Rockwell Automation 1771-N User Manual

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AllenĆBradley

High Resolution Isolated Analog Modules

(Cat. No. 1771ĆN Series)

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 these products 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. In no event will Rockwell Automation be responsible or liable for indirect or consequential damage resulting from the use or application of these products.

Any illustrations, charts, sample programs, and layout examples shown in this publication are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Rockwell Automation 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 Application, Installation, and Maintenance of Solid–State Control (available from your local Rockwell Automation office), describes some important differences between solid–state equipment and electromechanical devices that 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 part, without written permission of Rockwell Automation, is prohibited.

Throughout this publication, notes may be used to make you aware of safety considerations. The following annotations and their accompanying statements help you to identify a potential hazard. avoid a potential hazard, and recognize the consequences of a potential hazard.

WARNING

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

ATTENTIO

Identifies information about practices or circumstances that may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for

IMPORTAN

successful application and understanding of the product.

ATTENTION

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664–1), at altitudes up to 2000 meters without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as “open type” equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present, and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

ATTENTION

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosures. Also, see the appropriate sections in this publication, as well as the Allen–Bradley publication 1770–4.1, (“Industrial Automation Wiring and Grounding Guidelines”), for additional installation requirements pertaining to this equipment.

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packaging.

Using this Manual

Preface

Purpose of Manual

Audience

Vocabulary

Manual Organization

This manual shows you how to use your high resolution isolated analog series input/output modules with an Allen-Bradley programmable controller. It helps you install, program, calibrate, and troubleshoot your modules.

You must be able to program and operate an Allen-Bradley programmable controller (PLC) to make efficient use of your analog module. In particular, you must know how to program block transfer instructions.

We assume that you know how to do this in this manual. If you do not, refer to the appropriate PLC programming and operations manual before you attempt to program this module.

In this manual, we refer to:

• the individual module as the “module.”

• the programmable controller, as the “controller” or the

“processor.”

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

2 Installing the Module

3 Communicating with your Analog Module

4 Configuring the Module

5 Module Status and Input Data

6 Module Calibration How to calibrate your modules

7 Troubleshooting Diagnostics reported by the module

Appendix A Specifications Your module's specifications

Appendix B

Appendix C

Overview of the High Resolution Isolated Analog Series Modules

Block Transfer Read and Write Configurations for 0 out/8 in

Block Transfer Read and Write Configurations for 8 out/0 in

Descriptions of the modules, including general and hardware features

Module power requirements, keying, chassis location Wiring of module and remote termination panel

How to program your programmable controller for this module Sample programs

Hardware and software configuration Module write block format

Reading data from your module Module read block format

Description of BTR/BTW words.

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Image

Block

Chassis

Topics CoveredTitleChapter

Appendix D

Appendix E

Appendix F

Appendix G

Appendix H

Appendix I

Appendix J

Appendix K

Appendix L UL/CSA Hazardous Location

Related Products

Block Transfer Read and Write Configurations for 2 out/2 in

Block Transfer Read and Write Configurations for 2 out/6 in

Block Transfer Read and Write Configurations for 1 out/7 in

Block Transfer Read and Write Configurations for 3 out/5 in

Block Transfer Read and Write Configurations for 4 out/4 in

Block Transfer Read and Write Configurations for 6 out/2 in

Block Transfer Read and Write Configurations for 5 out/3 in

Block Transfer Read and Write Configurations for 7 out/1 in

You can install your module in any system that uses Allen-Bradley processors that support block transfer and the 1771 I/O structure.

Description of BTR/BTW words.

Product Compatibility

Contact your nearest Allen-Bradley office for more information about your programmable controllers.

These modules can only be used with 1771-A1B, A2B, A3B, A3B1, A4B or later 1771 I/O chassis and 1771-AM1, -AM2 chassis. Communication between the analog module and the processor is bidirectional. The processor block-transfers output data through the output image table to the module and block-transfers input data from the module through the input image table. The module also requires an area in the data table to store the read block and write block data. I/O image table use is an important factor in module placement and addressing selection. Refer to the table below.

Compatibility and Use of Data Table

Use of Data Table Compatibility

Catalog Number

1771ĆN Series 8 8 28 59 Yes Yes Yes B

A = Compatible with 1771ĆA1, A2, A4 chassis. B = Compatible with 1771ĆA1B, A2B, A3B, A3B1,A4B, 1771ĆAM1, ĆAM2 chassis. Yes = Compatible without restriction No = Restricted to complementary module placement

Input

Bits

Output

Bits

Read

Words

Write

Words

Addressing

1/2Ćslot 1Ćslot 2Ćslot

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You can place your analog module in any I/O module slot of the I/O chassis.

Do not put the analog module in the same module group as a digital high density module unless you are using 1 or 1/2-slot addressing. Avoid placing the analog module close to ac modules or high voltage dc modules.

Related Publications

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

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Table of Contents

Overview of the High Resolution Isolated Analog Modules

Installing the Module

Chapter 1

Chapter Objectives 1-1...................................

Module Description 1-1...................................

Features of the High Resolution Isolated Analog Series Modules 1-2...

Catalog/Channel Numbers 1-3..............................

How the High Resolution Isolated Analog Modules Communicate with

Processors 1-4......................................

Accuracy 1-4..........................................

Chapter Summary 1-4....................................

Chapter 2

Chapter Objectives 2-1...................................

Before You Install Your Analog Module 2-1.....................

Electrostatic Damage 2-1..................................

Calculate Power Requirements for the I/O Chassis 2-1.............

2-1..................................................

Determine Module Location in the I/O Chassis 2-2................

Install the Analog Module 2-2...............................

Install the Module in the Chassis and Connect the Cable 2-3.........

Connecting Wiring 2-5....................................

Connecting 4ĆWire Sensors 2-9.............................

Sourcing Input Analog Modules 2-10...........................

Making Your Own Cables 2-11...............................

Grounding the Field Devices 2-12.............................

Interpreting the Indicator Lights 2-13...........................

Chapter Summary 2-13....................................

Communicating With Your Analog Module

Chapter 3

Chapter Objectives 3-1...................................

Block Transfer Programming 3-1............................

PLCĆ2 Programming 3-2..................................

PLCĆ3 Program Example 3-2...............................

PLCĆ5 and PLCĆ5/250 Program Example 3-3....................

Module Scan Time 3-4....................................

Programming Samples 3-4.................................

Sample Ladder Diagram Ć PLCĆ3 Family Processors 3-5...........

Sample Ladder Diagram Ć PLCĆ5 Family Processors 3-6...........

Setting Up the Data Table File 3-7............................

Chapter Summary 3-8....................................

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Configuring the Module

Chapter 4

Chapter Objectives 4-1...................................

Configuring the High Resolution Isolated Analog Modules 4-1........

Default Configurations 4-2.................................

Module Level Programming Features 4-3......................

Module Configuration" Verification 4-3........................

Temperature Scale 4-3....................................

Data Format 4-3........................................

Two's Complement Binary 4-5..........................

Real Time Sampling 4-5...................................

Output Channel Programming Features 4-6.....................

Scaling 4-6............................................

Clamping 4-9..........................................

Ramping 4-10...........................................

Alarm Enable 4-10.......................................

Reset State 4-10.........................................

Reset Value 4-11........................................

Input Channel Programming Features 4-11......................

Scaling 4-11............................................

Alarms 4-11............................................

Alarm Deadband 4-12.....................................

Rate Alarm 4-13.........................................

Digital Filtering 4-13......................................

Thermocouple Type 4-14...................................

RTD Type 4-15..........................................

10 Ohm Offset 4-15.......................................

Configuration Block for a Block Transfer Write 4-15................

Block Transfer Write Configuration Data Header 4-15...............

Module Configuration Data Header 4-15....................

Bit/Word Description of Word 0 4-16.......................

Output Configuration Words 1 and 2 4-16...................

Bit/Word Description of Output Configuration Words 1 and 2 4-16..

Output Configuration Words 3 and 4 4-16...................

Bit/Word Description of Output Configuration Words 3 and 4 4-17..

Output Programming 4-17..............................

Output Configuration Words 5 through 10 4-17...............

Bit/Word Description of Output Configuration Words 5 through 10 4-18

Input Programming 4-19...............................

Bit/Word Description of Input Configuration Words 17 through 23 4-19

Chapter Summary 4-20....................................

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Module Status and Input Data

Module Calibration

Chapter 5

Chapter Objectives 5-1...................................

Reading Data from the Module 5-1...........................

Block Transfer Read Data Format 5-2.........................

Outputs Only" Block Transfer Read Data Header 5-2..............

Inputs Only" and Output/Input" Block Transfer Read Data Header 5-3.

Input Status Data 5-4.....................................

Bit/Word Description for Input Status Data Words 5-5..........

Output Status Data 5-6...................................

Bit/Word Description for Output Status Data Words 5-7.........

Chapter Summary 5-7....................................

Chapter 6

Chapter Objective 6-1....................................

Tools and Equipment 6-1..................................

Calibrating Your Module 6-2................................

Indicator Operation During Calibration 6-3......................

Manual Calibration 6-3....................................

Input Channel Calibration 6-3...............................

Output Channel Calibration 6-7..............................

Chapter Summary 6-8....................................

Troubleshooting

Specifications

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771ĆN Series Modules

Chapter 7

Chapter Objective 7-1....................................

Diagnostics Reported by the Module 7-1.......................

Troubleshooting with the Indicators 7-2........................

Status Reported by the Module 7-2...........................

Chapter Summary 7-4....................................

Appendix A

Specifications A-1.......................................

General Specifications A-1.................................

Appendix B

What This Appendix Contains B-1............................

Block Transfer Write Configuration Block for 8 Input Modules B-1.....

Block Transfer Write Bit/Word Descriptions for 8 Input Modules B-3....

Block Transfer Read Word Assignments for 8 Input Modules B-5......

Block Transfer Read Bit/Word Descriptions for 8 Input Modules B-7....

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Block Transfer Write and Block Transfer Read Configurations for 8 Output/0 Input 1771ĆN Series Modules

Block Transfer Write and Block Transfer Read Configurations for 2 Output/2 Input 1771ĆN Series Modules

Block Transfer Write and Block Transfer Read Configurations for 2 Output/6 Input 1771ĆN Series Modules

Appendix C

What This Appendix Contains C-1............................

Block Transfer Write Configuration Block for 8 Output Modules C-1....

Block Transfer Write Bit/Word Descriptions for 8 Output Modules C-3...

Block Transfer Read Word Assignments for 8 Output Modules C-5....

Block Transfer Read Bit/Word Description for 8 Output Module C-6....

Appendix D

What This Appendix Contains D-1............................

Block Transfer Write Configuration Block for the

2 Output/2 Input Modules D-1............................

Block Transfer Write Bit/Word Descriptions for

2 Output/2 Input Modules D-2............................

Block Transfer Read Word Assignments for 2 Output/2 Input Module D-5 Block Transfer Read Bit/Word Description for 2 Output/2 Input Module D-6

Appendix E

What This Appendix Contains E-1............................

Block Transfer Write Configuration Block for 2 Output/6 Input Modules E-1 Block Transfer Write Bit/Word Descriptions for

2 Output/6 Input Modules E-3............................

Block Transfer Read Word Assignments for 2 Output/6 Input Modules E-6 Block Transfer Read Bit/Word Description for

2 Output/6 Input Modules E-7............................

Block Transfer Write and Block Transfer Read Configurations for 1 Output/7 Input 1771ĆN Series Modules

Block Transfer Write and Block Transfer Read Configurations for 3 Output/5 Input 1771ĆN Series Modules

Appendix F

What This Appendix Contains F-1............................

Block Transfer Write Configuration Block for 1 Output/7 Input Modules F-1 Block Transfer Write Bit/Word Descriptions for

1 Output/7 Input Modules F-3............................

Block Transfer Read Word Assignments for 1 Output/7 Input Module F-6 Block Transfer Read Bit/Word Description for 1 Output/7 Input Module F-7

Appendix G

What This Appendix Contains G-1............................

Block Transfer Write Configuration Block for 3 Output/5 Input Modules G-1 Block Transfer Write Bit/Word Descriptions for

3 Output/5 Input Modules G-3............................

Block Transfer Read Word Assignments for 3 Output/5 Input Modules G-6 Block Transfer Read Bit/Word Descriptions for

3 Output/5 Input Modules G-7............................

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Block Transfer Write and Block Transfer Read Configurations for 4 Output/4 Input 1771ĆN Series Modules

Block Transfer Write and Block Transfer Read Configurations for 6 Output/2 Input 1771ĆN Series Modules

Block Transfer Write and Block Transfer Read Configurations for 5 Output/3 Input 1771ĆN Series Modules

Appendix H

What This Appendix Contains H-1............................

Block Transfer Write Configuration Block for 4 Output/4 Input Modules H-1 Block Transfer Write Bit/Word Descriptions for

4 Output/4 Input Modules H-3............................

Block Transfer Read Word Assignments for 4 Output/4 Input Modules H-6 Block Transfer Read Bit/Word Descriptions for

4 Output/4 Input Modules H-7............................

Appendix I

What This Appendix Contains I-1............................

Block Transfer Write Configuration Block for 6 Output/2 Input Modules I-1 Block Transfer Write Bit/Word Descriptions for

6 Output/2 Input Modules I-3............................

Block Transfer Read Word Assignments for 6 Output/2 Input Modules I-6 Block Transfer Read Bit/Word Descriptions for

6 Output/2 Input Modules I-8............................

Appendix J

What This Appendix Contains J-1............................

Block Transfer Write Configuration Block for

5 Output/3 Input Modules J-1............................

Block Transfer Write Bit/Word Descriptions for

5 Output/3 Input Modules J-3............................

Block Transfer Read Word Assignments for the

5 Output/3 Input Modules J-6............................

Block Transfer Read Bit/Word Descriptions for

5 Output/3 Input Modules J-7............................

Block Transfer Write and Block Transfer Read Configurations for 7 Output/1 Input 1771ĆN Series Modules

CSA Hazardous Location

Appendix K

What This Appendix Contains K-1............................

Block Transfer Write Configuration Block for 7 Output/1 Input Modules K-1 Block Transfer Write Bit/Word Descriptions for

7 Output/1 Input Modules K-3............................

Block Transfer Read Word Assignments for 7 Output/1 Input Modules K-6 Block Transfer Read Bit/Word Descriptions for

7 Output/1 Input Modules K-7............................

Appendix L

CSA Hazardous Location L-1...............................

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Overview of the High

Resolution Isolated Analog Modules

Chapter 1

Chapter Objectives

Module Description

This chapter gives you information on:

• features of the input/output modules

• how the modules communicate with programmable controllers

The high resolution isolated analog modules are intelligent block transfer modules that interface analog signals with Allen-Bradley PLC-3 and PLC-5 family 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 and output data from the processor data table to module memory.

The N-series family includes modules with both analog inputs and outputs on the same module. The modules use 16-bit analog-to-digital converters and 14-bit digital-to-analog converters for high resolution and accuracy. All of these modules require only a single slot in the I/O chassis, and do not require an external power supply.

Since the N-series modules are combination modules, with input and output capabilities on the same module, block transfer reads from the module are structured differently from dedicated input or output modules. Normally, block transfer read information is contiguous, and is stored in contiguous locations in the data block. N-series modules transmit channel data on an individual basis with status information in between. This results in non-contiguous blocks of data in non-contiguous data locations. Care must be taken when transferring this information. Additional programming may be required.

Use with PLC-2 family programmable

IMPORTAN

Input data is converted to a specified data type in a digital format to be transferred to the processor’s data table on request. Output data is converted to analog signals and sent to the appropriate output channels. If real time sampling is selected, block transfer reads will only occur at the time selected. Consequently, the minimum interval between block transfer reads is the same as the total input update time for each analog input module (25ms).

controllers is not recommended. Refer to chapter 3, page 3-2.

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1–2 Overview of the High Resolution Isolated Analog Modules

The modules have either four or eight channels, each electrically isolated from each other and from the backplane. Input and output terminations are made through prefabricated cables which connect to remote termination panels (RTP). The modules are compatible with all 1771-A1B, A2B, A3B, A3B1, A4B, and later 1771 universal I/O chassis. In addition, they can be used in 1771-AM1, and -AM2 chassis.

Features of the High Resolution Isolated Analog Series Modules

The analog modules are comprised of modular analog signal conditioning blocks that are plugged into a common circuit board.

These signal conditioning blocks provide the following:

• 4–20mA output range

• 0–50mA output range

• +10V output (scalable +5V, 0-5V, 0-10V, etc.)

• thermocouple input (+100mV)

• +5V input (+20mA with resistor RTP)

• +10V input (+20mA with resistor RTP)

• 4–20mA input with sourcing/sinking input

• 1–650 ohm RTD input

Your particular module may have a combination of the above conditioning blocks.

