Rockwell Automation 1771-ILB, D17716.5.91 User Manual
Isolated Analog Input Module
Cat. No. 1771-IL Series B
User Manual
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, codes
and standards.
The illustrations, charts, sample programs and layout examples shown in
this guide are intended solely for 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
which 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 this manual we make notes to alert you to possible injury to
people or damage to equipment under specific circumstances.
ATTENTION: Identifies information about practices or
circumstances that can lead to personal injury or death, property
damage or economic loss.
Attention helps you:
Identify a hazard.
Avoid the hazard.
Recognize the consequences.
Important: Identifies information that is especially important for
successful application and understanding of the product.
Important: We recommend you frequently backup your application
programs on appropriate storage medium to avoid possible data loss.
Summary of Changes
Summary of Changes
Summary of Changes
This release of this publication contains new and revised information from
the last release.
New Information
This manual covers the series B version of the 1771-IL isolated input
module. The 1771-IL series B module has 16-bit resolution, improved
sample time, and auto-calibration.
Revised Information
Many areas in this manual have been modified. Change bars (as shown to
the right side of this paragraph) are used to indicate new or revised
information. Every chapter in this manual has been revised. Please read
carefully.
S-1
Using This Manual
Preface
Purpose of Manual
Audience
Vocabulary
Manual Organization
This manual shows you how to use your Isolated Analog Input module
with an Allen-Bradley programmable controller. It helps you install,
program, calibrate, and troubleshoot your module.
You must be able to program and operate an Allen-Bradley programmable
controller to make efficient use of your input module. In particular, you
must know how to program block transfers.
We assume that you know how to do this in this manual. If you do not,
refer to the appropriate programming and operations manual for your
programmable controller before you attempt to program this module.
In this manual, we refer to:
- the 1771-IL series B analog input module as the “input module,” or
the “1771-IL/B”
- the Programmable Controller as the “controller”
This manual is divided into seven chapters. The following chart shows
each chapter with its corresponding title and a brief overview of the topics
covered in that chapter.
Chapter Title Topics Covered
1 Overview of the input module
2 Installing the module
3
4 Configuring your module
5 Module status and input data Reading data from the module
6 Calibrating your module Information on calibrating your module
7 Troubleshooting Troubleshooting guide for problem diagnosis
Communicating with your
module
Description of the module including general and
hardware features
Module power requirements, keying, chassis
location
Wiring of the field wiring arm
Reading data from your module
Sample programs
Hardware and software configuration
Input range selection
Data format
P-1
Preface
mb
ck
Using This Manual
Appendix Title Topics Covered
A Specifications
B Configuration Example
Related Products
Product Compatibility
C Data Formats
D
Block transfer with Mini-PLC-2
and PLC-2/20 processors
Information on BCD, 2s complement binary, signed
magnitude
How to use GET-GET instructions
You can install your input module in any system that uses Allen-Bradley
programmable controllers with block transfer capability and the 1771 I/O
structure.
Contact your nearest Allen-Bradley office for more information about your
programmable controllers.
The 1771-IL series B module can be used with any 1771 I/O chassis.
Communication between the analog module and the processor is
bidirectional; the processor block-transfers output data through the output
image table to the module and block-transfers input data from the module
through the input image table. The module also requires an area in the data
table to store the read block and write block. I/O image table use is an
important factor in module placement and addressing selection. The
module’s data table use is listed in Table P.A.
P-2
T
able P
.A
Compatibility
Catalog
Number
1771-IL/B 8 8 15 37 Y Y Y A, B
A
= Compatible with 1771-A1, -A2, -A4
B = Compatible with 1771-A1B, -A2B, -A3B, -A4B
Y = Compatible without restriction.
and Use of Data T
Use of Data Table Compatibility
Input
Bits
Output
Image
Bits
Image
able
Read-
Blocks
Words
WriteBlo
Words
Addressing
1/2-Slot 1-Slot 2-slot
Chassis
Chassis
Series
Preface
Using This Manual
You can place your input module in any I/O module slot of the I/O chassis.
You can put two input modules in the same module group. You can put an
input and an output module in the same module group.
Do not put the module in the same module group as a discrete high density
module unless using 1- or 2-slot addressing. Avoid placing output modules
close to ac modules or high voltage dc modules.
Related Publications
For a list of publications with information on Allen-Bradley programmable
controller products, consult our publication index (SD499).
P-3
T
able of Contents
Overview of the Input
Module
Installing the Input Module
Chapter 1
Chapter Objectives 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Descriptions 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Features 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
How Analog Modules Communicate with Programmable Controllers 1-2.
Accuracy 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 2
Chapter Objectives 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Before You Install Your Input Module 2-1. . . . . . . . . . . . . . . . . . . . . . . . . .
Electrostatic Damage 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Requirements 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Location in the I/O Chassis 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Keying 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Wiring Your Input Module 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Grounding 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Setting the Voltage/Current Selection Jumpers 2-6. . . . . . . . . . . . . . . . . . . .
Module Installation 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Indicator Lights 2-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 2-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Communicating With Your
Module
Configuring Your Module
Chapter 3
Chapter Objectives 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer Programming 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-2 Programming 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-3 Programming 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
PLC-5 Programming 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Module Scan Time 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 3-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 4
Chapter Objectives 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuring Your Input Module 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Range Selection 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Block Transfer Write Format 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Data Format 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Digital Filtering 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Real Time Sampling 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Scaling 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Default Configuration 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
I
T
able of Contents
Module Status and Input
Data
Calibrating Your Module
Troubleshooting
Specifications
Chapter 5
Chapter Objectives 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Reading Data From Your Module 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 5-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 6
Chapter Objective 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Tools and Equipment 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Calibrating your Input Module 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
About Auto-calibration 6-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Performing Auto-calibration 6-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter Summary 6-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Chapter 7
Chapter Objective 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Diagnostics Reported by the Module 7-1. . . . . . . . . . . . . . . . . . . . . . . . . . .
Status Reported by the Module 7-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix A
Specifications A-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Configuration Example
Data Formats
Block Transfer (Mini–PLC–2
and PLC–2/20 Processors)
Appendix B
Sample Configuration of the Analog Input Module B-1. . . . . . . . . . . . . . . .
Appendix C
4–Digit Binary Coded Decimal (BCD) C-1. . . . . . . . . . . . . . . . . . . . . . . . . .
Signed–magnitude Binary C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Two’s Complement Binary C-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Appendix D
Multiple GET Instructions–Mini–PLC–2 and PLC–2/20 Processors D-1. . .
Setting the Block Length (Multiple GET Instructions only) D-3. . . . . . . . . .
II
Chapter
Overview of the Input Module
1
Chapter
Objectives
Module Descriptions
This chapter gives you information on:
features of the module
how the input module communicates with programmable
controllers
The input module is an intelligent block transfer module that interfaces
analog input signals with any Allen-Bradley programmable controllers that
have block transfer capability. Block transfer programming moves input
data words from the module’s memory to a designated area in the
processor data table in a single scan. It also moves configuration words
from the processor data table to module memory.
The input module is a single-slot module that requires no external power
supply. After scanning the analog inputs, the input data is converted to a
specified data type in a digital format to be transferred to the processor’s
data table on request. The block transfer mode is disabled until this input
scan is complete. Consequently, the minimum interval between block
transfer reads is the same as the total input update time for each analog
input module.
Features
This module senses up to eight analog signals at its inputs and converts
them to a proportional four-digit BCD or 16-bit binary value while
providing channel to channel and channel to ground isolation of +1000V.
You can select from five voltage or three current input ranges. Each input
is software selectable on a per channel basis.
This module’s features include:
Eight software configurable differential inputs
User program selectable input ranges on a per channel basis (see
Table 1.A)
Selectable real-time sampling
Selectable scaling to engineering units
Selectable digital filtering
+1000V input isolation, channel-to-channel, channel-to-ground
Selectable high and low input alarms
1-1
Chapter 1
Overview of the Input Module
T
able 1.A
Program
Selectable Input Ranges
Voltage Ranges Current Ranges
1 to 5V dc 4 to 20mA
0 to 5V dc 0 to 20mA
-5 to +5V dc -20 to +20mA
-10 to +10V dc
0 to 10V dc
How Analog Modules Communicate with Programmable Controllers
The processor transfers data to the module (block transfer write, BTW) and
from the module (block transfer read, BTR) using BTW and BTR
instructions in your ladder diagram program. These instructions let the
processor obtain input values and status from the module, and let you
establish the module’s mode of operation (Figure 1.1).
1. The processor transfers your configuration data, and alarm values to
the module via a block transfer write instruction.
2. External devices generate analog signals that are transmitted to the
module.
Figure 1.1
Communication
+
2
-
Between Processor and Module
3
I/O Chassis
Backplane
4
56
1-2
Input Module
Cat. No. 1771-IL/B
1
Programmable Controller
11845-I
Chapter 1
Overview of the Input Module
3. The module converts analog signals into binary or BCD format, and
stores these values until the processor requests their transfer.
4. When instructed by your ladder program, the processor performs a
read block transfer of the values and stores them in a data table.
5. The processor and module determine that the transfer was made
without error, and that input values are within specified range.
6. Your ladder program can use and/or move the data (if valid) before it
is written over by the transfer of new data in a subsequent transfer.
7. Your ladder program should allow write block transfers to the module
only when enabled by operator intervention or at power-up.
Accuracy
Chapter Summary
The accuracy of your input module is described in Appendix A.
In this chapter you read about the functional aspects of the input module
and how the module communicates with the programmable controller.
1-3
Chapter
Installing the Input Module
2
Chapter
Objectives
Before You Install Your Input Module
This chapter gives you information on:
calculating the chassis power requirement
choosing the module’s location in the I/O chassis
configuring your module voltage/current selection jumpers
keying a chassis slot for your module
wiring the input module’s field wiring arm
installing the input module
Before installing your input module in the I/O chassis you should:
You need to: As described under:
Calculate the power requirements of all modules
in each chassis.
Determine where to place the module in the I/O
chassis.
Select the input for each channel.
Key the backplane connector in the I/O chassis. Module Keying, page 2-4.
Make connections to the wiring arm.
Power Requirements, page 2-2.
Module Location in the I/O Chassis, page 2-2.
Setting the Voltage/Current Selection Jumpers,
page 2-2.
Wiring Your Input Module, page 2-5, and
Grounding, page 2-7
Electrostatic Damage
Electrostatic discharge can damage semiconductor devices inside this
module if you touch backplane connector pins. Guard against electrostatic
damage by observing the following precautions:
ATTENTION: Electrostatic discharge can degrade
performance or cause permanent damage. Handle the module as
stated below.
Wear an approved wrist strap grounding device, or touch a grounded
object to rid yourself 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.
2-1
Chapter 2
Installing the Input Module
Power Requirements
Module Location in the I/O Chassis
Your module receives its power through the 1771 I/O power supply. The
Isolated Analog input module requires 1.2A at 5V from the power supply.
Add this current to the requirements of all other modules in the I/O chassis
to prevent overloading the chassis backplane and/or backplane
power supply.
Place your module in any I/O module slot of the I/O chassis except for the
extreme left slot. This slot is reserved for programmable controller
processors or adapter modules.
Group your modules to minimize adverse affects from radiated electrical
noise and heat. We recommend the following.
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.
Setting the Voltage/Current Selection Jumpers
After determining the module’s location in the I/O chassis, connect the
wiring arm to the pivot bar at the module’s location.
The Isolated Analog Input Module (1771-IL/B) is shipped with each
channel set for voltage mode. If a milliamp input is desired, you must set a
jumper on the functional analog block (FAB) for that particular channel.
To set the selection jumpers for your desired inputs, proceed as follows:
1. Remove the module’s left hand cover plate (the one without
the labels).
2. Locate the selection plugs (Figure 2.1).
3. Position the jumpers as shown in Figure 2.1 for your
particular module.
4. Reassemble the module after you have finished checking and/or
setting the selection plugs.
2-2
Functional Analog Block
Figure 2.1
Configuration
Chapter 2
Installing the Input Module
Jumper Settings for 1771-IL/B Inputs
Voltage/Current
Jumper
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Jumper in
Current position.
Edge View
(enlarged)
Jumper in
Voltage position.
Side V
Channel 6
Channel 7
Channel 8
iew
11847-I
2-3
Chapter 2
Installing the Input Module
Installing the Analog Module
locking-bar pins
front of chassis
12453-I
To install your module in an I/O chassis:
1. First, turn off power to the I/O chassis:
ATTENTION: Remove power from the 1771 I/O chassis
backplane and disconnect the cable from the module before
removing or installing an I/O module.
Failure to remove power from the backplane could cause injury
or equipment damage due to possible unexpected operation.
Failure to remove power from the backplane could cause
module damage, degradation of performance, or injury.
2. Lift the locking latch holding the module into the chassis. (On chassis
equipped with a chassis locking bar, pull the locking-bar pins to
release the locking bar and swing it up.)
3. Position the keying bands (Figure 2.2) in the backplane connectors to
correspond to the key slots on the module. This prevents you from
inserting the wrong module in this slot. This analog module uses:
between 10 and 12
between 32 and 34
ATTENTION: Observe the following precautions when
inserting or removing keys:
insert or remove keys with your fingers
make sure that key placement is correct
Incorrect keying or the use of a tool can result in damage to
the backplane connector and possible system faults.
You can change the position of these bands if subsequent system
design and rewiring makes insertion of a different type of module
necessary. Use needlenose pliers to insert or remove keying bands.
2-4
Keying Band Location
Between 10 and 12
Between 32 and 34
Figure 2.2
Keying
Positions
I/O chassis
Keying Bands
ATTENTION: Insert or remove
keying bands with your fingers.
Chapter 2
Installing the Input Module
Connecting Wiring to Your Input Module
Upper Connector
11022-I
4. Place the module in the plastic tracks on the top and bottom of the
slot that guides the module into position.
5. Do not force the module into its backplane connector. Apply firm
even pressure on the module until it is firmly seated in the chassis.
Note: The chassis locking bar will not close if all modules are not
seated properly.
6. Snap the chassis locking bar (or locking latch on earlier chassis) over
the top of the module to secure it. Make sure the locking pins on the
locking bar are fully engaged.
7. Connect the wiring to the module as explained under “Connecting
Wiring” below.
Connect your input devices to the cat. no. 1771-WF wiring arm shipped
with the module. Attach the wiring arm to the pivot bar at the bottom of
the I/O chassis. It pivots upward and connects with the module so you can
install or remove the module without disconnecting the wires.
Connect inputs to the 1771-IL/B module as shown in Figure 2.3. This
module is shipped from the factory configured for voltage inputs but can
be configured for any combination of current and voltage inputs. If you
want to change the configuration, refer to “Setting the Voltage/Current
Selection Jumpers” as explained earlier in this chapter.
Important: The module configuration jumpers must be set for either
voltage or current before inserting the module into the I/O chassis.
2-5
Chapter 2
Installing the Input Module
Figure 2.3
Wiring
Connections for the Isolated Analog Input Module (1771-IL/B)
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Ground
Ground
+
Analog Source
–
+
Analog Source
–
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
NOTE: The 1771-IL/B module does not supply loop power for loop
powered analog sources (transmitters, transducers, etc.).
Loop power must be supplied by the user.
2-6
Field Wiring Arm
Cat. No. 1771-WF
11846-I
Chapter 2
Installing the Input Module
Grounding
Remove a length of cable
jacket from the Belden 8761
cable.
Belden
8761 Cable
When using shielded cable wire, ground the foil shield and drain wire only
at one end of the cable. We recommend that you wrap the foil shield and
drain wire together and connect them to a chassis mounting bolt
(Figure 2.4). At the opposite end of the cable, tape exposed shield and
drain wire with electrical tape to insulate it from electrical contact.
Figure 2.4
Cable
Grounding
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.
20104
Chassis Ground Single-point Grounding
When you connect grounding conductors to the I/O chassis
grounding stud, place a star washer under the first lug, then
place a nut with captive lock washer on top of each ground lug.
Ground Lug
Nut
Grounding Stud
Star
Washer
I/O Chassis Side Plate
1
Use
the cup washer if crimp-on lugs are not used.
Ground Lug
Nut and Captive
Washer
1
19480
19923
#10 Thread-forming screw
External-tooth Washers
Refer to Wiring and Grounding Guidelines, publication 1770-4.1, for additional information.
2-7
Chapter 2
Installing the Input Module
Indicator Lights
The front panel of the input module contains a green RUN and a red FLT
(fault) indicator (Figure 2.5). At powerup, an initial module self-check
occurs. If there is no fault, the red indicator turns off. The green indicator
will blink until the processor completes a successful write block transfer to
the module. Upon completion of a block transfer write (BTW), the green
RUN indicator will be on and the red FLT indicator will be off. If a fault is
found initially or occurs later, the red FLT indicator lights. Possible module
fault causes and corrective actions are discussed in Chapter 7,
Troubleshooting.
Figure 2.5
Diagnostic
Indicators
ISOLATED
ANALOG INPUT
RUN
FLT
10528-I
Chapter Summary
In this chapter you learned how to install your input module in an existing
programmable controller system and how to wire to the field wiring arm.
2-8
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