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

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

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

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

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Programming

Objectives

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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

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

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

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

Objectives

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

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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

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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

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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

Chapter 2

Installing the Input Module

Grounding

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 2.6). At the opposite end of the cable, tape exposed shield and drain wire with electrical tape to insulate it from electrical contact.

Figure 2.6 Cable

Remove a length of cable jacket from the Belden 8761 cable.

Belden

8761 Cable

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.

Pull the foil shield and bare drain wire from the insulated wires.

Foil shield

Chassis Ground Singlepoint Grounding

Grounding

Bare

drain

wire

Insulated wires

Twist the foil shield and drain wire together to form a single strand.

Attach a ground lug.

20104

Grounding Stud

I/O Chassis Side Plate

2-8

Star Washer

Use

the cup washer if crimpon lugs are not used.

Ground Lug

Nut

Nut and Captive Washer

Ground Lug

Shield and Drain twisted together

19480

Shield and Drain twisted together

#10 Threadforming screw

Externaltooth Washers

Refer

to Wiring and Grounding Guidelines, publication 17704.1 for additional information.

19923

Chapter 2

Installing the Input Module

Changing the Module's Configuration

The analog input module (1771-IFE) has configuration plugs for determining the input type (voltage or current) desired for each input. The module comes from the factory with the plugs positioned for voltage inputs.

To set the configuration plugs for your desired inputs, proceed as follows:

1. Remove the module’s covers by removing the four screws securing

the covers to the module.

2. Locate the selection plugs (Figure 2.7).

Figure 2.7 Configuration

Plug Locations

Selection Plugs

(refer to Figures 2.8, 2.9 and 2.10)

10950I

3. Position the plugs as shown in the Figures for your particular module

(Figures 2.8, 2.9 and 2.10).

4. Reassemble the module after you have finished checking and/or

setting the selection plugs.

2-9

Chapter 2

Installing the Input Module

Figure 2.8 Selection

Plug Settings for Differential or Singleended V

Differential or Singleended Current Inputs

Voltage

Differential or Singleended

storage positions

[1] [1] [1]

Differential Current

storage positions storage positions

Current

channel 1

channel 2

channel 3

channel 4

oltage or

Singleended Current

channel 1

channel 2

channel 3

channel 4

channel 5

channel 6

channel 7

channel 8

12677 12678

[1]

Positions 1 and 2 are not used.

Note:

Plugs are not needed for operation in the voltage mode.

channel 5

channel 6

channel 7

channel 8

channel 9

channel 10

channel 11

channel 12

channel 13

channel 14

channel 15

channel 16

10951I

2-10

Chapter 2

Installing the Input Module

Figure 2.9 Configuration Plug Settings for Singleended Voltage and Current Inputs on Adjacent Channels

[1]

channel 1 (single-ended voltage)

channel 2 (single-ended current)

channel 3 (single-ended current)

channel 4 (single-ended voltage)

positions 1 and 2 are not used[1]

Figure 2.10 Configuration Plug Settings for Differential Voltage and Current Inputs on Adjacent Channels

[1]

channel 1 (differential current)

channel 2 (differential voltage)

10952I

Note: Either dif

positions 1 and 2 are not used[1]

10953I

ferential and singleended configurations must be selected for the entire module.

2-11

Chapter 2

Installing the Input Module

Module Installation

When installing 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 wiring arm 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 or wiring arm could cause module damage, degradation of performance, or injury.

2. Place the module in the plastic tracks on the top and bottom of the

slot that guides the module into position.

3. Do not force the module into its backplane connector. Apply firm

even pressure on the module to seat it properly.

4. Snap the chassis latch over the top of the module to secure it.

5. Connect the wiring arm to the module.

Indicator Lights

Chapter Summary

The front panel of the input module contains a green RUN and a red FLT (fault) indicator (Figure 2.11). At power-up an initial module self-check occurs. If there is no fault, the red indicator turns off. The green indicator will be on when the module is powered. If a fault is found initially or occurs later, the red FLT indicator lights. Possible module fault causes and corrective action is discussed in Chapter 7, Troubleshooting.

Figure 2.11 Diagnostic

ANALOG

(12

RUN

FLT

Indicators

IN BIT)

Green RUN indicator

Red FLT indicator

10528I

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.

2-12

Module Programming

Chapter

Objectives

Block Transfer Programming

In this chapter we describe:

block transfer programming sample programs in the PLC-2, PLC-3 and PLC-5

processors

module scan time issues

Your module communicates with your processor through bidirectional block transfers. This is the sequential operation of both read and write block transfer instructions.

The block transfer write (BTW) instruction is initiated when the analog module is first powered up, and subsequently only when the programmer wants to write a new configuration to the module. At all other times the module is basically in a repetitive block transfer read (BTR) mode.

The application programs for the three processor families were written to accomplish this handshaking in the described manner. They are minimum programs; all the rungs and conditioning must be included in your application program. If you wish to disable BTRs for any reason, or add interlocks to the BTW rung to prevent writes from happening at certain times, you are allowed to do it. You may not eliminate any storage bits or interlocks that are included in our examples. If interlocks are removed, the program may not work properly.

