inputs in one module update 15 milliseconds maximum and store the translated words in a buffer memory The PLC retrieves the stored words from the module buffer memory at the start of the I O scan 1 1 1 Compatibility with Immediate I O The Model 2552 A has been tested and is compatible w
12. hannel Isolated RTD Input Module for SIMATIC 505 programmable controllers We assume you are familiar with the operation of SIMATIC 505 series programmable controllers Refer to the appropriate SIMATIC user documentation for specific information on the SIMATIC 505 programmable controllers and I O modules This Installation and Operation Guide is organized as follows Chapter 1 provides a description of the module Chapter 2 covers installation and wiring Chapter 3 is a guide to troubleshooting WI ISOLATED RTD INPUT ACTIVE Gud EEHREEEREREEEE FENNE LII CTI 2552 A Installation and Operation Guide iii CTI 2552 A Installation and Operation Guide TABLE OF CONTENTS PREEA CE ia ii Aa ipi td ert cate aa iji TABDEOQEPEIGURES 5 3 235 59 5 c ORIS ow eem os wa aa ERA GR ENO vii USAGE CONVENTIONS 5341124 Ea Rue Lodi A R0 Md ROD DURER Oa As d de ix CHAPTER DESCRIPTION 122 soot pen edo dace ides haod a s ode AA abr 1 1 1 Asynchronous Operation sses poa ie cette a E ES 1 1 1 1 Compatibility with Immediate I O 1 1 2 100 Ohm or 120 Ohm RTDs 1 1 3 Digital Word Map 52 4 thaw tin Saad KAIKA KA ious d pee es 2 1 4 RTD Input to Digital Conversion 2 1 5 Effect of Out of Range Input Signals 3 1 6 Resol tion 755r LUE Ek SUM EAR Oe hea Gata ale a oes dae es 4 C
13. he module is configured in the memory of the PLC This is important because the module will appear to be functioning regardless of whether it is communicating with the PLC To view the PLC memory configuration chart listing all slots on the base and the inputs or outputs associated with each slot refer to your SIMATIC or TISOFT Programming Manual An example chart is shown in the following figure I O MODULE DEFINITION FOR CHANNEL 1 BASE 00 VO SPECIAL SLOT ADDRESS X Y WX WY FUNCTION 01 0001 00 00 08 00 NO 02 0002 00 00 00 00 NO 15 0000 00 00 00 00 NO 16 0000 00 00 00 00 NO Figure 12 Example I O Configuration Chart In this example the 2552 A Module is inserted in slot 1 in I O base 0 Data for channel 1 appears in word location WX1 data for channel 2 appears in word location WX2 etc For your particular module look in the chart for the number corresponding to the slot occupied by the module If word memory locations appear on this line then the module is registered in the PLC memory and the module is ready for operation If the line is blank or erroneous re check the module to ensure that it is firmly seated in the slots Generate the PLC memory configuration chart again If the line is still incorrect contact your local distributor or CTI at 1 800 537 8398 for further assistance NOTE In the event a CTI analog detects an onboard module failure the module will assert the module fail line and report the module failure in
14. hm nickel RTDs 2 3 or 4 wire or millivolt range and digital filtering no filtering mode before wiring the input connectors and inserting the module into the I O base Changing the module input channel configuration involves the following steps NOTE FACTORY SHIPPING CONFIGURATION As shipped all input channels are configured 100 Ohm platinum 3 wire RTDs degrees Celsius and digital filtering enabled for temperature measurements 1 Selecting temperature or millivolt measurement 2 Selecting 3 or 4 wire compensation 3 Selecting 100 Ohm platinum or 120 Ohm nickel RTD input mode for each channel 4 Selecting digital filtering or no filtering for the module 5 Logging the configuration jumper settings for future reference Each of these steps is described in the following sections 2 4 1 Select Temperature or Millivolt Input Locate DIP switch SW2 Temperature Millivolt Switches in Figure 8 on the 2552 A card and for each input 1 8 select either Temperature or Millivolt by turning each switch open or closed The CLOSED position corresponds to Temperature 2 4 2 Selecting 3 Wire or 4 Wire Operation Locate the 8 3 wire 4 wire jumpers corresponding to input channels 1 through 8 These jumpers are located adjacent to the input terminal strip see Figure 8 For each input channel select 3 wire mode by placing the jumper in the 3 wire position or 4 wire mode by placing the jumper in the 4 wire position If 2 wire operation is des