The N-Series analog modules feature:

• scaling of data to engineering units

• self-calibration (external reference required)

• software configuration

• user-selectable high and low alarms with deadband (hysteresis)

• self diagnostics

• input open circuit detection

• programmable ramped outputs

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Specific analog modules have these additional features:

• Thermocouple input channels

– input channels configurable for thermocouple input ranges —

Types B, E, J, K, R, S and T thermocouples (1771-NT2 also includes types C and N)

– cold junction compensation – scaling to selected temperature range in

C or oF

– temperature resolution —

up to 0.03 up to 0.1 up to 0.07

C/0.06°F (E, J, K, T, N)

C/0.2°F (B, R, S)

C/0.1°F (C)

– millivolt resolution up to 1 microvolt

1–3Overview of the High Resolution Isolated Analog Modules

• RTD input channels

– reports

10Ω copper sensors

C, oF, or ohms for 100Ω platinum, 120Ω nickel, or

– reports ohms for other types of sensors

– 0.1

C/0.1oF resolution on 100Ω platinum sensor

– resistance resolution to 10mΩ

• +5V and +10V input channels — can be used with remote

termination panel

resistor to achieve a nonsourcing current input

• 4-20mA input with internal loop power supply

• ±10V output channels

• 0-25mA output channels

• 0-50mA output channels

Catalog/Channel Numbers

The following are standard catalog numbers and their respective channel configurations:

Module Channel 1 Channel 2 Channel 3 Channel 4 Channel 5 Channel 6 Channel 7 Channel 8

1771ĆNIS 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA B

1771ĆNIV +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) B

1771ĆNIV1 +10V +10V +10V +10V +10V +10V +10V +10V B

1771ĆNIVR +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) RTD RTD RTD RTD B

1771ĆNIVT +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +100mV/TC +100mV/TC +100mV/TC +100mV/TC B

1771ĆNR RTD RTD RTD RTD RTD RTD RTD RTD B

1771ĆNT1 +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC B

1771ĆNT2 -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC -5/+55mV/TC B

1771ĆNOC 0-25mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out C

1771ĆNOV +10V out +10V out +10V out +10V out +10V out +10V out +10V out +10V out C

1771ĆNB4T 0-25mA out 0-25mA out +100mV/TC +100mV/TC D

1771ĆNB4S 0-25mA out 0-25mA out 4-20mA 4-20mA D

1771ĆNBSC 0-25mA out 0-25mA out 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA 4-20mA E

1771ĆNBRC 0-25mA out 0-25mA out RTD RTD RTD RTD RTD RTD E

1771ĆNBTC 0-25mA out 0-25mA out +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC +100mV/TC E

1771ĆNBV1 +10V out +10V out +10V in +10V in +10V in +10V in +10V in +10V in E

1771ĆNBVC 0-25mA out 0-25mA out +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) +5V (+20mA) E

1771ĆNX1 0-50mA out 0-25mA out 0-50mA out 0-25mA out 0-25mA out RTD RTD 100mV/TC F

1771ĆNX2 0-50mA out 0-25mA out 0-50mA out 0-25mA out RTD RTD 100mV/TC 100mV/TC G

1771ĆNX3 0-50mA out 0-25mA out 0-50mA out 0-25mA out RTD RTD RTD 100mV/TC G

1771ĆNX4 0-50mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out 0-25mA out RTD 100mV/TC H

Note: Appendices I thru L cover other variations of the 1771ĆN series module.

Refer to

Appendix

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1–4 Overview of the High Resolution Isolated Analog Modules

How the High Resolution Isolated Analog Modules Communicate with Processors

The processor transfers data to and from the module using BTW (block transfer write) and BTR (block transfer read) 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 NO TAG).

1. The processor transfers your configuration data, output data and calibration values to the module using a block transfer write instruction.

2. External input devices generate analog signals that are transmitted to the module. Internal output circuitry generates analog signals that drive field devices.

3. The module converts the analog signals into binary or BCD format and stores theses values until the processor requests their transfer.

Table 1.A Communication Between the Processor and the Module

Accuracy

Memory User Program

PLC Processor (PLCĆ5/40 Shown)

BTW

BTR

High Resolution Isolated Analog Module

From input devices

To output devices

12933ĆI

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.

See chapter 4, “Configuring the Module,” for more information.

The accuracy of each of the high resolution isolated analog modules is described in Appendix A.

Chapter Summary

Publication 1771ĆUM127B-EN-P - December 2002

In this chapter you read about the functional aspects of the analog modules and how they communicate with programmable controllers.

Installing the Module

Chapter 2

Chapter Objectives

Before You Install Your Analog Module

This chapter gives you information on:

For information on See page

Before You Install Your Module . ......................

Determining Power Requirements . ................... 2-1

Determining Module Location in the Chassis . ............ 2-2

Installing the Module . ............................. 2-2

Connecting Wiring . ............................... 2-5

Connecting 4-wire sensors . ........................ 2-9

Sourcing input Analog Modules . ..................... 2-10

Making Your Own Cables . .......................... 2-11

Grounding Field Devices . .......................... 2-12

Module Indicators . .................

Before installing your module in the I/O chassis you must:

Action required: Refer to:

Calculate power requirements for the I/O chassis. page 2-1

Determine module location in the I/O Chassis page 2-2

Connect the cable and make wiring connections to the remote termination panel

page 2-3

2-1

2-13

Electrostatic Damage

Calculate Power Requirements for the I/O Chassis

ATTENTION

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential

static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component

boards.

• Do not touch circuit components inside the

equipment.

• If available, use a static–safe workstation.

• When not in use, keep modules in appropriate

static–safe packaging.

Your module receives its power through the 1771 I/O chassis backplane from the chassis power supply. The maximum current drawn by the module from this supply ranges from 1.5 to 3.3A, dependent upon the particular type of module. Refer to the specifications in appendix A for standard modules.

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2–2 Installing the Module

Add this value to the requirements of all other modules in the I/O chassis to prevent overloading the chassis backplane and/or backplane power supply.

Determine Module Location in the I/O Chassis

Install the Analog Module

Place your module in any slot of the I/O chassis except for the extreme left slot. This slot is reserved for processors or adapter

modules.

Group your modules to minimize adverse affects from radiated electrical noise and heat. We recommend the following.

• Group analog 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.

To install your module in an I/O chassis:

1. First, turn off power to the I/O chassis:

ATTENTIO

Remove power from the 1771 I/O chassis backplane and disconnect the cable from the module before removing or installing an I/O module.

• Failure to remove power from the backplane

could cause injury or equipment damage due to

possible unexpected operation.

• Failure to remove power from the backplane

could cause module damage, degradation of performance, or injury.

Publication 1771ĆUM127B-EN-P - December 2002

ATTENTIO

Observe the following precautions when inserting or removing keys:

• insert or remove keys with your fingers

• make sure that key placement is correct

Incorrect keying or the use of a tool can result in damage to the backplane connector and possible system faults.

Key the Backplane Connector

Place your module in any slot in the chassis except the leftmost slot which is reserved for processors or adapters.

Position the keying bands in the backplane connectors to correspond to the key slots on the module.

Place the keying bands:

between 26 and 28 between 32 and 34

You can change the position of these bands if subsequent system design and rewiring makes insertion of a different type of module necessary.

2–3Installing the Module

I/O chassis

Keying Bands

Install the Module in the Chassis and Connect the Cable

ATTENTIO

Upper Connector

Remove power from the 1771 I/O chassis backplane and field wiring arm before removing or installing an I/O module.

11022ĆI

• Failure to remove power from the backplane or

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

• Failure to remove power from the backplane

could cause injury or equipment damage due to possible unexpected operation.

1. Place the module in the plastic tracks on the top and bottom of the slot that guides the module into position.

2. Do not force the module into its backplane connector. Apply firm even pressure on the module until it is firmly seated in the chassis. Note: The chassis locking bar will not close if all modules are not seated properly.

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2–4 Installing the Module

1771ĆA1B, ĆA2B, ĆA3B, ĆA3B1, ĆA4B I/O chassis

locking tab

card guides

module

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

3. Connect the 1771-NC cable to the module as shown in Figure 2.1. A. Slide the locking bar up.

B. Insert the cable connector into the mating connector on the

1771ĆA1B, ĆA2B, ĆA3B1, ĆA4B Series B I/O chassis

locking bar pin

Swing the chassis locking bar down into place to secure the modules. Make sure the locking pins engage.

front of the module.

locking bar

card guides

module

19809

Module Connector

1. Position locking bar in up position.

Cable Connector

Locking bar

C. Slide the locking bar down over the mating pins on the

module to lock the connector onto the module.

Figure 2.1 Connecting the Cable to the Front of the Module

2. Insert connector into mating connector.

3. Slide locking bar down to lock.

11023ĆI

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2–5Installing the Module

Connecting Wiring

The N-series modules are cable-connected to a remote termination panel using cat. no. 1771-NC6 (6 ft) or -NC15 (15 ft) cables.

Variations of remote termination panels are used, depending on the type of module used. These are:

Catalog

Number

1771ĆRTP1 has cold junction compensation for thermocouples

1771ĆRTP3 incorporates resistors and fuses; used primarily for 4Ć20mA inputs

when using + such as Bussmann GMA-1/4, 250V/250mA.)

1771ĆRTP4 a generalĆuse block with straightĆthru wiring that can be used for all

applications except thermocouples

1771ĆRT41 a 4Ćchannel block with cold junction compensation for thermocouples

1771ĆRT44 a generalĆuse 4Ćchannel block with straightĆthru wiring that can be

used for all applications except thermocouples

RTP4 and RT44 can be used withthermocouples if a method of cold junction compensation is provided at

the interface of thermocouple and copper wires within the system.

5V inputs (Uses 5mm x 20mm fast acting 1/4A fuses

Description

The remote termination panels are designed for mounting on standard DIN 1 or DIN 3 mounting rails.

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2–6 Installing the Module

3.0 (75.0)

Figure 2.2 Mounting Dimensions for the Remote Termination Panels

RTP1, RTP3, RTP4

Inches (Millimeters)

2.3 (58.4)

3.0 (75.0 )

J8 J7 J6

J1 J2 J3 J4

5.30 (134.6)

RT41, RT44

J1 J2 J3

2.3 (58.4)

Dimensions to

3.5 (88.9)

back of DIN rail

19366

Table 2.A Remote Termination Panel Connection Points for Field Devices (Channel 1 shown)

Input Type Connect To Input Type Connect To Input Type Connect To Input Type Connect To

Voltage

Output

Type

Voltage

+ I1

Shield S1

Connect To

Current

(with external resistor)

Output

Type

+ O1 + O1

Current

+ I1 + I1 + I1

Ć R1

Shield S1 Shield S1

Connect To Input Type Connect To

Thermocouple

Ć R1

Current

(Source/

Sink)

Shield S1

Power

Excitation (A) O1

Ć R1

RTD

Lead Compensation (B) I1

Shield S1 Shield S1 Common (C) R1

When using 4Ćwire RTD, leave the 4th wire open.

Not used when NĆSeries module is supplying loop power. Refer to Figure 2.6 in this document.

Publication 1771ĆUM127B-EN-P - December 2002

Loop

Figure 2.3 Remote Termination Panel Wiring

2–7Installing the Module

Module End of 1771ĆNC cable

Example:

Channel 1 Connections R1 = Return 1 I1 = Input 1 O1 = Output 1 S1 = Shield 1

RTP End of 1771ĆNC cable

Channel 1 Connections R1 = Return 1 I1 = Input 1 O1 = Output 1 S1 = Shield 1

Note: Terminals W1, W2 and W3 are spares. Do not use terminals CR and CL.

RTP1

DIN Rail

Note: Terminals W1, W2 and W3 are spares. Do not use terminals CR and CL.

Module End of 1771ĆNC cable

RT41

RTP End of 1771ĆNC cable

DIN Rail

11024ĆI

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2–8 Installing the Module

Field wiring to the remote termination panel is the same for all remote termination panel variations. Refer to Figure 2.4.

Each channel has 4 connections: R, I, O, and S.

• R = return

• I = input

• O = output

• S = shield

Channel 1 would use R1, I1, O1, and S1; channel 2 would use R2, I2, O2, and S2; and so on for the remaining channels.

To connect field wiring to the remote termination panel:

1. Strip 3/8 inch (9.25 mm) of insulation from the 22-12 AWG wire.

2. Insert the wire into the open connector slot.

3. Tighten the screw to 4.4–5.2 lb–in. (0.5–0.6Nm) to clamp the

wire.

Figure 2.4 Connecting Wire to the Remote Termination Panel

Each channel has four connections: R, I, O, and S. Field wiring to the RTP is the same for all RTP variations. Channel 1 uses R1, I1, O1, and S1; channel 2 uses R2, I2, O2, and S2; and so on for the remaining channels.

Remote Termination Panel (RTP)

I = input

R = return

Field Wiring

O = output

S = shield

Publication 1771ĆUM127B-EN-P - December 2002

channel 2

channel 1

19621

2–9Installing the Module

Connecting 4ĆWire Sensors

Figure 2.5 shows how to connect 4-wire sensors to the remote termination panel. A 4-wire sensor has two pairs of leads; one pair for each resistor junction. One wire of the four is not used (it does not matter which one). This leaves three wires – one pair and one single wire. You must connect the single wire to the terminal marked “O_”. You connect the remaining pair of wires to terminals “I_” and “R_”. It doesn’t matter which wire of the pair connects to terminal “I_” and which wire connects to terminal “R_” so long as all three wires are the same AWG gauge.

Figure 2.5 Connecting a 4ĆWire Sensor to the Remote Termination Panel

Single lead connects to terminal O

Note: In this illustration:

Terminal O is the 1mA excitation (A) sourcing current Terminal I is the lead compensation (B) sense input Terminal R is common (C)

Chassis Ground

RTD

Leave 1 lead open

12935-I

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2–10 Installing the Module

Sourcing Input Analog Modules

The 1771-NIS, 1771-NBSC and 1771-NB4S modules are sourcing/sinking input modules. These modules can supply the necessary loop power for 2-wire transmitters connected to the input. All loop power functionality is contained within the analog module. Examples of typical configurations are shown in Figure 2.6. No external resistors are required.

Figure 2.6 Examples of Sourcing/Sinking Input Modules

2ĆWire Transmitter

4ĆWire Transmitter

RTP4

Output

Input

Return

Output

24V dc

Input

Module supplies loop power

(sourcing)

24V dc

2ĆWire Transmitter

24V dc

Input

Return

Output

Input

Return

24V dc

Input

User supplies loop power with 4Ćwire transmitter

(sinking)

User supplies loop power

(sinking)

Inputs can be configured as sourcing or sinking inputs. For sourcing inputs, the N-series module supplies the loop power. For sinking inputs, you supply the loop power.

When the loop power is supplied externally, the 16-bit resolution provides 65535 counts over the 0–20mA current range. This provides about twice the resolution of voltage inputs with external resistors.

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2–11Installing the Module

Thermistor

Making Your Own Cables

Module Top Connector Module Bottom Connector

Channel Number Signal 37ĆPin Connector Wire Color Channel Number Signal 37ĆPin Connector Wire Color

I1 20 Blk I5 20 Blk

R1 21 Wht/Blk R5 21 Wht/Blk

I2 24 Orn I6 24 Orn

R2 25 Wht R6 25 Wht

I3 29 Grn I7 29 Grn

R3 30 Grn/Wht R7 30 Grn/Wht

If you are not using thermocouples, you can terminate the analog module to a terminal block by cutting the 25-pin RTP end connector off the standard cable and wiring to your terminal block. Refer to Table 2.B for wire termination designations.

Table 2.B Wire Termination Designations

22 Blk/Wht

26 Orn/Blk

31 Grn/Blk

O5 22 Blk/Wht

O6 26 Orn/Blk

O7 31 Grn/Blk

I4 33 Blu I8 33 Blu

R4 34 Blu/Wht R8 34 Blu/Wht

35 Blu/Blk

Cold Junction

O8 35 Blu/Blk

36 Red

37 Red/Wht

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2–12 Installing the Module

Grounding the Field Devices

When using shielded cable or shielded thermocouple extension 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 the “S” connection on the RTP for the particular channel. All shield connections are internally connected together in the RTP so that only one wire is required to ground the entire remote termination panel. Connect a wire from the “SH” connection on the RTP to a ground stud on the metal cabinet in which the remote termination panel is mounted.

If you do not want to ground a particular shield at the RTP, you can remove the jumper for that particular channel. This will allow the shield to float at the RTP end. To remove a jumper, you must cut it out. Once the jumper is removed it cannot be replaced. Clip as close to the circuit board as possible at both ends to completely remove it. The jumpers (Figure 2.7) are labeled J1 through J8, corresponding to channels 1 through 8 respectively.

