Rockwell Automation 1746-NI16V User Manual

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Page 1

SLC 500™ Analog Input Modules

Catalog Numbers 1746-NI16I and 1746-NI16V

User Manual

Page 2

Important User Information

Because of the variety of uses for the products described in this publication, those responsible for the application and use of this control equipment must satisfy themselves that all necessary steps have been taken to assure that each application and use meets all performance and safety requirements, including any applicable laws, regulations, codes and standards.

The illustrations, charts, sample programs and layout examples shown in this guide are intended solely for purposes of example. Since there are many variables and requirements associated with any particular installation, Allen-Bradley does not assume responsibility or liability (to include intellectual property liability) for actual use based upon the examples shown in this publication.

Allen-Bradley publication SGI-1.1, Safety Guidelines for the

Application, Installation and Maintenance of Solid-State Control

(available from your local Allen-Bradley office), describes some important differences between solid-state equipment and electromechanical devices 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 manual we use notes to make you aware of safety considerations:

ATTENTION

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

Attention statements help you to:

identify a hazard

•

avoid a hazard

•

recognize the consequences

•

IMPORTANT

ControlNet is a trademark of Rockwell Automation

SLC 500 is a trademark of Rockwell Automation.

RSLogix 500 is a trademark of Rockwell Automation.

Belden is a trademark of Belden, Inc.

Identifies information that is critical for successful application and understanding of the product.

Page 3

Overview

Preface

Who Should Use this Manual. . . . . . . . . . . . . . . . . . . . . . . P-1

Purpose of this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . P-1

Contents of this Manual . . . . . . . . . . . . . . . . . . . . . . . . P-2

Related Documentation . . . . . . . . . . . . . . . . . . . . . . . . P-3

Common Techniques Used in this Manual . . . . . . . . . . . . . P-4

Allen-Bradley Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . P-4

Local Product Support . . . . . . . . . . . . . . . . . . . . . . . . . P-4

Technical Product Assistance . . . . . . . . . . . . . . . . . . . . P-4

Your Questions or Comments on this Manual . . . . . . . . P-4

Chapter 1

General Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Hardware Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

General Diagnostic Features . . . . . . . . . . . . . . . . . . . . . 1-3

System Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

System Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

Module Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Module Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

Quick Start for Experienced Users

Installation and Wiring

Chapter 2

Required Tools and Equipment . . . . . . . . . . . . . . . . . . . . . 2-1

Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

Chapter 3

Hazardous Location Considerations . . . . . . . . . . . . . . . . . . 3-1

Environnements dangereux . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Electrostatic Damage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

1746-NI16 Power Requirements . . . . . . . . . . . . . . . . . . . . . 3-3

Module Location in Chassis . . . . . . . . . . . . . . . . . . . . . . . . 3-3

Modular Chassis Considerations . . . . . . . . . . . . . . . . . . 3-3

Fixed Expansion Chassis Considerations . . . . . . . . . . . . 3-3

General Considerations . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Compliance to European Union Directives . . . . . . . . . . . . . 3-6

EMC Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6

Module Installation and Removal . . . . . . . . . . . . . . . . . . . . 3-7

Terminal Block Removal . . . . . . . . . . . . . . . . . . . . . . . 3-7

Module Installation Procedure . . . . . . . . . . . . . . . . . . . 3-8

Module Removal Procedure . . . . . . . . . . . . . . . . . . . . . 3-8

Terminal Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-9

Terminal Block

Pre wired Cables and Terminal Blocks . . . . . . . . . . . . . 3-9

Wiring Single-Ended Inputs . . . . . . . . . . . . . . . . . . . . . 3-10

Wiring Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12

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Table of Contents ii

Preliminary Operating Considerations

Input Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13

Transducer Source Impedance . . . . . . . . . . . . . . . . . . . 3-13

Wiring Input Devices to the 1746-NI16 . . . . . . . . . . . . . 3-13

Chapter 4

Module ID Code . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

Class 1 and Class 3 Interface . . . . . . . . . . . . . . . . . . . . . . . 4-2

Module Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Class 1 Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

Class 3 Memory Map . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Output Image - Configuration Words . . . . . . . . . . . . . . 4-5

Input Image - Data Words and Status Words. . . . . . . . . 4-5

Module Update Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

Channel Filter Frequency Selection . . . . . . . . . . . . . . . . . . 4-9

Channel Frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

Response to Slot Disabling . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Input Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Output Response . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11

Channel Configuration, Data, and Status

Chapter 5

Channel Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

Output Image Channel Configuration Procedure . . . . . . . . 5-2

Channel Configuration Word . . . . . . . . . . . . . . . . . . . . 5-3

Select Channel Enable (Bit 15) . . . . . . . . . . . . . . . . . . . 5-4

Select Channel Filter Frequency (Bits 14 through 12). . . 5-4

Select Calibration Mode (Bits 11 through 9) . . . . . . . . . 5-5

Select Data Format (Bits 8 through 6) . . . . . . . . . . . . . . 5-6

Select Input Type (Bits 5 and 4) . . . . . . . . . . . . . . . . . . 5-6

Unused Bit (Bit 3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-6

Class 1 Handshaking (Bit 2) . . . . . . . . . . . . . . . . . . . . . 5-7

Class 1 Data or Status Configuration (Bits 1 and 0) . . . . 5-7

Input Image - Channel Data Word . . . . . . . . . . . . . . . . . . . 5-8

Scaling the Channel Data Word . . . . . . . . . . . . . . . . . . . . . 5-10

Data Type Descriptions . . . . . . . . . . . . . . . . . . . . . . . . 5-10

Scaling Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12

Engineering Units to Real Units . . . . . . . . . . . . . . . . . . 5-13

Scaled-for-PID to Real Units . . . . . . . . . . . . . . . . . . . . . 5-14

Proportional Counts to Real Units. . . . . . . . . . . . . . . . . 5-14

1746-NI4 Data Format Units to Real Units . . . . . . . . . . . 5-15

User-Defined Scaling Data Format to Real Units . . . . . . 5-15

Channel Status Checking . . . . . . . . . . . . . . . . . . . . . . . . . . 5-16

Class 1 Status Word. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-18

Class 3 Status Word. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19

Input Word Bit Definitions . . . . . . . . . . . . . . . . . . . . . . . . 5-20

Error Conditions (Bits 15 through 13) . . . . . . . . . . . . . . 5-20

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Module Diagnostics and Troubleshooting

Table of Contents iii

Filter Frequency (Bits 12 through 10) . . . . . . . . . . . . . . 5-20

Calibrate Channel Status (Bits 9 through 7) . . . . . . . . . . 5-21

Class 1 Handshaking (Bit 6) . . . . . . . . . . . . . . . . . . . . . 5-21

Class 3 Data Format (Bits 6 through 4) . . . . . . . . . . . . . 5-21

Class 1 Data Format (Bits 5 and 4) . . . . . . . . . . . . . . . . 5-21

Input Type (Bits 3 and 2) . . . . . . . . . . . . . . . . . . . . . . . 5-22

Class 1 Data or Status Configuration (Bits 1 and 0) . . . . 5-22

Chapter 6

Module operation vs. Channel Operation . . . . . . . . . . . . . . 6-1

Power-Up Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Channel Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

Invalid Channel Configuration . . . . . . . . . . . . . . . . . . . 6-2

Out-Of-Range Detection. . . . . . . . . . . . . . . . . . . . . . . . 6-2

Open-Circuit Detection . . . . . . . . . . . . . . . . . . . . . . . . 6-3

LED Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

LED State Tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

Module Status LED (Green) . . . . . . . . . . . . . . . . . . . . . 6-4

Channel Status LEDs (Green) . . . . . . . . . . . . . . . . . . . . 6-5

Error Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

Troubleshooting Flowchart . . . . . . . . . . . . . . . . . . . . . . . . 6-6

Replacement parts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Contacting Allen-Bradley . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

Application Examples

Specifications

Chapter 7

Operating Classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Class 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Class 3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Class 1 Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

Ladder Files. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

Data File N7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

Class 3 Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

Ladder File 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19

Data File N7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-21

Appendix A

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

Physical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . A-2

Environmental Specifications . . . . . . . . . . . . . . . . . . . . . . . A-2

Input Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A-3

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Table of Contents iv

Configuration Worksheet

Two’s Complement Binary Numbers

Calibration

Appendix B

Appendix C

Positive Decimal Values . . . . . . . . . . . . . . . . . . . . . . . . C-1

Negative Decimal Values . . . . . . . . . . . . . . . . . . . . . . . C-2

Appendix D

Calibration Sequence. . . . . . . . . . . . . . . . . . . . . . . . . . . . . D-1

Glossary

Index

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Preface

Read this preface to familiarize yourself with the rest of the manual. This preface covers the following topics:

who should use this manual

•

the purpose of this manual

•

contents of this manual

•

Purpose of this Manual

Use this manual if you are responsible for the design, installation, programming, or maintenance of an automation control system that uses Allen-Bradley small logic controllers.

You should have a basic understanding of SLC 500™ products. You should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control your application.

If you do not, contact your local Allen-Bradley representative for the proper training before using this product.

This manual is a learning and reference guide for the 1746-NI16 Analog Input Module. It contains the information you need to install, wire, and configure the module. It also provides diagnostic and troubleshooting information and application examples.

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Preface 2

Contents of this Manual

Chapter Title Content

Preface Describes the purpose, background, and scope

of this manual. Also specifies the audience for whom this manual is intended and gives directions to using Allen-Bradley support services. Provides listing of related documentation.

1 Overview Provides a hardware and system overview.

Explains and illustrates the theory behind the input module.

2 Quick Start for

Experienced Users

3 Installation and

Wiring

4 Preliminary Operating

Considerations

5 Channel

Configuration Data and Status

6 Module Diagnostics

and Troubleshooting

7 Application Examples Examines both basic and supplementary

Appendix A Specifications Provides physical, electrical, environmental, and

Appendix B Configuration

Worksheet

Appendix C Two’s Complement

Binary Numbers

Serves as a Quick Start Guide for the experienced user.

Provides installation information and wiring guidelines.

Gives you the background information you need to understand how to address and configure the module for optimum operation as well as how to make changes once the module is in a run state.

Examines the channel configuration word and the channel status word, bit by bit, and explains how the module uses configuration data and generates status during operation.

Explains how to interpret and correct problems that may occur while using the module.

applications and gives examples of the ladder logic necessary to achieve the desired result.

functional specifications for the module. Provides a worksheet to help configure the

module for operation. Describes the two’s compliment binary number

system.

Publication 1746-UM001A-US-P

Appendix D Calibration Describes how to calibrate the 1746-NI16

module.

Glossary Lists key terms and abbreviations.

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Preface 3

Common Techniques Used in this Manual

Allen-Bradley Support

The following conventions are used throughout this manual:

Bulleted lists such as this one provide information, not

•

procedural steps. Numbered lists provide sequential steps or hierarchical

•

information. Text in

•

Key names appear in bold, capital letters within brackets (for

•

example,

Allen-Bradley offers support services worldwide, with over 75 Sales/ Support Offices, 512 authorized Distributors and 260 authorized Systems Integrators located throughout the United States alone, plus Allen-Bradley representatives in every major country in the world.

this f o nt

[ENTER]

indicates words or phrases you should type.

Local Product Support

Contact your local Allen-Bradley representative for:

sales and order support

•

product technical training

•

warranty support

•

support service agreements

•

Technical Product Assistance

If you need to contact Allen-Bradley for technical assistance, please review the information in the Troubleshooting chapter first. Then call your local Allen-Bradley representative.

Your Questions or Comments on this Manual

If you find a problem with this manual, please notify us of it on the enclosed Publication Problem Report.

If you have any suggestions for how this manual could be made more useful to you, please contact us at the address below:

Allen-Bradley Control and Information Group Technical Communication, Dept. A602V, T122 P.O. Box 2086 Milwaukee, WI 53201-2086

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Chapter

Overview

This chapter describes the 1746-NI16 analog input module and explains how the SLC 500 processor gathers analog input data from the module. Included is information about:

the module’s hardware and diagnostic features

•

an overview of system operation

•

General Description

The module receives and stores digitally converted analog data into its image table for retrieval by all fixed and modular SLC 500 processors. The modules, 1746-NI16V and 1746-NI16I, support connections for up to 16 voltage or current analog sensors.

The 1746-NI16 is a multi-class (Class 1 or Class 3) single-slot module.

(1)

Class 1 Class 3 configuration utilizes 32 input words and 32 output words. Fixed and SLC 5/01 processors can only operate as Class 1. When the module is used in a remote I/O chassis with a 1747-ASB, it can only operate in Class 1 mode. The SLC 5/02, SLC 5/03, SLC 5/04 and SLC 5/05 processors can be configured for either Class 1 or Class 3. When the module is used in a remote ControlNet™ chassis with a 1747-ACN(R), it can also operate in either Class 1 or Class 3 mode. Operate the module in Class 3 mode whenever possible.

The 16 high-impedance input channels can be wired as single-ended inputs. The module provides a direct interface to the following input types:

configuration utilizes 8 input words and 8 output words.

±10V dc

•

1 to 5V dc

•

0 to 5V dc

•

0 to 10V dc

•

0 to 20 mA

•

4 to 20 mA

•

20 mA

•

0 to 1 mA

•

(1)

Requires use of block transfer in a remote configuration.

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1-2 Overview

The data presented to the processor can be configured as:

Engineering Units

•

Scaled-for-PID

•

Proportional Counts (-32,768 to +32,767 range)

•

Proportional Counts with User Defined Range (Class 3 Only)

•

1746-NI4 Data Format

•

Each input channel also provides open-circuit, out-of-range, and invalid configuration indication via the LED’s. These conditions are also displayed in the channel status word.

Hardware Features

The module fits into any slot, except the processor slot (0), in either an SLC 500 modular system or an SLC 500 fixed system expansion chassis (1746-A2).

Channel Status LEDs (Green)

Module Status LED (Green)

Removable Terminal Block

The module contains a removable terminal block, providing connection for 16 analog input channels, which are specifically designed to interface with analog current and voltage input signals. The channels can only be wired as single-ended inputs. There are no output channels on the module. The module is configured via the user program. The following graphic displays the main hardware features.

Label

Cable Tie Slots

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Self-locking Tabs

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Hardware Feature Function

Overview 1-3

Channel Status LED Indicators

Module Status LED Displays module operating and fault status. Side Label (Nameplate) Provides module information. Removable Terminal

Block Door Label Permits easy terminal identification. Cable Tie Slots Secures and routes wiring from the module. Self-Locking Tabs Secures module in the chassis slot.

Displays channel operating and fault status.

Provides physical connection to input devices.

General Diagnostic Features

The 1746-NI16 module contains diagnostic features to help identify the source of problems that may occur during power-up or during normal channel operation. These power-up and channel diagnostics are explained in Chapter 6, Module Diagnostics and Troubleshooting.

The module communicates to the SLC 500 processor through the parallel backplane interface and receives power from the SLC 500 power supply through the backplane. The +5V dc backplane supply powers the SLC circuitry and the +24V dc backplane supply powers the module analog circuitry. No external power supply is required. You may install as many 1746-NI16 analog modules in a 1746 chassis as the chassis power supply can support.

System Overview

The NI16I can only receive current inputs. The NI16V can only receive voltage inputs.

System Operation

At power-up, the module performs a check of its internal circuits, memory, and basic functions. During this time, the module status LED remains off. If no faults are found during the power-up diagnostics, the module status LED is turned ON.

After power-up checks are complete, the module waits for valid channel configuration data from the SLC ladder logic program (channel status LEDs off). After configuration data is written to one or more channel configuration words and the channel enable status bits are set, the channel status LEDs are turned ON and the module continuously converts the analog input to a value within the range selected in the configuration word.

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1-4 Overview

Each time a channel is read by the module, that data value is tested by the module for a fault condition (i.e., open-circuit, over-range, and under-range). If a fault condition is detected, a unique bit is set in the channel status word and the channel status LED blinks.