15. illustrates the effects of a change in input level going from 0 degrees to 102 4 degrees in the RTD Input Mode MSB LSB _ Digital Word WX T 10 0 0 32 16 8 4 2 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Digital Word WX 40242 05 0 00 oi 0 0000 00 ojo 0 10 P 82 16 8 4 2 1 1024 Figure 3 Example Change Input Level 2 CTI 2552 A Installation and Operation Guide 1 5 Effect of Out of Range Input Signals RTD inputs exceeding 849 8 degrees C for 100 Ohm platinum or 260 0 degrees C for 120 Ohm nickel will cause the overrange bit to be set A maximum temperature of 849 9 degrees C for 100 Ohm platinum or 260 1 degrees C for 120 Ohm nickel will be returned for any positive overrange input Similarly an input below 199 8 degrees C for 100 Ohm platinum or 79 8 degrees C for 120 Ohm nickel will cause the overrange bit to be set A minimum temperature of 199 9 degrees C for 100 Ohm platinum or 79 9 degrees C for 120 Ohm nickel will be returned for any negative underrange input 20V 199 8 C 849 9 C 20V Module not Underrange Accuracy Overrange Module not protected output data within bit set protected damage specification damage might occur might occur 1998 8498 Figure 4 Effect of Voltage Input 100 Ohm Platinum Millivolt inputs exceeding 103 04 millivolts will cause the over
16. ired use the 4 wire position 2 4 3 Selecting 100 Ohm or 120 Ohm RTD Inputs Locate DIP switch SW1 RTD Type Switches in Figure 8 on the 2552 A circuit card and select either 100 or 120 type RTD for each of the eight inputs by turning each switch open or closed The CLOSED position corresponds to 100 Ohm platinum RTD input 6 CTI 2552 A Installation and Operation Guide 2 4 4 Selecting Digital Filtering Locate the Digital Filtering Jumper JP3 see Figures 8 To enable digital filtering set the jumper in the ENABLED position Since many analog input signals contain noise CTI recommends using digital filtering unless maximum response time is required 2 4 5 Select Degrees Celsius or Fahrenheit Locate the temperature scaling jumper JP4 on the right hand side of the module see Figure 8 and select either degrees Fahrenheit or Celsius by positioning the jumper in the DEG F or DEG C position 3 WIRE POSITION SHOWN oo0oO000000000000000000000000000000 ls 3 WIRE 4 WIRE JUMPERS i m i POSITION 1 3 WIRE 3333535353 4 v POSITION 2 4 WIRE gt gt 2 s s E H TEMP SCALE DEGC c U N E DISABLED DIGITAL tNagLEp FILTERING CLOSED Temperature CLOSED 100 OHM 12345678 12345678 7 o SA SM TEMPERATURE a OPEN Millivolts OPEN 120 OHM T 100 OHM 120 OHM TYPE SWITCHES MILLIVOLT SWITCHES NOTE DRAW
17. ith the Immediate read function of the SIMATIC 545 and 555 PLC 1 2 100 Ohm or 120 Ohm RTDs Each of the module s eight channels may be configured to receive either a 100 Ohm platinum RTD or a 120 Ohm nickel RTD input signal two three or four wire or a DC voltage signal ranging from 0 to 100 millivolts Selection of 100 Ohm or 120 Ohm RTDs or millivolts are made via internal switch and jumper settings see sections 2 4 1 and 2 4 5 CTI 2552 A Installation and Operation Guide 1 1 3 Digital Word Map RTD and or millivolt signals are translated into a 14 bit digital word Since the PLC reguires a 16 bit input word the 14 bit value from the converter is placed into a 16 bit word for transmittal to the PLC As shown in the following figure of the two bits not used for the digital word one is used to show the sign of the word while the other is used to note values which are overrange 32 16 8 4 2 1 BIT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 MSB TRANSLATED LSB SIGN 1 DIGITAL WORD IF OVERRANGE O SET to 1 WORD MAP Figure 2 Word Input to the PLC from the Module 1 4 RTD Input to Digital Conversion The following equations may be used to calculate the digital word in decimal format which will result from a particular RTD input RTD Mode Digital Word WX Degrees X 10 Millivolt Mode Digital Word WX Millivolts X 100 As an example the following figure
18. ound to be defective and shipped prepaid by the customer to a designated CTI service location along with proof of purchase date and associated serial number Repair parts and replacement Product furnished under this warranty will be on an exchange basis and will be either reconditioned or new All exchanged parts or Products become the property of CTI Should any Product or part returned to CTI hereunder be found by CTI to be without defect CTI will return such Product or part to the customer This warranty does not include repair of damage to a part or the Product resulting from failure to provide a suitable environment as specified in applicable Product specifications or damage caused by an accident disaster acts of God neglect abuse misuse transportation alterations attachments accessories supplies non CTI parts non CTI repairs or activities or to any damage whose proximate cause was utilities or utility like services or faulty installation or maintenance done by someone other than CTI Control Technology Inc reserves the right to make changes to the Product in order to improve reliability function or design in the pursuit of providing the best possible Product CTI assumes no responsibility for indirect or consequential damages resulting from the use or application of this equipment THE WARRANTY SET FORTH ABOVE IN THIS ARTICLE IS THE ONLY WARRANTY CTI GRANTS AND IT IS IN LIEU OF ANY OTHER IMPLIED OR EXPRESSED GUARANTY OR WARRAN