Figure 2.7 Jumper Positions

Jumpers for channels

5 through 8

J7 J6 J5

J2 J3 J4

Jumpers for channels

1 through 4

Refer to publication 1770-4.1, Programmable Controller Wiring and Grounding Guidelines, for additional information.

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2–13Installing the Module

Interpreting the Indicator Lights

The front panel of the analog module contains two bi-color indicators: a red/green RUN/FLT (fault) indicator and a red/green CAL/COM indicator (Figure 2.8).

Figure 2.8 Diagnostic Indicators

Run/Fault indicator. This indicator will flash green until the first valid block transfer write has been

RUN/FLT

CAL/COM

received. If a fault is found initially or occurs later, the RUN/FLT indicator turns red.

Calibrate/communication indicator. This indicator will flash green when doing block transfers. It will flash red during calibration.

10528ĆI

At power-up, an initial module self-check occurs. The RUN/FLT indicator will be green when the check is completed satisfactorily. It will flash green until the first valid block transfer write has been received. If a fault is found initially or occurs later, the RUN/FLT indicator turns red.

Chapter Summary

The bottom indicator is the calibrate/communication indicator. This indicator will flash green when doing block transfers. It will flash red during calibration.

Possible module fault causes and corrective action are discussed in Chapter 7, “Troubleshooting.”

In this chapter you learned how to install your module in an existing programmable controller system and how to wire to the remote termination panel.

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2–14 Installing the Module

Publication 1771ĆUM127B-EN-P - December 2002

Chapter 3

Communicating With Your Analog Module

Chapter Objectives

Block Transfer Programming

configure the module

send data to the output channels of those modules having outputs

In this chapter, we describe

• block transfer programming

• quick-startup sample programs for the PLC-3 and PLC-5

processors

• module scan time issues

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

For the 1771-N series modules, block transfer writes (BTWs) can perform two different functions.

If you want to: Description This type of BTW is called:

This involves setting the bits which enable the programmable features of the module, such as scaling, alarming, real time sampling, etc.

This type of BTW is generally shorter in length than the configuring BTW because it does not configure the module each time it is initiated.

the configuration BTW”

the output update BTW"

A configuration BTW is initiated when the analog module is first powered up, and subsequently only when the programmer wants to enable or disable features of the module.

An output update BTW is initiated when the programmer wants the output channels on the module to change value. This shortened version of the BTW allows faster response time from the output channels.

The following example programs are minimum programs; all rungs and conditioning must be included in your application program. You can disable BTRs, or add interlocks to prevent writes if desired. Do not eliminate any storage bits or interlocks included in the sample programs. If interlocks are removed, the program may not work properly.

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3–2 Communicating With Your Analog Module

Your analog module works with a default configuration upon powerup as long as a block transfer write (BTW) has not been initiated. See the configuration default section in chapter 4 to understand what this configuration looks like. Refer to the sample programs in this chapter to get started.

Your program should monitor status bits (such as overrange, underrange, alarms, etc.) and block transfer read activity.

The following example programs illustrate the minimum programming required for the 1771-N series module to powerup and operate.

PLCĆ2 Programming

PLCĆ3 Program Example

Due to the number of digits required for high resolution readings, the 1771-N series modules normally read input values in 2’s complement binary. Binary coded decimal (BCD) can be used, but with lower resolution. As a result, the 1771-N series modules are not recommended for use with PLC-2 family programmable controllers.

Block transfer instructions with the PLC-3 processor use three data table files. A binary file is used for module location and other related data. This is the block transfer control file. Two separate block transfer data files store data that you want transferred to the module (when programming a block transfer write) or from the 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.

An example program segment with block transfer instructions is shown in Figure 3.1, and described below.

Publication 1771ĆUM127B-EN-P - December 2002

Figure 3.1 PLCĆ3 Family Sample Program Structure

3–3Communicating With Your Analog Module

Program Action

At powerup, the user program enables a block transfer read. Then it initiates a block transfer write to configure module.

Thereafter, the program continuouslyperĆ forms read and write block transfers.

PLCĆ5 and PLCĆ5/250 Program Example

BTR BLOCK XFER READ

Block Transfer

Read Done Bit

Block Transfer

Write Done Bit

RACK: GROUP: MODULE: DATA: LENGTH: CNTL:

BTW BLOCK XFER WRITE RACK: GROUP: MODULE: DATA: LENGTH: CNTL:

X = XXXX

XXXX:XXXX

X = XXXX

XXXX:XXXX

XXX

Enable EN

Done

Error

Enable

Done

Error

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

• Block transfer enable bits are used instead of done bits as the

conditions on each rung.

• Separate block transfer control files are used for the block

transfer instructions.

Program Action

At powerup, the user program enables a block transferread. Thenit initiatesa block transfer write to configure module.

Thereafter, the program continuously perĆ forms read and write block transfers.

Figure 3.2 PLCĆ5 Family Sample Program Structure

BTR Enable

BTR

Enable

BTW Enable

BTW Enabl e

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

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

XXX:XX XXX:XX

X X

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3–4 Communicating With Your Analog Module

Module Scan Time

Scan time is defined as the amount of time it takes for the module to read the input channels and place new data into the data buffer and/or read the data buffer and write new data to the output channels. Scan time for your module is shown in Figure 3.3.

Figure 3.3 Block Transfer Time

End of Block Transfer Write

Block Transfer Write Time

1 2 3 456

Internal scan time = 25ms

Configure Time

Module available to perform block transfer

1st Scan 2nd Scan 3rd Scan

The following description references the sequence numbers in Figure 3.3.

Following a block transfer write (1) the module inhibits communication until after it has configured the data and loaded calibration constants (2), scanned the inputs and/or outputs (3), and filled the data buffer (4). Configuration block transfers, therefore, should only be performed when the module is being configured or calibrated.

10529ĆI

Programming Samples

Any time after the buffer is filled (4), a block transfer read (BTR) request can be acknowledged.

When operated in the default mode, new data will be available for a BTR every 25 milliseconds. When operated in real time sample mode (RTS = T), BTRs will be ignored by the module for “T” milliseconds, at which time a single BTR will be allowed.

The following are sample programs for using your modules more efficiently when operating with the PLC-3 or PLC-5 family processors.

These programs show you how to configure the module and read data from the module, and efficiently update the output channels on those modules with outputs.

Refer to the proper PLC-3 or PLC-5 documentation for additional information on processor programming and data entry.

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3–5Communicating With Your Analog Module

The differences between the types of 1771-N series modules is related to the number of output channels each module has. A module with only inputs (no outputs) requires one BTW after powerup. Thereafter, it sends back input data and module status by way of BTRs.

A module with outputs requires BTWs to configure it and update its output data. BTRs are required to send back input data and module status.

Sample Ladder Diagram Ć PLCĆ3 Family Processors

The following PLC-3 program can be used for all 1771-N series modules. The program can be altered to effectively address modules with or without output channels.

Figure 3.4 PLCĆ3 Family Example Program Structure

Rung 1

Rung 2

Rung 3

Rung 4

BTR

BLOCK XFER READ RACK: GROUP: MODULE: CONTROL: DATA FILE LENGTH:

MOV SOURCE:

DESTINATION:

MOV SOURCE:

DESTINATION:

BTW BLOCK XFER WRITE

RACK: GROUP: MODULE: CONTROL: DATA FILE LENGTH:

0 0 0

#B1:10

#N1:0

0000000000111011

0000000000001001

0 0 0

#B1:10

#N1:100

Block Transfer Read Error Bit

B1:10

Pushbutton

I0:2

Power-up Bit

N1:1

Pushbutton

I0:2

Block Transfer Write Error Bit

B1:10

Block Transfer Read Done Bit

B1:10

Block Transfer Write Done Bit

Power-up Bit

N1:1

Block Transfer

Write Done Bit

B1:10

Block Transfer Write Done Bit

B1:10

This program changes the length of the block transfer write from 59 words at powerup or when reconfigured, to 9 words at all other times.

Enable

Done

B1:0

B1:15

B1:1

B1:15

Enable

Done

Error

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3–6 Communicating With Your Analog Module

Modules without output channels do not require rungs 2 and 3. Instead, move the input condition instructions from rung 2 to the front of rung 4, and specify the BTW length equal to 59.

Sample Ladder Diagram Ć PLCĆ5 Family Processors

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

• You use enable bits instead of done bits as the conditions on each

rung.

• A separate control file must be selected for each of the block

transfer instructions.

Figure 3.5 PLCĆ5 Family Example Program Structure

For the following example, assume the analog module is physically located at rack address 01, module group 00, module sl and the input module connected to the pushbutton is located at rack address 00, module group 7, slot 6. The block transfer data files correspond to the example on the following pages.

BTR Enable

N10:0 N10:5

Pushbutton

I:007 N10:5

00 15

Powerup Bit

N10:11

Pushbutton

I:007 N10:5

00 15

BTR Enable

N10:0 N10:5

15 15

BTW Enable

Powerup Bit

N10:11

* Length = (number of outputs + 1) words.

For 2 output/6 input modules, this would be equal to 3.

Modules without output channels do not require rungs 2 and 3. Instead, move the input condition instructions (pushbutton and powerup) from rung 2 to the front of rung 4, and specify the BTW length equal to 59.

BTR BLOCK XFER READ RACK:

BTW Enable

GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

CPT

COMPUTE DEST EXPRESSION

CPT

COMPUTE DEST EXPRESSION

BTW

BLOCK XFER WRITE RACK: GROUP: MODULE: CONTROL: DATA FILE: LENGTH: CONTINUOUS:

N10:10

N10:80

N10:0

N10:6

N10:5

01 00

* N

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3–7Communicating With Your Analog Module

Setting Up the Data Table File

Channel 1 400/2000 0/0 1.6 Minimum Ye s N/A

Channel 2 Ć1000/1000 Ć900/900 8.0 User Ye s 100

Channel 3 0/0 25000/26000 17 Ye s 20.0 0.5 N/A N/A B

Scale Value

Low/High

(counts)

Scale Value

Low/High

(counts)

If you use a 1771-NBTC module with the parameters listed below, the PLC-5 data table file screen on an industrial terminal screen would look similar to Figure 3.6.

Overall Module Functions Chosen

Number of outputs: 2

Verify mode: Disabled

Temperature Scale: Fahrenheit

BCD Select Bit: 2's complement binary data format

Cold Junction Temperature Alarm: Enabled

Real Time Sampling Rate: 200 milliseconds

Clamp Value

Low/High

(counts)

Alarm Value

Low/High

(counts)

Max Output

Ramp Rate

(mA/sec)

Input Rate

Alarm

F/sec)

(

Reset State

Alarm

Enable

Alarm

Enable

Alarm

Deadband

(

Reset Value

(mA)

Filter Time (sec)

10 Ohm

Offset

RTD

TypeTCType

Channel 4 0/0 10000/10500 1.7 Yes 10.0 1.0 N/A N/A E

Channel 5 0/0 20000/20500 1.7 Yes 10.0 1.5 N/A N/A J

Channel 6 0/0 10000/10500 1.7 Yes 10.0 2.0 N/A N/A K

Channel 7 0/0 20000/21000 N/A Ye s 20.0 2.5 N/A N/A R

Channel 8 0/0 30000/31000 N/A Ye s 20.0 3.0 N/A N/A S

The above configuration for the 2 output/6 input module (cat. no. 1771-NBTC) would be set up using the following PLC-5 data table file (Figure 3.6).

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3–8 Communicating With Your Analog Module

Figure 3.6 Sample PLCĆ5 Data File (Hexadecimal Data) for a 2 Output/6 Input Module

Address

N10:0 N10:10 N10:20

N10:30 N10:40 N10:50

N10:60

N10:70 N10:80 N10:90 N10:100 N10:110 N10:120 N10:130

C684 8800 8010

0062 0000 0000

0000 0000 8820

0000 6590 2000

2710

19C8

0000 2000

0C71

0062 0000 0000

0000 0000

04B0

FC18 80AA

0000

2904 5000

Press a function key or enter a value.

N10:25 =

Rem Prog Forces: None

001C

000A

8000

02EC

8010

0EA4

0005

0000

8002

03E8

FC7C

05C8

1000

0000

4E20

1464

801

0000

Data: Hex/BCD Addr: Decimal 5/25 Addr 11 APL_NBTC

000A

6404

0000

39A9

8010

1288

0005

0000

00C8

0190

0384

E032

0000

5014

8011

0000

4000

7918

7530

003B

0000

39C1

0000

4045

8010

0005

0000

07D0

0000

0064

2904

2710

3000

0E64

0000

4E20

8000

1DC8

000A

642C

8000

44E6

8010

0000 0000 0000

0000 0000

A00A

0000

61A8

0000

0A64

8011

0000

5208

8000

6000

0000

0050

0000 0000 0000

0000 0000

Chapter Summary

Change Radix F1

Specify Address F5

The block transfer read data file is located at N10:10 thru N10:37. The block transfer write data file is located at N10:80 thru N10:138.

In this chapter, you learned how to program your programmable controller. You were given sample programs for your PLC-3 and PLC-5 family processors, and shown what the data file for a module looks like.

You also read about module scan time.

Next File F7

Prev File F8

Publication 1771ĆUM127B-EN-P - December 2002

Chapter 4

Configuring the Module

Chapter Objectives

Configuring the High Resolution Isolated Analog Modules

In this chapter you will read how to:

• configure your module’s features

• condition your inputs and outputs 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.

Configure your module for its intended operation by means of your programming terminal and write block transfers.

Note: Programmable controllers that use 6200 software (release 4.2 or higher) programming tools can take advantage of the IOCONFIG Addendum utility to configure this module. IOCONFIG Addendum uses menu-based screens for configuration without having to set individual bits in particular locations. You must have block

transfer read and block transfer write rungs in your program before using IOCONFIG software. Refer to your 6200 software

literature for details.

Important: It is strongly recommended that you use IOCONFIG to

configure this module. The IOCONFIG utility greatly simplifies configuration. If the IOCONFIG is not available, you must enter data directly into the data table. Use this chapter as a reference when performing this task.

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.

During normal operation, the processor transfers from 1 to 59 words to the module when you program a BTW instruction to the module’s address. The BTW file contains configuration words, high and low channel alarm settings, and calibration values that you enter for each channel.

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4–2 Configuring the Module

When making entries in the configuration block, use binary or hexadecimal only.

Default Configurations

The modules can be operated in a default mode by using zeroes in all but the first word of the BTW data file. The first word must identify the number of outputs on the module. For example, the first word for the 8 output module (cat. no. 1771-NOC) would be 8880 hexadecimal; the first word for the 2 out/6 input module (cat. no. 1771-NBVC, -NBTC, -NBRC) would be 8820 hexadecimal; and the first word for the 8 input module (cat. no. 1771-NIV, -NT1, -NR) would be 8800 hexadecimal.

First Word in BTW file

8880 hexadecimal 8

8870 hexadecimal 7

8860 hexadecimal 6

8850 hexadecimal 5

8840 hexadecimal 4

8830 hexadecimal 3

8820 hexadecimal 2

8810 hexadecimal 1

8800 hexadecimal 0

Number of

Outputs

The default scaling values that apply to the inputs and outputs are listed in the specifications in appendix A. In default mode, all programmable features (alarming, filtering, real time sampling, etc.) are disabled.

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4–3Configuring the Module

Module Level Programming Features

Module level programming features include:

• module “configuration” verification

• temperature scale

• data format

• real time sample

Module Configuration" Verification

The verify bit 00 in the block transfer write word 3 allows you to compare the configuration information the module is using to the configuration information contained in a block transfer write (BTW). You set the verify bit in the BTW you wish to check, and download the BTW to the module. After the BTW is completed, request a BTR from the module. The program verify field in the BTR (bits 09-10 decimal, bits bits 11-12 octal, word 1) will contain either of two values: 10 (binary) indicates the verify failed; 11 (binary) indicates the verify succeeded.

If the verify bit is set, configuration information in the BTW data file will not be used by the module regardless of the success or failure of the verify.

Temperature Scale

You select the temperature scale that the module will use when returning temperature to the processor using bit 01, word 3 of the block transfer write data file. If the bit is set to 0, the temperature is in degrees C; if the bit is set to 1, the temperature is in degrees F.

Data Format

Use bit 02, word 3 of the block transfer write data file to select a data format. If this bit is 0, all data fields will be in two’s complement binary format. If the bit is 1, all fields will be in BCD format. In BCD, the most significant bit is the sign bit for all signed fields. This sign bit applies to both BTW and BTR words.

NOTE: Available resolution is poor when using BCD format.