The SLC processor reads the converted analog data from the module at the end of the program scan or when commanded by the ladder program. If the processor and module determine that the backplane data transfer was made without error, the data is used in your ladder program. A graphic representation of this is shown below.

Data Transfer Between the Module and Processor (shown for one channel)

Voltage or Current Analog Channel Input

1746-NI16 Analog Input Module

Channel Data Word

Channel Status Word

Channel Configuration Word from Ladder Program

SLC 500 Processor

Module Operation

The 1746-NI16 module’s input circuitry consists of four analog-to-digital (A/D) converters. Each of the 4 A/D converters multiplex 4 inputs for a total of 16 single-ended inputs.

The A/D converters read the selected input signal and convert it to a digital value. The multiplexer sequentially switches each input channel to the module’s A/D converter. Multiplexing provides an economical means for a single A/D converter to convert multiple analog signals. However, multiplexing also affects the speed at which an input signal can change and still be detected by the converter.

Publication 1746-UM001A-US-P

Module Calibration

The 1746-NI16 module is already factory calibrated and ready for use. Although factory calibration is suitable for most applications, the module can be calibrated by the user. See Appendix D for more information on calibration.

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Chapter

Quick Start for Experienced Users

This chapter can help you to get started using the 1746-NI16 analog input module. The procedures here are based on the assumption that the user has an understanding of SLC 500™ products. The user should understand electronic process control and be able to interpret the ladder logic instructions required to generate the electronic signals that control the application.

Because this chapter is a start-up guide for experienced users, this chapter does not contain detailed explanations about the procedures listed. It does, however, reference other chapters in this book where you can get more information about applying the procedures described in each step. It also references other documentation that may be helpful if you are unfamiliar with programming techniques or system installation requirements.

Required Tools and Equipment

If you have any questions or are unfamiliar with the terms used or concepts presented in the procedural steps, always read the referenced chapters and other recommended documentation before trying to apply the information.

This chapter will:

tell you what equipment you need

•

explain how to install and wire the module

•

show you how to set up one channel for analog input

•

examine the state of the LEDs at normal startup

•

examine the channel status word

•

Have the following tools and equipment ready:

medium blade screwdriver

•

medium cross-head screwdriver

•

analog input device

•

cable for wiring inputs to module

•

SLC processor and power supply installed in chassis

•

analog input module (1746-NI16)

•

programming device and software

•

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2-2 Quick Start for Experienced Users

Procedures

1. Check the contents of shipping box. Reference

Unpack the shipping box making sure that the contents include:

analog input module (Catalog Number 1746-NI16)

•

removable terminal block (factory-installed)

•

Installation Instructions

•

If the contents are incomplete, call your local Allen-Bradley representative for assistance.

2. Ensure that your chassis and power supply support the 1746-NI16 module. Reference

If you are installing the module in a hazardous location, read “Hazardous Location Considerations” on page 3-1. Review the power requirements of your system to ensure that your chassis supports the module:

If you are combining a 1746-NI16 module with another I/O module in a fixed controller, refer to the I/O

•

module compatibility table found in Chapter 3. For modular style systems, calculate the total load on the system power supply using the procedure

•

described in the the

SLC 500 Family System Overview

The 1746-NI16 backplane current consumption is 125 mA at 5V dc and 75 mA at 24V dc.

•

SLC Installation & Operation Manual for Modular Style Controllers

(publication 1747-2.30).

(publication 1747-6.2) or

Chapter 3

(Installation and

Wiring)

Appendix A

(Specifications)

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Quick Start for Experienced Users 2-3

3. Insert the 1746-NI16 module into the chassis. Reference

ATTENTION

Never install, remove, or wire modules with power applied to the chassis or devices wired to the module.

Make sure system power is off; then insert the module into your 1746 chassis. In this example procedure, local slot 1 is selected. Any slot may be used except 0.

Chapter 3

(Installation and

Wiring)

Top and Bottom Module Releases

Card Guide

4. Connect sensor cable. Reference

Connect sensor cable to the module’s terminal block.

Important:

Follow these guidelines when wiring the module:

Use shielded communication cable (Belden™ 8761) and keep length as short as possible.

•

Connect only one end of the cable shield to earth ground.

•

Connect all the shields to the earth ground at the SLC 500™ chassis mounting tab.

•

Single-ended source commons may be jumpered together at the terminal block.

•

Channels are not isolated from each other. All analog commons are connected together internally.

•

Common mode voltage range is ±10.25 volts. The voltage between any two terminals must be less than

•

20.5 volts. The module does not provide power for the analog input transmitters or sensors.

•

Use a power supply that matches the transmitter (sensor) specifications.

•

Terminal Bl ock

IN 0 IN 2

IN 4 IN 6

Analog Com

IN 1

IN 3 IN 5 IN 7

Analog Com

Sensor Cable

Chapter 3

(Installation and

Wiring)

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2-4 Quick Start for Experienced Users

5. Configure the system. Reference

Configure your system I/O for the particular slot the 1746-NI16 is in (slot 1 in this example). Enter the module ID code. The ID code is for Class 1 interface or Class 3 interface. See Chapter 4 for more information on Class 1 and Class 3 interfaces.

Chapter 4

(Preliminary

Operating

Considerations)

Important:

Not all programming software supports configuration for Class 3 operation.

Advanced Programming Software (APS) supports Class 3 configuration, after entering the ID code.

•

SLC 500 A.I. Series Programming Software supports Class 3 configuration, after entering the ID code.

•

RSLogix 500, version 1.30 or later, supports Class 3 configuration, after entering the ID code.

•

Earlier versions of RSLogix 500 only supports configuration for Class 1 operation. Contact Rockwell

•

Software for information on upgrading your software.

Appendix C

(Converting from

1746-NI4 or 1746-NI8 to

1746-NI16)

Device’s user

manual.

6. Determine the operating parameters. Reference

Determine the operating parameters for channel 0. This example shows the channel 0 configuration word. The module is in slot 1. The default configuration word is all zeros.

1115 3 214 13 12 10 9 8 76 54 10

01 0 0010 00 0 00 00 00

Bit Number

Channel 0

Chapter 4

(Preliminary Openin g

Considerations)

Chapter 5

(Channel

Configuration,

• Class 1, Data or Status Configuration

• Class 1 Handshaking

• Not Used

• Input Type: ± 10 V dc

• Data Format: Engineering Units

• Calibration

• Filter Frequency: 20 Hz

• Channel Enable: Enabled

Data and Status)

Appendix B

(1746-NI16

Configuration

Worksheet)

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1746-NI16 Module Output Image - Channel Configuration

Class 1 Class 3

O:1.0 channel 0 configuration word bit-mapped field • • O:1.1 channel 1 configuration word bit-mapped field • • O:1.2 channel 2 configuration word bit-mapped field • • O:1.3 channel 3 configuration word bit-mapped field • • O:1.4 channel 4 configuration word bit-mapped field • • O:1.5 channel 5 configuration word bit-mapped field • • O:1.6 channel 6 configuration word bit-mapped field • • O:1.7 channel 7 configuration word bit-mapped field • • O:1.8 channel 8 configuration word bit-mapped field • O:1.9 channel 9 configuration word bit-mapped field • O:1.10 channel 10 configuration word bit-mapped field • O:1.11 channel 11 configuration word bit-mapped field • O:1.12 channel 12 configuration word bit-mapped field • O:1.13 channel 13 configuration word bit-mapped field • O:1.14 channel 14 configuration word bit-mapped field • O:1.15 channel 15 configuration word bit-mapped field • O:1.16 lower scale limit range 0 16-bit integer • O:1.17 upper scale limit range 0 16-bit integer • O:1.18 lower scale limit range 1 16-bit integer • O:1.19 upper scale limit range 1 16-bit integer • O:1.20 lower scale limit range 2 16-bit integer • O:1.21 upper scale limit range 2 16-bit integer • O:1.22 lower scale limit range 3 16-bit integer • O:1.23 upper scale limit range 3 16-bit integer •

Quick Start for Experienced Users 2-5

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2-6 Quick Start for Experienced Users

7. Program the configuration. Reference

Do the programming necessary to establish the new configuration word setting in the previous step.

1. Create integer file N10. Integer file N10 should contain one element for each channel used. (For this example we only need one, N10:0.)

2. Enter the configuration parameters from step 6 for channel 0 into integer N10:0.

3. Program an instruction in your ladder logic to copy the contents of N10:0 to output word O:1.0.

DATA FILE N10

Offset 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0 N10:0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0

First Pass Bit

S:1

] [

Initialize 1746-NI16

COP COPY FILE Source #N10:0 Dest #O:1.0 Length 1

On powerup, the first pass bit (S:1/15) is set for one scan, enabling the MOV instruction that transfers the channel configuration word 0. This configures and enables channel 0.

Chapter 7

(Application Examples)

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Quick Start for Experienced Users 2-7

8. Write the ladder program. Reference

Write the remainder of the ladder logic program that specifies how your analog input data is processed for your application. In this procedure the module is located in slot 1.

1112131415 910 8 67450123

0000000000000000

Bit Number

Channel 0 data Word (Variable input data)

1746-NI16 Module Input Image - Data Word

I:1.0 Channel 0 data word

I:1.1 Channel 1 data word

I:1.2 Channel 2 data word

I:1.3 Channel 3 data word

I:1.4 Channel 4 data word

I:1.5 Channel 5 data word

I:1.6 Channel 6 data word

(Channel Configuration,

(Application Examples)

Your programming device’s

(1)

Class 1

14-bit integer (bits 1 and 0 = 00)

Chapter 5

Data and Status)

Chapter 7

user manual.

Class 3

(2)

16-bit integer

(2)

16-bit integer

(2)

16-bit integer

(2)

16-bit integer

(2)

16-bit integer

(2)

16-bit integer

(2)

16-bit integer

I:1.7 Channel 7 data word

I:1.8 Channel 8 data word

I:1.9 Channel 9 data word

I:1.10 Channel 10 data word

I:1.11 Channel 11 data word

I:1.12 Channel 12 data word

I:1.13 Channel 13 data word

I:1.14 Channel 14 data word

I:1.15 Channel 15 data word

(1) In Class 1, the error is ± 3 LSB of the Class 3 resolution. (2) Bits 1 and 0 of the data word are overwritten in Class 1 to indicate data from Channels 0 to 7 (3) Bits 1 and 0 of the data word are overwritten in Class 1 to indicate data from Channels 8 to 15

14-bit integer (bits 1 and 0 = 00)

14-bit integer (bits 1 and 0 = 01)

(2)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

(3)

16-bit integer

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2-8 Quick Start for Experienced Users

9. Go through the system start-up procedure. Reference

Apply power. Download your program to the SLC 500 processor and put the controller into Run mode. During a normal start up, the module status LED and any enabled channel status LED turn on.

Chapter 6

(Module Diagnostics and

Troubleshooting)

INPUT

0-3 4-7

Channel Status LEDs

Module Status LED

ANALOG MODULE

8-11 12-15

10. Check that the module is operating correctly. Reference

(Optional) If the Module Status LED is off, or if the Channel 0 LED is off or blinking, refer to Chapter 6. Class 3 Interface - Monitor the status of input channel 0 to determine its configuration setting and operational status. This is useful for troubleshooting when the blinking channel LED indicates that an error

Chapter 5

(Channel Configuration,

Data and Status)

has occurred. The example below shows the Class 3 status word for channel 0 with no errors.

Chapter 6

(Module Diagnostics and

Troubleshooting)

12 415 14 13 11 10 9 87 65 32

0 0111 10 0 00 00 00

Publication 1746-UM001A-US-P

Bit Number

Channel 0 Status Word (I:1.8)

• Class 1 Data or Status Configuration

• Input Type

• Data Format

• Calibrate Channel Status

• Filter Frequency

• Error Conditions

Chapter 7

(Application Examples)

Page 23

Installation and Wiring

This chapter tells you how to:

avoid electrostatic damage

•

determine the chassis power requirement for the module

•

choose a location for the module in the SLC chassis

•

install the module

•

wire the module’s terminal block

•

wire input devices

•

Chapter

Hazardous Location Considerations

This equipment is suitable for use in Class I, Division 2, Groups A, B, C, D or non-hazardous locations only. The following ATTENTION statement applies to use in hazardous locations.

ATTENTION

EXPLOSION HAZARD

Substitution of components may impair suitability

•

for Class I, Division 2.

Do not replace components or disconnect

•

equipment unless power has been switched off.

Do not connect or disconnect components unless

•

power has been switched off.

This product must be installed in an enclosure.

•

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3-2 Installation and Wiring

Environnements dangereux

Cet équipement est conçu pour être utilisé dans des environnements de Classe 1, Division 2, Groupes A, B, C, D ou non dangereux. La mise en garde suivante s’applique à une utilisation dans des environnements dangereux.

MISE EN GARDE

DANGER D’EXPLOSION

La substitution de composants peut rendre

•

cet équipement impropre à une utilisation en environnement de Classe 1, Division 2.

Ne pas remplacer de composants ou

•

déconnecter l'équipement sans s'être assuré que l'alimentation est coupée.

Ne pas connecter ou déconnecter des

•

composants sans s'être assuré que l'alimentation est coupée.

Ce produit doit être installé dans une

•

armoire.

Electrostatic Damage

Electrostatic discharge can damage semiconductor devices inside this module if you touch backplane connector pins. Guard against electrostatic damage by observing the following precautions.

ATTENTION

Electrostatic discharge can degrade performance or cause permanent damage. Handle the module as stated below.

Wear an approved wrist strap grounding device when handling

•

the module. Touch a grounded object to rid yourself of electrostatic charge

•

before handling the module. Handle the module from the front, away from the backplane

•

connector. Do not touch backplane connector pins. Keep the module in its static-shield bag when not in use, or

•

during shipment.

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Installation and Wiring 3-3

1746-NI16 Power Requirements

Module Location in Chassis

The 1746-NI16 module receives its power through the SLC 500™ chassis backplane from the fixed or modular +5V dc/+24V dc chassis power supply. The +5V dc backplane supply powers the SLC circuitry, and the +24V dc backplane supply powers the module analog circuitry. The maximum current drawn by the module is shown in the table below.

5V dc Amps 24V dc Amps

0.125 0.075

When you are using a modular system configuration, add the values shown in the table above to the requirements of all other modules in the SLC chassis to prevent overloading the chassis power supply.

When using a fixed system controller, see “Fixed Expansion Chassis Considerations” on page 3-3.

Modular Chassis Considerations

Place your 1746-NI16 module in any slot of an SLC 500 modular, or modular expansion chassis, except for the extreme left slot (slot 0) in the first chassis. This slot is reserved for the processor or adapter modules.

ATTENTION

For applications using the upper limit of the operating temperature range, the 1746-NI16 module (or multiple 1746-NI16 modules) should be placed in the right most slot(s) of the chassis. The specification for operating temperature is:

Operating Temperature Range

0°C to 60°C (32°F to 140°F) in any slot except slot 0

Fixed Expansion Chassis Considerations

The chart on page 3-4 depicts the range of current combinations supported by the fixed I/O expansion chassis. To use it, first find the backplane current draw and operating voltage for both of the modules you plan to use in the chassis. The table on page 3-4 shows these specifications.

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3-4 Installation and Wiring

OA16 and IA16 (0, 455)

OW16 and IA16 (180, 255)

Plotted from example shown on page 3-5.

Current (mA) at 5V dc

Current (mA) at 24V dc

Next, plot each of the currents on the chart. If the point of intersection falls within the operating region, your combination is valid. If not, your combination cannot be used in a 2-slot, fixed I/O chassis. See the example on page 3-5.