The analog input module will work with a default configuration of zeroes entered in all five words of a five word BTW configuration block. See the configuration default section to understand what this

configuration will look like. Also, refer to Appendix B for example configuration blocks and instruction addresses to get started.

ATTENTION: In PLC-2 family processors you must not

enable both the read and write instructions at the same time.

Undesirable data could transfer, resulting in unpredictable

machine operation. Using the prescribed programs will prevent

this situation.

3-1

Chapter 3

Module Programming

PLC2 Programming

Rung 1

Block transfer read buffer: the filetofile move instruction holds the block transfer read (BTR) data (file A) until the processor checks the data integrity. If the data was successfully transferred, the processor energizes the BTR done bit, initiating a data transfer to the buffer (file R) for use in the program.

If the data is corrupted during the BTR operation, the BTR done bit is not energized and data is not transferred to the buffer file. In this case, the data in the BTR file will be overwritten by data from the next BTR.

Rungs 2 and 3

These rungs provide for a userinitiated block transfer write (BTW) after the module is initialized at powerup. Pressing the pushbutton locks out BTR operation and initiates a BTW that reconfigures the module. Block transfer writes will continue for as long as the pushbutton remains closed.

Rungs 4 and 5

These rungs provide a readwriteread" sequence to the module at powerup. They also make sure that only one block transfer (read or write) is enabled during a particular program scan.

Rungs 6 and 7

These rungs are the conditioning block transfer rungs. Include all the input conditioning shown in the example program.

The PLC-2 program example regulates when each block transfer will be initiated to eliminate problems caused by limited regulation of bidirectional block transfers. Both storage bits are needed, as shown in the example, to accomplish this task in all PLC-2 systems, local or remote, with long or short program scans. Therefore, the program as shown is the minimum required. Note that PLC-2 processors that do not have the block transfer instruction must use the GET-GET block transfer format which is outlined in Appendix E.

Figure 3.1 PLC2

Block Transfer Read

Done Bit

Pushbutton [1]

Block Transfer Write

Done Bit Pushbutton [1]

Block Transfer Write

Done Bit

Block Transfer Read

Done Bit

Power-up

Bit

Storage

Bit B

Power-up

Bit

Storage

Bit A

Family Sample Program Structure

FILE TO FILE MOVE COUNTER ADDR:

POSITION: FILE LENGTH: FILE A: FILE R: RATE PER SCAN

Power-up

Bit

Storage

Bit A

[1] You can replace the pushbutton with a timer done" bit to initiate the block transfer

write on a timed basis. You can also use any storage bit in memory.

BTR Done

Bit

Storage

Bit B

BTR

BLOCK XFER READ DATA ADDR: MODULE ADDR: BLOCK LENGTH: FILE:

BTW

BLOCK XFER WRITE DATA ADDR: MODULE ADDR: BLOCK LENGTH: FILE:

YYYY - XXXX

YYYY - XXX

XXXX - XXXX

XXX XXX XXX

XXX - XXX

XXX

RGS

XXX

RGS

ENABLE

DONE

ENABLE

DONE

Storage

Bit A

Storage

Bit A

Storage

Bit B

Storage

Bit B

ENABLE

DONE

10954I

3-2

Chapter 3

Module Programming

PLC3 Programming

Program Action

At powerup, the user program examines, the BTR done bit in the block transfer read file, initiates a block transfer write to configure the module, and then does consecutive block transfer reads continuously. The powerup bit can be examined and used anywhere in the program.

Rungs 1 and 2

Rungs 1 and 2 are the block transfer read and write instructions. The BTR done bit in rung 1, being false, initiates the first read block transfer. After the first read block transfer, the module performs a block transfer write and then does continuous block transfer reads until the pushbutton is used to request another block transfer write. After this single block transfer write is performed, the module returns to continuous block transfer reads automatically.

Block transfer instructions with the PLC-3 processor use one binary file in a data table section for module location and other related data. This is the block transfer control file. The block transfer data file stores data that you want transferred to your module (when programming a block transfer write) or from your module (when programming a block transfer read). The address of the block transfer data files are stored in the block transfer control file.

The industrial terminal prompts you to create a control file when a block transfer instruction is being programmed. The same block transfer

control file is used for both the read and write instructions for your module. A different block transfer control file is required for every

module.

A sample program segment with block transfer instructions is shown in Figure 3.2, and described below.

Figure 3.2

Family Sample Program Structure

PLC3

Block Transfer

Read

Done Bit

Pushbutton

Power-up

Bit

Block Transfer

Write

Done Bit

BTR

BLOCK XFER READ RACK: GROUP: MODULE: DATA: LENGTH = CNTL:

XXXXX=XXXX

XXXXX:XXXX

BTW

BLOCK XFER WRITE

RACK :

GROUP :

MODULE:

DATA:

LENGTH =

CNTL:

XXXXX = XXXX

XXXXX:XXXX

X=XXXX

X = XXXX

XXX

ENABLE

DONE

ERROR

ENABLE

DONE

ERROR

3-3

Chapter 3

Module Programming

PLC5 Programming

Program Action

Rungs 1 and 2

At powerup, the program enables a block transfer read and examines the powerup bit in the BTR file (rung 1). Then, it initiates one block transfer write to configure the module (rung 2). Thereafter, the program continuously reads data from the module (rung 1).

