Rockwell Automation 1771-IFMS User manual

User Manual
(Catalog Numbers 1771-IFMS )
Intrinsically Safe Fast Millivolt
Input Module

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.rockwellautomation.com/literature/) 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.
Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc., is
prohibited.
Throughout this manual, when necessary, we use notes to make you aware of safety considerations.
Allen-Bradley, Rockwell Automation, and TechConnect are trademarks of Rockwell Automation, Inc.
Trademarks not belonging to Rockwell Automation are property of their respective companies.
WARNING 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 identify a hazard, avoid a hazard, and recognize the consequence
SHOCK HAZARD
Labels may be on or inside the equipment, for example, a drive or motor, to alert people that dangerous voltage may be present.
BURN HAZARD Labels may be on or inside the equipment, for example, a drive or motor, to alert people that surfaces may reach dangerous
temperatures.

iPublication 1771-6.5.119
Table of Contents
Preface
About this Manual
Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1
What This Manual Contains . . . . . . . . . . . . . . . . . . . . . . . . P-1
Conventions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-2
Chapter 1
Overview of the Intrinsically Safe
Fast Millivolt Input Module
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Module Description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
How Analog Modules Communicate with
Programmable Controllers . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Accuracy. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Getting Started . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Installing Your Module. . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Extended Input Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Chapter 2
Install the Module
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Before You Install the Module . . . . . . . . . . . . . . . . . . . . . . 2-1
Module Location in the 1771 Chassis . . . . . . . . . . . . . . . . . 2-4
Key the Backplane Connector . . . . . . . . . . . . . . . . . . . . . . 2-5
Install the Module and Wiring Arm . . . . . . . . . . . . . . . . . . 2-5
Wire the Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
Ground the Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Chassis Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8
Single-point Grounding . . . . . . . . . . . . . . . . . . . . . . . . 2-9
Status Indicator Behavior. . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10
Chapter 3
Module Programming
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
Block Transfer Programming . . . . . . . . . . . . . . . . . . . . . . . 3-1
PLC-5 Program Example. . . . . . . . . . . . . . . . . . . . . . . . 3-2
PLC-3 Program Example. . . . . . . . . . . . . . . . . . . . . . . . 3-3
PLC-2 Program Example. . . . . . . . . . . . . . . . . . . . . . . . 3-4
Extended Input Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4
Module Scan Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5

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Chapter 4
Module Configuration
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Configuring Your Input Module. . . . . . . . . . . . . . . . . . . . . 4-1
Input Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Digital Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Real Time Sampling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Scaling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Implementing the Scaling Feature. . . . . . . . . . . . . . . . . 4-4
Scaling Ranges. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Fast Millivolt Input Module Default Settings . . . . . . . . . . . . 4-5
Bit/Word Descriptions for the Configuration Block. . . . . . . 4-5
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Chapter 5
Module Status and Input Data
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
Reading Data From Your Module. . . . . . . . . . . . . . . . . . . . 5-1
Block Transfer with the Fast Millivolt Input Module . . . . . . 5-2
BTR Format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Chapter Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2
Chapter 6
Module Calibration
Chapter Objective . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1
Hot to Calibrate the Fast Millivolt Input Module . . . . . . . . . 6-1
Adjusting the Internal Offset Voltage. . . . . . . . . . . . . . . 6-2
Chapter 7
Troubleshooting
Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Diagnostics Reported by the Module . . . . . . . . . . . . . . . . . 7-1
Analog Input Module . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1
Appendix A
Specifications
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-1
Appendix B
Programming Examples
Sample Programs for the Analog Input Module . . . . . . . . . B-1
PLC-5 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . . B-1
PLC-3 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . . B-2
PLC-2 Family Processors . . . . . . . . . . . . . . . . . . . . . . . . . . B-3

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Appendix C
Data Formats
4-Digit Binary Coded Decimal (BCD). . . . . . . . . . . . . . . . . C-1
(12-bit) Binary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2
Appendix D
Block Transfer (Mini-PLC-2 and
PLC-2/20 Processors)
Mulitple GET Instructions - Mini-PLC-2 and
PLC-2/20 Processors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1
Setting the Block Length (Multiple GET Instructions only). . D-3
Appendix E
Installation Drawing
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . E-1

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