450

400

350

300

250

200

150

100

50 100 150 200

Module Current Draw – Power Supply Loading

I/O Module 5V (mA) 24V (mA) I/O Module 5V (mA) 24V (mA) I/O Module 5V (mA) 24V (mA)

BAS 150 40 IN16 85 0 NT4 60 40 BASn 150 125 INT4 110 0 OA8 185 0 BLM10000 IO43025OA163700 BTM 110 85 IO8 60 45 OAP12 370 0 DCM 360 0 IO12 90 70 OB6EI 46 0 FIO4I 55 150 IO12DC 80 60 OB8 135 0 FIO4V55120ITB16850 OB162800 HS 300 0 ITV16 85 0 OB16E 135 0 HSTP1 200 0 IV8 50 0 OB32, series D 190 0 IA4 35 0 IV16 85 0 OB32E 190 0 IA8 50 0 IV32, series D 50 0 OBP8 135 0 IA16 85 0 KE 150 40 OBP16 250 0 IB8 50 0 KEn 150 125 OG16 180 0 IB16 85 0 NI4 25 85 OV8 135 0 IB32, series D 50 0 NI8 200 100 OV16 270 0 IC16 85 0 NI16 125 75 OV32, series D 190 0 IG16 140 0 NIO4I 55 145 OVP16 250 0 IH16 85 0 NIO4V 55 115 OW16 170 180 IM4 35 0 NO4I 55 195 OW4 45 45 IM8 50 0 NO4V 55 145 OW8 85 90 IM16 85 0 NR4 50 50 OX8 85 90

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Installation and Wiring 3-5

Fixed Chassis Example

The following example shows how to use the chart and table on page 3-4 to determine if the module combination of an 1746-IN16 and 1746-NI16 is supported by the fixed I/O chassis.

1. Find the current draws of both modules in the table. IN16 = 85 mA at 5V dc and 0 mA at 24V dc NI16 = 125 mA at 5V dc and 75 mA at 24V dc

2. Add the current draws of both modules at 5V dc. 85 mA + 125 mA = 210 mA

3. Plot this point on the chart above (210 mA at 5V dc).

4. Add the current draws of both modules at 24V dc.

0 mA + 75 mA = 75 mA

5. Plot this point on the chart above (75 mA at 24V dc).

The resulting point of intersection is marked with an “x” on the chart above, showing that this combination falls within the operating region of the fixed I/O chassis.

IMPORTANT

When using the table, be aware that there are certain conditions that affect the compatibility characteristics of the BASIC module (BAS) and the DH-485/RS-232C module (KE).

When you use the BAS module or the KE module to supply power to a 1747-AIC Link Coupler, the Link Coupler draws its power through the module. The higher current drawn by the AIC at 24V dc is calculated and recorded in the table for the modules identified as BASn (BAS networked) or KEn (KE networked). Make sure to refer to these modules if your application uses the BAS or KE module in this way.

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3-6 Installation and Wiring

General Considerations

Most applications require installation in an industrial enclosure to reduce the effects of electrical interference. Analog inputs are highly susceptible to electrical noise. Electrical noise coupled to the analog inputs reduces the performance (accuracy) of the module.

Group your modules to minimize adverse effects from radiated electrical noise and heat. Consider the following conditions when selecting a slot for the analog input module. Position the module:

in a slot away from sources of electrical noise such as

•

hard-contact switches, relays, and AC motor drives away from modules which generate significant radiated heat,

•

such as the 32-point I/O modules (series C or earlier)

In addition, route shielded analog input wiring away from any high-voltage I/O wiring.

Compliance to European Union Directives

This product is approved for installation within the European Union and EEA regions. It has been designed and tested to meet the following directives.

EMC Directive

The 1746-NI16 analog input module is tested to meet Council Directive 89/336/EEC Electromagnetic Compatibility (EMC) and the following standards, in whole or in part, documented in a technical construction file:

EN 50081-2

•

EMC - Generic Emission Standard, Part 2 - Industrial Environment

EN 50082-2

•

EMC - Generic Immunity Standard, Part 2 - Industrial Environment

This product is intended for use in an industrial environment.

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Installation and Wiring 3-7

Module Installation and Removal

When installing the module in a chassis, it is not necessary to remove the terminal block from the module. However, if the terminal block is removed, use the write-on label located on the side of the terminal block to identify the module location and type.

SLOT

MODULE

•

RACK

Terminal Block Removal

ATTENTION

Remove power before removing or inserting this module. When you remove or insert a module with power applied, an electrical arc may occur. An electrical arc can cause personal injury or property damage by:

sending an erroneous signal to your system’s field

•

devices, causing unintended machine motion. causing an explosion in a hazardous environment

•

Electrical arcing causes excessive wear to contacts on both the module and its mating connector. Worn contacts may create electrical resistance.

To remove the terminal block:

1. Loosen the two terminal block release screws.

2. Grasp the terminal block at the top and bottom and pull

outward and down.

Terminal Block Release Screws

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3-8 Installation and Wiring

Module Installation Procedure

1. Read the “Module Location in Chassis” section beginning on page 3-3.

2. Align the circuit board of the analog input module with the card guides located at the top and bottom of the chassis.

3. Slide the module into the chassis until both top and bottom retaining clips are secured. Apply firm, even pressure on the module to attach it to its backplane connector. Never force the module into the slot.

4. Cover all unused slots with the Card Slot Filler, catalog number 1746-N2.

Top and Bottom Module Release(s)

Card Guide

Module Removal Procedure

1. Press the releases at the top and bottom of the module and slide the module out of the chassis slot.

2. Cover all unused slots with the Card Slot Filler, catalog number 1746-N2.

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Installation and Wiring 3-9

Terminal Wiring

The 1746-NI16 module contains an 18-position, removable terminal block. The terminal pin-out is shown below.

ATTENTION

Disconnect power to the SLC before attempting to install, remove, or wire the removable terminal wiring block.

To avoid cracking the removable terminal block,

alternate the removal of the slotted terminal block release screws.

Terminal Block

(Terminal Block Spare Part Catalog Number 1746-RT25G)

IN 0

IN 2

IN 4

IN 6

Analog Com

IN 8

IN 10

IN 12

IN 14

IN 1

IN 3 IN 5

IN 7

Analog Com

IN 9

IN 11

IN 13

IN 15

Terminal Block Release Screw Maximum Torque = 0.7 to 0.9 Nm (6 to 8 in-lbs.)

Pre wired Cables and Terminal Blocks

The following 1492 cables and terminal blocks are available to assist in wiring the 1746-NI16 module:

Allen-Bradley Prewired Cables

Allen-Bradley User Terminal Blocks

1492-ACAB005A46, 0.5m (1.6 ft.) 1492-ACAB010A46, 1.0 m (3.3 ft.) 1492-ACAB025A46, 2.5 m (8.2 ft.) 1492-ACAB050A46, 5.0 m (16.4 ft.)

1492-AIFM8-3 1492-AIFM16-F-3

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3-10 Installation and Wiring

V T

Wiring Single-Ended Inputs

1746-NI16V

Channel 0

oltage

ransmitter

Channel 2

oltage

ransmitter

Channel 4

oltage

ransmitter

Channel 6 Voltage Tr a n s m it t e r

Vdc power

(5)

supply

(2)

IN0

IN4

IN6

IN8

IN1

IN3IN2

IN5

IN7

Analog Com

IN9

(1)

(3)

(2)

(1)

Analog Com

IN10

IN11

IN13

IN15

(3)

Optional second Vdc power

(6)

supply

(1) There are two common terminals for all of the 16 voltage inputs. These two analog common terminals are

connected internally. (2) All shield wires should be connected to chassis mounting screws. (3) Unused channels should be connected to the analog common terminals (0 Volts). (4) If separate shielded cables are used for each analog input channel, interposing terminal blocks are needed to

terminate up to 16 common wires. Then, 1 to 4 common wires should be wired from the interposing terminal

block to the 2 common terminals on the 1746-NI16V module. (5) The module does not provide loop power for analog inputs. Use a power supply that matches the transmitter

specifications. (6) More than one power supply can be used if all supplies are class 2.

NOTE

(4)

IN12

IN14

Although the above diagram has 12 unused inputs, only 4 channels are shown connected to the Analog Com as an example.

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1746-NI16I

Channel 0 2-wire current Transmitter

Channel 2 2-wire current Tr a ns m it t e r

(2)

(3)

(2)

(4)

Vdc power supply

(5)

Optional second Vdc power

supply

(6)

(1)

Installation and Wiring 3-11

IN0

IN4

IN6

Analog Com

IN8

IN10

IN12

IN14

IN1

IN3IN2

IN5

IN7

Analog Com

IN9

IN11

IN13

IN15

(1) There are two common terminals for all of the 16 current inputs. These two analog common terminals are

to terminate up to 16 common wires. Then 1 to 4 common wires should be wired from the interposing

terminal block to the 2 common terminals on the 1746-NI16I module. (5) The module does not provide loop power for analog inputs. Use a power supply that matches the

transmitter specifications. (6) More than one power supply can be used if all supplies are class 2.

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3-12 Installation and Wiring

Wiring Guidelines

ATTENTION

To prevent shock hazard, care should be taken when wiring the module to analog signal sources. Before wiring any analog module, disconnect power from the SLC 500 system and from any other source to the analog module.

Follow the guidelines below when planning your system wiring.

To limit noise, keep signal wires as far away as possible from

•

power and load lines. To ensure proper operation and high immunity to electrical

•

noise, always use Belden™ 8761 (shielded, twisted pair) or equivalent wire.

Connect the shield drain wire to the earth ground of the chassis.

•

Tighten terminal screws using a flat or cross-head screwdriver.

•

Each screw should be turned tight enough to immobilize the wire’s end. Excessive tightening can strip the terminal screw. The torque applied to each screw should not exceed 0.7 to 0.9 Nm (6 to 8 in-lbs) for each terminal.

Follow system grounding and wiring guidelines found in your

•

SLC 500 Modular Hardware Style Installation and Operation Manual, publication 1747-6.2.

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Installation and Wiring 3-13

where: Vs = input device voltage

Rs = input device impedance Rin = 1746-NI16 input impedance (See specifications in Appendix A.)

Input Devices

Transducer Source Impedance

If the source impedance of the input device and associated cabling is too high, it affects the accuracy of the channel data word. Source impedance of 2000 ohms produces up to 0.01% of module error over and above the specified accuracy of the module.

You can compensate for device impedance error by implementing the following equation in your ladder program:

VSV

measured

(

RsR

)

Wiring Input Devices to the 1746-NI16

After the analog input module is properly installed in the chassis, follow the wiring procedure below using Belden™ 8761 cable.

Signal Wire

ATTENTION

Care should be taken to avoid connecting a voltage source to a channel configured for current input. Improper module operation or damage to the voltage source can occur.

Cable

Drain Wire (Twist the drain wire and the foil shield together

and connect to earth ground or to the chassis mounting screws.)

Foil Shield

(Cut foil shield and drain wire.)

Signal Wire

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3-14 Installation and Wiring

To wire your 1746-NI16 module follow these steps.

1. At each end of the cable, strip some casing to expose the individual wires.

2. Trim the signal wires to 50 mm (2 in.) lengths. Strip about 5 mm (3/16 in.) of insulation away to expose the end of the wire.

3. At one end of the cable, twist the drain wire and foil shield together.

4. At the other end of the cable, cut the drain wire and foil shield back to the cable.

5. Connect the signal wires to the 1746-NI16 terminal block or interposing terminal block.

6. Connect the shield drain wire to chassis ground.

7. Connect the other end of the cable to the voltage or current

transmitter terminals.

8. Repeat steps 1 through 7 for each channel on the module.

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Chapter

Preliminary Operating Considerations

This chapter explains how the analog input module and the SLC 500™ processor communicate through the module’s input and output image. It lists the preliminary setup and operation required before the module can function in a 1746 I/O system. Topics discussed include how to:

enter the module ID code

•

select the Class 1 or Class 3 interface

•

address your 1746-NI16 module

•

select the proper input filter for each channel

•

calculate the module update time

•

interpret the module response to slot disabling

•

Module ID Code

The module identification code is a unique number encoded for each 1746 I/O module. The code defines for the processor the type of I/O or specialty module residing in a specific slot in the 1746 chassis.

Catalog Number ID Code

1746-NI16I Class 1 interface 3504

Class 3 interface 10403

1746-NI16V Class 1 interface 3505

Class 3 interface 10406

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4-2 Preliminary Operating Considerations

Class 1 and Class 3 Interface

NOTE

Advanced Programming Software (APS) supports Class 3

•

Not all programming software supports configuration for Class 3 operation.

configuration. After entering the ID code (NI16I - 10403, NI16V - 10406), enter 32 input words and 32 output words.

SLC 500 A.I. Series™ Programming Software supports Class 3

•

configuration. After entering the ID code (NI16I - 10403, NI16V - 10406), enter 32 input words and 32 output words.

RSLogix 500™, version 1.30 or later, supports Class 3

•

configuration. After entering the ID code (NI16I - 10403, NI16V - 10406), select Class 3 operation.

Earlier versions of RSLogix 500 only support configuration for

•

Class 1 operation. Contact Rockwell Software for information on upgrading your software.

The 1746-NI16 analog input module has multi-class interface capabilities. Class 1 is the default configuration. The module can be configured through the user program for Class 3, which enables user-defined data scaling and monitoring of channel status words. Use Class 3 operation whenever possible.

Configuration Class 1 Class 3

Compatible SLC Processors

Compatible Chassis

Input and Output Images

Default Class 1 is the default on

SLC 500 fixed, SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04 and SLC 5/05

local chassis or remote chassis with a 1747-ASB module

output image

8 words available for configuring 16 channels

input image:

8 words available for 16 data words and 16 status words

power-up

SLC 5/02, SLC 5/03, SLC 5/04 and SLC 5/05

local chassis or remote ControlNet chassis with a 1747-ACN(R) module

output image:

24 words available for configuring all 16 channels

input image:

32 words available for 16 data words and 16 status words

Class 3 is programmable by user

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Preliminary Operating Considerations 4-3

Module Addressing

SLC 5/0X

Data Files

Slot e

Output Image

Slot e

Input Image

Output Scan

Input Scan

The following memory maps show you how the input image and output image tables are defined for Class 1 and Class 3.

Class 1 Memory Map

Anal og Input M odule

Image Table

Output Image 8

Words

Input Image 8

Words

(Class 1)

Output

Image

Input

Image

Bit 15

Channel 0 or 8 Configuration Channel 1 or 9 Configuration Channel 2 or 10 Configuration Channel 3 or 11 Configuration Channel 4 or 12 Configuration Channel 5 or 13 Configuration Channel 6 or 14 Configuration Channel 7 or 15 Configuration

Channel 0 or 8 Data or Status Words

Channel 1 or 9 Data or Status Word Channel 2 or 10 Data or Status Words Channel 3 or 11 Data or Status Words Channel 4 or 12 Data or Status Words

Channel 5 or 13 Data or Status Words Channel 6 or 14 Data or Status Words

Channel 7 or 15 Data or Status Words

Bit 15

Bit 0

Word 0 Word 1

Word 2 Word 3 Word 4 O:e.4 Word 5 Word 6 O:e.6 Word 7

Word 0

Word 1 Word 2

Word 3 Word 4

Word 5 Word 6

Word 7

Address O:e.0 O:e.1

O:e.2 O:e.3

O:e.5

O:e.7

Address I:e.0

I:e.1 I:e.2

I:e.3 I:e.4

I:e.5 I:e.6 I:e.7

NOTE

The 8 output image words can either configure channels 0 to 7 or 8 to 15 depending on how bit 0 is set.

The 8 input image words show either data or status for channels 0 to 7 or 8 to 15. Bits 0 and 1 in the configuration word determine whether status or data is shown.

