Spectrum Controls 1769sc-IF4IH User Manual

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User's Manual 0300215-03 Rev. A

User's Manual 0300215-03 Rev . A

Compact™ I/O Isolated HART Analog Module

Catalog Number: 1769sc-IF4IH

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User's Manual 0300215-03 Rev. A

Table of Contents

TABLE OF CONTENTS ............................................................................................................................................ I

CHAPTER 1 MODULE OVERVIEW .................................................................................................................. 1-1

SECTION 1.1GENERAL DESCRIPTION .................................................................................................................... 1-1

SECTION 1.2DATA FORMATS ................................................................................................................................. 1-1

SECTION 1.3FILTER FREQUENCIES ........................................................................................................................ 1-2

SECTION 1.4HARDWARE FEATURES ...................................................................................................................... 1-2

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

SECTION 1.5SYSTEM OVERVIEW........................................................................................................................... 1-3

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

SECTION 1.6MODULE OPERATION ........................................................................................................................ 1-4

CHAPTER 2 QUICK START FOR EXPERIENCED USERS ........................................................................... 2-1

SECTION 2.1BEFORE YOU BEGIN .......................................................................................................................... 2-1

SECTION 2.2REQUIRED TOOLS AND EQUIPMENT .................................................................................................. 2-1

SECTION 2.3WHAT YOU NEED TO DO .................................................................................................................. 2-1

CHAPTER 3 INSTALLATION AND WIRING ................................................................................................... 3-1

SECTION 3.1COMPLIANCE TO EUROPEAN UNION DIRECTIVES ............................................................................. 3-1

3.1.1 EMC Directive .......................................................................................................................................... 3-1

3.1.2 Low Voltage Directive .............................................................................................................................. 3-1

3.1.3 CE Safety .................................................................................................................................................. 3-1

SECTION 3.2POWER REQUIREMENTS .................................................................................................................... 3-2

SECTION 3.3GENERAL CONSIDERATIONS .............................................................................................................. 3-2

3.3.1 Hazardous Location Considerations ........................................................................................................ 3-2

3.3.2 Prevent Electrostatic Discharge ............................................................................................................... 3-2

3.3.3 Remove Power .......................................................................................................................................... 3-3

3.3.4 Selecting a Location ................................................................................................................................. 3-3

SECTION 3.4SYSTEM ASSEMBLY ........................................................................................................................... 3-4

SECTION 3.5MOUNTING ......................................................................................................................................... 3-5

3.5.1 Minimum Spacing ..................................................................................................................................... 3-5

3.5.2 Panel Mounting ........................................................................................................................................ 3-5

3.5.3 DIN Rail Mounting ................................................................................................................................... 3-6

SECTION 3.6REPLACING A SINGLE MODULE WITHIN A SYSTEM ........................................................................... 3-7

SECTION 3.7FIELD WIRING CONNECTIONS &SYSTEM WIRING GUIDELINES ...................................................... 3-7

3.7.2 Terminal Door Label ................................................................................................................................ 3-8

3.7.3 Removing and Replacing the Terminal Block ........................................................................................... 3-8

3.7.4 Wiring the Finger-Safe Terminal Block .................................................................................................... 3-8

3.7.5 Wiring the Module .................................................................................................................................... 3-9

3.7.6 Wiring Diagram ...................................................................................................................................... 3-10

3.7.7 Calibration.............................................................................................................................................. 3-10

CHAPTER 4 CONFIGURING THE IF4IH FOR COMPACTLOGIX USING RSLOGIX 5000 ................... 4-1

SECTION 4.1SETTING UP THE GENERIC PROFILE ................................................................................................... 4-1

SECTION 4.2USING THE ADD-ON PROFILE ............................................................................................................ 4- 5

4.2.1 Installing the Add-On profile .................................................................................................................... 4-5

4.2.2 Adding the IF4IH Module To Your Logix Project .................................................................................... 4-6

SECTION 4.3USER DEFINED DATA TYPES ............................................................................................................. 4-7

SECTION 4.4PROJECT TAGS ................................................................................................................................... 4-8

SECTION 4.5SAMPL E PROJECT LADDER ................................................................................................................. 4-9

