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

Publication 1771-6.5.119
ii Table of Contents
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

Publication 1771-6.5.119
Table of Contents iii
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

Publication 1771-6.5.119
iv Table of Contents

1Publication 1771-6.5.119
Chapter 2
Install the Module
Chapter Objectives
This chapter gives you information on:
• calculating the chassis power requirement
• choosing the module’s location in the 1771 chassis
• keying a chassis slot for your module
• wiring the input module’s field wiring arm
• installing the input module
Before You Install the
Module
Before you insert the module into the chassis, you must complete the
following.
Action required See
Calculate the power requirements of all
modules in each chassis Appendix A, Specifications
Determine where to place the module in the
I/O chassis Module Location in the 1771 Chassis on page 4
Key the backplane connector in the I/O
chassis Key the Backplane Connector on page 5
IMPORTANT This module is a modular component of the 1771 I/O system
requiring a properly installed system chassis. Refer to
publication 1771-IN075 for detailed information on acceptable
chassis along with proper installation and grounding
requirements. Limit the maximum adjacent slot power
dissipation to 10 W maximum.

Publication 1771-6.5.119
2-2 Install the Module
ATTENTION European Hazardous Location Approval
ASSOCIATED APPARATUS Certification
(The following applies when the product bears the Ex or EEx Marking)
This equipment is intended for use in potentially explosive atmospheres as defined by European Union
Directive 94/9/EC.
The LCIE (Laboratoire Central des Industries Electriques) certifies that this equipment has been found to
comply with the Essential Health and Safety Requirements relating to the design and construction of
apparatus for use in safe areas with Intrinsically Safe Circuits intended for use in potentially explosive
atmospheres, given in Annex II to this Directive.
Compliance with the Essential Health and Safety Requirements has been assured by compliance with EN
60079-0 and EN 60079-11.
WARNING •Equipment connected to the non-intrinsically safe side must not use or generate voltages greater than
250V rms.
•Provides intrinsically safe circuits with entity parameters of Voc = 38.2V, Isc = 40mA, Ca = 10nF, and La =
20mH when connected to thermocouples or other devices that do not contain energy storing or
generating components.
•Each intrinsically safe channel must use a shielded grounded cable. Cable inductance must be below the
Ca and La parameters of each intrinsically safe channel.

Publication 1771-6.5.119
Install the Module 2-3
ATTENTION Environment and Enclosure
This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category
II applications (as defined in IEC 60664-1), at altitudes up to 2000 m (6562 ft) without derating.
This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR 11. Without
appropriate precautions, there may be difficulties with electromagnetic compatibility in residential and
other environments due to conducted and radiated disturbances.
This equipment is supplied as open-type equipment. It must be mounted within an enclosure that is
suitably designed for those specific environmental conditions that will be present and appropriately
designed to prevent personal injury resulting from accessibility to live parts. The enclosure must have
suitable flame-retardant properties to prevent or minimize the spread of flame, complying with a flame
spread rating of 5VA, V2, V1, V0 (or equivalent) if non-metallic. The interior of the enclosure must be
accessible only by the use of a tool. Subsequent sections of this publication may contain additional
information regarding specific enclosure type ratings that are required to comply with certain product
safety certifications.
In addition to this publication, see:
Industrial Automation Wiring and Grounding Guidelines, for additional installation requirements,
Allen-Bradley publication 1770-4.1.
NEMA Standards 250 and IEC 60529, as applicable, for explanations of the degrees of protection provided
by different types of enclosure.
ATTENTION Prevent Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal
operation. Follow these guidelines when you handle this equipment:
•Touch a grounded object to discharge potential static.
•Wear an approved grounding wriststrap.
•Do not touch connectors or pins on component boards.
•Do not touch circuit components inside the equipment.
•Use a static-safe workstation, if available.
•Store the equipment in appropriate static-safe packaging when not in use.
WARNING The optional 17xx-xxx accessories are not certified for use in hazardous location applications.
Use these optional accessories only in nonhazardous location applications.

Publication 1771-6.5.119
2-4 Install the Module
Module Location in the
1771 Chassis
Place the module in any slot of the 1771 chassis except for the
left-most slot. This slot is reserved for the controller or adapter
modules.
We recommend the following when placing your modules:
• Group modules to minimize adverse affects from radiated
electrical noise and heat.
• Group analog input and low voltage DC modules away from AC
modules or high voltage DC modules to minimize electrical
noise interference.
• Do not place this module in the same I/O group with a discrete
high-density I/O module when using 2-slot addressing. This
module uses a byte in both the input and output image tables
for block transfer.
North American Hazardous Location Approval
The following information applies when operating this equipment
in hazardous locations. Informations sur l’utilisation de cet équipement en environnements dangereux.
Products marked "CL I, DIV 2, GP A, B, C, D" are suitable for use in Class I
Division 2 Groups A, B, C, D, Hazardous Locations and nonhazardous
locations only. Each product is supplied with markings on the rating
nameplate indicating the hazardous location temperature code. When
combining products within a system, the most adverse temperature code
(lowest "T" number) may be used to help determine the overall
temperature code of the system. Combinations of equipment in your
system are subject to investigation by the local Authority Having
Jurisdiction at the time of installation.
Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne conviennent qu'à une
utilisation en environnements de Classe I Division 2 Groupes A, B, C, D
dangereux et non dangereux. Chaque produit est livré avec des marquages
sur sa plaque d'identification qui indiquent le code de température pour les
environnements dangereux. Lorsque plusieurs produits sont combinés dans
un système, le code de température le plus défavorable (code de
température le plus faible) peut être utilisé pour déterminer le code de
température global du système. Les combinaisons d'équipements dans le
système sont sujettes à inspection par les autorités locales qualifiées au
moment de l'installation.
WARNING EXPLOSION HAZARD -
•Do not disconnect equipment unless power has
been removed or the area is known to be
nonhazardous.
•Do not disconnect connections to this equipment
unless power has been removed or the area is
known to be nonhazardous. Secure any external
connections that mate to this equipment by using
screws, sliding latches, threaded connectors, or
other means provided with this product.
•Substitution of components may impair
suitability for Class I, Division 2.
•If this product contains batteries, they must only
be changed in an area known to be
nonhazardous.
AVERTISSEMENT RISQUE D’EXPLOSION –
•Couper le courant ou s'assurer que l'environnement
est classé non dangereux avant de débrancher
l'équipement.
•Couper le courant ou s'assurer que l'environnement
est classé non dangereux avant de débrancher les
connecteurs. Fixer tous les connecteurs externes
reliés à cet équipement à l'aide de vis, loquets
coulissants, connecteurs filetés ou autres moyens
fournis avec ce produit.
•La substitution de composants peut rendre cet
équipement inadapté à une utilisation en
environnement de Classe I, Division 2.
•S'assurer que l'environnement est classé non
dangereux avant de changer les piles.

Publication 1771-6.5.119
Install the Module 2-5
Key the Backplane
Connector
With your fingers, insert the keying bands in the backplane connector
to correspond to the key slots on the module. This prevents you from
inserting the wrong module into the slot. For this module, place the
keying bands between the following connectors:
• 20 and 22
• 28 and 30
Install the Module and
Wiring Arm
Complete the following steps to install the module in the I/O chassis:
1. Remove power from the 1771 chassis.
18
20
22
24
26
28
30
32
16
44835
WARNING When used in a Class I, Division 2, hazardous location, this
equipment must be mounted in a suitable enclosure with proper
wiring method that complies with the governing electrical
codes.
WARNING If you insert or remove the module while backplane power is on,
an electrical arc can occur. This could cause an explosion in
hazardous location installations.
Be sure that power is removed before proceeding.

Publication 1771-6.5.119
2-6 Install the Module
2. On the 1771 chassis, lift the locking bar or locking tab for the
desired slot.
3. Attach the wiring arm, 1771-WD, to the horizontal bar at the
bottom of the chassis.
The wiring arm pivots upward and connects with the module so
you can install or remove the module without disconnecting the
wires.
4. Place the module in the plastic guides at the top and bottom of
the chassis.
5. Using firm and even pressure, push the module into the slot
until it is firmly seated in the chassis.
6. Snap the locking bar or tab over the module to secure it. Verify
that the locking bar pin is fully engaged.
7. Swing the wiring arm into place at the front of the module.
locking tab
locking bar pin
locking bar
1771 Chassis 1771 Series B Chassis
19809-C

Publication 1771-6.5.119
Install the Module 2-7
Wire the Module
Using the diagram below, connect your I/O devices to the wiring arm.
ATTENTION Total analog input cable connection length must be less than 15
meters (50 ft).
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Channel 1+
Channel 1-
Common 1 and 2
Channel 2+
Channel 2-
Channel 3+
Channel 3-
Common 3 and 4
Channel 4+
Channel 4-
Channel 5+
Channel 5-
Common 5 and 6
Channel 6+
Channel 6-
Channel 7+
Channel 7-
Common 7 and 8
Channel 8+
Channel 8-
Not used
Class I, DIV 1
Groups A,B,C and D
Nonhazardous or Class I, DIV 2
Groups A, B, C and D
44836

Publication 1771-6.5.119
2-8 Install the Module
Ground the Module
When using shielded cable wire, ground the foil shield and drain wire
only at on end of the cable. We recommend that you wrap the foil
shield and drain wire together and connect them to a chassis
mounting bolt. At the opposite end of the cable, tape exposed shield
and drain wire with electrical tape to insulate it from electrical contact.
Refer to the Industrial Automation Wiring and Grounding Guidelines,
publication 1770-4.1, for additional grounding information.
Chassis Ground
When you connect grounding conductors to the chassis grounding
stud, place a star washer under the first lug, then place a nut with a
captive lock washer on top of each ground lug.
20104-M
Remove a lenght of cable
jacket from the cable.
Pull the foil shield and bare drain
wire from the insulated wires.
Bare drain
wire
Insulated
wires
Foil shield
Twist the foil shield and drain
wire together to form a single
strand. Attach a ground lug.
19480