The 4-digit BCD format uses an arrangement of 16 binary digits to represent a 4-digit decimal number from 0000 to 9999 (Figure 4.1). The BCD format is used when the input values are to be displayed for operator viewing. Each group of four binary digits is used to represent a number from 0 to 9. The place values for each group of

digits are 2 group of four binary digits is determined by multiplying the binary digit by its corresponding place value and adding these numbers.

, 21, 22 and 23 (Table 4.A). The decimal equivalent for a

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4–4 Configuring the Module

The 1771-N series modules use 15-bit signed magnitude BCD. The maximum range value available then becomes +

Figure 4.1 4ĆDigit Binary Coded Decimal

Sign Bit Ć

0=+

1X22=4

1X2

0111100110011001

Sign Bit

1=Ć

1X2

0X2 0X2

1X2

=0 =0

1X2

0X2 0X2

1X2

7999.

1X2

0X2

1X2

12955ĆI

Table 4.A BCD Representation

(8) 22(4) 21(2) 20(1)

Place Value

0 0 0 0 0

0 0 0 1 1

0 0 1 0 2

0 0 1 1 3

0 1 0 0 4

0 1 0 1 5

0 1 1 0 6

0 1 1 1 7

1 0 0 0 8

1 0 0 1 9

Decimal

Equivalent

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4–5Configuring the Module

Two's Complement Binary

Two’s complement binary is used with PLC-3 processors when performing mathematical calculations internal to the processor. To complement a number means to change it to a negative number. For example, the following binary number is equal to decimal 22.

10110

= 22

First, the two’s complement method places an extra bit (sign bit) in the left-most position, and lets this bit determine whether the number is positive or negative. The number is positive if the sign bit is 0 and negative if the sign bit is 1. Using the complement method:

0 10110 = 22

To get the negative using the two’s complement method, you must invert each bit from right to left after the first “1” is detected.

In the above example:

0 10110 = +22

Its two’s complement would be:

1 01010 = -22

Note that in the above representation for +22, starting from the right, the first digit is a 0 so it is not inverted; the second digit is a 1 so it is not inverted. All digits after this one are inverted.

If a negative number is given in two’s complement, its complement (a positive number) is found in the same way:

1 10010 = -14 0 01110 = +14

All bits from right to left are inverted after the first “1” is detected.

The two’s complement of 0 is not found, since no first “1” is ever encountered in the number. The two’s complement of 0 then is still 0.

Real Time Sampling

Real time sampling is set using word 4 of the block transfer write data file. The real time sampling (RTS) mode of operation provides data from the module at a fixed time period for use by the processor. RTS is invaluable for time based functions (such as PID and totalization) in the processor. It allows accurate time based calculations in local or remote I/O racks.

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4–6 Configuring the Module

In the RTS mode, the module scans and updates its inputs at a user defined time interval ( 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 end of the next RTS period, a time-out bit is set in the BTR status area (word

1). 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.

Legal RTS values are in intervals of 1ms from 0.100 to 10.000 seconds in binary format, or 0.100 to 9.999 seconds in BCD format. An RTS value of 0 disables the real time sampling feature.

∆T) instead of the default interval. The

Output Channel Programming Features

Output channel programming features include:

• low and high scaling

• low and high clamping

• ramping

• alarm enable

• reset state

• reset value

Scaling

Scaling is the conversion of unscaled data to engineering units. You use scaling so that the data for each channel is represented in actual engineering units.

Each channel has two scaling points, low and high. The signal value at these points is fixed. For example, the high scaling point of a

10V output channel always corresponds to an output signal equal to

+ +10.000V.

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Channel Type Sensor Low Scaling Point High Scaling Point

5/+55mV Input

100mV Input

650 Ohm Input

10V Output Ć10.0V +10.0V

25mA Output 4mA 20mA

50mA Output 1mA 50mA

5V Input 1.0V 5.0V

10V Input Ć10.0V +10.0V

4Ć20mA Input 4mA 20mA

Millivolt Ć5mV +55mV

Temperature Ć300C/Ć508F 1800C/3272F

Millivolt Ć100mV +100mV

Temperature Ć300C/Ć508F 1800C/3272F

Resistance 1.0 Ohm 650 Ohm

Temperature Ć200C/Ć328F 900C/1652F

To implement the scaling feature, you insert the minimum and maximum scaled values in the appropriate configuration words.

4–7Configuring the Module

Scaling values can be entered in either BCD or binary format. The range of binary format scaling values is +

7999. Remember to check the data format bit for proper control.

32767; BCD format is

For example, assume that at 0mA, the device connected to this input channel is producing 0 psi, and at 20mA it produces 150 psi. Extrapolation indicates that at 4mA, the device is producing 30 psi. By setting the low scale value of the input to 30 and the high scale value to 150, this input channel will report data in psi.

For better resolution, you can multiply both of the scaling values by the same multipler as long as both scale values are in the range of

32767 binary or +7999 BCD. By setting the low scale to 3000 and

+ the high scale value to 15000, you would report data in units of 0.01 psi per count.

Maximum resolution can be obtained by setting the low scale value to -32767 (-7999 in BCD) and the high scale value to +32767 (+7999 in BCD).

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4–8 Configuring the Module

10V Output

25mA Output

50mA Output

5V Input

10V Input

4Ć20mA Input

5/+55mV Input

100mV Input

650 Ohm Input

If both the low scale and high scale values are set to 0, the module reports data in the default resolution as shown below.

Channel Type Data Format Temperature Scale Resolution

Binary N/A 0.1mV/count

BCD N/A 1mV/count

Binary N/A 0.1mA

BCD N/A 1mA

Binary N/A 0.1mA

BCD N/A 1mA

Binary N/A 0.1mV

BCD N/A 1mV

Binary N/A 0.1mV

BCD N/A 1mV

Binary N/A 0.1mA

BCD N/A 1mA

Binary Voltage Mode 0.01mV/count

BCD Voltage Mode 1mV/count

Binary Celsius Mode 0.1oC/count

BCD Celsius Mode 10oC/count

Binary Fahrenheit Mode 0.1oF/count

BCD Fahrenheit Mode 10oF/count

Binary Voltage Mode 0.01mV/count

BCD Voltage Mode 1mV/count

Binary Celsius Mode 0.1oC/count

BCD Celsius Mode 10oC/count

Binary Fahrenheit Mode 0.1oF/count

BCD Fahrenheit Mode 10oF/count

Binary Resistance Mode 0.1 Ohm/count

BCD Resistance Mode 1 Ohm/count

Binary Celsius Mode 0.1oC/count

BCD Celsius Mode 10oC/count

Binary Fahrenheit Mode 0.1oF/count

BCD Fahrenheit Mode 10oF/count

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4–9Configuring the Module

Clamping

Output channels can be configured to limit or clamp the output signal at a specified value regardless of the output data value written to the module. Low and high clamping values are written to the module in scaled units, and must be within the absolute signal limits shown below.

Output Type Low Absolute Limit High Absolute Limit

+ 10V Ć10.4V 10.4V

25mA 0mA 26mA

50mA 0mA 50mA

If either value is outside of these limits, or if the low clamp is higher than the high clamp, the bad programming status bit (bit 07 in BTR word 1) will be set.

When the clamp feature is activated (output from the programmable controller is greater than the high clamp or lower than the low clamp) a corresponding high or low clamp status bit is set in the channel status word returned in the BTR.

High Clamp Limit

Low Clamp Limit

Figure 4.2Clamped Outputs

Time

output value sent by PLC processor

clamped output value

If the PLC processor commands the output past the clamp limit, the module will not output a value outside the predetermined range.

Clamp the output so that it cannot exceed a predetermined range (high and low clamp limit).

clamp inactive

clamp active

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4–10 Configuring the Module

Ramping

Output ramping is used to limit the rate of change of an output channel. You enter the rate as a percentage (between 0 and 200%) of full scale per second, where 0 disables the ramping feature, and full scale is the difference between the low and high scaling points. 4.3 shows the effect of ramping on the output signal.

Figure 4.3Ramping on the Output Signal

Ramped OutputOutput Ramp Disabled

Voltage

Time

Actual voltage change Ramped voltage change

Time

Alarm Enable

Clamping and ramping are only active when the alarm enable bit (decimal bit 17, octal bit 15) has been set to 1.

Reset State

This field determines the action taken by the channel if the I/O reset backplane pin is asserted.

I/O Reset State Binary Value

Decimal

Last State 0 0

Minimum 0 1

Maximum 1 0

User Selectable 1 1

Octal

Bit 14

(Bit 16)

Bit 13

(Bit 15)

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The minimum and maximum values are defined as the low and high absolute limits respectively.

4–11Configuring the Module

Reset Value

If the channel is programmed to go to a user-selectable reset value upon I/O reset, the value is entered (in scaled units) into that channel’s proper configuration word. The value entered must be between the high and low absolute limits. If user-selectable resetting is not chosen, this field should be set to 0.

Input Channel Programming Features

Input channel programming includes:

• low and high scaling

• low and high alarming

• alarm deadband

• rate alarming

• alarm enable

• digital filtering

• thermocouple type

• RTD type

• 10 Ohm offset

Scaling

Scaling input channels is identical to scaling output channels. Refer to “Output Channel Programming Features” on page 4–6.

Alarms

Each input channel has five alarm functions that provide status indication through five associated status bits in the block transfer read data returned by the module.

Input alarms let the user specify a range of “good” input values. If the input value goes outside of this range, and the alarm enable bit is set, the module will set the low or high alarm bit for that channel. The alarm values are written to the module in the same units as the scaling values, and must be within the absolute signal limits specified in appendix A.

• Underrange - This bit is set if the input falls below the

minimum range for that specific input type. This alarm is predefined and cannot be changed by the user. In current loop inputs, this bit also indicates an open loop.

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4–12 Configuring the Module

• Overrange - This bit is set if the input rises above the

maximum range for that specific input type. This alarm is predefined and cannot be changed by the user. For all voltage, RTD and thermocouple inputs, this bit indicates an open channel.

Alarm Deadband

Alarm deadband allows the user to program a hysteresis effect on the alarming for a given channel. The deadband cannot be larger than 255 binary or 99 BCD, or 1/2 of the difference between the low alarm and high alarm values.

• Low Alarm With Deadband - The low alarm bit is set when

the input falls below the user-defined low alarm value. If a deadband is programmed, the low alarm bit will reset when the input rises above the level equal to the low alarm value plus the deadband.

• High Alarm With Deadband - The high alarm bit is set when

the input rises above the user-defined high alarm value. If a deadband is programmed, the high alarm bit will reset when the input falls below the level equal to the high alarm value and deadband.

Overrange Limit

High Alarm Limit

Input Channel

Low Alarm Limit

Underrange Limit

Figure 4.4 Deadband Example

without deadband with deadband

Time

The process passes through the deadband before the alarm is disabled to provide stability to alarm indicators

deadband

alarm inactive

alarm active

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High Alarm Limit

Input Channel

4–13Configuring the Module

Rate Alarm

This bit is set when the input changes at a rate faster than the user-defined value. Rate of change values can range from 0.05% to 50% of the input’s full scale range per second. Full scale range is defined as the difference between the high scale value and the low scale value. The rate is specified in scaled units per second.

Figure 4.5 Rate of Change Alarm

Select the change in input that should activate the alarm to alert the user of potential problems.

Low Alarm Limit

alarm inactive

alarm active

Time

Digital Filtering

This value specifies the time constant for a digital first order lag filter on the input. It is specified in units of 0.1 seconds. Values range from 0.1-9.9 seconds in BCD and 0.1-10.0 seconds in binary. A value of 0 disables the filter.

The digital filter equation is a classic first order lag equation (Figure 4.6). Using a step input change to illustrate the filter response (Figure 4.7), 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 4.6 Digital Filter Equation

Yn = Y

n-1

t + TA

– Y

n-1

)

Where:

n = present output, filtered peak voltage (PV)

n -1 = previous output, filtered PV

t = module channel update time (seconds)

TA = digital filter time constant (seconds)

n = present input, unfiltered PV

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4–14 Configuring the Module

Amplitude

Figure 4.7 Digital Filter Lag Equation Illustration

100%

63%

Unfiltered Input

TA = 0.01 sec

TA = 0.5 sec

TA = 0.99 sec

0 0.01 0.5 0.99 Time in Seconds

Thermocouple Type

This field lets you select the type of sensor connected to a thermocouple input channel. This field must be 0 for all other channel types.

Sensor Type Binary Value

Decimal 15 14 13 12

Octal 17 16 15 14

Millivolt 0 0 0 0

B 0 0 0 1

E 0 0 1 0

J 0 0 1 1

K 0 1 0 0

R 0 1 0 1

S 0 1 1 0

T 0 1 1 1

For 1771ĆNT2 only.

1 0 0 0

1 0 0 1

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4–15Configuring the Module

RTD Type

This field lets you select the type of sensor connected to a 650 ohm input channel. This field must be 0 for all other channel types.

Sensor Type Binary Value

Decimal 10 09 08

Octal 12 11 10

Resistance 0 0 0

100 Ohm Pt. European Std. 0 0 1

100 Ohm Pt. U.S. Std. 0 1 0

10 Ohm Copper 0 1 1

120 Ohm Nickel 1 0 0

10 Ohm Offset

This field lets you compensate for a small offset error in a 10 ohm copper RTD. Values can range from -0.99 to +0.99 ohms in units of

0.01 ohms.

Configuration Block for a Block Transfer Write

Word/Dec. Bit

Word/Octal Bit

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

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

For example, if the resistance of a copper RTD used with this

channel was 9.74 ohms at 25

C, you would enter -0.26 in this field.

The configuration block for a block transfer write consists of:

• module configuration header

• output channel data (if applicable)

• output channel programming (if applicable)

• input channel programming (if applicable)

Block Transfer Write Configuration Data Header

The configuration data header consists of information required for the processor to properly identify the type of information it will be receiving.

Module Configuration Data Header

BTW word type Constant Number of outputs Constant

1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0

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4–16 Configuring the Module

Bit/Word Description of Word 0

Word Bit Definition

Word 0 00Ć03 Constant = 0

Bits 04Ć07 Number of outputs = 0010

Bits 10Ć15 Constant = 00 1000

Bits 16Ć17 Block transfer write type = 10

The next group of words sets the outputs of the module, if the module has outputs. For example, if this is a 2 output/6 input module, words 1 and 2 would contain the data for the two output channels. If the module has four outputs, words 1 thru 4 would contain output channel data.

Output Configuration Words 1 and 2

Word/Dec. Bit

Word/Octal Bit

1 Channel 1 Output Data

2 Channel 2 Output Data

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

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

Bit/Word Description of Output Configuration Words 1 and 2

Word

Word 1 Bits 00Ć15 (00Ć17) First Output channel data

Word 2 Bits 00Ć15 (00Ć17) Second Output channel data

Decimal Bit

(Octal Bit)

Additional module configuration data is contained in the next two words. This includes verify, temperature scale, BCD select, cold junction alarm enable and real time sample time. These are explained in the bit/word description.

Output Configuration Words 3 and 4

Word/Dec. Bit

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

Definition

Word/Octal Bit

4 RTS Sample Time: 1 millisecond units

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

CJ alarm

enable

Unused = 0

BCD

select

Temp scale

Verify

Bit/Word Description of Output Configuration Words 3 and 4

4–17Configuring the Module

Word

Word 3 Bit 00

Word 4

Decimal Bit

(Octal Bit)

Verify. If this bit is set to 1, the module will compare its current programming with the programming downloaded in the BTW. If they are the same, it will verify good; if they are different, the module will verify bad. In no case will any programming data in the BTW be applied to the module.

Bit 01 Temperature scale. 0 = Celsius, 1 = Fahrenheit

Bit 02

Bits 03Ć14

(03Ć16)

Bit 15 (17)

Bits 00Ć15

(00Ć17)

BCD select. 1 = all values in BCD format.

Not used. Always 0

CJ alarm enable. A value of 1 enables over and underrange indication for the cold junction channel. If the module does not have a cold junction channel, this bit is 0.

Real time sample. Sample time in milliseconds.0=off. RTS minimum is 100msec (counts = 100). Maximum 10 seconds in binary; 9.999 seconds in BCD.

Definition

0 = all values in 2's complement binary

Output Programming

The next group of six words contain channel-specific parameters. This includes low and high scale values, low and high clamp values, ramp rate, reset state, alarm enable and reset value.