A subsequent BTW operation is enabled by a pushbutton switch (rung 2). Changing processor mode will not initiate a block transfer write.

The PLC-5 program is very similar to the PLC-3 program with the following exceptions:

1. You must use enable bits instead of done bits as the conditions on

each rung.

2. A separate control file must be selected for each of the block transfer

instructions. Refer to Appendix B.

Figure 3.3

Family Sample Program Structure

PLC5

BTR Enable

Bit

Pushbutton

Power-up Bit

BTW Enable

BTR BLOCK TRANSFER READ RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

BTW BLOCK TRANSFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

XX:XX XX:XX

X X

X N

X X

3-4

10956I

Chapter 3

Module Programming

Module

Scan T

ime

Scan time is defined as the amount of time it takes for the input module to read the input channels and place new data into the data buffer. Scan time for your module is shown in Appendix A.

The following description references the sequence numbers in Figure 3.4.

Following a block transfer write “1” the module inhibits communication until after it has configured the data “2,” performed self-calibration “3,” scanned the inputs “4,” and filled the data buffer “5.” Write block transfers, therefore, should only be performed when the module is being configured or calibrated.

Any time after the second scan begins “6,” a BTR request “7” can be acknowledged. This interrupts the scan and the BTR empties the buffer.

Following the BTR, the input module inhibits block transfer communications with the programmable controller until it has scanned its inputs “8” and new data is ready ”9.” The input module repeats the scan sequence “10,” updating the input values until another block transfer request is received. Therefore, BTRs will only be completed as frequently as the total scan time of the input module.

Figure 3.4

Block

ransfer T

ime

Chapter Summary

End of block

transfer write

Block

Transfer

Write

time

1 2 3 4 56789

Note: Configure/Calibration time:

Configure

time

Singleended mode = 100ms without filter, 102ms with filter Differential mode = 56ms without filter, 58ms with filter

Scan time:

= 12.5 ms for 8 differential inputs (no scaling or digital filter); = 25 ms for 16 singleended inputs (no scaling or digital filter)

Calibration

time

See note

Module available to

perform block transfer

1st

Scan

2nd

Scan

3rd

Scan

In this chapter, you learned how to program your programmable controller. You were given sample programs for your PLC-2, PLC-3 and PLC-5 family processors.

You also read about module scan time.

12689

3-5

Configuring Your Module

Chapter

Objectives

Configuring Your Input Module

In this chapter you will read how to configure your module’s features, condition your inputs and enter your data.

Because of the many analog devices available and the wide variety of possible configurations, you must configure your module to conform to the analog device and specific application that you have chosen. Data is conditioned through a group of data table words that are transferred to the module using a block transfer write instruction. Before continuing, make sure you read “Setting Module Selection Plugs” in chapter 2.

The software configurable features available with the Analog Input Module (cat. no. 1771-IFE) are:

input range selection input type data format digital filtering real time sampling scaling to engineering units

Note that digital filtering and scaling values must be entered in BCD format only. Change your display format to BCD in the PLC-5 and PLC-3 to accomplish this.

Note: Programmable controllers that use 6200 software programming tools

can take advantage of the IOCONFIG utility to configure this module. IOCONFIG uses menu-based screens for configuration without having to set individual bits in particular locations. Refer to your 6200 software literature for details.

Note: Programmable controllers that use process configuration and operation software (cat. no. 6190–PCO) can take advantage of those development and runtime tools used for the application of programmable controllers in process control. The PCO worksheets and the menu-driven configuration screens and faceplates let you configure, test/debug and operate the I/O module. Refer to your 6190-PCO software literature for details.

4-1

Chapter 4

Module Configuration

Input Range Selection

You can configure the module to operate with any of five voltage or three current ranges. You can select individual channel ranges using the designated words of the write block transfer instruction (Table 4.A). Use BTW word 1 for range selection of channels 1 through 8, and BTW word 2 for channels 9 through 16. Two bits are allocated for each channel. For example, for channel 1, set word 1 bits 00-01 as shown in Table 4.A.

Table 4.A

Range Selection Bits

Input

Bit 01 Bit 00 Voltage or current input

0 0 1 to 5 V DC, 4 to 20 mA

0 1 0 to 5 V DC, 0 to 20 mA

1 0 5 to +5 V DC, 20 to +20 mA

1 1 10 to +10 V DC2, 0 to 10 V DC

Current input mode selected by configuration plug.

Configurable

using bipolar scaling.

1,2

Table 4.B shows the incremented voltage or current assigned to each bit for the seven different input ranges. For example, if the channel 1 input range is 0 to +5V and the actual incoming signal is at mid-range (+2.5V) the value in the module’s data word would be 0000 1000 0000 0000 (binary) or 2048 (decimal). The input is 2048/4096, or 1/2 of full scale.