19. range bit to be set A reading of 103 05 millivolts will be returned for any positive overrange input Similarly a millivolt input below 0 millivolts will cause the overrange bit to be set A reading of 1 millivolt will be returned for any negative underrange input 20V 0 Millivolts 103 04 Millivolts 20V d Module not Underrange Accuracy Overrange Module not protected output data within bit set protected damage specification damage might occur might occur 0 10304 Figure 5 Effect of Voltage Input Millivolts CTI 2552 A Installation and Operation Guide 3 1 6 Resolution The module has a resolution of approximately 0 2 degrees C 0 4 degrees F or exactly 0 02 millivolts The chart below shows the corresponding input resolution per step for each of the input configuration modes UNITS DIGITAL COUNTS STEP INPUT RESOLUTION PER STEP Temp Degrees C 2 0 2C Temp Degrees F 2 0 4F Millivolts 2 0 02 Millivolts Figure 6 nput Resolution 4 CTI 2552 A Installation and Operation Guide CHAPTER 2 INSTALLATION The installation of the 2552 A Eight Channel RTD Input Module involves the following steps Planning the installation Configuring the module Inserting the module into the I O base Wiring the module input connector Checking module operation aABWN Re The steps listed above are explained in detail in the following pages 2 1 Planning the Installation Planning is the first step in the installa
20. tacting CTI s main office at 1 800 537 8398 When returning any module to CTI follow proper static control precautions Keep the module away from polyethylene products polystyrene products and all other static producing materials Packing the module in its original conductive bag is the preferred way to control static problems during shipment Failure to observe static control precautions may void the warranty For additional information on static control precautions contact CTI s main office at 1 800 537 8398 CTI 2552 A Installation and Operation Guide 21
21. tion of the module This involves calculating the I O base power budget and routing the input signal wiring to minimize noise The following sections discuss these important considerations 2 2 Calculating the I O Base Power Budget The Model 2552 A requires 2 8 watts of 5 V power from the I O base Use this figure to verify that the base power supply capacity is not exceeded 2 3 Unpacking the Module Open the shipping carton and remove the special anti static bag which contains the module CAUTION HANDLING STATIC SENSITIVE DEVICES The components on the 2552 A module printed circuit card can be damaged by static electricity discharge To prevent this damage the module is shipped in a special anti static bag Take the following precautions before removing the module from the bag when opening the module and when handling the printed circuit card during configuration Discharge any static potential by holding the module in its anti static bag and touch the metal chassis of the PLC During the configuration step hold the printed circuit card only by its edges Do not touch the circuit card pin connectors or solder connections After discharging any static build up remove the module from the static bag Do not discard the CTI 2552 A Installation and Operation Guide 5 static bag You will need it for the following configuration procedure 2 4 Configuring the Module The Model 2552 A must be configured for 100 Ohm platinum or 120 O
22. ts during operation Da e FP 3 0 100 mV e a Figure 11 Wiring Diagram for Millivolt Measurements NOTE If a separate shield is used for RTD or Millivolt measurements it should be terminated at screw position 2 of each channel group The shielding for the cable should always be terminated at the Model 2552 A Each isolated input channel contains its own local ground for the shield wire The input isolation amplifier is designed in this manner by the manufacturer Standard practices usually require that all shields be tied together and grounded at a single point In an isolated system this will actually impede the system to reject noise The correct method for terminating the shields on an isolated channel is to connect them to the channel s local ground This will provide the best performance There should never be any shield termination at the source end of the signal wire CTI 2552 A Installation and Operation Guide 11 2 7 Checking Module Operation First turn on the base supply power If the module diagnostics detect no problems the status indicator on the front of the module will light If the status indicator does not light or goes out during operation the module has detected a failure For information on viewing failed module status refer to your SIMATIC TISOFT user manual To diagnose and correct a module failure refer to the next section on troubleshooting You must also check that t
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