Output Configuration Words 5 through 10

Word/Dec. Bit

Word/Octal Bit

5 Low Scale Value

6 High Scale Value

7 Low Clamp Value

8 High Clamp Value

10 Reset Value

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

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

Channel 1 Programming

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

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4–18 Configuring the Module

Bit/Word Description of Output Configuration Words 5 through 10

Word

Word 5

Word 6

Word 7

Word 8

Word 9

continued

Decimal Bit

(Octal Bit)

Bits 00Ć15

(00Ć17)

Bits 00Ć15

(00Ć17)

Bits 00Ć15

(00Ć17)

Bits 00Ć15

(00Ć17)

Bits 00Ć11

(00Ć13)

Bit 12 (14) Constant = 0

Bits 13Ć14

(15Ć16)

Low scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

High scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

Low clamp value for channel 1. The channel output will not be allowed to go below this value (in scaled units) regardless of the data sent to the module. Clamp values are limited to

32767 in binary format; +7999 in BCD format.

High clamp value for channel 1. The channel output will not be allowed to go above this value (in scaled units) regardless of the data sent to the module. Clamp values are limited to

32767 in binary format; +7999 in BCD format.

Maximum ramp rate. If this field is not 0, the module will limit the maximum rate of change for this channel to be a percentage of the full scale range of the module. Legal values are from 1 to 200%.

Reset state. This field controls what an output channel will go to if the I/O reset line is asserted: 00 binary = last state; 01 binary = minimum output; (example: < Ć10V, < 4mA) 10 binary = maximum output; (example: > 10V, > 22mA) 11 binary = user reset value.

Definition

Bit 15 (17)

Word 10

Bits 00Ć15

(00Ć17)

The above six words of output channel-specific information would be repeated for the next output channel (2), as shown below. The bit/word descriptions would be the same as above.

Word/Dec. Bit

Word/Octal Bit

11 Low Scale Value

12 High Scale Value

13 Low Clamp Value

14 High Clamp Value

16 Reset Value

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

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

Channel 2 Programming

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

Alarm enable. If set to 1, the module reports high clamp, low clamp and rate limit. If 0, these warnings are suppressed.

Reset value. If the user selects the channel to go to a user reset value upon I/O reset, the value in scaled units is entered here. Otherwise, set to 0.

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4–19Configuring the Module

The following six words configure the first input channel of the module. These words are repeated as necessary for each input in the module. For example, if this is a 2 output/6 input module, words 1 through 4 would configure the module, words 5 through 16 would configure the 2 output channels (six words each). Then six groups of seven words each (one group for each input channel) would configure the module’s six input channels.

Input Programming

Word/Dec. Bit

Word/Octal Bit

17 Low Scale Value

18 High Scale Value

19 Low Alarm Value

20 High Alarm Value

22 Filter Time Constant: 0.1 second units Alarm Deadband

23 Thermocouple Type 0 RTD Type 10 Ohm Offset: 0.01 Ohm units

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

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

Channel 3 Programming

Alarm

enable

Rate Alarm: Scaled Units per second

Bit/Word Description of Input Configuration Words 17 through 23

Word

Word 17

Word 18

Decimal Bit

(Octal Bit)

Bits 00Ć15

(00Ć17)

Bits 00Ć15

(00Ć17)

Definition

Low scale value for channel 3.

High scale value for channel 3.

Word 19

Word 20

Word 21

Word 22 Bits 00Ć07

Bits 00Ć15

(00Ć17)

Bits 00Ć15

(00Ć17)

Bits 00Ć14

(00Ć16)

Bit 15 (17)

Low alarm value for channel 3.

High alarm value for channel 3.

Rate alarm. If the channel's input changes at a rate faster than this value and the alarm enable bit is set, the channel will indicate a rate alarm condition. Legal values are from 0.05 to 50% of full scale per second.

Alarm enable bit. If set to 1, the module will report high alarm, low alarm, underrange, overrange, and rate alarm conditions. If 0, these warnings are suppressed.

Alarm deadband. This field creates a hysteresis effect on the low and high alarms. For an alarm condition to be removed, the input signal must go above the low alarm limit or below the high alarm limit by an amount equal to the specified deadband. Alarm deadband values must be less than or equal to one half the difference of the high and low alarm values.

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4–20 Configuring the Module

Word 23

Word

Decimal Bit

(Octal Bit)

Bits 8Ć15

(10Ć17)

Bits 00Ć07

Bits 08Ć10

(10Ć12)

Bit 11 (13) Constant = 0

Bits 12Ć15

(14Ć17)

Filter time constant. Specifies the time constant of a digital, first order lag filter on the input in 0.1 second units. Legal values are 0.1 to 10.0 seconds (binary) or 0.1 to 9.9 (BCD). A value of 0 disables the filter.

10 ohm offset. Compensates for a resistance offset on a 10 ohm copper RTD. Range of + other RTDs.

RTD type. Specifies type of RTD linearization on RTD channels:

001 = 100 ohm Pt, European standard; 010 = 100 ohm Pt. US standard; 011 = 10 ohm copper; 100 = 120 ohm nickel.

This field is 0 for nonĆRTD channels.

Thermocouple type. Specifies type of TC linearization on TC channels.

0000 = millivolts; 0001 = B; 0010 = E; 0011 = J; 0100 = K; 0101 = R; 0110 = S; 0111=T; 1000= C (1771ĆNT2 only), 1001= N (1771ĆNT2 only).

This field must be 0 for nonĆthermocouple channels.

Definition

0.99 ohms, in units of 0.01 ohms. This field must be 0 for all

Chapter Summary

The above group of words would be repeated for each of the remaining five input channels. The bit/word descriptions would be identical for each of those channels.

Refer to the Appendix specific to your module for block transfer write configurations to be used with your module.

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

Publication 1771ĆUM127B-EN-P - December 2002

Chapter 5

Module Status and Input Data

Chapter Objectives

Reading Data from the Module

In this chapter you will read about:

• reading data from your module

• block transfer read data format

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

The transferred words contain module status, channel status and input data from the module. The maximum BTR data file length required is 28 words.

Block transfer reads are defined for each type of module platform, rather than type of outputs/inputs. The types of modules are:

Possible Combinations Appendix

8 out/0 in C

7 out/1 in K

6out/2in I

5out/3in J

4 out/4 in H

3 out/5 in G

2 out/6 in E

1out/7in F

0 out/8 in B

2 out/2 in D

For example, the BTR from the 1771-NB4T (two 0-25mA out/two thermocouple in) is identical to the BTR for the 1771-NB4S (two 0-25mA out/two 4-20mA in), since both are 2 input/2 output modules.

When you perform a BTR for a specific module, the bits for fields that do not pertain to your specific module are set to zero.

Complete block transfer read data formats and bit/word descriptions for your particular module are shown in the Appendices.

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5–2 Module Status and Input Data

Block Transfer Read Data Format

The block transfer read data format consists of an initial block header which identifies the type of module (input, output, or output/input), and groups of words that contain information on either an input channel or an output channel.

Output channel words are configured immediately after the block header. If the module contains both output and input channels, the output channel words come first in the block transfer read data format.

Outputs Only" Block Transfer Read Data Header

This header is used for modules with outputs only (such as cat. no. 1771-NOC and 1771-NOV).

Word/Dec. Bit

Word/Octal Bit

0 Constant = 8800 Hexadecimal

2 Constant = 8000 Hexadecimal

3 Unused = 0

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

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

Power up

Bad Chan. Data

Mod Alarm

RTS Time out

I/O Reset

Program Verify

Mod Fault

Bad Prog

Bad Struct

Unused = 0

The bit/word descriptions for the “outputs only” header block are shown below.

Word

Word 0 Bits 00Ć15

Word 1

Decimal Bit

(Octal Bit)

(00Ć17)

Bit 00-05

Bit 06

Bit 07

Bit 08 (10)

Bits 09Ć10

(11Ć12)

Bit 11 (13)

Definition

Always 8800 Hexadecimal

Not used. Always 0

Bad structure. This bit is set if there is an error in the BTW header.

Bad program. This bit is set if any of the module level programming data is illegal.

Module fault. This bit is set if any of the programming data sent to the module in the most recent BTW was illegal, or if one or more channels has the bad calibration bit set.

Program verify. Indicates the result of verify request.

00 = verify not requested; 10 = verify failed; 11 = verify succeeded

I/O reset. This bit is set whenever the I/O reset line on the backplane is asserted.

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Bit 12 (14)

RTS timeout. This bit is set if a BTR was not requested of the module within the RTS sample time.

5–3Module Status and Input Data

Word/Dec. Bit

Word

Word 1 continued

Word 2 Always 8000 hexadecimal.

Word 3 Not used. Always 0

Decimal Bit

(Octal Bit)

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Module alarm. This bit is set if there is an alarm bit set for one or more channels. The input alarm bits are low, high alarm and rate alarm. The output channel alarm bits are low and high clamp, and the rate limit alarm.

Bad channel data. This bit is set if the module is in BCD mode and one or more of the input data values sent in the last BTW are not legal BCD values.

Powerup bit. This bit is set until a BTW with programming data is received by the module.

Definition

Inputs Only" and Output/Input" Block Transfer Read Data Header

This following three-word header is used if the module only has input channels, or if it contains both input and output channels.

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

Word/Octal Bit

0 Constant = 8800 Hexadecimal

2 1 Unused = 0

3 Cold Junction Temperature; Units of 0.01 degrees C or 0.1 degrees F

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

Power up

Bad Chan. Data

Mod Alarm

RTS Time out

I/O Reset

Program Verify

Mod Fault

Bad Prog

Bad Struct

Unused = 0

The bit/word descriptions for the “inputs only” and “output/input” header block are shown below.

Word

Word 0

Word 1

Decimal Bit

(Octal Bit)

Bits 00Ć15

(00Ć17)

Bits 00Ć05 Not used

Bit 06

Bit 07

Always = 8800 hexadecimal

Bad structure. This bit is set if there is an error in the BTW header.

Bad program. This bit is set if any of the module level programming data is illegal.

Definition

CJC Over

Range

CJC

Under

Range

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5–4 Module Status and Input Data

Word

Word 1 continued

Decimal Bit

(Octal Bit)

Bit 08 (10)

Bits 09Ć10

(11Ć12)

Bit 11 (13)

Bit 12 (14)

Bit 13 (15)

Bit 14 (16)

Bit 15 (17)

Bit 00

Definition

Module fault. This bit is set if any of the programming data sent to the module in the most recent BTW was illegal, or if one or more channels has the bad calibration bit set.

Program verify. Indicates the result of verify request. 00 = verify not requested; 10 = verify failed; 11 = verify succeeded

I/O reset. This bit is set whenever the I/O reset line on the backplane is asserted.

RTS timeout. This bit is set if a BTR was not requested of the module within the RTS sample time.

Bad channel data. This bit is set if the module is in BCD mode and one or more of the input data values sent in the last BTW are not a legal BCD value.

Powerup bit. This bit is set until a BTW with programming data is received by the module.

Cold junction compensation (CJC) underrange bit. This bit is set if the CJC temperature is below 0

Word/Dec. Bit

Word/Octal Bit

Cold junction compensation (CJC) overrange bit. This bit is set if the CJC temperature is above 70

Not used. Always 0

Cold junction temperature. Units of 0.01 degrees C or 0.1 degrees F. (0.1 degrees C or 1.0 degrees F in BCD.)

Word 2

Word 3

Bit 01

Bits 02Ć14

(02Ć16)

Bit 15 (17) Always = 1

Bits 00Ć15

(00Ć17)

Input Status Data

Each input channel has two words associated with it. One word provides underrange, overrange, low and high alarms, rate alarm, bad program and bad calibration information to the processor. The second word contains channel input data. These words would immediately follow the header on modules containing only inputs, or after the output channel words on modules containing both outputs and inputs.

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

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

Channel 1 Status

4 1 Unused = 0 Bad

5 Channel 1 Input Data

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Calib

Bad Prog

0 Rate

Alarm

High Alarm

Low

Unused = 0 Over

Alarm

Range

Under Range

5–5Module Status and Input Data

The above two words would be repeated for each input channel. For example, if this module had two input channels, the following words would be used.

Word/Dec. Bit

Word/Octal Bit

4 1 Unused = 0 Bad

5 Channel 1 Input Data

6 1 Unused = 0 Bad

7 Channel 2 Input Data

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

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

Channel 1 Status

Bad

Calib

Prog

Channel 2 Status

Bad

Calib

Prog

Bit/word descriptions for the input status data words are shown below.

Bit/Word Description for Input Status Data Words

Word

Decimal Bit

(Octal Bit)

Bit 00

Bit 01

0 Rate

Alarm

0 Rate

Alarm

Underrange bit. This bit is set if the input signal is below the input channels minimum range.

Overrange bit. This bit is set if the input signal is above the input channels maximum range.

High Alarm

Low Alarm

Definition

Unused = 0 Over

Range

Unused = 0 Over

Range

Under Range

Word 4

Word 5

Bits 02-03 Not used. Always 0

Bit 04

Bit 05

Bit 06

Bit 07 Not used. Always 0

Bit 08 (10)

Bit 09 (11)

Bits 10Ć14

(12Ć16)

Bit 15 (17) Not used. Always = 1

Bits 00Ć15

(00Ć17)

Low alarm. This bit is set if alarms are enabled and the input data is lower than the low alarm setpoint.

High alarm. This bit is set if alarms are enabled and the input data is higher than the high alarm setpoint.

Rate alarm. This bit is set if the input signal changed at a rate faster than the input rate alarm setpoint.

Bad program. This bit is set if any of the channel level programming data is illegal.

Bad calibration. This bit is set if the channel has not had a valid calibration.

Not used. Always 0

Channel 1 input data.

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5–6 Module Status and Input Data

Output Status Data

Each output channel also has two words associated with it. The first word contains low and high clamp, rate alarm, bad data, bad program and bad calibration information for the processor. This is followed by raw count data for that channel. If the module contains both input and output channels, the output channel words would immediately follow the header words.

Word/Dec. Bit

Word/Octal Bit

4 Unused = 0 Bad

5 Channel 1 Raw Count sent to DAC

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

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

Channel 1 Status

Bad

Calib

Prog

Data

The above two words would be repeated for each output channel. For example, if this module had two output channels, the following words would be used.

Word/Dec. Bit

Word/Octal Bit

4 Unused = 0 Bad

5 Channel 1 Raw Count sent to DAC

6 Unused = 0 Bad

7 Channel 2 Raw Count sent to DAC

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

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

Channel 1 Status

Bad

Calib

Prog

Data

Channel 2 Status

Bad

Calib

Prog

Data

Rate Alarm

High Clamp

Low Clamp

Unused = 0

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Bit/Word Description for Output Status Data Words

5–7Module Status and Input Data

Word

Word 4

Word 5

Decimal Bit

(Octal Bit)

Bit 00-03 Not used. Always 0

Bit 04

Bit 05

Bit 06

Bit 07

Bits 08 (10)

Bit 09 (11)

Bits 10Ć15

(12Ć17)

Bits 00Ć15

(00Ć17)

Low clamp. This bit is set if alarms are enabled and the output data is lower than the low clamp value.

High clamp. This bit is set if alarms are enabled and the output data is higher than the high clamp value.

Rate alarm. This bit is set if alarms are enabled and the output data changed faster than the programmed ramp rate.

Bad data. This bit is set if BCD format was chosen and the output data is not a legal BCD value.

Bad programming. This bit is set if the most recent BTW contained improper programming data for this channel

Bad calibration. This bit is set if the channel has not had a valid calibration.

Not used. Always = 0

Channel 1 Raw data sent to DAC.

Definition

Refer to the Appendix specific to your module for block transfer read configurations.

Chapter Summary

In this chapter you learned the meaning of the status information that the modules send to the processor.

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5–8 Module Status and Input Data

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Module Calibration

Chapter 6

Chapter Objective

Tools and Equipment

Tool or Equipment Description

Precision Voltage Source 0-10V, 1µV resolution

Precision Resistors

Precision Decade

Resistor Box

In this chapter we tell you how to calibrate your module. Your module is shipped from the factory already calibrated. This

chapter tells you how to recalibrate or change calibration.

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

High Precision Resistors: 649 ohm, 0.01%, 5ppm/ 1 ohm, 0.1%, 5ppm/

Accuracy: Minimum three decades; Decade one - 10 ohm decade, 1 ohm per step, better than 0.005 ohms (0.5% accuracy) Decade two - 100 ohm decade, 10 ohm per step, better than 0.005 ohms (0.05% accuracy) Decade three - 1000 ohm decade, 100 ohm per step, better than 0.01% accuracy

Any vendor's model that meets or exceeds the above specifications can be used. The user is responsible for assuring that the decade box maintains accuracy by periodic calibration as specified by the vendor. As a service to its customers, AllenĆBradley offers this partial list of vendors who can supply decade resistor boxes that meet or exceed the specifications.

Lower Precision Resistors: If calibration to rated accuracy is not required, lower precision resistors

can be used. Add percentage of tolerance and temperature coefficient error for expected accuracy. Refer to 6.A and 6.B below.