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4-4 Preliminary Operating Considerations

SLC 5/0X

Data Files

Slot e

Output Scan

Output Image

Class 3 Memory Map

Analog Input

Module Image

Ta bl e

Output Image

32 Words

Output Image

Channel 0 Configuration Word Channel 1 Configuration Word Channel 2 Configuration Word Channel 3 Configuration Word Channel 4 Configuration Word

Channel 5 Configuration Word Channel 6 Configuration Word Channel 7 Configuration Word Channel 8 Configuration Word

Channel 9 Configuration Word Channel 10 Configuration Word Channel 11 Configuration Word Channel 12 Configuration Word Channel 13 Configuration Word Channel 14 Configuration Word

Channel 15 Configuration Word

Word 16 is Lower Limit Range 0 Word 17 is Upper Limit Range 0

Word 18 is Lower Limit Range 1 Word 19 is Upper Limit Range 1

Word 20 is Lower Limit Range 2 Word 21 is Upper Limit Range 2 Word 22 is Lower Limit Range 3 Word 23 is Upper Limit Range 3

Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7 Word 8

Word 9 Word 10 Word 11 Word 12 Word 13 Word 14

Word 15 Word 16 Word 17 Word 18 Word 19

Word 20 Word 21 Word 22 Word 23

Address

O:e.0 O:e.1 O:e.2 O:e.3 O:e.4 O:e.5 O:e.6 O:e.7 O:e.8

O:e.9 O:e.10 O:e.11 O:e.12 O:e.13 O:e.14

O:e.15 O:e.16 O:e.17 O:e.18 O:e.19

O:e.20 O:e.21 O:e.22 O:e.23

Slot e

Input Image

Input Scan

Input Image

32 Words

Input Image

Channel 0 Data Word Channel 1 Data Word Channel 2 Data Word Channel 3 Data Word Channel 4 Data Word Channel 5 Data Word Channel 6 Data Word Channel 7 Data Word

Channel 8 Data Word

Channel 9 Data Word Channel 10 Data Word Channel 11 Data Word Channel 12 Data Word Channel 13 Data Word

Channel 14 Data Word Channel 15 Data Word

Channel 0 Status Word Channel 1 Status Word

Channel 2 Status Word Channel 3 Status Word Channel 4 Status Word Channel 5 Status Word Channel 6 Status Word Channel 7 Status Word

Channel 8 Status Word Channel 9 Status Word

Channel 10 Status Word Channel 11 Status Word

Channel 12 Status Word Channel 13 Status Word Channel 14 Status Word

Channel 15 Status Word

Word 0 Word 1 Word 2 Word 3 Word 4 Word 5 Word 6 Word 7

Word 8

Word 9 Word 10 Word 11 Word 12 Word 13

Word 14 Word 15

Word 16 Word 17

Word 18 Word 19 Word 20 Word 21 Word 22 Word 23

Word 24 Word 25 Word 26 Word 27

Word 28 Word 29 Word 30

Word 31

I:e.0 I:e.1 I:e.2 I:e.3 I:e.4 I:e.5 I:e.6 I:e.7

I:e.8

I:e.9 I:e.10 I:e.11 I:e.12 I:e.13

I:e.14 I:e.15

I:e.16 I:e.17

I:e.18 I:e.19 I:e.20 I:e.21 I:e.22 I:e.23

I:e.24 I:e.25 I:e.26 I:e.27

I:e.28 I:e.29 I:e.30

I:e.31

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Preliminary Operating Considerations 4-5

Word

File Type

Word Delimiter

Element Delimiter

Slot

Output Image - Configuration Words

The module output image (defined as the output from the processor to the module) contains information that you configure to define the way a specific module channel works. Each output word configures a single channel.

Example - If you want to configure channel 2 on the analog module located in slot 4 in the chassis, your address would be O:4.2.

O : 4 . 2

Chapter 5, Channel Configuration, Data, and Status, gives you detailed bit information about the data content of the configuration word. Also, see Chapter 7 for a detailed explanation and application examples.

Input Image - Data Words and Status Words

The input image (defined as the input word from the module to the processor) represents data words and status words.

Input words hold the input data that represent the value of analog inputs for channels 0-15. This data word is valid only when the channel is enabled and there are no channel errors.

Class 1 Input Words - Data

The data words for Class 1 are input words 0 through 7. Setting bits 1 and 0 in the output configuration word to 00 or 01 returns the data for channels 0 through 7 or 8 through 15, respectively. Class 1 data mode only returns a 14-bit integer ±3 LSB of the Class 3 resolution. The remaining 2 bits, bits 1 and 0, indicate whether the input word is data or status for channels 0 through 7 or 8 through 15.

Class 3 Input Words - Data

The data words for Class 3 are the input words 0 through 15. Data for all 16 channels can be viewed simultaneously, and all data words are 16-bit integer values.

Input words also contain the status of channels 0 through 15. The status bits for a particular channel reflect the configuration settings that you entered into the output image configuration word for that

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4-6 Preliminary Operating Considerations

Word

Slot

Word Delimiter

File Type

Element Delimiter

channel and provide information about the channel’s operational state. To receive valid status information, the channel must be enabled, and the channel must have processed any configuration changes that may have been made to the configuration word.

Class 1 Input Words - Status

The status words for Class 1 are the input words 0 through 8. Setting bits 1 and 0 in the output configuration word to 10 or 11 returns status for channels 0 through 7 or 8 through 15, respectively.

Class 3 Input Words - Status

The status words for Class 1 are the input words 16 through 31. Status for all 16 channels can be viewed at the same time as data for all 16 channels.

Class 3 Example - To obtain the status of channel 2 (input word 18) of the analog module located in slot 4 in the SLC chassis, use address I:4.18.

Module Update Time

I : 4 . 18

Chapter 5, Channel Configuration, Data, and Status, gives you detailed bit information about the content of the data word and the status word. Also, see Chapter 7 for a detailed explanation and application examples.

The module update time is defined as the time required for the module to sample and convert the input signals of all enabled input channels and provide the resulting data values to the SLC 500 processor. For the most part, the module update time depends on the filter setting. Lower filter frequencies can be selected to reject noise. However, as noise rejection improves, module update time increases. Choose the lowest filter frequency consistent with how quickly your program requires fresh analog data.

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Preliminary Operating Considerations 4-7

The 1746-NI16 module sequentially samples the channels in a continuous loop according to the following diagram. The next channel in the order is sampled if any channel is disabled.

Channel 0

Channel 4

Channel 8

Channel 12 Channel 1

Channel 5

Channel 9 Channel 13

Channel 2

Channel 6

Channel 10 Channel 14

Channel Sample Order

Channel 3

Channel 7

Channel 11

Channel 15

The following table shows the module update time. The module update time is different depending on the number of channels enabled and filter frequency. The fastest module update time occurs when only one channel is enabled on each A/D chip (channels 0, 4, 8, and 12). The slowest module update time occurs when 16 channels are enabled.

Filter Frequency (Hz)

6 630 473 314 7 10 380 285 190 4 20 194 145 96 4 40 10075504 60 69 52 34 4

Update Time 16-Ch (ms)

(1)

Update Time 12-Ch (ms)

(1)

Update Time 8-Ch (ms)

(1)

Update Time 4-Ch (ms)

(1)

80 54 39 26 4 100 3727184 250 18139 4

(1)

Assuming all of the enabled channels have the filter frequency shown in the first column.

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4-8 Preliminary Operating Considerations

The hardware architecture has some bearing on how the module firmware works and thus how a user can optimize performance when fewer than all 16 channels are required. You can enable any number of channels you want, but certain channel selections make data available to your ladder program more quickly than others.

The module uses four A/D converters, each multiplexing four input channels. The first A/D is for channels 0 through 3, the second for 4 through 7, and so forth. Although there is room in the configuration data table to select a different filter for each channel, the filter value programmed for the first channel of each A/D is used for all four channels of that A/D. In other words, the filter selection made for channel 0 is used for channels 0 through 3. The selection programmed for channel 4 is applied to channels 4 through 7, and so forth.

If your application requires 12 or fewer of the 16 analog inputs, you can achieve a module update time of about 3/4 of the time listed in the table above for 16 channels if you enable channels in a certain way. Use the first three channels on each A/D, leaving the fourth channel disabled. For example, if you enable channels 0, 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, and 14, your module update time is about 75 ms with the 40 Hz filter instead of 100 ms listed in the table if all 16 inputs are enabled.

Similarly, if you need 8 or fewer channels, you can achieve a module update time of about one-half the 16-channel table values. For example, if you enable only channels 0, 1, 4, 5, 8, 9, 12, 13, the module update time is about 50 ms with a 40 Hz filter.

Finally, for very fast response you may use four or fewer channels. This mode exploits the power of dedicating one A/D converter per channel. The A/Ds are considerably faster when they do not have to multiplex inputs.

NOTE

In this mode, the module provides four channels of data every 4 ms, regardless of filter setting.

The same channels are used on each of the four A/D converters. In the 12-or-fewer-channels example above, note that you are using channels 0, 1, and 2 on each of the four A/D converters, but channel 3 on each remains disabled. If you just enable the first 12 channels (0 to 11) on the module, and leave channels 12 to 15 disabl ed, your update time is the same as if you had enabled all 16 channels.

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Preliminary Operating Considerations 4-9

Channel Filter Frequency Selection

The module uses a digital low-pass filter that provides noise rejection for the input signals. The digital filter is programmable, allowing you to select from eight filter frequencies for each group of four channels.

Selecting a low value (i.e., 6 Hz) for the channel filter frequency provides the best noise rejection for that group of channels. Selecting a high value for the channel filter frequency provides less noise rejection, but faster data response time. See page 4-10 for more information on noise rejection.

The table on page 4-7 shows the available filter frequencies and module data update times for each filter frequency

Channel Frequency

Channel Cut-Off Frequency

The channel filter frequency selection determines a channel’s cut-off frequency, also called the -3 dB frequency. The cut-off frequency is defined as the point on the input channel frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. All frequency components at or below the cut-off frequency are passed by the digital filter with less than 3 dB of attenuation. All frequency components above the cut-off frequency are increasingly attenuated.

The cut-off frequency for each input channel is defined by its filter frequency selection. Choose a filter frequency so that your fastest changing signal is below that of the filter’s cut-off frequency. The cut-off frequency should not be confused with update time. The cut-off frequency relates how the digital filter attenuates frequency components of the input signal. The update time defines the rate at which an input channel is scanned and its channel data word is updated.

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4-10 Preliminary Operating Considerations

Aliasing Frequency

Aliasing is a natural characteristic of discrete time sampling of analog signals. This can result in erroneous data in the data channel word. Aliasing is usually not a problem because the duration of the high-frequency signal is much shorter than the program scan time.

Aliasing begins at a lower frequency when more channels are enabled. Anti-aliasing filters are available, but you should check your transducer for malfunctions first, as the filters are fairly expensive.

Aliasing occurs when unwanted signals, at a frequency greater than the effective sampling rate, are present. The effective sampling rate is determined by the number of enabled channels (n). The first aliasing frequency occurs at: f

= (1 / Update Time in seconds). Subsequent

aliasing frequencies occur at integer multiples of fa.

Noise Rejection

Rejection of common mode noise is inherent in the hardware design of the module. Common mode rejection is better than -100 dB for common mode 50 Hz and 60 Hz AC signals. The module performs well in the presence of common mode noise as long as the signals applied to the user terminals do not exceed the common mode voltage rating (±10.25 Volts) of the module. Improper earth/chassis ground connections may be a source of common mode noise.

Rejection of normal mode noise is implemented in the firmware and is a function of the filter frequency selected by the user. A lower frequency filter rejects more normal mode noise than a higher frequency filter. Transducer power supply noise, transducer circuit noise, or process variable irregularities may be sources of normal mode noise.

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Preliminary Operating Considerations 4-11

Response to Slot Disabling

By writing to the status file in your modular SLC processor you can disable any chassis slot. Refer to your programming device’s manual for the slot disable/enable procedure.

ATTENTION

Always consider the implications of disabling a module before using the slot disable feature.

Input Response

When a slot is disabled, the 1746-NI16 module continues to update its input image table. However, the SLC processor does not read inputs from a module that is disabled. Therefore, when the processor disables the module slot, the module inputs appearing in the processor image table remain in their last state and the module’s updated image table is not read. When the processor re-enables the module slot, the current state of the module inputs are read by the processor during the subsequent scan.

Output Response

The SLC 500 processor may change the module output data (configuration) as it appears in the processor output image. However, this data is not transferred to the module. The outputs are held in their last state. When the slot is re-enabled, the current data in the processor image is transferred to the module.

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4-12 Preliminary Operating Considerations

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Chapter

Channel Configuration, Data, and Status

This chapter examines the channel configuration word and the channel status word bit by bit and explains how the module uses configuration data and generates status during operation. It gives you information about how to:

configure a channel

•

scale the channel data

•

check a channel’s status

•

Channel Configuration

The channel configuration word is a part of the 1746-NI16 module’s output image as shown below. The module output image uses 8 words when the module is in Class 1 mode and 32 words when the module is in Class 3 mode. A description of the output image is shown below.

1746-NI16 Module Output Image - Channel Configuration

Class 1 Class 3

O:e.0 channel 0 configuration word bit-mapped field • • O:e.1 channel 1 configuration word bit-mapped field • • O:e.2 channel 2 configuration word bit-mapped field • • O:e.3 channel 3 configuration word bit-mapped field • • O:e.4 channel 4 configuration word bit-mapped field • • O:e.5 channel 5 configuration word bit-mapped field • • O:e.6 channel 6 configuration word bit-mapped field • • O:e.7 channel 7 configuration word bit-mapped field • • O:e.8 channel 8 configuration word bit-mapped field • O:e.9 channel 9 configuration word bit-mapped field • O:e.10 channel 10 configuration word bit-mapped field • O:e.11 channel 11 configuration word bit-mapped field • O:e.12 channel 12 configuration word bit-mapped field • O:e.13 channel 13 configuration word bit-mapped field • O:e.14 channel 14 configuration word bit-mapped field • O:e.15 channel 15 configuration word bit-mapped field • O:e.16 lower limit range 0 16-bit integer • O:e.17 upper limit range 0 16-bit integer • O:e.18 lower limit range 1 16-bit integer • O:e.19 upper limit range 1 16-bit integer • O:e.20 lower limit range 2 16-bit integer • O:e.21 upper limit range 2 16-bit integer • O:e.22 lower limit range 3 16-bit integer • O:e.23 upper limit range 3 16-bit integer •

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5-2 Channel Configuration, Data, and Status

After installation, each channel must be configured to establish the way the channel operates. You configure the channel by entering bit values into the configuration word using your programming device. A bit-by-bit examination of the configuration word is provided in the chart on page 5-3. Programming is discussed in Chapter 7. Addressing is explained in Chapter 4.

The configuration word default setting is all zeros.

Output Image Channel Configuration Procedure

The channel configuration word consists of bit fields, the settings of which determine how the channel operates. See the chart on the following page and the descriptions that follow for configuration information. Appendix B contains a configuration worksheet.

After determining the configuration for each channel, follow the steps outlined in Chapter 2, Quick Start, or in Chapter 7, Application Examples, to enter this configuration data into your ladder program and copy it to the 1746-NI16 module.

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Channel Configuration, Data, and Status 5-3

Channel Configuration Word

Define To Select 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Class 1 Data or Status Configuration

Class 1 Handshaking

Reserved

Input Type

Data Format

Calibration

Channel needs to be disabled to perform calibration

Filter Frequency

Filter frequencies are set in ch 0, 4, 8 and 12 for that channel and the following 3 channels in that group. Filter groupings are: (0 to 3) (4 to 7) (8 to 11) and (12 to 15)

Channel Enable

Read Data for Channel 0 to 7 Read Data for Channel 8 to 15 Read Status for Channel 0 to 7 Read Status for Channel 8 to 15 To Reset Status Bit 6 Transmit Channel Configuration 1 Not Used +/- 10 Vdc or +/- 20 ma 1 to 5 Vdc or 4 to 20 ma 01 0 to 5 Vdc or 0 to 1 ma 10 0 to 10 Vdc or 0 to 20 ma 11 Engineering Units Scaled-for-PID 001 Proportional Counts 010 1746-NI4 Data Format 011 User Limit Range 0 (Class 3 Only) 100 User Limit Range 1 (Class 3 Only) 101 User Limit Range 2 (Class 3 Only) 110 User Limit Range 3 (Class 3 Only) 111 Normal RUN Mode (Exit Calibration

Mode) Enter Calibration Mode 001 Perform Zero Calibration 011 Perform Full Scale Calibration 101 6 Hz 10 Hz 00 1 20 Hz 01 0 40 Hz 01 1 60 Hz 10 0 80 Hz 10 1 100 Hz 11 0 250 Hz 11 1 Channel Disabled 0 Channel Enabled 1

00 0

000

00 01 10 11

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5-4 Channel Configuration, Data, and Status

Select Channel Enable (Bit 15)

Determine which channels are used in your program and enable them. Place a 1 in bit 15 to enable a channel. Place a 0 in bit 15 to disable the channel. In class 1, only the handshake bit (bit 2) needs to be set to transmit this configuration bit change.