Table 4.B

oltage and Current Ranges for the Analog Input Module

Input

Nominal Voltage or

Current Range

+1 to +5V 0000 to +4095 0000 to + 4095 0.98mV

0 to 5V 0000 to +4095 0000 to +4095 1.22 mV

5 to +5V 4095 to +4095 4095 to +4095 1.22mV

10 to +10V 4095 to +4095 4095 to +4095 2.44mV

0 to +20mA 0000 to +4095 0000 to +4095 .0049mA

+4 to +20mA 0000 to +4095 0000 to +4095 .0039mA

20 to +20mA 4095 to +4095 4095 to +4095 .0049 mA

Note: Voltage

and current input ranges are selectable on a per channel basis.

Corresponding 4Digit

BCD Output Range

Corresponding 12Bit

Binary Output Range

Current Per Bit

Voltage or

4-2

Chapter 4

Module Configuration

Input Type

Data Format

You can select single-ended or differential inputs using the designated bit in the configuration file. Inputs to a particular module must be all single-ended or all differential. Set BTW word 3, bit 08 (bit 10 octal) as shown in Table 4.C.

Table 4.C Selecting

Decimal Bit 8 (Octal Bit 10)

Singleended or Differential Inputs

Input type

1 differential inputs

0 singleended inputs

You must also indicate what format will be used to read data from your module. Typically, you select BCD with PLC-2 processors, and 2’s complement binary with PLC-3 and PLC-5 processors. See Appendix C for details on data format. You use BTW word 3 bits 09-10 (11-12 octal) to set the data format (Table 4.D).

Table 4.D Selecting

the Data Format

Decimal Bit 10

(Octal Bit 12)

0 0 BCD

0 1 not used

1 0 two's complement binary

1 1 signed magnitude binary

Decimal Bit 09

(Octal Bit 11)

Data Format

4-3

Chapter 4

Module Configuration

Digital Filtering

The module has hardware-based high frequency filters on all channels to reduce the effect of electrical noise on the input signal. Software digital filtering is meant to reduce the effect of process noise on the input signal. Digital filtering is selected using BTW word 3, bits 00-07.

The digital filter equation is a classic first order lag equation (Figure 4.1). Using a step input change to illustrate the filter response (Figure 4.2), you can see that when the digital filter constant time elapses, 63.2% of the total response is reached. Each additional time constant achieves 63.2% of the remaining response.

Figure 4.1

Filter Equation

Digital

Yn = Y

Where:

- Y

n-1

t + TA

n = present output, filtered peak voltage (PV)

n -1 = previous output, filtered PV

t = module channel update time (seconds)

= digital filter time constant (seconds)

n = present input, unfiltered PV

n-1

)

Figure 4.2 Digital Filter Lag Equation Illustration

100%

63%

Amplitude

0 0.01 0.5 0.99 Time in Seconds

Unfiltered Input TA = 0.01 sec TA = 0.5 sec TA = 0.99 sec

16723

Digital filter time constant values of 0.00 BCD to 0.99 BCD (0.00 BCD = no filter; 0.99 BCD = maximum filter) are set in bits 00 through 07 of word 3 of the block transfer write instruction. If an invalid digital filter value is entered (i.e., 0.1F), bit 02, word 1 of the block transfer read instruction will be set. If an invalid digital filter value is entered, the module will not perform digital filtering. If you use the digital filtering feature, the filter time constant value chosen will apply to all input signals.

4-4

Chapter 4

Module Configuration

Real Time Sampling

The real time sampling (RTS) mode of operation provides data gathered at precisely timed intervals for use by the processor. BTW word 3 bits 11–15 (13–17 octal) are used to set the real time sampling interval.

RTS is invaluable for time based functions (such as PID and totalization) in the PLC. It allows accurate time based calculations in local or remote I/O racks. In the RTS mode the module scans and updates its inputs at a user defined time interval (T) instead of the default interval. The module ignores block transfer read (BTR) requests for data until the sample time period elapses. The BTR of a particular data set occurs only once at the end of the sample period and subsequent requests for transferred data are ignored by the module until a new data set is available. If a BTR does not occur before the the end of the next RTS period, a time-out bit is set in the BTR status area. When set, this bit indicates that at least one data set was not transferred to the processor. (The actual number of data sets missed is unknown.) The time-out bit is reset at the completion of the BTR.

Set appropriate bits in the BTW data file to enable the RTS mode. You can select RTS periods ranging from 100 milliseconds (ms) to 3.1 seconds. Refer to Table 4.E below for actual bit settings. Note that the default mode of operation is implemented by placing all zeroes in bits 11–15 (13–17 octal).

Decimal Bits 15 14 13 12 11

Octal Bits 17 16 15 14 13

0 0 0 0 0 No RTS, Default settings 1 0 0 0 0 1.6s

0 0 0 0 1 100ms 1 0 0 0 1 1.7s

0 0 0 1 0 200ms 1 0 0 1 0 1.8s

0 0 0 1 1 300ms 1 0 0 1 1 1.9s

0 0 1 0 0 400ms 1 0 1 0 0 2.0s

0 0 1 0 1 500ms 1 0 1 0 1 2.1s

0 0 1 1 0 600ms 1 0 1 1 0 2.2s

0 0 1 1 1 700ms 1 0 1 1 1 2.3s

0 1 0 0 0 800ms 1 1 0 0 0 2.4s

0 1 0 0 1 900ms 1 1 0 0 1 2.5s

0 1 0 1 0 1.0s 1 1 0 1 0 2.6s

0 1 0 1 1 1.1s 1 1 0 1 1 2.7s

0 1 1 0 0 1.2s 1 1 1 0 0 2.8s

0 1 1 0 1 1.3s 1 1 1 0 1 2.9s

0 1 1 1 0 1.4s 1 1 1 1 0 3.0s

0 1 1 1 1 1.5s 1 1 1 1 1 3.1s

Default

Settings =

Singleended inputs  25 ms Dif

ferential inputs  12.5 ms

Table 4.E

Settings for the Real T

Bit

ample Time Perio

ime Sample Mode

15 14 13 12 11

ample Time Perio

17 16 15 14 13

4-5

Chapter 4

Module Configuration

Scaling

Your module can perform linear conversion of unscaled data to engineering units, (for example; gallons/minute, degrees C/degrees F and pounds/square inch). Unscaled data in the module has a range of : 0 through 4095 for the polar ranges (0 to 5V DC/0 to 20mA and 1 to 5V DC/4 to 20mA); and -4095 to +4095 (8190) for the bipolar ranges (+

5V/+20mA and +10V). BTW words 6 through 37 are the scaling words for channels 1 through 16. Channel 1 minimum scaling values are set in word 6, and maximum scaling values are set in word 7. Channel 2 minimum scaling values are set in word 8, and maximum scaling values are set in word 9, and so on for the other channels.

The format of this data is 4-digit BCD or 12-bit binary. The resolution at the module of scaled values is the same as for unscaled data: one part in 4095 for 0 to 5V DC/0 to 20mA and 1 to 5V DC/4 to 20mA ranges; and one part in 8190 for the + processor, however, is determined by the scaled ranges (i.e., if 0 = minimum and 500 = maximum, resolution is now 1 part in 500). Each input channel can be scaled independently of the other channels.

Note: To achieve the 0 to +10V range you must use bipolar scaling. Select the +

10V range and scale for + the actual intended range. If you need 0 to 100 gpm, set scaling values at -100 and +100. You will effectively be creating a 0 to 10V range that is scaled from 0 to 100.

5V/+20mA and +10V ranges. Resolution at the

Implementing the Scaling Feature

You implement the scaling feature by:

1. Inserting minimum and maximum scaled values in the appropriate

configuration words

2. If any of the minimum or maximum values are negative, set the

appropriate sign bits in the minimum or maximum sign bit word

3. If a single channel is scaled, all channels must be scaled, and all 37

configuration words must be written to the module.

Scaling Ranges

The maximum range of the scaling values is +9999 BCD. These values must be entered in BCD.

Typically, invalid values are “minimum greater than maximum,” or “minimum equal to maximum.” If invalid values are entered into the

scaling words, the corresponding input in the BTR data will be zero and the invalid scaling bit will be set.

4-6

Chapter 4

Module Configuration

Important: Scaling values must always be entered in BCD format,

even if the data format chosen is binary. If scaling is selected for any channel, all channels must be scaled. If scaling is not required on certain channels, set those to the default input range: 0 to 4095 for 0 to + voltage or current ranges, and -4095 to +4095 for - to + voltage or current ranges.

If scaling is not selected, the module requires specific minimum BTR file lengths for the number of channels used. The BTW file length can

be set to 3 words. Table 4.F shows the required BTW and BTR file lengths.

Table 4.F Block

ransfer Read and W

rite File Lengths

Channels

Used

1 5 7

2 6 9

3 7 11

4 8 13

5 9 15

6 10 17

7 11 19

8 12 21

9 13 23

10 14 25

11 15 27

12 16 29

13 17 31

14 18 33

15 19 35

16 20 37

BTR File

Length

BTW File

Length

Important: Use decimally addressed bit locations for PLC-5 processors.

4-7

Chapter 4

Module Configuration

Default Configuration

If a write block of five words, with all zeroes, is sent to the Analog Input Module (cat. no. 1771-IFE), default selections will be:

1 to 5V DC or 4 to 20mA (dependent on configuration jumper setting) BCD data format no real time sampling (RTS) no filtering no scaling single-ended inputs

Figure 4.3

Input Module (1771IFE) Block T

Analog Block

Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word 1 8 7 6 5 4 3 2 1 Range Selection  Channels 1 thru 8

2 16 15 14 13 12 11 10 9 Range Selection  Channels 9 thru 16

3 Real Time Sampling

Data

Format

Input Type

Digital Filter

ransfer W

rite Configuration

Description

Real time sampling, data format, input type and digital filter

4 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Sign Bits, minimum scaling values

5 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Sign Bits, maximum scaling values

6 Channel 1  minimum scaling

7 Channel 1  maximum scaling

8 Channel 2  minimum scaling

9 Channel 2  maximum scaling

10 Channel 3  minimum scaling

⇓⇓⇓⇓

37 Channel 16  maximum scaling

4-8

Word

Chapter 4

Module Configuration

Bit/Word Descriptions for the Analog Input Module Block Transfer Write Configuration Block

Note that decimal bits are shown, with octal bits in parentheses.

Decimal

Bit

(Octal Bit)

Description

Word 1 and 2

Word 3

Word 4

Word 5

Words 637

Bits 0015

(0017)

Bits 0007

(0007)

Bit 08

(10)

Bits 0910

(0710)

Bits 1115

(1317)

Bits 0015

(0017)

Bits 0015

(0017)

Bits 0015

(0017)

Input range selections allow the user to configure the inputs for any of 7 input voltage or current ranges. Two bits are required for each channel. See Table 4.A.

Digital filter reduces effect of noise on input. See "Digital Filtering" on page 44.

Input type, set bit for differential mode on all channels. Reset (0) = singleended. Refer to Table 4.C

Data format matches format of processor. See Table 4.D.

Real time sampling will default to 12.5ms for differential mode and 25ms for singleended, greater with filtering selected. See appendix A for timing details. See Table 4.E for other real time intervals.

Minimum sign bits, when set, designate negative minimum scaling values for the corresponding input channels. Bit 00 corresponds to channel 1, bit 01 corresponds to channel 2, etc.

Maximum sign bits, when set, designate maximum scaling values that are negative. Maximum scaling value must be greater than minimum on any particular channel. Bit 00 corresponds to channel 1, bit 01 corresponds to channel 2, etc.

Minimum and maximum scaling values for each channel. Enter in BCD format.

Chapter Summary

In this chapter you learned how to configure your module’s features, condition your inputs and enter your data.

4-9

Chapter

Module Status and Input Data

Chapter

Objectives

In this chapter you will read about:

reading data from your module block transfer read block format

Reading Data From Your Module

Block transfer read programming moves status and data from the input module to the processor’s data table in one I/O scan (Figure 5.1). The processor’s user program initiates the request to transfer data from the input module to the processor.

Figure 5.1

Assignments for Analog Input Module (1771IFE)

Word Block T

ransfer Read

Decimal Bits 15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00

Description

Octal Bits 17 16 15 14 13 12 11 10 07 06 05 04 03 02 01 00

Word 1 Not Used Diagnostic Bits Diagnostics

2 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Data underrange for channels 1-16

3 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Data overrange for channels 1-16

4 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Data polarity for channels 1-16

Description

5 Channel 1 Input Channel 1 Input

6 Channel 2 Input Channel 2 Input

7 Channel 3 Input Channel 3 Input

8 Channel 4 Input Channel 4 Input

⇓⇓⇓⇓

20 Channel 16 Input Channel 16 Input

These

bits are set (1) at approximately the input range limits selected (

Table 5.B).

5-1

Chapter 5

Module Status and Input Data

Block Transfer Read Format

Word 1

Word 2

Word 3

The bit/word description for the block transfer read of the Analog Input Module is described below in Table 5.A.

Table 5.A

ord Format for the Analog Input Module

BTR

Decimal

Word

Bit

(Octal Bit)

Bit 00

Bit 01

Bit 02

Bit 03

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Description

Power up bit is used by the module to tell the processor that it is alive

but not yet configured. It is a key element in the application program.

Out of range bit is sent to tell the processor that one or more channels are either over or under range.

Invalid scaling bit reports that the scaling is somehow invalid. Usually, both values are equal or minimum is greater than maximum when this bit comes on. Can also be an invalid filter value.

Real time sample fault bit. This bit is set if the module is configured for RTS and a block transfer read has not occurred within the user-programmed period.

Individual underrange bits for each channel. Bit 00 for channel 1, bit 01 for channel 2, etc.

These bits are set (1) at approximately the input

range limits selected from Table 5.B.

Individual overrange bits for each channel. Bit 00 for channel 1, bit 01 for channel 2, etc.

These bits are set (1) at approximately the

input range limits selected from Table 5.B.

Chapter Summary

Word 4

Bits 00-15

(00-17)

Polarity bits are set when input is less than zero. Bit 00 for channel 1, bit 01 for channel 2, etc.

Word 5 thru 20 Input values. Word 5 for channel 1, word 6 for channel 2, etc.

Attention: If

invalid input readings and invalid underrange/overrange bits.

an input terminal'

s voltage exceeds +

14.25V as referenced to module common, channeltochannel crosstalk can cause

Table 5.B

Range Selection

Input

Voltage input Current input

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

Current input mode selected by configuration plug.

Configurable

using bi-polar scaling.

In this chapter you learned the meaning of the status information that the input module sends to the processor.