Precision Multimeter

Industrial Terminal and Interconnect Cable

Electro Scientific Industries Portland, OR Series DB 42

50mA, 1µA resolution 10V, 1µV resolution

Programming terminal for A-B family processors

IET Labs Westbury, NY HARS-X Series

If calibration to rated accuracy is not required, lower precision resistors can be used. Add the percentage of tolerance and the temperature coefficient error for expected accuracy.

Resistor Accuracy

Resistors change value over time. Both load life and temperature reduce the accuracy. The best way to determine the resistance of a resistor is to measure its value to the accuracy needed under the conditions in which it is used.

Julie Research Labs New York, NY DR 100 Series

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6–2 Module Calibration

Table 6.A Resistor Tolerance vs. Expected Error

Resistor Tolerance Expected Error

0.1% 0.1%

0.5% 0.5%

1.0% 1.0%

Note: If the tolerance error of the 649 ohm resistor is > than

18 ohms (2.8%), calibration will fail.

Table 6.B Temperature Coefficient Error

Calibrating Your Module

Temperature

Coefficient of

Resistor

25ppm/oC10

50ppm/oC10

200ppm/oC10

nT (Calibration

temperature

deviation from 25

5oC 0.081 ohms (0.012%)

20oC 0.325 ohms (0.05%)

5oC 0.162 ohms (0.025%)

20oC 0.649 ohms (0.1%)

5oC 0.649 ohms (0.1%)

20oC 2.596 ohms (0.4%)

C 0.162 ohms (0.025%)

C 0.325 ohms (0.05%)

C 1.298 ohms (0.2%)

Expected Error

Example: Using a 649 ohm resistor, rated for 1% accuracy, with a

temperature coefficient of 50ppm/ of 1.05% (1.0% plus 0.05%) when calibration is done at 35

C).

of 10

C, provides an expected accuracy

C (nT

The analog module is shipped already calibrated. If it becomes necessary to recalibrate the module, you must calibrate the module in an I/O chassis. The module must communicate with the processor and an industrial terminal.

Publication 1771ĆUM127B-EN-P - December 2002

Calibration service is available from Allen–Bradley. Contact your local sales office or field support center for information on how to send your module in for calibration. Modules under warranty will be calibrated at no charge. Modules out of warranty, sent in for calibration only, will be calibrated for less than the standard repair charge.

Before calibrating the module, you must enter ladder logic into the processor memory, so that you can send block transfer data to the module, and the processor can read block transfer data from the module.

Calibration can be accomplished using any of three methods:

6–3Module Calibration

• manual calibration – refer to the procedure below.

• 6200 I/O CONFIG software – refer to your 6200 software

publications (release 4.2 or later) for procedures for calibrating.

• PCO operator interface software – refer to your 6190-PCO

software publications for procedures for calibrating.

Indicator Operation During Calibration

During calibration, the RUN/FLT indicator will turn to green. The CAL/COM indicator will turn to flashing red. The indicators will remain with these indications throughout the calibration procedure.

Manual Calibration

Word/Dec. Bit

Word/Octal Bit

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

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

You can calibrate any number of channels, in any order. The following procedures define how to calibrate input and output channels.

In order to allow the module to stabilize,

IMPORTAN

energize the module for at least 30 minutes before calibrating.

Set up a block transfer write data file as shown in table 6.C.

Input Channel Calibration

1. Set the appropriate bit in the BTW input calibration mask (word

2); channel 1 is bit 00, channel 2 is bit 01, etc. If calibrating only one channel, set the appropriate bit. If calibrating all channels (all inputs), set bits (00 through 07). Refer to Table 6.C.

Table 6.C Calibration Block Transfer Write

0 Calibration BTW Header = CC00 Hexadecimal

Cal

1 Unused = 0

2 Unused = 0 Input Cal Mask

3 Unused = 0 Output Cal Mask

4 1st Low Output Cal Value

5 1st High Output Cal Value

6 2nd Low Output Cal Value

7 2nd High Output Cal Value

8 3rd Low Output Cal Value

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Clk

High/

Low

6–4 Module Calibration

Word/Dec. Bit

Word/Octal Bit

9 3rd High Output Cal Value

10 4th Low Output Cal Value

11 4th High Output Cal Value

12 5th Low Output Cal Value

13 5th High Output Cal Value

14 6th Low Output Cal Value

15 6th High Output Cal Value

16 7th Low Output Cal Value

17 7th High Output Cal Value

18 8th Low Output Cal Value

19 8th High Output Cal Value

2. Apply the appropriate low reference signal (Table 6.D) to all input channels being calibrated (for channel 1, I1 on RTP).

Table 6.D Calibration Reference Signal Values

00010203040506070809101112131415

00010203040506071011121314151617

Type Low Reference Value High Reference Value

5 Volt input 0.0000V 5.0000V

10V input 0.0000V 10.0000V

4-20mA sourcing input 1.000mA 21.000mA

-5 to 55mV/TC input 0.000mV 55.000mV

100mV/TC input 0.000mV 100.000mV

650 Ohm RTD input 1.000 Ohms 649.0 Ohms

10V output 0.000V 10.000V

25mA output 0.500mA 22.000mA

50mA output 1.000mA 50.000mA

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Figure 6.1 Connecting a Resistor or Decade Resistance Box to the Remote Termination Panel

Connect the resistor across terminals R1-I1 and O1.

640 ohm resistor for high reference value. 1 ohm resistor for low reference value.

If using a decade resistance box, connect in place of the resistor

6–5Module Calibration

Decade resisĆ tance box

12935-I

3. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 1, and HI/LO bit (00) = 0.

4. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 0, and HI/LO bit (00) = 0.

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6–6 Module Calibration

Table 6.E Calibration Block Transfer Read

Word/Dec. Bit

Word/Octal Bit

0 Calibration BTR Header = C000H

1 Unused = 0 Range EEPROM

2 Input Cal Done bits

3 Output Cal Done bits

4 Input Bad Cal bits

5 Output Bad Cal bits

6 Corrected Channel 1 Data

7 Corrected Channel 2 Data

8 Corrected Channel 3 Data

9 Corrected Channel 4 Data

10 Corrected Channel 5 Data

11 Corrected Channel 6 Data

12 Corrected Channel 7 Data

13 Corrected Channel 8 Data

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

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

5. Apply the appropriate high reference signal (Table 6.D) to all input channels being calibrated (for channel 1, I1 on RTP).

6. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 1, and HI/LO bit (00) = 1.

7. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 0, and HI/LO bit (00) = 1.

8. Request a block transfer read (BTR) from the module. If the INPUT BAD CAL bit (block transfer read word 4, bit 00, for channel 1 for example) is reset, and the INPUT CAL DONE bit (BTR word 2, bit 00 for channel 1 for example) is set, the procedure is complete.

If the bad BTW bit (word 1, bit 00) is set any time during the calibration procedure, an error occurred during the calibration procedure. Repeat the calibration.

Bad

BTW

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If the EEPROM bit (word 1, bit 01) is set, the module has a hardware fault. The module cannot be calibrated.

If the RANGE bit (word 1, bit 02) is set, the channel(s) did not calibrate because one of the reference signals was out of range. Repeat the procedure. If the RANGE bit is set a second time, either the channel is bad, or there is a problem with the calibration equipment.

6–7Module Calibration

Output Channel Calibration

1. Set the appropriate bit in the BTW output calibration mask (word

3); channel 1 is bit 0, channel 2 is bit 01, etc. If calibrating only one channel, set the appropriate bit. If calibrating the entire module (all outputs), set all bits (00 through 07).

2. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 1, and HI/LO bit (00) = 0 and all output cal

values = 0.

3. Send a block transfer write to the module with CAL CLK bit (01) = 0, and HI/LO bit (00) = 0 and all output cal values = 0.

4. Measure the signal on the channel you are calibrating. Use the

appropriate equation below to calculate the output cal low value for this channel. Record this value for later use. Do not enter it

into the BTW file at this time.

10V Output

Y = (X x 6000) - 30000

Where: X = meter reading in volts

Y = output cal low/high value

25mA Output

Y = x 60000 - 30000

Where: X = meter reading in mA

Y = x 60000 - 30000

Where: X = meter reading in mA

5. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 1, and HI/LO bit (00) = 1 and all output cal

values = 0.

6. Send a block transfer write to the module with CAL CLK bit (01) = 0, and HI/LO bit (00) = 0 and all output cal values = 0.

7. Measure the signal on the channel you are calibrating. Use the

appropriate equation above (step 4) to convert the value to the output cal high value for this channel. Record this value for

later use. Do not enter it into the BTW file at this time.

(X - 0.500)

[

21.500

Y = output cal low/high value

50mA Output

(X - 1.000)

49.000

Y = output cal low/high value

]

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6–8 Module Calibration

8. Enter the first set of calculated low and high values into the first channel output cal values of the block transfer write calibration data file. If you are calibrating more than one output channel simultaneously, enter the output cal values from the lowest numbered output channel in the first output cal value slots. The next lowest channel in the output mask goes in the second slot of output cal values, and so on.

9. Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 1, and HI/LO bit (00) = 1.

10.Send a block transfer write to the module with word 1 containing CAL CLK bit (01) = 0, and HI/LO bit (00) = 1.

11. Request a block transfer read (BTR) from the module. If the OUTPUT BAD CAL bit (word 5, bit 00, for channel 1 for

example) is reset, and the OUTPUT CAL DONE bit (word 3, bit 00 for channel 1 for example) is set, the procedure is complete.

If the bad BTW bit is set any time during the calibration procedure, an error in the calibration procedure. Repeat the calibration.

Chapter Summary

If the EEPROM bit is set, the module has a hardware fault. The module cannot be calibrated.

In this chapter, you learned how to calibrate your module’s channels.

Publication 1771ĆUM127B-EN-P - December 2002

Troubleshooting

Chapter 7

Chapter Objective

Diagnostics Reported by the Module

We describe how to troubleshoot your module by observing indicators and by monitoring status bits reported to the processor.

At power-up, the module turns the RUN/FLT indicator to red, then checks for:

• correct RAM operation

• EPROM operation

• EEPROM operation

After passing initial diagnostics, the module turns the RUN/FLT indicator to flashing green. The indicator will continue to flash green until it receives a valid BTW. After the BTW, it will stay solid green during operation. It will turn red if it detects a fault condition. If the RUN/FLT indicator is red, block transfers will be inhibited.

The lower CAL/COM indicator flashes green when the module is communicating with the processor. The speed of the flashing is dependent upon system speed. If the module is accessed in less than 100ms intervals, the CAL/COM indicator will be solid red.

The module also reports status and specific faults (if they occur) in every transfer of data to the processor. Monitor the green/red indicators and status bits in the appropriate word of the BTR file when troubleshooting your module.

RUN/FLT

CAL/COM

11027-I

Figure 7.1 Indicators

Indicator When Green When Red

flashes - during initial powerĆup

RUN/FAULT

CAL/COM

solid - first valid block transfer write successfully completed

flashes - when communication is taking place between the PLC processor and the NĆseries module.

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solid - a fault is found

flashes - during calibration

7–2 Troubleshooting

Both indicators are OFF

RUN/FLT indicator ON red

Troubleshooting with the Indicators

Indication Probable Cause Recommended Action

RUN/FLT indicator is flashing green

RUN/FLT indicator is solid green Initial block transfer write successfully completed

Table 7.A shows indications, probable causes and recommended actions to correct common faults which may occur.

Table 7.A Troubleshooting Chart

No power to module

Possible short on the module LED driver failure

Microprocessor, oscillator or EPROM failure

If immediately after power-up, indicates RAM or EPROM failure.

If during operation, indicates possible microprocessor or backplane interface failure.

Internal fuse bad

Power-up diagnostics successfully completed.

Check power to I/O chassis. Recycle as necessary.

Replace module.

Normal operation.

CAL/COM indicator is green (solid or flashing)

CAL/COM indicator is green and RUN/FLT indicator is green but module data is wrong (for example, with cable off, input channel data values are at minimum scale values)

Status Reported by the Module

Normal operation None required

Internal module problem Replace module

Design your program to monitor module and channel status bits, and to take appropriate action depending on your application requirements. You may also want to monitor these bits while troubleshooting with your industrial terminal. The module sets a bit (1) to indicate it has detected one or more of the following module conditions as shown in Table 7.B.

The module sets a bit (1) to indicate it has detected one or more of the following input channel conditions (Table 7.D), or output channel conditions (Table 7.C).

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Table 7.B Module Status Reported in BTR Word 1

7–3Troubleshooting

Decimal Bit

(Octal Bit)

Word 1 Bit 00Ć05 Not used

Bit 06 Bad structure. This bit is set if there is an error in the BTW header.

Bit 07 Bad program. This bit is set if any of the module level programming

data is illegal.

Bit 08 (10) Module fault. This bit is set if any of the programming data sent to the

module in the most recent BTW was illegal, or if one or more channels has the bad calibration bit set.

Bits 09Ć10

(11Ć12)

Program verify. Indicates the result of verify request. 00 = verify not requested; 10 = verify failed; 11 = verify succeeded

Bit 11 (13) I/O reset. This bit is set whenever the I/O reset line on the backplane

is asserted.

Bit 12 (14) RTS timeout. This bit is set if no BTR was requested of the module

within the RTS sample time.

Bit 13 (15) Module alarm. This bit is set if there is an alarm bit set for one or more

channels. The input alarm bits are low, high alarm and rate alarm. The output channel alarm bits are low and high clamp, and the rate limit alarm.

Bit 14 (16) Bad channel data. This bit is set if the module is in BCD mode and

one or more of the input data values sent in the last BTW are not a legal BCD value.

Explanation

Bit 15 (17) Powerup bit. This bit is set until a BTW with programming data is

received by the module.

Word 2 Bit 00 CJC Underrange bit. This bit is set if the CJC temperature is below the

input channel minimum range.

Bit 01 CJC Overrange bit. This bit is set if the CJC temperature is above the

input channel maximum range.

Publication 1771ĆUM127B-EN-P - December 2002

7–4 Troubleshooting

Table 7.C Output Channel Status Word (1 per output channel)

Decimal Bit

(Octal Bit)

Bit 04 Low clamp. This bit is set if alarms are enabled and the output data is

lower than the low clamp value.

Bit 05 High clamp. This bit is set if alarms are enabled and the output data is

higher than the high clamp value.

Bit 06 Rate alarm. This bit is set if alarms are enabled and the output data

changed faster than the programmed ramp rate.

Bit 07 Bad data. This bit is set if BCD data format was chosen and the output

data was not a legal BCD value.

Bit 08 (10) Bad program. This bit is set if any of the channel level programming

data is illegal.

Bit 09 (11) Bad calibration. This bit is set if the channel has not had a valid

calibration.

Table 7.D Input Channel Status Word (1 per input channel)

Decimal Bit

(Octal Bit)

Bit 00 Underrange bit. This bit is set if the input signal is below the input

channels minimum range.

Definition

Chapter Summary

Bit 01 Overrange bit. This bit is set if the input signal is above the input

channels maximum range.

Bit 04 Low alarm. This bit is set if alarms are enabled and the input signal is

lower than the low alarm setpoint.

Bit 05 High alarm. This bit is set if alarms are enabled and the input signal is

higher than the high alarm setpoint.

Bit 06 Rate alarm. This bit is set if alarms are enabled and the input signal

changed at a rate faster than the input rate alarm setpoint.

Bit 08 (10) Bad program. This bit is set if any of the module level programming

data is illegal.

Bit 09 (11) Bad calibration. This bit is set if the channel has not had a valid

calibration.

In this chapter, you learned how to interpret the status indicators, status words and troubleshoot your analog module.

Publication 1771ĆUM127B-EN-P - December 2002

Specifications

General Specifications

Appendix A

Number of Channels (depends on specific module)

I/O Chassis Location any single I/O module slot

A/D Resolution 16 bits or 15 bits plus sign bit

D/A Resolution 14 bits or 13 bits plus sign bit

Input Filtering 6 pole, low pass hardware filter

Calibration Interval 1 year

Isolation Voltage

Maximum Backplane Current and Power Dissipation @ 5V

8 individually isolated, or 4 individually isolated

Designed to withstand 1000V dc continuous between input and output channels and between input and backplane connections. Modules are 100% tested at 1200V dc for 1 second between input channels and backplane connections.