The 1746-NI16 only samples data from channels that are enabled. To optimize module operation and minimize throughput times, disable unused channels by setting the channel enable bit to 0.

When the channel enable bit is set (1), the module reads the configuration word information you have selected. While the enable bit is set, modification of the configuration word may lengthen the module update time for one cycle. If any change is made to the configuration word, the change must be reflected in the status word before new data is valid.

While the channel enable bit is cleared (0), the channel data word and status word values are cleared. After the channel enable bit is set (1), the channel data word and status word remain cleared until the module sets the channel status bits (bits 15, 14, and 13 to 1, 1, and 1) in the channel status word, signifying that the channel is operating without an error. See “Channel Status Checking” on page 5-16.

Select Channel Filter Frequency (Bits 14 through 12)

The 1746-NI16 module features eight different filter frequencies. Choose the desired filter by entering the 3-digit binary code in bits 12 through 14 of the channel configuration word. You can select a different filter setting for each A/D chip. Each chip samples a group of 4 input channels. The groups of A/D inputs are shown in the table on page 5-5.

The filter selection for all of the channels in a group is selected using the configuration word of the first channel in each group. These channels are channels 0, 4, 8, and 12. Even if the first channel in each group is disabled, the desired filter frequency must be selected in that channel’s configuration word; otherwise, the default filter frequency of 6Hz is used. Setting the filter frequency in the other channels (1 to 3, 5 to 7, 9 to 11, or 13 to 15) will not select a filter. Instead, the default filter is selected.

The default filter setting is 6 Hz. The default filter setting is the bit pattern (0, 0, 0) in bits 14 through 12.

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Channel Configuration, Data, and Status 5-5

A/D Groups

Group 1

Group 2

Group 3

Group 4

Channels in A/D Group

Channel 0 Channel 1 Channel 2 Channel 3

Channel 4 Channel 5 Channel 6 Channel 7

Channel 8 Channel 9 Channel 10 Channel 11

Channel 12 Channel 13 Channel 14 Channel 15

How to select Filter Frequencies for the different A/D Groups

Filter selection for all the channels in group 1 is done in the configuration word for channel 0. Even if channel 0 is disabled, the filter setting needs to be selected in channel 0 for the rest of the channels in group 1. Setting the filter in channels 1-3 will not select a filter, rather the default filter is selected.

Filter selection for all the channels in group 2 is done in the configuration word for channel 4. Even if channel 4 is disabled, the filter setting needs to be selected in channel 4 for the rest of the channels in group 2. Setting the filter in channels 5-7 will not select a filter, rather the default filter is selected.

Filter selection for all the channels in Group 3 is done in the configuration word for channel 8. Even if channel 8 is disabled, the filter setting needs to be selected in channel 8 for the rest of the channels in group 3. Setting the filter in channels 9-11 will not select a filter, rather the default filter is selected.

Filter selection for all the channels in Group 4 is done in the configuration word for channel 12. Even if channel 12 is disabled, the filter setting needs to be selected in channel 12 for the rest of the channels in group 4. Setting the filter in channels 13-15 will not select a filter, rather the default filter is selected.

The filter frequency affects the noise rejection characteristics. A lower filter frequency increases noise rejection, and a higher filter frequency decreases noise rejection. Select a filter frequency considering acceptable noise and step response time. See “Channel Filter Frequency Selection” on page 4-9 for more information on filter frequency.

Select Calibration Mode (Bits 11 through 9)

To enter the calibration routine, set bit 9 to 1. You must perform the low calibration first and then the high calibration to successfully calibrate the module.

Low Calibration

Short channel input to analog common terminal. Then, set bit 10 of the channel to be calibrated to 1. Clear bit 10 when completed.

High Calibration

Apply +10.25V dc ± 200 µV or +21 mA ± 200 nA between channel input and analog common. Then, set bit 11 of the channel to be calibrated to 1. Clear bits 11 and 9 when completed.

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5-6 Channel Configuration, Data, and Status

Select Data Format (Bits 8 through 6)

Select a data format for the data word value. Your selection determines how the analog input value from the A/D converter is expressed in the data word. Enter your 3-digit binary code in bit fields 8 through 6 of the channel configuration word. The data types are:

Engineering Units

•

Scaled-for-PID

•

Proportional Counts

•

1746-NI4 Data Format

•

User-defined Scaling (Class 3 Only)

•

For all data types, the channel data word is proportional to the analog input signal.

To have the data in “real” units, the channel data word must be scaled mathematically. See “Input Image - Channel Data Word” on page 5-8 for the default scaling values and “Scaling the Channel Data Word” on page 5-10 for data type descriptions and scaling examples.

Select Input Type (Bits 5 and 4)

The input type bit field lets you configure the channel for the type of input device you have connected to the module. Valid input is an analog voltage or current that provides a signal within one of the specified ranges.

Determine the input device type for a channel and enter its respective 2-digit binary code in bit fields 5 and 4 of the channel configuration word.

Unused Bit (Bit 3)

Bit 3 is not used on the 1746-NI16I or 1746-NI16V modules. Ensure this bit is always set to zero, or the module returns a configuration error in the status word for that channel.

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Channel Configuration, Data, and Status 5-7

Class 1 Handshaking (Bit 2)

In Class 1, the module provides handshaking to simplify configuration. This handshaking feature is the fastest way to configure the module’s 16 channels. To transmit a channel’s configuration, bit 2 should be set to 1. When the module has completed this instruction, a 1 is placed in bit 6 of the status word. To reset bit 6 of the status word to 0, reset bit 2 in the configuration word to 0. After channels 0 through 7 are configured, then channels 8 through 15 can be configured. An application example for Class 1, using bits 2 and 6 to perform configuration handshaking for all 16 channels, can be found on page 7-1. The handshaking between bits 2 and 6 is not needed in Class 3 since all 32 words of data and status can be sent and received at once.

Class 1 Data or Status Configuration (Bits 1 and 0)

Bits 1 and 0 are only used in Class 1 mode. If these bits are set while in Class 3 mode, a configuration error is set in the status word (bits 15, 14 and 13 set to 0, 1, and 1). The use of these bits is not necessary in Class 3 because Class 3 allows for data transfer of a 32-word block. In Class 1 mode, data transfer is limited to 8-word blocks. The 1746-NI16 has the ability to communicate 16 words of data and 16 words of status information. Therefore, the user can choose which block of 8 words is needed via bits 1 and 0 in the configuration word. This is done in the following manner:

Set Bit 0 to: to select channels: Set Bit 1 to: to select:

0 0 through 7 0 data 1 8 through 15 1 status information

NOTE

For a description of data reporting in the status word, see “Input Word Bit Definitions” on page 5-20.

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Input Image - Channel Data Word

The module input image uses 8 data word values in Class 1 and 16 data word values in Class 3. The converted voltage or current input data values reside in I:e.0 through I:e.7 (Class 1) or I:e.0 through I:e.15 (Class 3) of the module’s input image file. When an input channel is disabled, its data word is reset to zero.

Class 1 Data Word

Bit 1 set to

I:e.0 channel 0 data word 14-bit integer 0 0 I:e.1 channel 1 data word 14-bit integer 0 0 I:e.2 channel 2 data word 14-bit integer 0 0 I:e.3 channel 3 data word 14-bit integer 0 0 I:e.4 channel 4 data word 14-bit integer 0 0 I:e.5 channel 5 data word 14-bit integer 0 0 I:e.6 channel 6 data word 14-bit integer 0 0 I:e.7 channel 7 data word 14-bit integer 0 0 I:e.0 channel 8 data word 14-bit integer 0 1 I:e.1 channel 9 data word 14-bit integer 0 1 I:e.2 channel 10 data word 14-bit integer 0 1 I:e.3 channel 11 data word 14-bit integer 0 1 I:e.4 channel 12 data word 14-bit integer 0 1 I:e.5 channel 13 data word 14-bit integer 0 1 I:e.6 channel 14 data word 14-bit integer 0 1 I:e.7 channel 15 data word 14-bit integer 0 1

(1) In Class 1, bit 1 determines whether data or status resides in the input image. Bit 0 determines whether

channels 0 through 7 or 8 through 15 are shown.

(1)

Bit 0 set to

(1)

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Channel Configuration, Data, and Status 5-9

Class 3 Data Word

I:e.0 channel 0 data word 16-bit integer I:e.1 channel 1 data word 16-bit integer I:e.2 channel 2 data word 16-bit integer I:e.3 channel 3 data word 16-bit integer I:e.4 channel 4 data word 16-bit integer I:e.5 channel 5 data word 16-bit integer I:e.6 channel 6 data word 16-bit integer I:e.7 channel 7 data word 16-bit integer I:e.8 channel 8 data word 16-bit integer I:e.9 channel 9 data word 16-bit integer I:e.10 channel 10 data word 16-bit integer I:e.11 channel 11 data word 16-bit integer I:e.12 channel 12 data word 16-bit integer I:e.13 channel 13 data word 16-bit integer I:e.14 channel 14 data word 16-bit integer I:e.15 channel 15 data word 16-bit integer

The channel data word contains a 16-bit integer that represents the value of the analog input channel. The tables below show the channel data word values for various input types and data formats. The second table shows the default full-scale values for the proportional counts data format. The table does not imply the entire data value range is usable resolution.

Channel Data Word Values for Engineering Units

Input Type Signal Range Engineering Units Engineering Units

Scale

±10V dc -10.25V to +10.25V -10250 to +10250 1 mV/step

0 to 5V dc -0.25V to +5.25V -250 to +5250 1 mV/step

1 to 5V dc +0.75V to +5.25V +750 to +5250 1 mV/step

0 to 10V dc -0.5V to +10.25V -500 to +10250 1 mV/step

0 to 20 mA -1.0 mA to 21 mA -1000 to +21000 1.0 µA/step

4 to 20 mA 3.0 mA to 21mA 3000 to 21000 1.0 µA/step

±20 mA -21 mA to 21 mA -21000 to +21000 1.0 µA/step

0 to 1 mA -0.05 mA to 1.05 mA -50 to +1050 1.0 µA/step

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Channel Data Word Values for Scaled Data

Input Type Signal Range Scaled-for-PID Proportional Counts (default) NI4 Data Format

±10V dc -10.00V to +10.00V 0 to 16383 -32768 to 32767 -32768 to 32767 0 to 5V dc 0.0V to +5.00V 0 to 16383 -32768 to 32767 0 to 16384 1 to 5V dc +1.00V to +5.00V 0 to 16383 -32768 to 32767 3277 to 16384 0 to 10V dc 0.0V to +10.00 V 0 to 16383 -32768 to 32767 0 to 32767 0 to 20 mA 0.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 0 to 16384 4 to 20 mA 4.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 3277 to 16384 ±20 mA -20.0 mA to 20.0 mA 0 to 16383 -32768 to 32767 -16384 to 16384 0 to 1 mA 0.0 mA to 1.00 mA 0 to 16383 -32768 to 32767

(1) This data format is not supported by the 1746-NI4 module, but is available for the 1746-NI8 and 1746-NI16 modules.

0 to 1000

(1)

Scaling the Channel Data Word

This section provides descriptions of how the data types are expressed in the channel data word and examples of how to mathematically convert the data.

Data Type Descriptions

The engineering units are 1 mV/step for voltage input types and

1.0 µA/step for current input types.

The scaled-for-PID value is a 14-bit unsigned integer, with 0 representing the low-scale value and 16,383 representing the full-scale value minus 1 LSB. The input signal range is proportional to your selected input type and scaled into a 0-16,383 range, which is standard to the SLC PID algorithm.

The proportional count value is a 16-bit signed integer. The input signal range is proportional to your selected input and scaled into a

-32,768 to 32,767 range.

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Channel Configuration, Data, and Status 5-11

The 1746-NI4 data format converts the current and voltage signals into 16-bit two’s complement binary values. The table below identifies the current and voltage input ranges for the input channels, the number of significant bits, and the resolution.

Voltage/Current Range Decimal Representation Number of Significant Bits Resolution per LSB

-10V dc to +10V dc - 1LSB -32768 to +32,767 16 bits 305.176 µV 0 to 5V dc 0 to 16,384 14 bits 1 to 5V dc 3,277 to 16,383 13.67 bits 0 to 10V dc - 1LSB 0 to 32,767 15 bits 0 to 20 mA 0 to 16,384 14 bits 1.22070 µA 4 to 20 mA 3,277 to 16,384 13.67 bits

-20 mA to +20 mA -16,384 to +16,384 15 bits 0 to 1 mA 0 to 1000 10 bits

(1) This data format is not supported by the 1746-NI4 module, but is available for the 1746-NI8 and 21746-NI16 modules.

1 µA

(1)

User-defined scaling count (Class 3 operation only) allows the output image data words 16 and 17, 18 and 19, 20 and 21, or 22 and 23 to be selected to represent low-scale and high-scale limits. The module uses these limits and scales proportionately between them. For example, if words 16 and 17 are selected to represent low and high scaling ranges, and word 16 contains 0 (decimal), and word 17 contains 20000 (decimal), this would represent the range of values to which the voltage or current readings would be scaled. The lowest voltage or current reading would be scaled to 0, and the highest voltage or current reading would be scaled to 20000, with other readings scaled proportionately between them.

If the module is in Class 1 mode, and you attempt to configure for user-defined proportional counting, a configuration error is generated.

Using Scaled-for-PID and Proportional Counts

The scaled-for-PID and proportional count selections provide the highest display resolution, but also require you to manually convert the channel data to “real” units.

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5-12 Channel Configuration, Data, and Status

Scaling Examples

The following scaling examples show how to convert the channel data word from the configured data type to “real” units. Real units are the values being measured, such as temperature and pressure. To perform the scaling, you must know the defined voltage or current range for the channel’s input type. The lowest possible actual value for an input type is ScaledMin, and the highest possible actual value is ScaledMax. Refer to the Channel Data Word Value tables on page 5-9 and page 5-10 for the channel word signal ranges.

NOTE

In all of the examples on pages 5-13 to 5-15, the zero offset is the low range limit (InputMin).

Formulas

Three formulas are used in all of the following examples. They are:

Scaled Value Input Value Slope

×()

where:

Slope

ScaledMax·ScaledMin

()

--------------- --------------- -------------- --------------- -------------- ------------=

InputMax InputMin

()

– –

and

Offset ScaledMin InputMin Slope

–

Offset+

×()

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Channel Configuration, Data, and Status 5-13

Engineering Units to Real Units

Example #1: A transducer is being used to measure temperature.

The 4 to 20 mA signal is proportional to 100 to 500°C (212 to 932°F). The input data is in engineering units, i.e. 4 to 20 mA where

4mA

----------------------------------- 4 0 0 0= 1µA per step

and

20mA

----------------------------------- 2 0 00 0= 1µA per step

Input value to convert = 5500

The scaled range is 212 to 932°F The input range is 4000 to 20000

Find: Input Value in °F.

Per the equations above:

932 212

–

()

Slope

Offset 212 4000 0.045

Scaled Value 5500 0.045

-----------------------------------------·0.045 20000 4000

–

()

×()

=–=

279.5°F

Example #2: A transducer is being used to measure temperature.