CHAPTER 5 CONFIGURING THE IF4IH FOR A MICROLOGIX 1500 USING RSLOGIX 500 .............. 5-1

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ECTION 5.1MODULE ADDRESSING ...................................................................................................................... 5-1

SECTION 5.2CONFIGURING THE 1769SC-IF4IH IN A MICROLOGIX 1500SYSTEM ............................................... 5-2

SECTION 5.3USING THE LADDER SAMPL E ............................................................................................................. 5-6

5.3.1 Copying Subroutines from the Sample Project ......................................................................................... 5-6

5.3.2 Copying Ladder from the Sample Project................................................................................................. 5-7

5.3.3 Importing Tag Database and Rung Comments ......................................................................................... 5-8

CHAPTER 6 MODULE DATA, STATUS, AND CHANNEL CONFIGURATION ......................................... 6-1

SECTION 6.1MODULE MEMORY MAP ................................................................................................................... 6-1

SECTION 6.2ACCESSING INPUT IMAGE FILE DATA ................................................................................................ 6-2

SECTION 6.3INPUT DATA FILE ............................................................................................................................... 6-2

6.3.1 Input Data Values (Words 0 to 3) ............................................................................................................. 6-2

6.3.2 Time Stamp Value (Word 4)...................................................................................................................... 6-2

6.3.3 General Status Bits S0 to S3 (Word 5) ...................................................................................................... 6-2

6.3.4 Out of Service Status Bits OS0 to OS3 (Word 5) ...................................................................................... 6-3

6.3.5 Over-Range Flag Bits O0 to O3 (Word 6) ................................................................................................ 6-3

6.3.6 Under-Range Flag Bits U0 to U3 (Word 6) .............................................................................................. 6-3

6.3.7 High Process Alarm Flag Bits H0 to H3 (Word 6) ................................................................................... 6-3

6.3.8 Low Process Alarm Flag Bits L0 to L3 (Word 6) ..................................................................................... 6-4

6.3.9 Pad (Word 7) ............................................................................................................................................ 6-4

6.3.10 HART Data (Words 8 to 27) ................................................................................................................... 6-4

6.3.11 Message Slave Control (Word 28) .......................................................................................................... 6-4

6.3.12 Message Reply Size (Word 29) ............................................................................................................... 6-4

6.3.13 Message Reply Buffer (Words 30…49) ................................................................................................... 6-4

6.3.14 Reserved (Words 50…71) ....................................................................................................................... 6-4

SECTION 6.4MODULE CONFIGURATION ................................................................................................................ 6-5

6.4.1 Real Time Sample Value (Word 0)............................................................................................................ 6-6

6.4.2 General Configuration Bits (Word 1) ....................................................................................................... 6-6

6.4.3 Filter Frequency and General Settings (Words 2, 8, 14, 20) .................................................................... 6-7

6.4.4 Input Type and Data Format (Words 3, 9, 15, 21) ................................................................................. 6-11

6.4.5 Process Alarm High Setpoint (Word s 4, 10, 16, 22) ............................................................................... 6-13

6.4.6 Process Alarm Low Setpoint (Words 5, 11, 17, 23) ................................................................................ 6-13

6.4.7 Process Alarm Deadband (Words 6, 12, 18, 24) .................................................................................... 6-13

6.4.8 Pad (Words 7, 13, 19, 25) ....................................................................................................................... 6-14

6.4.9 Channel X HART Slot Variables 0 & 1 (Words 26, 28, 30, 32) .............................................................. 6-14

6.4.10 Channel X HART Slot Variables 2 & 3 (Words 25, 27, 31, 33) ............................................................ 6-14

SECTION 6.5OUTPUT DATA FILE ......................................................................................................................... 6-15

6.5.1 Unlatch Process High Alarms UH0 to UH3 (Word 0) ........................................................................... 6-15

6.5.2 Unlatch Process Low Alarms UL0 to UL3 (Word 0) .............................................................................. 6-15

6.5.3 Hart Suspend HS0 to HS3 (Word 0) ....................................................................................................... 6-15

6.5.4 Packet Just Scanned (Word 1) ................................................................................................................ 6-15

6.5.5 Message Master Control (Word 2) ......................................................................................................... 6-16