Current Power 1771ĆNBRC 1.8A 8.5W 1771ĆNB4S 1.6A 7.0W 1771ĆNB4T 1.5A 5.0W 1771ĆNBSC 3.0A 13.0W 1771ĆNBTC 1.6A 7.5W 1771ĆNBV1 1.8A 8.0W 1771ĆNBVC 1.8A 8.5W 1771ĆNIS 2.9A 12.0W 1771ĆNIV 1.5A 6.0W 1771ĆNIV1 1.5A 6.0W 1771ĆNIVR 1.5A 6.0W 1771ĆNIVT 1.5A 5.5W 1771ĆNOC 2.9A 14.0W (20mA)

3.3A 16.0W (25mA) 1771ĆNOV 2.1A 10.0W 1771ĆNR 1.5A 6.0W 1771ĆNT1 1.5A 5.0W 1771ĆNT2 1.5A 5.0W

Environmental Conditions

Operational Temperature IEC 60068-2-1 (Test Ad, Operating Cold)

Storage Temperature IEC 60068-2-1 (Test Ab, Unpackaged, Nonoperating Cold)

Relative Humidity IEC 60068-2-30 (Test Db, Unpackaged, Nonoperating Damp Heat)

Shock

Operating Nonoperating

IEC 60068-2-2 (Test Bd, Operating Dry Heat) IEC 60068-2-14 (Test Nb, Operating Thermal Shock) 32 to 140°F(0to60°C) Ambient changes > 0.5 performance during periods of change.

IEC 60068-2-2 (Test Bb, Unpackaged, Nonoperating Dry Heat) IEC 60068-2-14 (Test Na, Unpackaged, Nonoperating Thermal Shock)

-40 to 185°F (-40 to 85°C)

5 to 95% noncondensing

IEC 60068-2-27 (Test Ea, Unpackaged Shock) 30g 50g

C per minute may temporarily degrade

Publication 1771ĆUM127B-EN-P - December 2002

SpecificationsA–2

Vibration IEC 60068-2-6 (Test Fc, Operating)

2g @ 10-500Hz

ESD Immunity IEC 61000-4-2

4kV contact discharges

Radiated RF Immunity IEC 61000-4-3

10V/m with 1kHz sine-wave 80% AM from 30MHz to 1000MHz 10V/m with 200Hz 50% Pulse 100% AM at 900MHz

EFT/B Immunity IEC 61000-4-4

1kV @ 5kHz on signal ports

Surge Transient Immunity IEC 61000-4-5

2kV line-earth (CM) on shielded ports

Conducted RF Immunity IEC 61000-4-6

10V rms with 1kHz sine wave 80% AM from 150kHz to 30MHz

Emissions CISPR 11

Group 1, Class A (with appropriate enclosure)

Enclosure Type None (open style

Connecting Cable(s)

1771ĆNC6 = 1.8m (6ft) 1771ĆNC15 = 4.6m (15ft)

Field Wiring Arm Wiring

Size

Insulation Category

14-22AWG (2.5-0.25mm2) solid or stranded copper wire rated at

C or greater

3/64 inch (1.2mm) maximum

Keying

Certifications (when product is marked)

Between 26 and 28 Between 32 and 34

UL UL Listed Industrial Control Equipment CSA CSA Certified Process Control Equipment

European Union 89/336/EEC EMC Directive,

compliant with: EN 61000-6-4, Industrial Emissions EN 50082-2, Industrial Immunity EN 61000-6-2, Industrial Immunity EN 61326, Meas./Control/Lab., Industrial Requirements

Australian Radiocommunications Act,compliant

C-Tick

with AS/NZS 2064, Industrial Emissions

1 Use this conductor category information for planning conductor routing . Refer to publication 1770Ć4.1, Industrial Automation Wiring and

Grounding Guidelines."

2 See the Product Certification link at www.ab.com for Declarations of Conformity, Certificates, and other certification details.

Publication 1771ĆUM127B-EN-P - December 2002

(selectable)

Specifications A–3

Temperature Specifications

±100mV Thermocouple Input -5 to +55mV Thermocouple Input 1Ć650Ω RTD Input

Input Range

Maximum Input Resolution

Default Display Resolution 0.01mV / 0.1°C (0.1°F) 0.1mV / 1.0°C (0.1°F) 0.01 ohm / 0.1°C (0.1°F)

Temperature Scale (per module) °C(°F) °C(°F) °C(°F)

Input Impedance >10MΩ >10MΩ

Thermocouple Linearization IPTSĆ68 standard, NBS MNĆ125 IPTSĆ68 standard, NBS MNĆ125

Cold Junction Compensation 0to70°C ±0.25°C 0to70°C ±0.25°C

Open Input Detection upscale upscale upscale

Open TC Leakage Current < 10 nA (maximum) < 10 nA (maximum)

Time to Detect Open Input 10s (maximum) 5s (maximum) 5s (maximum)

RTD Excitation Current 1mA (typical)

Input Overvoltage Protection 140V ac rms continuous 140V ac rms continuous 140V ac rms continuous

Normal Mode Rejection (50/60Hz) 50dB / 60dB (minimum) 50dB / 60dB (minimum) 50dB / 60dB (minimum)

Common Mode Rejection (60Hz) 150dB (typical) 150dB (typical) 150dB (typical)

Offset Drift (maximum) ±0.50µV/°C ±0.50µV/°C ±25 mΩ/°C

Gain Drift (maximum) ±35ppm/°C ±35ppm/°C ±50ppm/°C

Input Bandwidth 9Hz 9Hz 9Hz

Update Time (per module) 25ms (maximum) 25ms (maximum) 25ms (maximum)

Settling Time to within

0.1% of Full Scale

NonĆlinearity 0.02% of full range (maximum) 0.02% of full range (maximum) 0.02% of full range (maximum)

Accuracy with Calibration (includes nonĆlinearity, gain, offset)

Calibration Values 0.000 / 100.000mV 0.000 / 55.000mV 1.00 / 649.0Ω

Underrange Threshold -103.0mV -5.5mV 0.9Ω

Overrange Threshold +103.0mV +56.0mV 650Ω

Rate Alarm Value

Minimum (0.04% FSR) Maximum (50% FSR)

Scaling Points → Default Scaling Values

Maximum resolution is obtained by rescaling input data to counts.

These resolutions apply to the commonly used ranges for these thermocouples. See graphs.

Values shown are applicable when using 2's complement data format.

±105mV -5.5 to 56.0mv 4to650Ω

Type B: 300 to 1800oC (572 to 3272oF) Type E: -270 to 1000 Type J: -210 to 1200 Type K: -270 to 1372

Type R: -50 to 1768

Type S: -50 to 1768

Type T: -270 to 400

3.3µV/bit @ 15 bits with sign bit Type E, J, K, T 0.1°C (0.2°F) Type B, R, S: 0.3oC (0.6oF)

C (-454 to 1832oF)

C (-346 to 2192oF)

C (-454 to 2502oF)

C (-58 to 3214oF)

C (-454 to 752oF)

Type B: 300 to 1800oC (572 to 3272oF) Type C: 0 to 2315 Type E: -20 to 735 Type J: -37 to 966 Type K: -71 to 1372

Type N: -270 to 1300

Type R: -50 to 1768 Type S: -50 to 1768 Type T: -73 to 400

0.95µV/bit @ 16 bits unipolar Type E, J, K, T, N: 0.03°C (0.06°F) Type B, R, S: 0.1oC (0.2oF) Type C: 0.07oC (0.1oF)

C (32 to 4199oF)

C (-4 to 1355oF)

C (-34 to 1770oF)

C (-95 to 2502oF)

C (-450 to 2372oF)

C (-58 to 3214oF)

C (-99 to 752oF)

100Ω Pt a=0.00385 European standard:

-200 to +870

100Ω Pt a=0.003916 U.S. standard:

-200 to +630

10Ω copper:

-200 to +260

120Ω nickel:

-80 to +320

10mΩ/bit @ 16 bits unipolar 100Ω Pt & 120Ω Ni 0.03 °C (0.06°F) 10Ω Cu 0.3°C (0.5°F)

125ms (maximum) 125ms (maximum) 125ms (maximum)

0.01% of full range @ 25°C (typical)

0.05% of full range @ 25°C (maximum)

0.08mV / 0.9°C (1.6°F) per second 100mV / 1050°C (1890°F) per second

-100/+100mV → -10000/+10000

-300/1800°C → -3000/18000

-508/3272°F → -5080/32720

0.01% of full range @ 25°C (typical)

0.05% of full range @ 25°C (maximum)

24uV / 0.9°C (1.6°F) per second 30mV / 1050°C (1890°F) per second

-5/+55mV → -500/+5500

-300/1800°C → -3000/18000

-508/3272°F → -5080/32720

0.025% of full range @ 25°C (typical)

0.05% of full range @ 25°C (max.)

0.26Ω / 0.44°C (0.8°F) per second 325Ω / 550°C (990°F) per second

+1/650Ω→+10/6500

-200/900°C → -2000/9000

-328/1652°F → -3280/16520

Type C only:

-300/2500°C → -3000/25000

-508/4532°F →-508/4532

C (-328 to +1598oF)

C (-328 to +1166oF)

C (-328 to +500oF)

C (-112.1 to +608oF)

Publication 1771ĆUM127B-EN-P - December 2002

SpecificationsA–4

Temperature Resolution of Thermocouple Inputs

+100mV/Thermocouple Inputs

0.60

0.55

0.50

0.45

0.40

0.35

0.30

0.25

Resolution ( C/bit)

0.20

0.15

0.10

0.05

0.00

-200 0 200 400 600 800 1000 1200 1400 1600 1800

Temperature (°C)

0.80

0.70

0.60

0.50

0.40

0.30

Resolution ( F/bit)

0.20

0.10

0.00

-328 32 392 752 1112 1472 1832 2192 2552 2912 3272

Temperature (°F)

Thermocouple

JBS T K

Publication 1771ĆUM127B-EN-P - December 2002

-5/+55mV/Thermocouple Inputs

0.20

0.15

0.10

Resolution ( C/bit)°

0.05

0.032 °C Display Resolution Limit

0.00

-500 -300 -100 100 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500

-500 -300 -100 100 300 500 700 900 1100 1300 1500 1700 1900 2100 2300 2500 Temperature (°C)

Specifications A–5

0.25

0.20

0.15

0.10

Resolution ( F/bit)

0.06 °F Display Resolution Limit

0.05

0.00

-400 -40 320 680 1040 1400 1760 2120 2480 2840 3200

Temperature (°F)

Thermocouple

JBS T K

Publication 1771ĆUM127B-EN-P - December 2002

SpecificationsA–6

±5V Inputs ±10V Inputs 4Ć20mA Sourcing Input

Input Range +5.5V (±22mA with resistor) +10.5V (±42mA with resistor) 0.1Ć21.0mA

Input Resolution 168µV/bit (0.7µA/bit) 15 bits with sign bit 330µV/bit 15 bits with sign bit 330nA/bit 16 bits unipolar

Input Impedance >10MΩ >10MΩ 300Ω (maximum)

Loop Power Voltage Source

20 to 30V dc (0 to 20mA range) current limited to < 29mA

Input Overvoltage Protection 140V ac rms continuous 140V ac rms continuous 24V dc continuous

Open Input Detection upscale upscale downscale

Time to Detect Open Input 5s (maximum) 9s (maximum) 5s (maximum)

Open Input Detection Leakage Current < 1.0µA (maximum) < 1.0µA (maximum)

Normal Mode Rejection 50/60Hz 50dB / 60dB (minimum) 50dB / 60dB (minimum) 50dB / 60dB (minimum)

Common Mode Rejection (60Hz) 150dB (typical) 150dB (typical) 150dB (typical)

Offset Drift ±20µV/oC(±85nA/°C with resistor) ±30 µV/oC ±200nA/°C

Gain Drift ±35 ppm/oC(±55ppm/°C with resistor) ±35 ppm/oC ±95 ppm/oC

Input Bandwidth 9Hz 9Hz 9Hz

Update Time (per module) 25ms (maximum) 25ms (maximum) 25ms (maximum)

Settling Time to within 0.1% of Full Scale 125ms (maximum) 125ms (maximum) 125ms (maximum)

NonĆlinearity 0.02% of full range (maximum) 0.02% of full range (maximum) 0.02% of full range (maximum)

Accuracy with Calibration (including typical nonĆlinearity, gain,and offset) worst case

Calibration Values 0.0000V / 5.0000V 0.0000V / 10.0000V 1.000mA / 21.000mA

Underrange Threshold 0.8V dc (3.2mA) -10.4V dc 3.2mA

Overrange Threshold 5.2V dc (20.8mA) +10.4V dc 21.0mA

Rate Alarm Value minimum (0.04% FSR)

maximum (50% FSR)

Scaling Points → Default Scaling Values

0.01% of full range @ 25oC

0.05% of full range @ 25

1.6mV (6.4µA) per second

2.0V (8.0mA) per second

0.01% of full range @ 25oC

0.05% of full range @ 25

8mV per second 10V per second

0.025% of full range @ 25oC

0.05% of full range @ 25

6.4µA per second 8mA per second

1.0/5.0V → 1000/5000 -10 / +10V → -10000/+10000 4.0/20.0mA → 4000/20000

+10V Outputs 4-20mA (0-25mA) Outputs 0-50mA Outputs

Output Range +10.4V into an open circuit 0Ć25.0mA 0Ć50.0mA

Output Resolution 1.32mV/bit 13 bits with sign bit 3.2µA/bit 13 bits unipolar 6.4µA/bit 13 bits unipolar

Output Impedance 1.0Ω maximum >1MΩ >1MΩ

Output Drive Capability 1KΩ or larger (10mA maximum)

20.0mA maximum into 0Ć1kΩ

25.0mA maximum into 0Ć700Ω

20.0mA maximum into 0Ć1kΩ

25.0mA maximum into 0Ć700Ω

50.0mA maximum into 0Ć300Ω

Output Overvoltage Protection 140V ac rms continuous 140V ac rms continuous 140V ac rms continuous

Offset Drift ±400 µV/°C ±1.0µA/oC ±1.0µA/oC

Gain Drift ±50 ppm/oC ±50 ppm/oC ±50 ppm/oC

Update Time (per module) 25ms maximum 25ms maximum 25ms maximum

D/A Converter Ċ Settling Time to within 10% of Full Scale into a Resistive Load

Accuracy with Calibration (Including typical

NonĆlinearity, Gain, and Offset) worst case

5ms 500µs 500µs

0.01% of full range @ 25oC

0.08% of full range @ 25

0.01% of full range @ 25oC

0.08% of full range @ 25

0.01% of full range @ 25oC

0.08% of full range @ 25

Calibration Values 0.0/10.0V dc 0.5mA / 22.0 mA 1.0mA / 50.0 mA

Ramping Value minimum (1% FSR)

maximum (200% FSR)

Scaling Points → Default Scaling Values

Values shown are applicable when using two's complement data format.

See derating curves for various temperature, current and load conditions.

0.2V per second

40.0V per second

0.16mA per second

32.0mA per second

0.40mA per second

80.0mA per second

-10 / +10V → -10,000/+10,000 4.0 / 20.0mA → 4,000/20,000 10.0 / 50.0mA → 1,000/5,000

Publication 1771ĆUM127B-EN-P - December 2002

Specifications A–7

Figure A.2 Derating Curves for 50mA Outputs on the 1771ĆN Series Modules

Output Current vs. Ambient Temperature as a function of Load Resistance

Output Current (mA)

0102030405060

Ambient Temperature (

Important: If you require 60oC operation with 50mA outputs, install a resistance in series with the load impedance so that the total load impedance is equal to 300 ohms.

Publication 1771ĆUM127B-EN-P - December 2002

SpecificationsA–8

Publication 1771ĆUM127B-EN-P - December 2002

Appendix B

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771ĆN Series Modules

What This Appendix Contains

This appendix contains block transfer write and block transfer read configurations and bit/word descriptions for 1771-N series modules with no outputs and eight inputs.