5-2

Calibrating Your Module

Chapter

Objectives

Tools and Equipment

Calibration Procedure

In this chapter we tell you what tools you need and how to calibrate your module.

In order to calibrate your input module you will need the following tools and equipment:

Equipment Description

Digital voltmeter

Alignment tool

Potentiometer sealant

Industrial terminal

Backplane extender card Cat. no. 1771EZ

The analog input module is shipped from the factory already calibrated. If necessary to recalibrate the module, you must calibrate the module in an I/O chassis. The module must communicate with the processor and industrial terminal. Calibration consists of adjusting the 10V reference and nulling the input offset.

51/2 digit, 0.01% accuracy minimum: Keithley191 or Fluke 8300A or equivalent

P/n 35F616, for pot adjustment: Newark Electronics, 500 N.Pulaski Rd., Chicago, IL

Torque Seal: Organic Products, P.O. Box 928, Irving, TX

Cat. no. 1770T3 and program panel interconnect cable (cat. no. 1772TC) for PLC2 family processors: AllenBradley,Highland Hts., OH

Important: The module must be powered up for at least 30 minutes before attempting to calibrate.

ATTENTION: Do not attempt to calibrate your module until you have read and thoroughly understand this procedure. Also, do not attempt to calibrate this module in an operating system. Damage to the equipment or personal injury may result.

6-1

Chapter 6

Calibrating Your Module

Adjusting the 10V Reference

1. Turn off power to your processor and I/O chassis.

2. Swing the field wiring arm out of the way.

3. Remove the module from the I/O chassis.

4. Plug the module into the extender card, and insert the extender card

into the I/O chassis.

5. Attach the negative lead to an analog common (pin 5, 10, 15, 20 or

21) of the wiring arm.

6. Attach the positive lead of your voltmeter to TP1.

7. To set the on-board +10V reference, adjust potentiometer R64

(Figure 6.1) until the value at TP1 = 10.0000V (+

.0002V maximum).

Figure 6.1 Test

E1 Jumper in calibration position

Points and Potentiometers for Analog Input Module (1771IFE)

Left

Side of Module

6-2

TP1TP2R64R63

10956I

Chapter 6

Calibrating Your Module

Nulling the Input Offset

After completing the 10V reference adjustment, turn off power to your processor and I/O chassis and complete the following steps.

1. Move jumper E1 (Figure 6.1) from the default position (connecting

the center and right posts) to the calibration position (connecting the center and left posts).

2. Attach the negative lead of your voltmeter to an analog common (pin

5, 10, 15, 20 or 21) of the field wiring arm.

3. Attach the positive lead of your voltmeter to TP2.

4. Turn on power to your processor and I/O chassis. Check to make

sure the red FLT indicator is lit and the green RUN indicator is off. If the red indicator is off, check the position of E1.

Chapter Summary

5. Adjust potentiometer R63 (Figure 6.1) until the value at

TP2 = 0.0000V (+

0.0002V maximum).

6. After completing the adjustment, remove power from the I/O chassis

and return jumper E1 to the default position.

In this chapter you learned how to calibrate your module. This included the necessary tools, adjusting the 10V reference, and nulling the offset.

6-3

Chapter

Troubleshooting Your Input Module

Chapter

Objective

Diagnostics Reported by the Module

In this chapter, we describe how to troubleshoot your module by observing the indicators and by monitoring status bits reported to the processor.

At power-up, the module momentarily turns on the red indicator as a lamp test, then checks for:

correct RAM operation firmware errors

Thereafter, the module lights the green RUN indicator when operating without fault, or lights the red FAULT indicator when it detects fault conditions. The module also reports status and specific faults (if they occur) in every transfer of data (BTR) to the PC processor. Monitor the green and red indicators and status bits in word 1 of the BTR file when troubleshooting your module.

Figure 7.1 Diagnostic

Indicators

ANALOG

IN BIT)

(12

RUN

FLT

10528I

Diagnostic Bits Reported By the Analog Input Module

Diagnostic bits in the read block transfer status words provide diagnostic capabilities.

Word 1 provides power-up and valid data status. Words 2, 3 and 4 provide channel data status.

If a module on-board self test fault occurs, block transfers will be inhibited, the red fault (FLT) will light, and the green run (RUN) light will go out.

7-1

Chapter 7

Troubleshooting Your Input Module

Word 1

Diagnostics word 1 is the first data word in the read block transfer file for transfer to the central processor. It contains a power-up bit (bit 00) that is set (1) when the module is first powered up. It is reset (0) after a write block transfer. It also contains an under-range or over-range bit (bit 01) that is set when any input is under or over-range.

An invalid scaling data bit (bit 02) will be set if invalid scaling data is entered into any of the minimum/maximum scaling value words. Note that minimum equal to maximum is an invalid value. If invalid values are entered into the minimum or maximum scaling words the corresponding read block transfer input channel word will be set to 0000.

Bit 02 will also be set if an invalid digital filter value is entered (e.g., 1F). If an invalid digital filter value is entered, the module will not perform digital filtering.

The real time sample (RTS) fault bit (bit 03) is set if the module is configured for RTS and a block transfer read has not occurred within the user-programmed period.

Word 2

Word 2 provides for under-range conditions. When a particular channel input is under-range, the associated bit will be set. As long as inputs are under range the associated bit will remain set. Bit 00 corresponds to channel 1, bit 01 to channel 2, etc.

Word 3

Word 3 provides for over-range conditions. When a particular channel input is over-range, the associated bit will be set. As long as inputs are in range the associated bit will remain reset. Bit 00 corresponds to channel 1, bit 01 to channel 2, etc.

Word 4

Word 4 provides an indication of a particular channel’s input polarity (set, or 1 = negative; reset, or 0 = positive). Bit 00 corresponds to channel 1, bit 01 to channel 2, etc.

Table 7.A lists the probable cause and recommended actions for a number of common trouble indications.

7-2

Chapter 7

Troubleshooting Your Input Module

Legend

Off

Table 7.A Troubleshooting

Indicators Probable Cause Recommended Action

RUN (green) FLT (red)

Chart for Analog Input Module (1771IFE)

Normal operation None

If outofrange bit is set (BTR word 1, bit

02) and all 8 underrange bits are set (BTR word 2, bits 00 through 07).

If incorrect data in final storage word locations in processor's data table, possible severed or disconnected input cable associated with the affected channels.

Input module is conditioned for BCD instead of binary or the reverse, incorrect scaling, sign bits missing, wrong range.

Hardware failure in module Return module for repair.

Return module for repair

Repair/replace cable.

Condition module for desired format (BCD or binary), enter correct data and initiate another write block transfer.

If module connections are intact and configuration data is correct check calibration procedure.

Chapter Summary

RUN Neither LED FLT comes on

In this chapter you learned how to interpret the indicator lights, and troubleshoot your input module.

No power PICO fuse is bad.

Turn off power. Remove and reinsert module into chassis. Return power. If problem still exists, and chassis power supply is functioning properly, return the module for repair.

7-3

Appendix

Specifications

Inputs per module 16 single-ended; 8 differential low level

Module Location 1771 I/O rack - 1 slot

+1 to +5V dc 0 to 5V dc

Input voltage ranges (nominal)

Input current ranges (nominal)

Resolution 12-bit binary

Accuracy 0.1% of full scale range @ 25oC

Linearity +1 LSB

Repeatability +1 LSB

Isolation Voltage +1500V, (transient)

Input overvoltage protection

Input overcurrent protection (current ranges) 30mA

Common mode voltage +14.25 Volts

Input impedance 100 Megohms for voltage ranges; 250 ohms for current ranges

Common mode rejection 80 db, DC-120 Hz

Current Requirements 0.75A @ +5V from I/O chassis backplane

Power Dissipation 3.75 Watts (maximum)

Thermal Dissipation 12.8 BTU/hr (maximum)

Unscaled BCD and binary output to processor

Engineering units sent to processor +999910 with selectable scaling

Internal scan rate

Environmental conditions

operational temperature: storage temperature: relative humidity:

Conductors Wiring

Index

BCD, 41

BCD format, 13, 47

digital filtering and scaling, 41

block transfer, 11, 13, 22, 71

communication using, 12 read and write file lengths, 47 write, 12

block transfer read, 31, 32, 51, 72

bit/word format, 52 word assignments, 51

block transfer write, 32

configuration block, 48 filter settings, 44 input range selection, 42 programming, 31

calibration

adjusting the 10V reference, 62 nulling the offset, 63 tools and equipment, 61

calibration procedure, 61

compatibility, P2

configuration block

bit/word descriptions, 49 block transfer write, 48

configuration plugs, setting

differential or single-ended voltage and

current inputs, 210

differential voltage and current inputs,

adjacent channels, 211

singleended voltage and current inputs,

adjacent channels, 211

configuration/calibration time, 35

connection diagram

16 single-ended inputs

2-wire transmitters, 24 4-wire transmitters, 25

8 differential inputs

2-wire transmitters, 26 4-wire transmitters, 27

considerations, pre-installation, 21

data format, 43

bit selection settings, 43

data formats

2's complement binary, C3 4-digit binary coded decimal, C1 signed-magnitude binary, C2

data table usage, P2

default configuration, block transfer write,

31, 48

diagnostic bits, 71

diagnostics, word 1, 72

factory setting, inputs, 23

fault indicator, 71

features, 11

field wiring arm, 21, 212

filtering, description, 44

format, data, 43

indicator lights, 212

indicators, 71

diagnostic, 212, 71 fault, 71 RUN, 71

input range selection, 52

input ranges, program selectable, 12

input voltage/current ranges, 42

keying, 22

band positions, 23

module configuraion, 21

I–2

Index

module location, in I/O chassis, 22

noise interference, 22, 23

potentiometers, 62

power requirements, from backplane, 22

programming, with multiple GETs, D1

range selection

bit settings, 42 input, 52

real time sampling, 45

bit settings, 45

Rockwell Automation 1771-IFE, D17716.5.90 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Summary of Changes

Table of Contents

Index