Rockwell Automation 1771-IFE, D17716.5.90 User Manual

Analog Input Module Cat. No. 1771IFE

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

This release of the publication contains updated information from the last release.

Updated Information

This release includes information previously included in a documentation update (publication 1771-6.5.90–RN1 dated March 1993).

In addition, many areas in this publication have been restructured or rewritten.

To help you find new and updated information in this release of the publication, we have included change bars as shown to the right of this paragraph.

SI

Summary of Changes

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

SI

Using This Manual P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Purpose Audience P1 Vocabulary P1 Manual Organization P1 Related Products P2 Product Related

of Manual

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Compatibility Publications

P1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

P3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Overview of the Analog Input Module 11. . . . . . . . . . . . . . . .

Chapter Module Description 11 Features 11 How Analog Modules Communicate with Programmable Controllers 12

Accuracy 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Summary 13

Objectives

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Installing the Input Module 21. . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Before Y Electrostatic Damage 21 Power Requirements 22 Module Module Keying 22 Wiring Your Input Module 23 Grounding 28 Changing Module Indicator Lights 212 Chapter Summary 212

Module

Chapter 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

Objectives

ou Install Y

Location in the I/O Chassis

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

the Module'

Installation

our Input Module 21. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

s Configuration 29. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming

Objectives

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

22. . . . . . . . . . . . . . . . . . . . . . .

212. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

31. . . . . . . . . . . . . . . . . . . . . . . . . . . .

31. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contentsii

Chapter Summary 35. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Your Module 41. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Configuring Your Input Module 41 Input Range Selection 42 Input Type 43 Data Format 43 Digital Real T Scaling 46 Default Chapter Summary 49

Objectives

. . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Filtering

ime Sampling

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuration

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

41. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

44. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

45. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

48. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Module Status and Input Data 51. . . . . . . . . . . . . . . . . . . . . .

Chapter Reading Data From Your Module 51 Block Transfer Read Format 52 Chapter Summary 52

Objectives

51. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Calibrating Your Module 61. . . . . . . . . . . . . . . . . . . . . . . . . .

Chapter Tools and Equipment 61 Calibration Procedure 61 Chapter Summary 63

Objectives

61. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Troubleshooting Your Input Module 71. . . . . . . . . . . . . . . . . .

Chapter Diagnostics Reported by the Module 71 Chapter Summary 73

Objective

71. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Specifications A1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Programming Examples B1. . . . . . . . . . . . . . . . . . . . . . . . . . .

Sample Programs for the Analog Input Module B1. . . . . . . . . . . . . . .

PLC2 Family Processors B1 PLC3 Family Processor B2 PLC5 Family Processors B4

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Data Table Formats C1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4Digit Binary Coded Decimal (BCD) C1. . . . . . . . . . . . . . . . . . . . . .

Signedmagnitude Binary C2 Two's Complement Binary C3

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Table of Contents iii

Block Transfer (MiniPLC2 and PLC2/20 Processors) D1. . .

Multiple GET Instructions  MiniPLC2 and PLC2/20 Processors D1. Setting the Block Length (Multiple GET Instructions only) D3

. . . . . . . .

Forms E1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Block Transfer Read E2. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Analog Block Transfer Write E3

. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Using This Manual

Preface

Purpose

of Manual

Audience

Vocabulary

Manual Organization

This manual shows you how to use your 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 before you attempt to program this module.

In this manual, we refer to:

- Each individual analog input module as the “input module”

- 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 modules

2 Installing the module

3 Module programming Sample programs

4 Module configuration

5 Module status and input data

6 Calibration Information on calibrating your module

7 Troubleshooting your module Troubleshooting guide for problem diagnosis

Description of the module including general and hardware features

Module power requirements, keying, chassis location Wiring of the field wiring arm

Hardware and software configuration Input range selection Data format

Reading data from the module Read block format

P-1

Preface

ube

Image

Block

Using This Manual

Topics CoveredTitleChapter

Appendix Title Topics Covered

A Specifications

B Programming Examples

Related Products

Product Compatibility

C Data Formats

Block transfer with MiniPLC2

and PLC2/20 processors

E Forms Useful forms for identifying your data table

Information on BCD, 2s complement binary, signed magnitude (12bit) binary

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-IFE module can be used with any 1771 I/O chassis. Communication between the discrete 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 transfer data and write block transfer data. I/O image table use is an important factor in module placement and addressing selection. Compatibility and data table use is listed in Table P.A.

P-2

Table P.A Compatibility

Catalog Number

1771IFE 8 8 20 37 Y Y Y A, B

= Compatible with 1771A1, A2, A4 B = Compatible with 1771A1B, A2B, A3B, A3B1, A4B Y = Compatible without restriction.

and Use of Data T

Use of Data Table Compatibility

Input

Ima

Bits

Output

Ima

Bits

able

Read

Block

Words

Write Block

Words

Addressing

1/2Slot 1Slot 2Slot

Chassis

Series

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.

Preface

Using This Manual

Do not put the module in the same module group as a discrete high density module. Avoid placing analog input modules close to ac modules or high voltage dc modules.

Publications

For a list of publications with information on Allen-Bradley programmable controller products, consult our publication index (SD499).

P-3

Chapter

Overview of the Analog Input Module

Chapter

Objectives

Module Description

Features

This chapter gives you information on:

features of the module how the input module communicates with programmable

controllers

The Analog 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 and requires no external power supply. (If using passive transducers for input, the user must supply loop power.) 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.

The Analog input module senses up to 16 single-ended or 8 differential analog inputs and converts them to a proportional four-digit BCD or twelve-bit binary value. You can select from five voltage or three current input ranges. Each input can be configured as a current or voltage input with internal jumpers.

This module’s features include:

16 single-ended or 8 differential inputs on one card User program selectable input ranges on a per channel basis (Table 1.A) Selectable real-time sampling Selectable scaling to engineering units Selectable digital filtering Selectable data format

1-1

Chapter 1

Overview of the Analog Input Module

How Analog Modules Communicate with Programmable Controllers

Table 1.A Program

Selectable Input Ranges

Voltage Current

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

The processor transfers data to the module (block transfer write) and from the module (block transfer read) 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 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



Between Processor and Module

I/O Chassis

Backplane

Input Module

Cat. No. 1771IFE

PC Processor

10947I

1-2

Chapter 1

Overview of the Analog Input Module

3. The module converts analog signals into binary or BCD format, and

stores theses 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

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 keying a chassis slot for your module wiring the input module’s field wiring arm configuring your module configuration plugs installing the input module

Before installing your input module in the I/O chassis:

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.

Key the backplane connector in the I/O chassis. Module Keying, page 22.

Make connections to the wiring arm.

Power Requirements, page 22.

Module Location in the I/O Chassis, page 22.

Wiring Your Input Module, page 23 and Grounding, page 28.

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 module requires 750mA from the backplane.

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 PC 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.

After determining the module’s location in the I/O chassis, connect the wiring arm to the pivot bar at the module’s location.

Module Keying

2-2

Use the plastic keying bands, shipped with each I/O chassis, for keying I/O slots to accept only one type of module.

The module is slotted in two places on the edge of the rear circuit board. The position of the keying bands on the backplane connector must correspond to these slots to allow insertion of the module. You can key any connector in an I/O chassis to receive this module except for the leftmost connector reserved for adapter or processor modules. Place keying bands between the following numbers labeled on the backplane connector (Figure 2.1):

between 10 and 12 between 24 and 26

Figure 2.1

Positions

Keying

Keying Bands

2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36

Chapter 2

Installing the Input Module

Wiring Your Input Module

1771IFE

12676

Connect your I/O devices to the cat. no. 1771-WG 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.

Input connections for the 1771-IFE with single-ended inputs are shown in Figure 2.2 and Figure 2.3. Input connections for the 1771-IFE with differential inputs are shown in Figure 2.4 and Figure 2.5.

Recommended maximum cable length for voltage-mode input devices is 50 feet. This recommendation is based on considerations of signal degradation and electrical noise immunity in typical industrial environments. Cable length for current-mode input devices need not be as restrictive because analog signals from these devices are less sensitive to electrical noise interference.