Block Transfer Write Configuration Block for 8 Input Modules

Word/Dec. Bit

Word/Octal Bit

2 RTS Sample Time: 1 millisecond units

3 Low Scale Value

4 High Scale Value

5 Low Alarm Value

6 High Alarm Value

8 Filter Time Constant: 0.1 second units Alarm Deadband

9 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

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

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

BTW word type Constant Number of outputs Constant

1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0

CJ alarm

enable

Alarm

enable

Unused = 0

Channel 1 Programming

Rate Alarm: Scaled Units per second

BCD

select

Temp

scale

Verify

Channel 2 Programming

10 Low Scale Value

11 High Scale Value

12 Low Alarm Value

13 High Alarm Value

15 Filter Time Constant: 0.1 second units Alarm Deadband

16 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

17 Low Scale Value

18 High Scale Value

Alarm

enable

Rate Alarm: Scaled Units per second

Channel 3 Programming

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series ModulesB–2

Word/Dec. Bit

Word/Octal Bit

19 Low Alarm Value

20 High Alarm Value

Alarm

enable

Rate Alarm: Scaled Units per second

22 Filter Time Constant: 0.1 second units Alarm Deadband

23 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

Channel 4 Programming

24 Low Scale Value

25 High Scale Value

26 Low Alarm Value

27 High Alarm Value

Alarm

enable

Rate Alarm: Scaled Units per second

29 Filter Time Constant: 0.1 second units Alarm Deadband

30 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

Channel 5 Programming

31 Low Scale Value

32 High Scale Value

33 Low Alarm Value

34 High Alarm Value

Alarm

enable

Rate Alarm: Scaled Units per second

36 Filter Time Constant: 0.1 second units Alarm Deadband

37 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

00010203040506070809101112131415

00010203040506071011121314151617

Channel 6 Programming

38 Low Scale Value

39 High Scale Value

40 Low Alarm Value

41 High Alarm Value

Alarm

enable

Rate Alarm: Scaled Units per second

43 Filter Time Constant: 0.1 second units Alarm Deadband

44 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series Modules B–3

Word/Dec. Bit

Word/Octal Bit

Channel 7 Programming

45 Low Scale Value

46 High Scale Value

47 Low Alarm Value

48 High Alarm Value

50 Filter Time Constant: 0.1 second units Alarm Deadband

51 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

52 Low Scale Value

53 High Scale Value

54 Low Alarm Value

55 High Alarm Value

57 Filter Time Constant: 0.1 second units Alarm Deadband

58 Thermocouple Type 0 RTD Type 10 Ohm Offset; 0.01 Ohm units

Alarm

enable

Alarm

enable

Rate Alarm: Scaled Units per second

Channel 8 Programming

Rate Alarm: Scaled Units per second

00010203040506070809101112131415

00010203040506071011121314151617

Block Transfer Write Bit/Word Descriptions for 8 Input Modules

Word

Word 0

Word 1

Decimal Bit

(Octal Bit)

00-03 Constant = 0

Bits 04-07 Number of outputs = 0000

Bits 08-13

(10-15)

Bits 14-15

(16-17)

Bit 00

Bit 01 Temperature scale. 0 = Celsius, 1 = Fahrenheit

Bit 02

Constant = 00 1000 binary

Block transfer write type = 10 binary

BCD select. 1 = all values in BCD format.

Definition

0 = all values in 2's complement binary

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series ModulesB–4

Word

Word 1 continued

Word 2

Word 3

Word 4

Word 5

Word 6

Word 7

Decimal Bit

(Octal Bit)

Bits 03-14

(03-16)

Bit 15 (17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-14

(00-16)

Definition

Not used. Always 0

CJ alarm enable. A value of 1 enables over and underrange indication for the cold junction channel. If the module does not have a cold junction channel, this bit is 0.

Real time sample. Sample time in milliseconds.0=off. RTS minimum is 100msec (counts = 100). Maximum 10 seconds in binary; 9.999 seconds in BCD.

Low scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

High scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

Low alarm value for channel 1. Alarm values are limited to

32767 in binary format; +7999 in BCD format.

High alarm value for channel 1. Alarm values are limited to

32767 in binary format; +7999 in BCD format.

Bit 15 (17)

Word 8 Bits 00-07

Bits 08-15

(10-17)

Bits 00-07

Word 9

Bits 08-10

(10-12)

Bit 11 (13) Constant = 0

Alarm enable bit. If set to 1, the module will report high alarm, low alarm, underrange, overrange, and rate alarm conditions. If 0, these warnings are suppressed.

Filter time constant. Specifies the time constant of a digital, first order lag filter on the input in 0.1 second units. Legal values are 0.1 to 9.9 seconds. A value of 0 disables the filter.

10 ohm offset. Compensates for a resistance offset on a 10 ohm copper RTD. Range of +

0.99 ohms, in units of 0.01 ohms.

This field must be 0 for all other RTDs.

RTD type. Specifies type of RTD linearization on RTD channels: 001 = 100 ohm Pt, European standard;

010 = 100 ohm Pt. US standard; 011 = 10 ohm copper; 100 = 120 ohm nickel.

This field is 0 for non-RTD channels.

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series Modules B–5

Word

Word 9 continued

Words 10 thru 16 Same as words 3 thru 9 but for channel 2.

Words 17 thru 23 Same as words 3 thru 9 but for channel 3.

Words 24 thru 30 Same as words 3 thru 9 but for channel 4.

Words 31 thru 37 Same as words 3 thru 9 but for channel 5.

Words 38 thru 44 Same as words 3 thru 9 but for channel 6.

Words 45 thru 51 Same as words 3 thru 9 but for channel 7.

Words 52 thru 58 Same as words 3 thru 9 but for channel 8.

Decimal Bit

(Octal Bit)

Bits 12-15

(14-17)

Thermocouple type. Specifies type of TC linearization on TC channels. 0000 = millivolts;

0001 = B; 0010 = E; 0011 = J; 0100 = K; 0101 = R; 0110 = S; 0111=T; 1000 = C (1771ĆNT2 only); 1001 = N (1771ĆNT2 only).

This field must be 0 for non-thermocouple channels.

Definition

Block Transfer Read Word Assignments for 8 Input Modules

Word/Dec. Bit

Word/Octal Bit

0 Constant = 8800 Hexadecimal

2 1 Unused = 0

3 Cold Junction Temperature; Units of 0.01 degrees C or 0.1 degrees F

4 1 Unused = 0

5 Channel 1 Input Data

6 1 Unused = 0

7 Channel 2 Input Data

8 1 Unused = 0

9 Channel 3 Input Data

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

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

Power

Bad

Chan.

Data

Alarm

Mod

RTS Time

out

I/O

Reset

Program

Verify

Channel 1 Status

Bad

Calib

Channel 2 Status

Bad

Calib

Channel 3 Status

Bad

Calib

Mod

Fault

Bad

Prog

Bad

Prog

Bad

Prog

Bad

Prog

Bad

Struct

Rate

Alarm

Rate

Alarm

Rate

Alarm

High

Alarm

High

Alarm

High

Alarm

Low

Alarm

Low

Alarm

Low

Alarm

Unused = 0

CJC

Over

Range

Over

Range

Over

Range

Over

Range

CJC

Under

Range

Under

Range

Under

Range

Under

Range

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series ModulesB–6

Word/Dec. Bit

Word/Octal Bit

Channel 4 Status

Bad

10 1 Unused = 0

Calib

Bad

Prog

11 Channel 4 Input Data

Channel 5 Status

Bad

12 1 Unused = 0

Calib

Bad

Prog

13 Channel 5 Input Data

Channel 6 Status

Bad

14 1 Unused = 0

Calib

Bad

Prog

15 Channel 6 Input Data

Channel 7 Status

Bad

16 1 Unused = 0

Calib

Bad

Prog

17 Channel 7 Input Data

Channel 8 Status

Bad

18 1 Unused = 0

Calib

Bad

Prog

19 Channel 8 Input Data

20-27 For factory use only

00010203040506070809101112131415

00010203040506071011121314151617

Rate

Alarm

Rate

Alarm

Rate

Alarm

Rate

Alarm

Rate

Alarm

High

Alarm

High

Alarm

High

Alarm

High

Alarm

High

Alarm

Low

Alarm

Low

Alarm

Low

Alarm

Low

Alarm

Low

Alarm

Unused = 0

Over

Range

Over

Range

Over

Range

Over

Range

Over

Range

Under

Range

Under

Range

Under

Range

Under

Range

Under

Range

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series Modules B–7

Word 4

Block Transfer Read Bit/Word Descriptions for 8 Input Modules

Word

Word 0

Word 1

Decimal Bit

(Octal Bit)

Bits 00-15

(00-17)

Always = 8800 hexadecimal

Bits 00-05 Not used

Bit 06

Bit 07

Bad structure. This bit is set if there is an error in the BTW header.

Bad program. This bit is set if any of the module level programming data is illegal.

Module fault. This bit is set if any of the programming data sent

Bit 08 (10)

to the module in the most recent BTW was illegal, or if one or more channels has the bad calibration bit set.

Bits 09-10

(11-12)

Bit 11 (13)

Bit 12 (14)

Program verify. Indicates the result of verify request. 00 = verify not requested; 10 = verify failed; 11 = verify succeeded

I/O reset. This bit is set whenever the I/O reset line on the backplane is asserted.

RTS timeout. This bit is set if a BTR was not requested of the module within the RTS sample time.

Module alarm. This bit is set if there is an alarm bit set for one

Bit 13 (15)

or more channels. The input alarm bits are low, high alarm and rate alarm. The output channel alarm bits are low and high clamp, and the rate limit alarm.

Definition

Word 2

Word 3

Bad channel data. This bit is set if the module is in BCD mode

Bit 14 (16)

and one or more of the input data values sent in the last BTW are not a legal BCD value.

Bit 15 (17)

Bit 00

Bit 01

Bits 02-14

(02-16)

Powerup bit. This bit is set until a BTW with programming data is received by the module.

Cold junction compensation (CJC) underrange bit. This bit is set if the CJC temperature is below 0

Cold junction compensation (CJC) overrange bit. This bit is set if the CJC temperature is above 70

Not used. Always 0

Bit 15 (17) Always = 1

Bits 00-15

(00-17)

Bit 00

Bit 01

Cold junction temperature. Units of 0.01 degrees C or 0.1 degrees F. (0.1 degrees C or 1.0 degrees F in BCD.)

Underrange bit. This bit is set if the input signal is below the input channels minimum range.

Overrange bit. This bit is set if the input signal is above the input channels maximum range.

Bits 02-03 Not used. Always 0

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 0 Output/8 Input 1771-N Series ModulesB–8

Word

Word 4 continued

Decimal Bit

(Octal Bit)

Bit 04

Bit 05

Bit 06

Bit 07

Bit 08 (10)

Bit 09 (11)

Bits 10-14

(12-16)

Low alarm. This bit is set if alarms are enabled and the input data is lower than the low alarm setpoint.

High alarm. This bit is set if alarms are enabled and the input data is higher than the high alarm setpoint.

Rate alarm. This bit is set if the input signal changed at a rate faster than the input rate alarm setpoint.

Not used. Always 0

Bad program. This bit is set if any of the channel level programming data is illegal.

Bad calibration. This bit is set if the channel has not had a valid calibration.

Not used. Always 0

Definition

Bit 15 (17) Not used. Always = 1

Word 5

Bits 00-15

(00-17)

Channel 1 input data.

Words 6 and 7 Same as words 4 and 5 but for Channel 2

Words 8 and 9 Same as words 4 and 5 but for Channel 3

Words 10 and 11 Same as words 4 and 5 but for Channel 4

Words 12 and 13 Same as words 4 and 5 but for Channel 5

Words 14 and 15 Same as words 4 and 5 but for Channel 6

Words 16 and 17 Same as words 4 and 5 but for Channel 7

Words 18 and 19 Same as words 4 and 5 but for Channel 8

Words 20 thru 27 For factory use only

Publication 1771ĆUM127B-EN-P - December 2002

Appendix C

Block Transfer Write and Block Transfer Read Configurations for 8 Output/0 Input 1771ĆN Series Modules

What This Appendix Contains

This appendix contains block transfer write and block transfer read configurations and bit/word descriptions for 1771-N series modules with eight outputs and no inputs.

Block Transfer Write Configuration Block for 8 Output Modules

Word/Dec. Bit

Word/Octal Bit

010 0 0 1 0 0 0 1 0 0 0 0 0 0 0

1 Channel 1 Output Data

2 Channel 2 Output Data

3 Channel 3 Output Data

4 Channel 4 Output Data

5 Channel 5 Output Data

6 Channel 6 Output Data

7 Channel 7 Output Data

8 Channel 8 Output Data

9 Unused = 0

10 RTS Sample Time: 1 millisecond units

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

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

BTW word type Constant Number of outputs Constant

BCD

select

Temp

scale

Verify

Channel 1 Programming

11 Low Scale Value

12 High Scale Value

13 Low Clamp Value

14 High Clamp Value

16 Reset Value

17 Low Scale Value

18 High Scale Value

19 Low Clamp Value

20 High Clamp Value

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

Channel 2 Programming

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 8 Output/0 Input 1771-N Series ModulesC–2

Word/Dec. Bit

Word/Octal Bit

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

22 Reset Value

Channel 3 Programming

23 Low Scale Value

23 High Scale Value

25 Low Clamp Value

26 High Clamp Value

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

28 Reset Value

Channel 4 Programming

29 Low Scale Value

30 High Scale Value

31 Low Clamp Value

32 High Clamp Value

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

34 Reset Value

00010203040506070809101112131415

00010203040506071011121314151617

Channel 5 Programming

35 Low Scale Value

36 High Scale Value

37 Low Clamp Value

38 High Clamp Value

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

40 Reset Value

Channel 6 Programming

41 Low Scale Value

42 High Scale Value

43 Low Clamp Value

44 High Clamp Value

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

46 Reset Value

Channel 7 Programming

47 Low Scale Value

48 High Scale Value

49 Low Clamp Value

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 8 Output/0 Input 1771-N Series Modules C–3

Word/Dec. Bit

Word/Octal Bit

50 High Clamp Value

52 Reset Value

53 Low Scale Value

54 High Scale Value

55 Low Clamp Value

56 High Clamp Value

58 Reset Value

Alarm

enable

Alarm

enable

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

Channel 8 Programming

Reset State 0 Maximum Ramp Rate, % of Full Scale per second

Block Transfer Write Bit/Word Descriptions for 8 Output Modules

Word Bit Definition

00010203040506070809101112131415

00010203040506071011121314151617

Word 0

Word 1

Word 2

Word 3

Word 4

Word 5

Word 6

Word 7

Bits 00-03 Constant = 0

Bits 04-07 Number of outputs = 1000 binary

Bits 08-13

(10-15)

Bits 14-15

(16-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Constant = 00 1000 binary

Block transfer write type = 10 binary

First Output channel data

Second Output channel data

Third Output channel data

Fourth Output channel data

Fifth Output channel data

Sixth Output channel data

Seventh Output channel data

Word 8

Bits 00-15

(00-17)

Eighth Output channel data

Publication 1771ĆUM127B-EN-P - December 2002

Block Transfer Write and Block Transfer Read Configurations for 8 Output/0 Input 1771-N Series ModulesC–4

Word 15

DefinitionBitWord

Verify. If this bit is set to 1, the module will compare its current programming with the programming downloaded in the BTW. If

Bit 00

they are the same, it will verify good; if they are different, the module will verify bad. In no case will any programming data in the BTW be applied to the module.

Word 9

Word 10

Word 11

Word 12

Word 13

Word 14

Bit 01

Bit 02

Bits 03-15

(03-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-15

(00-17)

Bits 00-11

(00-13)

Temperature scale. 0 = Celsius, 1 = Fahrenheit

BCD select. 1 = all values in BCD format. All values are then entered in the selected format. If the field is a signed field, the most significant digit represents the sign.

Not used. Always 0.

Real time sample. Sample time in milliseconds.0=off. RTS minimum is 100msec (counts = 100). Maximum 10 seconds in binary; 9.999 seconds in BCD

Low scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

High scale value for channel 1. Scale values are limited to

32767 in binary format; +7999 in BCD format.

Low clamp value for channel 1. The channel output will not be allowed to go below this value (in scaled units) regardless of the data sent to the module. Clamp values are limited to

32767 in binary format; +7999 in BCD format.

High clamp value for channel 1. The channel output will not be allowed to go above this value (in scaled units) regardless of the data sent to the module. Clamp values are limited to

32767 in binary format; +7999 in BCD format.

Maximum ramp rate. If this field is not 0, the module will limit the maximum rate of change for this channel to be a percentage of the scaled range of the module. Legal values are from 1 to 200% of full scale/second.

Word 15 continued Bit 15 (17)

Words 17 thru 22 Same as words 11 thru 16 but for channel 2.

Words 23 thru 28 Same as words 11 thru 16 but for channel 3.

Words 29 thru 34 Same as words 11 thru 16 but for channel 4.

Words 35 thru 40 Same as words 11 thru 16 but for channel 5.

Publication 1771ĆUM127B-EN-P - December 2002

Word 16

Bit 12 (14) Constant = 0

Reset state. This field controls what the channel will output if the I/O reset line is asserted:

Bits 13-14

(15-16)

00 binary = last state; 01 binary = minimum output; (example: < -10V, < 4mA) 10 binary = maximum output; (example: > 10V, > 22mA) 11 binary = user reset value.

Alarm enable. If set to 1, the module reports high clamp, low clamp and rate limit. If 0, these warnings are suppressed.

Bits 00-15

(00-17)

Reset value. If the user selects the channel to go to a user reset value upon I/O reset, the value in scaled units is entered here. Otherwise, set to 0.

Rockwell Automation 1771-N User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual