Control Technologies CTI 2451 Operating instructions

CTI 2451 EIGHT CHANNEL
THERMOCOUPLE INPUT MODULE
INSTALLATION AND OPERATION GUIDE
Version 1.2
CTI Part #062-00111
2451IOG 051403 $25

ii CTI 2451 Installation and Operation Guide
Copyright © 2003 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 merchantiblility 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.

CTI 2451 Installation and Operation Guide iii
Figure 1 The Model 2451 Thermocouple Input Module
PREFACE
This Installation and Operation Guide provides installation and operation instructions for the CTI 2451
Eight Channel Thermocouple Input Module for SIMATIC® 405 programmable controllers. We assume
you are familiar with the operation of SIMATIC® 405 Series programmable controllers. Refer to the
appropriate SIMATIC® user documentation for specific information on the SIMATIC® 405
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.

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CTI 2451 Installation and Operation Guide v
NOTE:
Notes alert the user to special features or procedures.
CAUTION:
Cautions alert the user to procedures which could damage equipment.
WARNING:
Warnings alert the user to procedures which could damage equipment and endanger the user.
USAGE CONVENTIONS

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CTI 2451 Installation and Operation Guide vii
TABLE OF CONTENTS
PREFACE ..........................................................................iii
USAGE CONVENTIONS ............................................................ v
TABLE OF FIGURES ................................................................ ix
CHAPTER 1. DESCRIPTION ......................................................... 1
1.1 Asynchronous Operation .................................................... 1
1.1.1 Active Channels .................................................. 1
1.2 Type "J" or Type "K" Thermocouple .......................................... 2
1.3 Digital Word Map ......................................................... 2
1.4 Thermocouple Input to Digital Conversion ...................................... 3
1.5 Effect of Out-of Range Input Signals .......................................... 3
1.6 Resolution ............................................................... 4
CHAPTER 2. INSTALLATION ....................................................... 5
2.1 Planning the Installation .................................................... 5
2.2 Calculating the I/O Base Power Budget ........................................ 5
2.3 Unpacking the Module ..................................................... 5
2.4 Configuring the Module ..................................................... 6
2.4.1 Select Millivolt or Temperature Input .................................. 7
2.4.2 Selecting Type "J" or Type "K" Thermocouple Inputs ..................... 7
2.4.3 Selecting Digital Filtering ........................................... 7
2.4.4 Select Degrees Fahrenheit or Celsius .................................. 8
2.5 Inserting the Module into the I/O Base ......................................... 8
2.6 Wiring the Input Connectors ................................................. 8
2.6.1 Wiring Guidelines ................................................. 9
2.6.2 Wiring Examples .................................................. 10
2.7 I/O Configuration and Input Format ........................................... 12
2.7.1 Octal Numbering .................................................. 12
2.7.2 Input Format ..................................................... 12
2.7.3 Operating the Module .............................................. 13
2.8 Decoding Channels ........................................................ 14
2.9 Checking Module Operation ................................................. 15
CHAPTER 3. TROUBLESHOOTING .................................................. 17
SPECIFICATIONS .................................................................. 19
LIMITED PRODUCT WARRANTY ................................................... 23
REPAIR POLICY ................................................................... 25

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CTI 2451 Installation and Operation Guide ix
TABLE OF FIGURES
Figure 1 The Model 2451 Thermocouple Input Module ......................................iii
Figure 2 Active Channels ............................................................. 1
Figure 3 Word Map ................................................................. 2
Figure 4 Example Change in Input Level ................................................ 3
Figure 5 Effect of Temperature Input on Module Performance ............................... 3
Figure 6 Effect of Voltage Input on Module Performance ................................... 4
Figure 7 Input Resolution ............................................................ 4
Figure 8 Jumper Locations ........................................................... 6
Figure 9 Factory Configuration Jumper Settings .......................................... 7
Figure 10 Screw Terminal Block Wiring ................................................. 8
Figure 11 Thermocouple Wiring Example ................................................ 10
Figure 12 Millivolt Wiring Example .................................................... 11
Figure 13 Unused Bits ............................................................... 12
Figure 14 Active Channel Bits ......................................................... 12
Figure 15 Data Word ................................................................ 13
Figure 16 Example Measurement ...................................................... 13
Figure 17 Ladder Diagram Example .................................................... 14

xCTI 2451 Installation and Operation Guide