The 0 to 10V dc signal range is proportional to 0 to 10°C. The input data is in engineering units, i.e. 0 to 10V dc where

10Vdc

----------------------------------- 1 00 0 0= 1mV per step

Input value to convert = 5000.

Find: Input value in °C.

Per the equations above:

10 0

–

()

Slope

--------------------------------0.001== 10000 0

–

()

Offset 0 0 0.001

Scaled Value 5000 0.001

–=

×()

5°C

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5-14 Channel Configuration, Data, and Status

Scaled-for-PID to Real Units

Example: #3 A transducer is being used to measure temperature.

The 4 to 20 mA signal range is proportional to 100 to 500°C (212 to 932°F) The input data is scaled for PID, i.e. input range of 0 to 16383 Input value to convert = 5500

The scaled range is 212 to 932°F The Input range is 0 to 16383

Find: Input value in °F

Per the equation above:

932 212

–

()

Slope

--------------------------------0.044== 16383 0

–

()

Offset 212 0 0.044

Scaled Value 5500 0.044

–=

×()

212=

212

454°F

Proportional Counts to Real Units

Example: #4 A transducer is being used to measure pressure.

The -10V dc to +10V dc signal range is proportional to 0 to 200 psi The input data is in “Proportional Counts” data format, i.e. -32768 to 32767 Input value to convert = 21567

The Scaled range is 0 to 200 psi The Input range is -32768 to 32767

Find: Input value in psi

Per the equation above:

200 0

–

()

Slope

------------------------------------------------------ 0 . 0 0 3== 32767 32768

[]

–

()

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Offset 0 32768 0.003

–

()

Scaled Value 21567 003

()

×()

98.3=

98.3

163 psi

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Channel Configuration, Data, and Status 5-15

1746-NI4 Data Format Units to Real Units

Example: #5 A transducer is being used to measure flow rate.

The -10V dc to +10V dc signal range is proportional to 0 to 100 GPM The input data is in “1746-NI4” format, i.e. input range of -32768 to 32767 Input value to convert = 10000

The Scaled range is 0 to 100 GPM The Input range is -32768 to +32767

Find: Input value in GPM

Per the equations above:

100 0

–

()

Slope

------------------------------------------------------ 0 . 0 0 1 5== 32767 32768

[]

–

()

Offset 0 32768–0.0015

Scaled Value 10000 0.0015

–=

×()

49.15=

49.15

=+=

64.15 GPM

User-Defined Scaling Data Format to Real Units

Example: #6 A transducer is being used to measure pressure.

The -10V dc to +10V dc signal range is proportional to 0 to 200 psi The input data is in “User Defined Format”, where:

The lower input limit (configuration word 8) = 0 The upper input limit (configuration word 9) = 20000

Input value to convert = 16600

Scaled range is 0 to 200 psi Input range is 0 to 20000

Find: Input value in psi

Per the equation above:

200 0

–

()

Slope

Offset 0 0 0.01

Scaled Value 16600 0.01

--------------------------------0.01== 20000 0

–

()

=–=

×()

166 psi

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5-16 Channel Configuration, Data, and Status

Channel Status Checking

If the module is in Class 3 mode, there are 8 additional input image words available for status information. The channel status word is a part of the module’s input image. Input words 16 to 31 correspond to and contain the configuration status of channels 0 to 15. You can use the data provided in the status word to determine if the input configuration data for any channel is valid per your configuration in O:e.0 through O:e.15.

For example, whenever a channel is disabled (O:e.x/15 = 0), its corresponding status word shows all zeros. This condition tells you that input data contained in the data word for that channel is not valid and should be ignored.

Class 1 Status Word

Bit 1 set to

I:e.0 channel 0 status word bit-mapped field 1 0 I:e.1 channel 1 status word bit-mapped field 1 0 I:e.2 channel 2 status word bit-mapped field 1 0 I:e.3 channel 3 status word bit-mapped field 1 0 I:e.4 channel 4 status word bit-mapped field 1 0 I:e.5 channel 5 status word bit-mapped field 1 0 I:e.6 channel 6 status word bit-mapped field 1 0 I:e.7 channel 7 status word bit-mapped field 1 0 I:e.0 channel 8 status word bit-mapped field 1 1 I:e.1 channel 9 status word bit-mapped field 1 1 I:e.2 channel 10 status word bit-mapped field 1 1 I:e.3 channel 11 status word bit-mapped field 1 1 I:e.4 channel 12 status word bit-mapped field 1 1 I:e.5 channel 13 status word bit-mapped field 1 1 I:e.6 channel 14 status word bit-mapped field 1 1 I:e.7 channel 15 status word bit-mapped field 1 1

(1) In Class 1, bit 1 determines whether data or status resides in the input image. Bit 0 determines whether

channels 0 through 7 or 8 through 15 are shown.

(1)

Bit 0 set to

(1)

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Channel Configuration, Data, and Status 5-17

Class 3 Status Word

I:e.16 channel 0 status word bit-mapped field I:e.17 channel 1 status word bit-mapped field I:e.18 channel 2 status word bit-mapped field I:e.19 channel 3 status word bit-mapped field I:e.20 channel 4 status word bit-mapped field I:e.21 channel 5 status word bit-mapped field I:e.22 channel 6 status word bit-mapped field I:e.23 channel 7 status word bit-mapped field I:e.24 channel 8 status word bit-mapped field I:e.25 channel 9 status word bit-mapped field I:e.26 channel 10 status word bit-mapped field I:e.27 channel 11 status word bit-mapped field I:e.28 channel 12 status word bit-mapped field I:e.29 channel 13 status word bit-mapped field I:e.30 channel 14 status word bit-mapped field I:e.31 channel 15 status word bit-mapped field

The channel status word can be analyzed bit by bit. In addition to providing information about an enabled or disabled channel, each bit’s status (0 or 1) tells you how the input data from the voltage or current analog sensor connected to a specific channel is translated for your application. The bit status also informs you of any error condition and can tell you what type of error occurred.

A bit-by-bit examination of the status word for Class 1 and Class 3 is provided in the respective charts on the following pages.

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5-18 Channel Configuration, Data, and Status

Class 1 Status Word

Define To Sel ect

Class 1 Data or Status Configuration

Input Type

Data Format

Class 1 Handshaking

Calibrate

Channel Status

Filter Frequency

Filter frequencies are set in ch 0, 4, 8 and 12 for that channel and the following 3 channels in that group. Filter groupings are: (0 to 3) (4 to 7) (8 to 11) and (12 to 15)

Error Conditions

Data from Channel 0 to 7 Data from Channel 8 to 15 Status for Channel 0 to 7 Status for Channel 8 to 15 ±10 Vdc or ± 20 mA 1 to 5 Vdc or 4 to 20 mA 0 to 5 Vdc or 0 to 1 mA 0 to 10 Vdc or 0 to 20 mA Engineering Units Scaled-for-PID Proportional Counts 1746-NI4 Data Format Ready to receive channel configuration Processed channel configuration Normal RUN Mode (Exit Calibration Mode) Calibration Mode Entered Zero Value Calibrated Full Scale Calibrated 6 Hz 10 Hz 20 Hz 40 Hz 60 Hz 80 Hz 100 Hz 250 Hz Channel Disabled Faulty Calibration Invalid Calibration Reference Configuration Error Open-Circuit Detected Under-Range Detected Over-Range Detected No Error

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

00 01 10

11 0 0 0 1 1 0 1 1

00 01 10

11 0 1

0 0 0 0 0 1 0 1 1

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

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

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NOTE

Bits 1 and 0 indicate origin in Class 1 mode. Bits 15 through 2 contain real data for each channel.

If the module is in Class 3 mode, all 16 bits are real data (depending on the data type).

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Class 3 Status Word

Define To Sel ect Class 1

Data or Status Configuration

Input Type

Data Format

Calibrate

Channel Status

Filter Frequency

Filter frequencies are set in ch 0, 4, 8 and 12 for that channel and the following 3 channels in that group. Filter groupings are:

3) (4

15)

7) (8

and (12

Error Conditions

Data from Channel 0 to 7 Data from Channel 8 to 15 Status for Channel 0 to 7 Status for Channel 8 to 15 ± 10 Vdc or ± 20 mA 1 to 5 Vdc or 4 to 20 mA 0 to 5 Vdc or 0 to 1 mA 0 to 10 Vdc or 0 to 20 mA Engineering Units Scaled-for-PID Proportional Counts 1746-NI4 Data Format User Limit Range 0 User Limit Range 1 User Limit Range 2 User Limit Range 3 Normal RUN Mode (Exit Calibration Mode) Calibration Mode Entered Zero Value Calibrated Full Scale Calibrated 6 Hz 10 Hz 20 Hz 40 Hz 60 Hz 80 Hz

11)

100 Hz 250 Hz Channel Disabled Faulty Calibration Invalid Calibration Reference Configuration Error Open-Circuit Detected Under-Range Detected Over-Range Detected No Error

Channel Configuration, Data, and Status 5-19

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

00 01 10

11 00 01 10 11

000 001 010 011 100 101 110

111 0 0 0 0 0 1 0 1 1 1 0 1

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

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

NOTE

Bits 1 and 0 indicate origin in Class 1 mode. Bits 15 through 2 contain real data for each channel.

If the module is in Class 3 mode, all 16 bits are real data, depending on the data type.

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5-20 Channel Configuration, Data, and Status

Input Word Bit Definitions

NOTE

If the channel whose status you are checking is disabled (bit O:e.x/15 = 0), all bit fields are cleared. The status word for any disabled channel is always 0000 0000 0000 0000 regardless of any previous setting that may have been made to the configuration word in Class 3.

Error Conditions (Bits 15 through 13)

There are eight possible error codes to describe any given state of the 1746-NI16 module. The following table shows the different error codes and their associated bit settings. For more information on the error codes, see “Error Codes” on page 6-5.

Error Condition Bit 15 Bit 14 Bit 13

Channel Disabled 0 0 0 Faulty Calibration 0 0 1 Invalid Calibration Reference 0 1 0 Configuration Error 0 1 1 Open-Circuit Detected 1 0 0 Under-Range Detected 1 0 1 Over-Range Detected 1 1 0 No Error 1 1 1

Filter Frequency (Bits 12 through 10)

The channel filter frequency bits reflects the filter frequency selected in the configuration word. Filter frequencies are active for all current and voltage input types. The filter frequency bits are cleared while the channel is disabled.

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Channel Configuration, Data, and Status 5-21

Calibrate Channel Status (Bits 9 through 7)

The calibrate channel status bits indicate the completion of the calibration process. The code of (0 0 0) indicates that the channel is in the normal run mode or this code can be used to exit the calibration mode. If bit 7 is set to 1, the channel is in the calibration mode. If bit 8 is set to 1, the channel has successfully calibrated the zero reference point. If bit 9 is set to 1, the channel has successfully calibrated the full-scale reference point.

For more information on the calibration procedure, see Appendix D.

Class 1 Handshaking (Bit 6)

Bit 6 is only necessary when in Class 1 mode. Class 3 does not need bit 6 for configuration. While in Class 1, bit 6 is 0, signifying that the channel is ready to receive configuration information. After processing configuration information for that channel bit 6 is set to 1. Bit 6 must cleared (0) to complete the handshaking cycle.

Class 3 Data Format (Bits 6 through 4)

The data format bit field indicates the data format defined for the channel. This field reflects the data format selected in the channel configuration word. The data format field is cleared when the channel is disabled. In Class 3, an extra bit (bit 6) is allotted to indicate which user limit range (0, 1, 2 or 3) was selected.

Class 1 Data Format (Bits 5 and 4)

The data format bit field indicates the data format defined for the channel. This field reflects the data format selected in the channel configuration word. The data format field is cleared when the channel is disabled. In Class 1, only 2 bits describe the data format because user limits ranges are not selectable in Class 1.

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5-22 Channel Configuration, Data, and Status

Input Type (Bits 3 and 2)

The input type bit field indicates what type of input signal the channel is configured for, based on the configuration word. The input type field is cleared when the channel is disabled.

Class 1 Data or Status Configuration (Bits 1 and 0)

When bits 1 and 0 are set to (0 0) or (0 1) in the configuration word, data is being requested from channels 0

reflected in the 8 input words. The module returns a 16-bit value for the channel data which can be used directly. However, the resolution of data in Class 1 is only 14 bits. Bits (1 and 0) are overwritten with the data or status configuration information. Therefore, Class 1 operation reports a 16-bit data value with an error within ±3 LSB of the actual value.

7 or 8

15 in Class 1 to be

In Class 3, the input word reports 16 words of data and 16 words of status information. When data is being reported in Class 3, the data value is a 16-bit integer, whereby all 16 bits are real data, depending on the data type.

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Chapter

Module Diagnostics and Troubleshooting

This chapter describes troubleshooting using the channel status LEDs as well as the module status LED. It explains the types of conditions that might cause an error to be reported and gives suggestions on how to resolve the problem. Major topics include:

module operation vs. channel operation

•

power-up diagnostics

•

channel diagnostics

•

LED indicators

•

channel status error codes

•

troubleshooting flowchart

•

replacement parts

•

contacting Allen-Bradley

•

Module operation vs. Channel Operation

Power-Up Diagnostics

The module performs operations at two levels:

module-level operations

•

channel-level operations

•

Module-level operations include functions such as power-up configuration and communication with the SLC 500 processor.

Channel-level operations describe channel-related functions, such as data conversion and open-circuit detection.

Internal diagnostics are performed at both levels of operation, and any error conditions detected are immediately indicated by the module’s LEDs.

At module power-up, a series of internal diagnostic tests are performed. These diagnostic tests must be completed successfully or a module error results and the module status LED remains off.

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6-2 Module Diagnostics and Troubleshooting

Channel Diagnostics

When a channel is enabled (bit 15=1), a diagnostic check is performed to see that the channel has been properly configured. In addition, the channel is tested on every scan for configuration errors, out-of-range errors, and, for the 4 to 20 mA input type, open-circuit conditions.

A failure of any channel diagnostic test causes the faulted channel status LED to blink. All channel faults are indicated in bits 15 through 13 of the channel’s status word. Channel faults are self-clearing. When the fault conditions are corrected, the channel status LED stops blinking and resume steady illumination.

ATTENTION

If you clear (0) a channel enable bit (15), all channel status information is reset.

Invalid Channel Configuration

Whenever a channel’s configuration word is improperly defined, the channel status LED blinks and the channel status word indicated the type of configuration error in bits 15 through 13. See “Error Codes” on page 6-5.

Configuration errors occur when the data format (bits 8 through 6) in the channel configuration word are invalid.

Out-Of-Range Detection

Whenever the data received at the channel data word is out of the defined operating range, an over-range or under-range error is indicated in the channel status word. See “Error Codes” on page 6-5.

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Module Diagnostics and Troubleshooting 6-3

INPUT

Channel Status LEDs

Module Status LED

0-3

4-7

8-11 12-15

Analog Voltage

Module Status

Channel Status

Open-Circuit Detection

An open-circuit test is performed on all enabled channels configured for 4 to 20 mA input and all enabled channels with voltage configurations. Whenever an open-circuit condition occurs, the channel status LED blinks and the condition is reported in bits 15 through 13 of the channel status word. See “Error Codes” on page 6-5.

Possible causes of an open-circuit include:

The sensing device may be broken.

•

A wire may be loose or cut.

•

The sensing device may not have been installed on the

•

configured channel.

If an open circuit is detected, the channel data word reflects input data as 0 mA in the 4 to 20 mA configuration. For the voltage module, open-circuit data is displayed for all voltage ranges as the maximum value readable in that voltage range. See tables on pages 5-9 and 5-10.

LED Indicators

The module has five LEDs. Four of these are channel status LEDs numbered to correspond to each of the four groups of four input channels (0 to 3, 4 to 7, 8 to 11, 12 to 15). The fifth is a module status LED.

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6-4 Module Diagnostics and Troubleshooting

LED State Tables

Module Status LED

If Module Status LED is:

Indicated condition:

Corrective action:

If Module Status LED is:

Off

All LEDs

And Channel Status LED is:

Blinking

Proper Operation No action required.

Module Fault Cycle power. If condition persists, call your

local distributor or Allen-Bradley for assistance.

Indicated Condition: Corrective action:

Channel Enabled No action required.

Open-Circuit Condition To determine the exact error, check the error

Out-of-Range Condition

Channel Configuration Error

bits in the input image bits (15 through 13). Check the channel configuration word for valid data. Make sure that the data format is indicated correctly in status bits. Class 1 data format status bits are bits 5 and 4. Class 3 data format status bits are bits 6-4. See the “Troubleshooting Flowchart” on page 6-6 and Chapter 5 for more information.

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Power-Up No action required.

Channel Not Enabled No action required. For an example showing

Off

how to enable a channel, see Chapter 2,

, or Chapter 7,

Start

Application Examples

Quick

Module Status LED (Green)

The module status LED is used to indicate module-related diagnostic or operating errors. These

non-recoverable errors

at power-up or during module operation. Once in a module error state, the 1746-NI16 module no longer communicates with the SLC processor. Channel states are disabled, and data words are cleared.

Failure of any diagnostic test results in a non-recoverable error and requires the assistance of your local distributor or Allen-Bradley.

may be detected

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Module Diagnostics and Troubleshooting 6-5

Channel Status LEDs (Green)

The channel status LED is used to indicate channel status and related error information contained in the channel status word. A solid green channel status LED indicates normal operation. The channel status LED blinks to indicate error conditions such as:

channel-related configuration errors

•

open-circuit errors

•

out-of-range errors

•

All channel errors are recoverable errors and after corrective action, normal operation resumes.

Error Codes

Bits 15 through 13 of the channel status word indicate error conditions as described in the table below.

Error Condition Description Bit 15 Bit 14 Bit 13

Channel Disabled

Faulty Calibration

Invalid Calibration Reference

Configuration Error

Open-Circuit Detected

Under-Range Detected

The channel is disabled. 0 0 0 The calibration process was not executed properly. The correct sequence is: (1)

the calibration mode must be entered; (2) zero values must be calibrated; and (3) full-scale values are calibrated. See Appendix D for more detailed information on the calibration procedure.

A value outside the expected calibration range was applied to the channel for either the zero or full-scale calibration range. See Appendix D for more information on calibration value ranges.

An illegal bit pattern was entered in the configuration word (bits 8 through 6). The configuration error bits are cleared when the channel is disabled.

The channel has detected an open circuit at its input. The open-circuit state always takes precedence over the out-of-range error states. There will never be an out-of-range error when an open circuit is detected. The open-circuit error bits are cleared when the channel is disabled or when the open-circuit condition is removed.

The configured channel has detected an under-range of the data on an input channel. The channel data value is set to the lowest defined value for an under-range condition, based on the selected input type’s signal range. The under-range bits are cleared when the channel is disabled.

001

010

011

100

101

Over-Range Detected

No Error

The configured channel has detected an over-range of the data on an input channel. The channel data value is set to the highest defined value for an over-range condition, based on the selected input type’s signal range. The over-range bits are cleared when the channel is disabled.

The channel is operating without any errors. 1 1 1

110

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6-6 Module Diagnostics and Troubleshooting

Troubleshooting Flowchart

Check L E Ds on module.

Module Status

LED off

Module fault

condition

Check to see that module is seated properly in chassis. Cycle power.

Is problem corrected?

Module Status

Ye s

LED on

End

Channel Status

LED(s) blinking

Fault Condition

Check channel

status word

bits 15-13.

Status

Bits (15 to

13)

Pattern (011)

Status

Bits (15 to

13)

Pattern (101)

Channel Status

LED off.

Channel is not

enabled.

Enable channel if desired by setting channel configuration word (Bit 15 = 1). Retry.

Configuration error. Check configuration word for bits 8 to 6 for valid data format configuration. Correct and retry.

Under-range condition exists. The input signal is less than the low scale limit for the channel. Correct and retry.

Channel Status

LED on.

Channel enabled

and working

properly.

End

Yes

Is problem corrected?

Contact your

local distributor

or Allen-Bradley.

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Status

Bits (15 to

13)

Pattern (110)

Status

Bits (15 to

13)

Pattern (100)

Over-range condition exists. The input signal is greater than the upper scale limit for the channel. Correct and retry.

An open-circuit condition is present. Check channel and wiring for open or loose connections. Correct and retry.

Contact your

local distributor

or Allen-Bradley.

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Module Diagnostics and Troubleshooting 6-7

Replacement parts

Contacting Allen-Bradley

The 1746-NI16 module has the following replacement parts:

Part Part Number

Replacement Terminal Block 1746-RT25G

Replacement Terminal Cover 1746-R13

1746-NI16 User Manual 1746-UM001A-US-P

If you need to contact Allen-Bradley for assistance, please have the following information available when you call:

a clear statement of the problem including a description of what

•

the system is actually doing. Note and record the LED states; also, note input and output image words for the module.

a list of things you have already tried to remedy the problem.

•

processor type and firmware (FRN) number. See label on left

•

side of processor. hardware types in the system including I/O modules and

•

chassis. fault code if the SLC processor is faulted.

•

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6-8 Module Diagnostics and Troubleshooting

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Application Examples

Chapter

Operating Classes

This chapter provides two application examples to help you use the analog input module. They are defined as a:

Class 1 example

•

Class 3 example

•

Class 1

The Class 1 example shows how to configure, read status, and read data from the NI16 module. Class 1 mode provides 8 words of input image and 8 words of output image for communicating with the NI16 module. Therefore, this example shows how to multiplex 16 words of configuration data to the module with 8 output image words by utilizing a handshaking scheme. Conversely, it also shows how to read analog data from 16 channels with 8 input image words.

Class 3

The Class 3 example shows how to configure, monitor status, and read data from the NI16 module. Class 3 mode provides 32 words of input image and 32 words of output image, making this mode of operation more desirable. The status for all 16 channels can also be monitored constantly, while reading data from all 16 channels.

Class 1 Example

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The following ladder logic program configures all 16 channels of the 1746-NI16 module in Class 1 mode. It then instructs the analog input module to begin reading data. Class 1 mode should only be used when the controller is a SLC 500 fixed, SLC-5/01, or when the module is located in a remote I/O chassis with a 1747-ASB. The significance of Class 1 mode is that only 8 input words and 8 output words of image are allowed for exchanging data between the SLC controller and the NI16 module. This means that configuration data, status, and actual analog data for the 16 analog channels must be multiplexed using the 8 I/O image words.

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7-2 Application Examples

In contrast, Class 3 mode supports up to 32 I/O image words. Class 3 mode can be utilized with SLC 5/02, 5/03, 5/04, 5/05 and also in a remote ControlNet chassis (1747-ACN, ACNR). No multiplexing of data is required, making configuration and reading of status and analog data more straightforward.

The following ladder program enters subroutine File 3 at power-up. File 3 contains logic to configure all 16 analog channels as well as receive and store the 16 status words for each channel. The status words contain success/failure error codes as well as reflecting back the same configuration information contained in the configuration words for each channel. These status words for 16 analog channels are stored in data table words N7:66 through N7:81 and are bit-mapped. Therefore, to understand them, they must be viewed in the Binary Radix. Refer to Chapter 5 for an explanation of each bit in these words.

File 3 configures analog channels 0 to 7, then as each of these channel configurations complete, it configures analog channels 8 to 15. When all 16 channels are configured, subroutine File 3 is no longer scanned. Rungs 2:2 and 2:3 are then alternately enabled to first read the analog data from channels 0 to 7, then from channels 8 to 15.

The program continues to alternate between reading analog data from the first 8 channels, then the last 8 channels, and then storing the data in 16 consecutive words beginning with N7:50. The 16 analog words from N7:50 through N7:65 are in decimal and for this 0 to 10V dc example are represented by the decimal range 0 to 32767. The reason for the fairly complex ladder logic to configure, read status and then read analog data from the NI16 module in Class 1 mode is due to the need to multiplex 16 channels with 8 I/O words.

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Page 81

Application Examples 7-3

Ladder Files

File 2

Subroutine file 3 is used to configure all 16 channels of the 1746-NI16. This rung allows subroutine 3 to be scanned until all 16 channels are configured. The status words for all 16 channels containing the results of the configuration will be placed consecutively beginning with N7:66.

First Pass

B3:3

S:1

B3:3

JSR

JSR Jump To Subroutine SBR File Number U:3

B3:0 OSR

0000

Once the 16 analog channels are configured, B3/1 is latched to instruct the NI16 module to begin sending analog data to the processor for the first 8 channels. B3/2 is used in the next rung to instruct the module to send data from the last 8 channels. Since there are only 8 input image words in Class 1 mode for receiving data from the 16 channel module, this program toggles between the first and last 8 channels and places the data for all 16 channels consecutively beginning with N7:50.

0001

B3:0

B3:3

B3:0

L 1

The COP Instruction copies Control Words for channels 0 to 7, requesting analog data for those channels. The data is received from the NI16 in input image words I:6.0 through I:6.7, when bits 0 and 1 for each of these input words are both reset. When all 8 inputs are updated, B3/1 is reset and B3/2 is set to read the data for channels 8 to 15.

0002

B3:0

I:6.0

1747-NI16V

I:6.1

1747-NI16V

I:6.2

1747-NI16V

I:6.0

I:6.1

I:6.2

COP

COP Copy File Source #N7:20 Dest #O:6.0 Length 8

MOV

MOV Move Source I:6.0 0< Dest N7:50 0<

MOV

MOV Move Source I:6.1 0< Dest N7:51 0<

MOV

MOV Move Source I:6.2 0< Dest N7:52 0<

B3:4

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7-4 Application Examples

File 2 (Continued)

I:6.3

1746-NI16V

I:6.4

1746-NI16V

I:6.5

1746-NI16V

I:6.3

1746-NI16V

I:6.4

1746-NI16V

I:6.5

1746-NI16V

MOV

MOV Move Source I:6.3 0< Dest N7:53

MOV

MOV Move Source I:6.4 0< Dest N7:54

MOV

MOV Move Source I:6.5

Dest N7:55

B3:4

I:6.6

1746-NI16V

I:6.7

1746-NI16V

I:6.6

1746-NI16V

I:6.7

1746-NI16V

MOV

MOV Move Source I:6.6 0< Dest N7:56 0<

MOV

MOV Move Source I:6.7

Dest N7:57

B3:4

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File 2 (Continued)

Application Examples 7-5

EQU

EQU Equal Source A B3:4

0000000000000000<

Source B 255

The COP Instruction copies Control Words for channels 8 to 15, requesting analog data for those channels. The data is received from the NI16 in input image words I:6.0 through I:6.7, when bit 0 is set and bit 1 is reset for each of these input words. When all 8 inputs have been updated, B3/2 is reset and B3/1 is set to read the data for channels 0 to 7.

0003

B3:0

I:6.0

1746-NI16V

255<

I:6.0

1746-NI16V

CLR

CLR Clear Dest B3:4

0000000000000000<

COP

COP Copy File Source #N7:28 Dest #O:6.0 Length 8

MOV

MOV Move Source I:6.0 0< Dest N7:58 0<

B3:0

L 2

B3:5

L 0

I:6.1

1746-NI16V

I:6.2

1746-NI16V

I:6.1

1746-NI16V

I:6.2

1746-NI16V

MOV

MOV Move Source I:6.1 0< Dest N7:59

MOV

MOV Move Source I:6.2 0< Dest N7:60 0<

B3:5

L 1

B3:5

L 2

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7-6 Application Examples

File 2 (Continued)

I:6.3

1746-NI16V

I:6.4

1746-NI16V

I:6.5

1746-NI16V

I:6.3

1746-NI16V

I:6.4

1746-NI16V

I:6.5

1746-NI16V

MOV

MOV Move Source I:6.3

Dest N7:61

B3:5

MOV

MOV Move Source I:6.4

Dest N7:62

B3:5

MOV

MOV Move Source I:6.5 0< Dest N7:63

L 3

L 4

I:6.6

1746-NI16V

I:6.7

1746-NI16V

I:6.6

1746-NI16V

I:6.7

1746-NI16V

B3:5

MOV

MOV Move Source I:6.6 0< Dest N7:64

B3:5

MOV

MOV Move Source I:6.7 0< Dest N7:65

B3:5

L 5

L 6

L 7

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File 2 (Continued)

Application Examples 7-7

0004

EQU

EQU Equal Source A B3:5

0000000000000000<

Source B 255

255<

CLR

CLR Clear Dest B3:5

0000000000000000<

B3:0

L 1

END

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7-8 Application Examples

File 3

0000

0001

0002

CH 0 and 8 Configuration

Handshake Status Bit

I:6.0

1746-NI16V

CH 0 and 8 Configuration

Handshake Status Bit

I:6.0

1746-NI16V

CH 1 and 9 Configuration

Handshake Status Bit

I:6.1

1746-NI16V

CH 0 Configuration

Complete

B3:2

CH 0 Configuration

Complete

B3:2

CH 1 Configuration

Complete

B3:2

MOV

MOV Move Source N7:0

Dest O:6.0

CH 0 and 8 Configuration

-16142<

Handshake Control Bit

O:6.0

1746-NI16V

Handshake Control Bit

O:6.0

1746-NI16V

CH 0 Configuration Complete

B3:2

L 0

MOV

MOV Move Source I:6.0

Dest N7:66

MOV

MOV Move Source N7:1

-16142< Dest O:6.1

CH 1 and 9 Configuration

Handshake Status Bit

0003

I:6.1

1746-NI16V

Publication 1746-UM001A-US-P

CH 1 Configuration

Complete

B3:2

CH 1 and 9 Configuration

Handshake Control Bit

O:6.1

1746-NI16V

CH 1 and 9 Configuration

Handshake Control Bit

O:6.1

1746-NI16V

CH 1 Configuration Complete

B3:2

L 1

MOV

MOV Move Source I:6.1 0< Dest N7:67

Page 87

File 3 (Continued)

Application Examples 7-9

0004

0005

CH 2 and 10 Configuration

Handshake Status Bit

I:6.2

6 1746-NI16V

CH 2 and 10 Configuration

Handshake Status Bit

I:6.2

6 1746-NI16V

CH 2 Configuration

Comple te

B3:2

CH 2 Configuration

Complete

B3:2

MOV

MOV Move Source N7:2

-16142< Dest O:6.2

CH 2 and 10 Configuration

Handshake Control Bit

CH 2 and 10 Configuration

Handshake Control Bit

CH 2 Configuration

MOV

MOV Move Source I:6.2 0< Dest N7:68

O:6.2

1746-NI16V

O:6.2

1746-NI16V

Complete

B3:2

L 2

0006

0007

CH 3 and 11 Configuration

Handshake Status Bit

I:6.3

6 1746-NI16V

CH 3 and 11 Configuration

Handshake Status Bit

I:6.3

6 1746-NI16V

CH 3 Configuration

Complete

B3:2

CH 3 Configuration

Comple te

B3:2

MOV

MOV Move Source N7:3

Dest O:6.3

Move Source I:6.3 0< Dest N7:69

-16142<

CH 3 and 11 Configuration

Handshake Control Bit

O:6.3

1746-NI16V

CH 3 and 11 Configuration

Handshake Control Bit

O:6.3

1746-NI16V

CH 3 Configuration

Complete

B3:2

L 3

MOV

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7-10 Application Examples

File 3 (Continued)

0008

0009

CH 4 and 12 Configuration

Handshake Status Bit

I:6.4

1746-NI16V

CH 4 and 12 Configuration

Handshake Status Bit

I:6.4

1746-NI16V

CH 4 Configuration

Complete

B3:2

CH 4 Configuration

Complete

B3:2

MOV

MOV Move Source N7:4

-16142< Dest O:6.4

CH 4 and 12 Configuration

Handshake Control Bit

CH 4 and 12 Configuration

Handshake Control Bit

CH 4 Configuration

MOV

MOV Move Source I:6.4 0< Dest N7:70 0<

O:6.4

1746-NI16V

O:6.4

1746-NI16V

Complete

B3:2

L 4

CH 5 and 13 Configuration

Handshake Status Bit

I:6.5

0010

1746-NI16V

Publication 1746-UM001A-US-P

CH 5 Configuration

Complete

B3:2

MOV

MOV Move Source N7:5

-16142< Dest O:6.5

CH 5 and 13 Configuration

Handshake Control Bit

O:6.5

1746-NI16V

Page 89

File 3 (Continued)

Application Examples 7-11

0011

0012

CH 5 and 13 Configuration

Handshake Status Bit

I:6.5

6 1746-NI16V

CH 6 and 14 Configuration

Handshake Status Bit

I:6.6

6 1746-NI16V

CH 5 Configuration

Complete

B3:2

CH 6 Configuration

Complete

B3:2

CH 5 and 13 Configuration

Handshake Control Bit

O:6.5

1746-NI16V

CH 5 Configuration

Complete

B3:2

L 5

MOV

MOV Move Source I:6.5 0< Dest N7:71

MOV

MOV Move Source N7:6

Dest O:6.6

CH 6 and 14 Configuration

Handshake Control Bit

-16142<

O:6.6

1746-NI16V

0013

0014

CH 6 and 14 Configuration

Handshake Status Bit

I:6.6

6 1746-NI16V

CH 7 and 15 Configuration

Handshake Status Bit

I:6.7

6 1746-NI16V

CH 6 Configuration

Complete

B3:2

CH 7 Configuration

Complete

B3:2

CH 6 and 14 Configuration

Handshake Control Bit

O:6.6

1746-NI16V

CH 6 Configuration

Complete

B3:2

L 6

MOV

MOV Move Source I:6.6 0< Dest N7:72

MOV

MOV Move Source N7:7

Dest O:6.7

CH 7 and 15 Configuration

Handshake Control Bit

-16142<

O:6.7

1746-NI16V

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7-12 Application Examples

File 3 (Continued)

0015

0016

0017

0018

CH 7 and 15 Configuration

Handshake Status Bit

I:6.7

1746-NI16V

CH 0 Configuration

Complete

B3:2

CH 0 and 8 Configuration

Handshake Control Bit

O:6.0

1746-NI16V

CH 1 Configuration

Complete

B3:2

CH 7 Configuration

Complete

B3:2

CH 0 and 8 Configuration

Handshake Status Bit

I:6.0

1746-NI16V

CH 0 and 8 Configuration

Handshake Status Bit

I:6.0

1746-NI16V

CH 1 and 9 Configuration

Handshake Status Bit

I:6.1

1746-NI16V

CH 8 Configuration

Complete

B3:2

CH 8 Configuration

Complete

B3:2

CH 9 Configuration

Comple te

B3:2

CH 7 and 15 Configuration

Handshake Control Bit

O:6.7

1746-NI16V

CH 7 Configuration

Complete

B3:2

L 7

MOV

MOV Move Source I:6.7 0< Dest N7:73

MOV

MOV Move Source N7:8

-16141< Dest O:6.0

CH 0 and 8 Configuration

Handshake Control Bit

O:6.0

Move Source I:6.0

Dest N7:74

Move Source N7:9

-16141< Dest O:6.1

1746-NI16V

CH 0 and 8 Configuration

Handshake Control Bit

O:6.0

1746-NI16V

CH 8 Configuration

Complete

B3:2

L 8

MOV

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CH 1 and 9 Configuration

Handshake Control Bit

O:6.1

1746-NI16V

Page 91

File 3 (Continued)

Application Examples 7-13

0019

0020

CH 1 and 9 Configuration

Handshake Control Bit

O:6.1

1746-NI16V

CH 2 Configuration

Complete

B3:2

CH 1 and 9 Configuration

Handshake Status Bit

I:6.1

1746-NI16V

CH 2 and 10 Configuration

Handshake Status Bit

I:6.2

1746-NI16V

CH 9 Configuration

Complete

B3:2

CH 10 Configuration

Complete

B3:2

CH 1 and 9 Configuration

Handshake Control Bit

O:6.1

1746-NI16V

CH 9 Configuration

Complete

B3:2

L 9

MOV

MOV Move Source I:6.1 0< Dest N7:75

MOV

MOV Move Source N7:10

-16141< Dest O:6.2

CH 2 and 10 Configuration

Handshake Control Bit

O:6.2

1746-NI16V

0021

CH 2 and 10 Configuration

Handshake Control Bit

O:6.2

1746-NI16V

CH 2 and 10 Configuration

Handshake Status Bit

I:6.2

1746-NI16V

CH 10 Configuration

Complete

B3:2

CH 2 and 10 Configuration

Handshake Control Bit

O:6.2

1746-NI16V

CH 10 Configuration

Comple te

B3:2

MOV

Move Source I:6.2 0< Dest N7:76

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7-14 Application Examples

File 3 (Continued)

0022

0023

CH 3 Configuration

Complete

B3:2

CH 3 and 11 Configuration

Handshake Control Bit

O:6.3

1746-NI16V

CH 3 and 11 Configuration

Handshake Status Bit

I:6.3

1746-NI16V

CH 3 and 11 Configuration

Handshake Status Bit

I:6.3

1746-NI16V

CH 11 Configuration

Comple te

B3:2

CH 11 Configuration

Comple te

B3:2

MOV

MOV Move Source N7:11

-16141< Dest O:6.3

CH 3 and 11 Configuration

Handshake Control Bit

O:6.3

1746-NI16V

CH 3 and 11 Configuration

Handshake Control Bit

O:6.3

1746-NI16V

CH 11 Configuration

Complete

B3:2

MOV

MOV Move Source I:6.3 0< Dest N7:77

0024

CH 4 Configuration

Comple te

B3:2

CH 4 and 12 Configuration

Handshake Status Bit

I:6.4

1746-NI16V

CH 12 Configuration

Complete

B3:2

MOV

MOV Move Source N7:12

-16141< Dest O:6.4

CH 4 and 12 Configuration

Handshake Control Bit

O:6.4

1746-NI16V

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File 3 (Continued)

Application Examples 7-15

CH 4 and 12 Configuration

Handshake Control Bit

0025

0026

O:6.4

1746-NI16V

CH 5 Configuration

Complete

B3:2

CH 4 and 12 Configuration

Handshake Status Bit

I:6.4

1746-NI16V

CH 5 and 13 Configuration

Handshake Status Bit

I:6.5

6 1746-NI16V

CH 12 Configuration

Comple te

B3:2

CH 13 Configuration

Complete

B3:2

CH 4 and 12 Configuration

Handshake Control Bit

O:6.4

1746-NI16V

CH 12 Configuration

Comple te

B3:2

MOV

MOV Move Source I:6.4 0< Dest N7:78

MOV

MOV Move Source N7:13

-16141< Dest O:6.5

CH 5 and 13 Configuration

Handshake Control Bit

O:6.5

1746-NI16V

0027

0028

CH 5 and 13 Configuration

Handshake Control Bit

O:6.5

1746-NI16V

CH 6 Configuration

Complete

B3:2

CH 5 and 13 Configuration

Handshake Status Bit

I:6.5

6 1746-NI16V

CH 6 and 14 Configuration

Handshake Status Bit

I:6.6

6 1746-NI16V

CH 13 Configuration

Complete

B3:2

CH 14 Configuration

Complete

B3:2

CH 5 and 13 Configuration

Handshake Control Bit

O:6.5

1746-NI16V

CH 13 Configuration

Complete

B3:2

MOV

MOV Move Source I:6.5 0< Dest N7:79

MOV

MOV Move Source N7:14

-16141< Dest O:6.6

CH 6 and 14 Configuration

Handshake Control Bit

O:6.6

1746-NI16V

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7-16 Application Examples

File 3 (Continued)

CH 6 and 14 Configuration

0029

0030

Handshake Control Bit

O:6.6

1746-NI16V

CH 7 Configuration

Complete

B3:2

CH 6 and 14 Configuration

Handshake Status Bit

I:6.6

1746-NI16V

CH 7 and 15 Configuration

Handshake Status Bit

I:6.7

1746-NI16V

CH 14 Configuration

Complete

B3:2

CH 15 Configuration

Complete

B3:2

CH 6 and 14 Configuration

Handshake Control Bit

O:6.6

1746-NI16V

CH 14 Configuration

Complete

B3:2

MOV

MOV Move Source I:6.6 0< Dest N7:80

MOV

MOV Move Source N7:15

-16141< Dest O:6.7

CH 7 and 15 Configuration

Handshake Control Bit

O:6.7

1746-NI16V

0031

CH 7 and 15 Configuration

Handshake Control Bit

O:6.7

1746-NI16V

CH 7 and 15 Configuration

Handshake Status Bit

I:6.7

1746-NI16V

CH 15 Configuration

Comple te

B3:2

CH 7 and 15 Configuration

Handshake Control Bit

O:6.7

1746-NI16V

CH 15 Configuration

Comple te

B3:2

MOV

MOV Move Source I:6.7 0< Dest N7:81

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File 3 (Continued)

Application Examples 7-17

0032

0033

0034

B3:3

CH 8 Configuration

Complete

B3:2

CH 14 Configuration

Complete

B3:2

CH 9 Configuration

Complete

B3:2

CH 15 Configuration

Comple te

B3:2

B3:3

CH 10 Configuration

Comple te

B3:2

CH 11 Configuration

Complete

B3:2

CH 12 Configuration

Comple te

B3:2

CH 13 Configuration

Complete

B3:2

CLR

CLR Clear Dest B3:2

0000000000000000<

B3:3

L 0

B3:3

END

The following table shows configuration and control words for the ladder program. The table is showing integer file N7 in the Decimal Radix. Words N7:0 through N7:15 contain the configuration words for analog channels 0 to 15 to send analog data to the controller. These configurations and control words must be viewed in the Binary Radix because they are bit-mapped. Please refer to Chapter 5, Channel Configuration, Data and Status for an explanation of each bit in these words. For this example, each channel has been configured for 0 to 10vdc, 1746-NI14 data format and a filter frequency of 60 Hz.

Data File N7

Offset0123456789

N7:0 -16142 -16142 -16142 -16142 -16142 -16142 -16142 -16142 -16141 -16141 N7:10-16141-16141-16141-16141-16141-161410000 N7:20 -32768 -32768 -32768 -32768 -32768 -32768 -32768 -32768 -32767 -32767 N7:30-32767-32767-32767-32767-32767-327670000

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7-18 Application Examples

Class 3 Example

The following ladder logic program configures all 16 channels of a 1747-NI16 analog input module. It then monitors the module status information and uses the analog data from the 16 channels when status for each channel is good. In Class 3 mode, the processor can read/write up to 32 I/O words from the module. In this mode, the SLC 5/02 or later processor can configure all 16 channels with one COPY instruction. In addition, one copy instruction can be used to constantly monitor status and, at the same time, a second copy instruction can be used to bring the analog data into the SLC processor. The status data can then be used to qualify the ladder rungs that use the analog data. This ensures that the data is not used if configuration errors, open-circuit conditions, or over- and under-voltage conditions exist.

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Application Examples 7-19

Ladder File 2

At power-up, clear the input image table for the NI16 to be sure old status and analog data is not used and then copy the configuration words for each of the analog modules’16 channels. These configuration words are stored from N7:0 through N7:15.

First Pass

0000

S:1

Continually read the 16 status words for the 16 analog channels and store them in data table words N7:61. These words contain “Error Conditions” for each channel, which are monitored in the following 16 rungs to determine if the data is valid before using it. These “Error Condition” bits are 13, 14, and 15 of each channel status word, i.e. they must all be set to indicate “No Error” for each channel.

0001

This rung and the following 15 rungs copy the analog data from the 1746-NI16 module’s 16 channels. The data is moved and is therefore considered valid only when the channels associated status word “Error Condition” bits (13 to 15) are all set indicating “No Error”.

0002

N7:4613N7:4614N7:46

FLL

FLL Fill File Source 0 Dest #I:6.0 Length 32

COP

COP Copy File Source #N7:0 Dest #O:6.0 Length 16

Copy File Source #I:6.16 Dest #N7:46 Length 16

Move Source I:6.0 0< Dest N7:30

COP

MOV

0003

0004

0005

0006

0007

N7:4713N7:4714N7:47

N7:4813N7:4814N7:48

N7:4913N7:4914N7:49

N7:5013N7:5014N7:50

N7:5113N7:5114N7:51

MOV

MOV Move Source I:6.1 0< Dest N7:31

MOV

MOV Move Source I:6.2

Dest N7:32

MOV

MOV Move Source I:6.3

Dest N7:33

MOV

MOV Move Source I:6.4

Dest N7:34

MOV

MOV Move Source I:6.5

Dest N7:35

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7-20 Application Examples

File 2 (Continued)

0008

0009

0010

0011

0012

0013

N7:5213N7:5214N7:52

N7:5313N7:5314N7:53

N7:5413N7:5414N7:54

N7:5513N7:5514N7:55

N7:5613N7:5614N7:56

N7:5713N7:5714N7:57

MOV

MOV Move Source I:6.6

Dest N7:36

MOV

MOV Move Source I:6.7

Dest N7:37

MOV

MOV Move Source I:6.8

Dest N7:38

MOV

MOV Move Source I:6.9

Dest N7:39

MOV

MOV Move Source I:6.10

Dest N7:40

MOV

MOV Move Source I:6.11

Dest N7:41

0014

0015

0016

0017

0018

N7:5813N7:5814N7:58

N7:5913N7:5914N7:59

N7:6013N7:6014N7:60

N7:6113N7:6114N7:61

MOV

MOV Move Source I:6.12

Dest N7:42

MOV

MOV Move Source I:6.13

Dest N7:43

MOV

MOV Move Source I:6.14

Dest N7:44

MOV

MOV Move Source I:6.15

Dest N7:45

END

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Application Examples 7-21

Data File N7

The table below is Data Table File N7. Words N7:0 through N7:15 are the configuration words for channels 0 through 15 of the NI16 module in the decimal radix. Refer to Chapter 5, Channel Configuration, Data and Status for an explanation of each bit in these words. Since this is bit-mapped data, it must be viewed in the binary radix. For this example, each analog channel has been configured for ± 10Vdc input type, a data format of 1746-NI4 and a filter frequency of 60Hz.

offset0123456789

N7:0 -16192 -161992 -16192 -16192 -16192 -16192 -16192 -16192 -16192 -16192 N7:10 -16192 -16192 -16192 -16192 -16192 -16192

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7-22 Application Examples

Publication 1746-UM001A-US-P

Rockwell Automation 1746-NI16V User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

Important User Information

Table of Contents

Preface

who should use this manual

Purpose of this Manual

Common Techniques Used in this Manual

Allen-Bradley Support

General Description

System Overview

Required Tools and Equipment

Procedures

Hazardous Location Considerations

Environnements dangereux

Electrostatic Damage

1746-NI16 Power Requirements

Module Location in Chassis

Compliance to European Union Directives

Module Installation and Removal

Terminal Wiring

Input Devices

Module ID Code

Class 1 and Class 3 Interface

Module Addressing

Module Update Time

Channel Filter Frequency Selection

Response to Slot Disabling

Channel Configuration

Output Image Channel Configuration Procedure

Input Image - Channel Data Word

Scaling the Channel Data Word

Channel Status Checking

Class 1 Status Word

Class 3 Status Word

Input Word Bit Definitions

module operation vs. channel operation

power-up diagnostics

Channel Diagnostics

LED Indicators

Error Codes

Troubleshooting Flowchart

Replacement parts

Contacting Allen-Bradley

Operating Classes

Class 1 example

Class 3 Example