The 1771-IFE module is shipped from the factory set for a 1 to 5V DC voltage input. Refer to “Changing Your Module’s Configuration”on page

2-9 for other combinations of current and voltage inputs.

2-3

Chapter 2

Installing the Input Module

Figure 2.2 Connection

Diagram for 16 Singleended Inputs and T

Transmitters

2Wire

Transmitter

–

Source

All commons are electrically tied

together inside the module.

Jumper all unused channels to

module common to reduce noise.

Attention: Analog input signals must be within +14.25V referenced common and module common. If an input terminal channeltochannel crosstalk can cause invalid input readings and invalid underrange or overrange bits.

The 1771IFE module does not supply loop power for the input device. The user must supply loop power for looppowered input devices.

to module common.

This input signal includes any

mode voltage present between either input

exceeds this range,

terminal

Ground

woWire

Channel 1

Channel 2

Channel 3

Channel 4

Module Common

Channel 5

Channel 6

Channel 7

Channel 8

Module Common

Channel 9

Channel 10

Channel 11

Channel 12

Module Common

Channel 13

Channel 14

Channel 15

Channel 16

Module Common

1771WG

Field Wiring Arm

10948I

2-4

Chapter 2

Installing the Input Module

Figure 2.3 Connection

Diagram for 16 Singleended Inputs and FourW

Transmitters

–

4Wire

Transmitter

–

Source

All commons are electrically tied

together inside the module.

Jumper all unused channels to

module common to reduce noise.

The 1771IFE module does not supply loop power for the input device. The user must supply loop power for looppowered input devices.

to module common.

This input signal includes any

mode voltage present between either input

exceeds this range,

terminal

Ground

Channel 1

Channel 2

Channel 3

Channel 4

Module Common

Channel 5

Channel 6

Channel 7

Channel 8

Module Common

Channel 9

Channel 10

Channel 11

Channel 12

Module Common

Channel 13

Channel 14

Channel 15

Channel 16

Module Common

ire

1771WG

Field Wiring Arm

10948I

2-5

Chapter 2

Installing the Input Module

2Wire

Transmitter

Figure 2.4 Connection

–

+ –

Diagram for 8 Differential Inputs and T

Source Ground

NOTE:

1. Unused channels must have their + and  inputs jumpered together and tied to module common to reduce noise.

Attention: Analog input signals must be within +14.25V referenced

to module range, channeltochannel crosstalk can cause invalid input readings and invalid underrange or overrange bits.

common. If an input channel exceeds this

woW

Channel 1+

Channel 1

Channel 2+

Channel 2

Not used

Channel 3+

Channel 3

Channel 4+

Channel 4

Not used

Channel 5+

Channel 5

Channel 6+

Channel 6

Not used

Channel 7+

Channel 7

Channel 8+

Channel 8

Module Common

ire T

ransmitters

2-6

The 1771IFE module does not supply loop power for the input device. The user must supply loop power for looppowered input devices.

Configuring the module for differential inputs does not provide isolation.

1771WG

Field Wiring Arm

10949I

Chapter 2

Installing the Input Module

Figure 2.5 Connection

–

4Wire

Transmitter

–

+ –

Diagram for 8 Differential Inputs and FourW

Source

NOTE:

1. Unused channels must have their + and  inputs jumpered together and tied to module common to reduce noise.

Attention: Analog input signals must be within +14.25V referenced range, channeltochannel crosstalk can cause invalid input readings and invalid underrange or overrange bits.

The 1771IFE module does not supply loop power for the input device. The user must supply loop power for looppowered input devices.

to module

common. If an input channel exceeds this

Ground

Channel 1+

Channel 1

Channel 2+

Channel 2

Not used

Channel 3+

Channel 3

Channel 4+

Channel 4

Not used

Channel 5+

Channel 5

Channel 6+

Channel 6

Not used

Channel 7+

Channel 7

Channel 8+

Channel 8

Module Common

ire T

ransmitters

Configuring the module for differential inputs does not provide isolation.

1771WG

Field Wiring Arm

10949-I

2-7

+ 44 hidden pages