6.5.6 Message Request Size (Word 3) .............................................................................................................. 6-16

6.5.7 Message Request Buffer (Words 4…23) ................................................................................................. 6-16

6.5.8 Reserved (Words 24…45) ....................................................................................................................... 6-16

SECTION 6.6DETERMINING EFFECTIVE RESOLUTION AND RANGE .................................................................... 6-17

SECTION 6.7DETERMINING MODULE UPDATE TIME .......................................................................................... 6-18

6.7.1 Calculating Module Update Time ........................................................................................................... 6-18

CHAPTER 7 ENABLING AND USING HART ON THE 1769SC-IF4IH ......................................................... 7-1

SECTION 7.1CONFIGURING THE MODULE FOR HART ........................................................................................... 7-1

7.1.1 Configuring the IF4IH Module for (Hart Acquisition/Communication)................................................... 7-1

SECTION 7.2HART PACKET DATA ........................................................................................................................ 7-2

7.2.1 How the Module Connects to a Field Device ........................................................................................... 7-2

7.2.2 Auto Acquisition........................................................................................................................................ 7-3

7.2.3 Packet Interval ........................................................................................................................................ 7-10

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ECTION 7.3SENDING AND RECEIVING MESSAGES .............................................................................................. 7-11

7.3.1 Module Output Tags Used For Messaging ............................................................................................. 7-11

7.3.2 Module Input Tags Used For Messaging ................................................................................................ 7-12

7.3.3 Processing a Message ............................................................................................................................. 7-13

SECTION 7.4MODULE SPECIFIC COMMANDS ....................................................................................................... 7-30

7.4.1 Get HART Device Information ............................................................................................................... 7-30

7.4.2 HART Channel Suspension and Resume ................................................................................................. 7-33

7.4.3 HART Pass-Through Command ............................................................................................................. 7-34

SECTION 7.5HART PROTOCOL OVERVIEW ......................................................................................................... 7-43

7.5.1 Message Format ..................................................................................................................................... 7-43

7.5.2 Sending a HART Command to a Field Device via Pass-through ........................................................... 7-45

CHAPTER 8 PROGRAMMING EXAMPLES .................................................................................................... 8-1

SECTION 8.1COMPACTLOGIX ................................................................................................................................ 8-1

8.1.1 Reset/Reconfig .......................................................................................................................................... 8-1

8.1.2 Swap Byte Order ....................................................................................................................................... 8-3

8.1.3 Converting Unpacked ASCII to Packed ASCI I ......................................................................................... 8-3

SECTION 8.2MICROLOGIX 1500 ............................................................................................................................ 8-6

8.2.1 MAIN Routine ........................................................................................................................................... 8-7

8.2.2 PACKETS Routine .................................................................................................................................... 8-8

8.2.3 MSG_TO_MOD Routine ........................................................................................................................ 8-11

8.2.4 SRC_CHECK Routine ............................................................................................................................ 8-28

8.2.5 DEST_CHECKSUM Routine .................................................................................................................. 8-30

8.2.6 HART_MSG Routine ............................................................................................................................... 8-32

8.2.7 WORD_BYTE Routine ............................................................................................................................ 8-43

8.2.8 HART_CHECK Routine .......................................................................................................................... 8-46

8.2.9 BYTE_WORD Routine ............................................................................................................................ 8-48

CHAPTER 9 DIAGNOSTICS AND TROUBLESHOOTING ............................................................................ 9-1

SECTION 9.1SAFETY CONSIDERATIONS................................................................................................................. 9-1

9.1.1 Indicator Lights ........................................................................................................................................ 9-1

9.1.2 Stand Clear of Equipment ......................................................................................................................... 9-1

9.1.3 Program Alteration ................................................................................................................................... 9-1

9.1.4 Safety Circuits ........................................................................................................................................... 9-1

SECTION 9.2MODULE OPERATION VS.CHANNEL OPERATION .............................................................................. 9-2

SECTION 9.3POWER-UP DIAGNOSTICS .................................................................................................................. 9-2

SECTION 9.4CHANNEL DIAGNOSTICS .................................................................................................................... 9-2

9.4.1 Invalid Channel Configuration Detection ................................................................................................ 9-2

9.4.2 Over or Under-Range Detection ............................................................................................................... 9-3

SECTION 9.5NON-CRITICAL VS.CRITICAL MODULE ERRORS ............................................................................... 9-3

SECTION 9.6MODULE ERROR DEFINITION TABLE ................................................................................................. 9-3

9.6.1 Module Error Field................................................................................................................................... 9-3

9.6.2 Extended Error Information Field ............................................................................................................ 9-4

SECTION 9.7ERROR CODES .................................................................................................................................... 9-4

SECTION 9.8MODULE INHIBIT FUNCTION ............................................................................................................. 9-5

APPENDIX A MODULE SPECIFICATIONS .................................................................................................... A-1

SECTION A.1 ELECTRICAL SPECIFICATIONS .......................................................................................................... A-1

SECTION A.2 ENVIRONMENTAL SPECIFICATIONS ................................................................................................. A- 2

SECTION A.3 REGULATORY COMPLIANCE ............................................................................................................ A-3

APPENDIX B HART UNIVERSAL AND COMMON PRACTICE COMMANDS ......................................... B-1

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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 t his manual

• How to use this manual

• Related publications

• Conventions used in this manual

• Rockwell Automation support

Who Should Use This Manual

Use this manual if you are responsible for designing, installing, programming, or troubleshooting control systems that use Allen-Bradle y Compact™ I/O and/or compatible controllers, such as MicroLogix 1500 or CompactLogix.

How to Use This Manual

As much as possible, we organized this manual to explain, in a task-by-task manner, how to install, configure, program, operate and troubleshoot a control system using the 1769sc-IF4IH.

Related Documentation

The table below provides a listing of publications that contain important information about MicroLogix 1500 syste ms.

Document Title Document Number

MicroLogix™ 1500 User Manual 1764-UM001A-US-P 1769 Compact Discrete Input/Output Modules Product Data

1769-2.1

MicroLogix™ 1500 System Overview 1764-SO001B-EN-P Compact™ I/O System Overview 1769-SO001A-EN-P CompactLogix User Manual 1769-UM007B-EN-P Allen-Bradley Programmable Controller Grounding and Wiring Guidelines

1770-4.1

If you would like a manual, you can:

• Download a free electronic version from the internet at www.theautomationbookstore.com

• Purchase a printed manual by:

o Contacting your local distributor or Rockwell Automation representative o Visiting www.theautomationbookstore.com and placing your order o Calling 1.800.963.9548 (USA/Canada) or 001.330.725.1574 (Outside

USA/Canada)

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Conventions Used in This Manual

The following conventions are used throughout this manual:

• Bulleted lists (like this one) provide information not procedural steps.

• Numbered lists provide sequential steps or hierarchical information.

• Italic type is used for emphasis

• Bold type identifies headings and sub-headings

•

Attention

Are used to identify critical information to the reader

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Chapter 1 Module Overview

This chapter describes the 1769sc-IF4IH isolated HART analog input module and explains how the module reads current, voltage, and current wit h H ART input data.

Included is information about:

• The module’s hardware and diagnostic features

• An overview of the system and module operation

Section 1.1 General Description

The IF4IH is a four channel isolated module that allows each channel to be configured independently for either current, voltage, or current with HART communication. The module digitally converts and stores analog data from any combination mentioned above as well as HART data for channels configured for HART. Each input channel is individually configured via software for a specific input device, data forma t and filter frequency, and provides over-range and under-range detection and indication.

The tables below list the input types and their associated ranges.

Table 1-1

Current Input Types

0 t o 20mA 4mA to 20mA

Table 1-2

Volt age Input Types

± 10 V 0 to 10 V 0 t o 5 V 1 t o 5 V

Section 1.2 Data Formats

The data can be configured on board each module as:

• Engineering un it s

• Scaled-for-PID

• Percent of full-scale

• Raw/proportional data

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Section 1.3 Filter Frequencies

The module uses a digital filter that provides high frequency noise rejection for the input signals. The filter is programmable, allowing you to select from five different filter frequencies for each channel:

• 28.5 Hz

• 50 Hz

• 60 Hz

• 300 Hz

• 360 Hz

Section 1.4 Hardware Features

The module contains a removable terminal block. Channels are wired as differential inputs (i.e. each channel will have a dedicated ground).

Note: A jumper must be installed on the terminal block between CH- and CH-iRtn for all current input ranges.

Module configuration is done via the controller’s programming software. In addition, some controllers support configuration via the user program. In either case, the module configuration is stored in the memory of the controller. Refer to your controller’s user manual for more information. The illustration below shows the module’s hardware features.

Figure 1-1

HART

10a

10b

DANGER

Do Not Remov e RTB Under Power Unless Are a is No nHazardous

Ensure Adjacent Bus Lever is Unlatched/ Latched Before/After Removing/I nserting Module

HART

Item Description

1 bus lever 2a upper panel mounting tab 2b lower panel mounting tab 3 module status LED 4 module door with terminal identification label

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5a movable bus connector (bus interface) with female pins 5b stationary bus connector (bus interface) with male pins 6 nameplate label 7a upper tongue-and-groove slots 7b lower tongue-and-groove slots 8a upper DIN rail latch 8b lower DIN rail latch 9 write-on label for user identification tags 10 removable termi nal block (RTB) with finger-safe cover 10a RTB upper retaining screw 10b RTB lower retaining screw

1.4.1 General Diagnostic Features

The module contains a diagnostic LED that helps you identify the source of problems that may occur during power-up or during normal channel operation. The LED indicates both status and power. Power-up and channel diagnostics are explained in Chapter 9 Diagnostics and Troubleshooting.

Section 1.5 System Overview

The modules communicate to the controller through the bus interface. The modules also receive 5 and 24V dc power through the bus interface.

1.5.1 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 power-up diagnostic s, the module status LED is turned on.

After power-up checks are complete, the module waits for valid channel configuration data. If an invalid configuration is detected, the module generates a configuration error. Once a channel is properly configured and enabled, it continuously converts the input data to a value within the range selected for that channel.

Each time a channel is read by the input module, that data value is tested by the module for an over-range, under-range, open-circuit, or “i nput data not valid” condition. If such a condition is detected, a unique bit is set in the channel status word. The channel status word is described in Section 6.3 Input Data File.

Using the module image table, the controller reads the two’s comp lement binary converted input data from the module. This typically occurs at the end of the program scan or when commanded by the control program. If the controller and the module determine that the data transfer has been made without error, the data is used in the control program.

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Section 1.6 Module Operation

When the module receives the input from an analog device, the module’s circuitry multiplexes the input into an A/D converter. The converter reads the signal and converts it as required for the type of input. If HART is enabled on a channel, the HART data is acquired my means of an onboard HART mode m.

Note: The HART data is acquired asynchronously from the analog acquisition process and therefore does not directly effect the analog update time.

See the block diagram below.

Figure 1-2

The module is designed to support up to 4 isolated channels which can be independe ntly configured for voltage, current, or current with HART. The module converts the analog values directly into digital counts which are viewed and accessed from within the PLC via controller input tags.

The HART data, if enabled, is converted directly to a block of twent y controller input tags. The data within this block of twenty tags is multiplexed. For information on HART and how to demultiplex the HART data, refer to Chapter 7.

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Chapter 2 Quick Start for Experienced Users

Section 2.1 Before You Begin

This chapter can help you get started using the 1769sc-IF4IH isolated HART analog input module. We base the procedures here on the assumption that you have an understanding of Allen-Bradley controllers. 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.

Because it is a start-up guide for experienced users, this chapter does no t 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.

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.

Section 2.2 Required Tools and Equipment

Have the following tools and equipment ready:

• Medium blade or cross-head screwdriver

• Analog input device

• Shielded, twisted-pair cable for wiring (Belden™ 8761 or equivalent for voltage and

current inputs)

• Controller (for example, a MicroLogix™ 1500 or CompactLogix™ controller)

• Programming device and software (for example, RSLogix 500™ or RSLogix

5000™)

Section 2.3 What You Need To Do

This chapter covers:

1. Ensuring that your power supply is adequate

2. Attaching and locking the module

3. Wiring the module

4. Configuring the module

5. Going through the startup procedure

6. Monitoring module operation

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Step 1: Ensure that your 1769 system power supply

has sufficient current output to support your system configuration. Reference

Chapter 3 (Installation and Wiring)

The modules maximum current draw is shown below: 5V dc 24V dc

175 mA 60 mA

NOTE: The module cannot be located more than 8 modules away from the system power supply.

Step 2: Attach and lock the module. Reference

Chapter 3 (Installation and Wiring)

Remove power before removing or inserting this module. If you remove or insert a module with power applied an electrical arc may occur.

NOTE: The module can be panel or DIN rail mounted. Modules can be assembled before or after mounting.

Attention

Remove power before removing or inserting this module. If you remove or insert a module with power applied an electrical arc may occur.

1. Check that the bus lever of the module to be installed is in the unlocked (fully right)

position.

2. Use the upper and lower tongue-and-groove slots (1) to secure the modules together

(or to a controller).

3. Move the module back along the tongue-and-groove slots until the bus connectors

(2) line up with each other.

4. Push the bus lever back slightly to clear the positioning tab (3). Use your fingers or a

small screwdriver.

The system power supply could be a 1769-PA2, -PB2, -PA4, -PB4, or the internal supply of the MicroLogix 1500

packaged controller.

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5. To allow communication between the controller and module, move the bus lever

fully to the left (4) until it clicks. Ensure it is locked firmly in place.

6. Attach a n end cap terminator (5) to the last module in the system by using the

tongue-and-groove slots as before.

7. Lock the end cap bus terminator (6).

Attention

When attaching I/O modules it is very important that the bus connectors are securely locked together to ensure proper electrical connection.

Attention

A 1769-ECR or 1769-ECL right or left end cap respectively must be used to terminate the end of the 1769 communication bus.

Step 3: Wire the module. Reference

Chapter 3 (Installation and Wiring)

Follow the guidelines below when wiring the module.

General

• Power and input wiring must be in accordance with Class 1, Division 2 wiring

methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in accordance with the authority having jurisdiction.

• Channels are isolated from one another by ±500V dc maximum.

• Route field wiring away from any other wiring and keep it as far as possible from

sources of electrical noise, such as motors, transformers, contactors, and ac devices. As a general rule, allow at least 15.2 cm (6 in.) of separation for every 120V of power.

• Routing field wiring in a grounded conduit can reduce electrical noise.

• If field wiring must cross ac or power cables, ensure that they cross at right angles.

Terminal Block

• For voltage and current sensors, use Belden 8761 shielded, twisted-pair wire (or

equivalent) to ensure proper operation and high immunity to electrical noise.

• To ensure optimum accuracy, limit overall cable impedance by keeping a cable as

short as possible. Locate the module as close to input devices as the application permits.

Grounding

• This product is intended to be mounted to a well-grounded mounting surface such as

a metal panel. Additional grounding connections from the module’s mounting tabs or DIN rail (if used) are not required unless the mounting surface cannot be grounded.

• Keep cable shield connections to ground as short as possible.

• Ground the shield drain wire at one end only. The preferred location is as follows.

• Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley

publication 1770-4.1, for additional information.

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The terminal block layout is shown below:

Figure 2-1

N/C

Ch1-iRtn

N/C

Ch3-iRtn

Ch0+

N/C

Ch0-iRtn Ch0-

Ch1+

N/C

Ch2-iRtn Ch2-

Ch3+

Ch3-

N/C N/C

Ch2+

Ch1-

Step 4: Configure the module for the proper controller.

Reference

Chapter 4 (Configuring the IF4IH for

CompactLogix Using RSLogix 5000) or Chapter 5 (Configuring the IF4IH for a MicroLogix 1500 Using RSLogix 500)

Step 5: Configure the module. Reference

Chapter 6 (Module Data, Status, and

Channel Configuration)

The configuration file is typically modified using the programming software compatible with your controller. It can also be modified through the control program, if supported by the controller. See Section 6.4 Module Configuration for more information.

Step 6: Go through the startup procedure. Reference

Chapter 9 (Diagnostics and

Troubleshooting)

1. Apply power to the controller system.

2. Download your program, which contains the Isolated HART module configuration

settings, to the controller.

3. Put the controller in Run mode. During a normal start-up, the module status LED

turns on.

NOTE: If the module status LED does not turn on, cycle power. If the conditio n persists, contact your local distributor or Spectrum Controls for assistance.

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Step 7: Monitor the module status to check if the module is operating correctly Reference

Chapter 9 (Diagnostics and Troubleshooting)

Module and channel configuration errors are reported to the controller. These errors are typically reported in the controller’s I/O status file. Channel status data is also reported in the module’s input data table, so these bits can be used in your control program to flag a channel error.

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Chapter 3 Installation and Wiring

This chapter explains how to:

• Determine the power requirements for the module

• Avoid electrostatic damage

• Install the module

• Wire the module’s terminal block

• Wire input devices

Section 3.1 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.

3.1.1 EMC Directive

The 1769sc-IF4IH 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.

3.1.2 Low Voltage Directive

This product is tested to meet Council Directive 73/23/EEC Low Voltage, by applying the safety requirements of EN 61131-2 Programmable Controllers, Part 2 – Equipment Requirements and Tests. For specific information required by EN61131-2, see the appropriate sections in this publication, as well as the following Allen-Bradley publications:

• Industrial Automation, Wiring and Grounding Guidelines for Noise Immunity,

publication 1770-4.1

• Automation Systems Catalog, p ublication B113

3.1.3 CE Safety

This product is designed to, and verified compliance with, European Union Safety Standards:

• EN61131-2

• EN61010-1

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Section 3.2 Power Requirements

The module receives power through the bus inter face from the +5V dc/ +24V dc system power supply. The maximum current drawn by the module is shown in the table below.

Module Current Draw at 5V dc at 24V dc 175 mA 60 mA

Section 3.3 General Considerations

Compact I/O is suitable for use in an industrial environment when installed in accordance with these instructions. Specifically, this equipment is intended for use in clean, dry environments (Pollution degree 2

and to circuits not exceeding Over Voltage Category

(IEC 60664-1)

3.3.1 Hazardous Location Considerations

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

Attention

· EXPLOSION HAZARD

· Substitution of components may impair suitability for Class I, Division2.

· Do not replace components or disconnect equipment unless power has been switched off or the area is known to be non-hazardous.

· Do not connect or disconnect components unless power has been switched off or the area is known to be non-hazardous.

· This product must be installed in an enclosure.

· All wiring must comply with N.E.C. article 501-4(b).

3.3.2 Prevent Electrostatic Discharge

Attention

Electrostatic discharge can damage integrated circuits or semiconductors if you touch analog I/O module bus connector pins or the terminal block on the input module. Follow these guidelines when you handle the module: Touch a grounded object to discharge static potential. Wear an approved wrist-strap grounding device. Do not touch the bus connector or connector pins. Do not touch circuit components inside the module. If available, use a static-safe work station. When it is not in use, keep the module in its static-shield bag.

Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that

occasionally a temporary conductivity caused by condensation shall be expected.

Over Voltage Category II is the load level section of the electrical distribution system. At this level transient

voltages are controlled and do not exceed the impulse voltage capability of the product’s insulation.

Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC)

designations.

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3.3.3 Remove Power

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 and may lead to premature failure.

3.3.4 Selecting a Location

Reducing Noise

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 will reduce 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 location for the analog module. Position the module:

• 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 1769-IA16.

Refer to the module’s heat dissipation specification.

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

Power Supply Distance

You can install as many modules as your power supply can support. However, all 1769 I/O modules have a power supply distance rating. The maximum I/O module rati ng is 8, which means that a module may not be located more than 8 modules away from the system power supply.

Figure 3-1

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Section 3.4 System Assembly

The module can be attached to the controller or an adjacent I/O module before or after mounting. For mounting instructions, see Panel Mounting Using the Dimensional Template, or DIN Rail Mounting. To work with a system that is already mounted, see Replacing a Single Module within a System.

The following procedure shows you how to assemble the Compact I/O system.

Figure 3-2

1. Disconnect power.

2. Check that the bus lever of the module to be installed is in the unlocked (fully right)

position.

NOTE: If the module is being installed to the left of an existing module, check that the right-side adjacent module’s bus lever is in the unlocked (fully right) p osition.

3. Use the upper and lower tongue-and-groove slots (1) to secure the modules together

(or to a controller).

4. Move the module back along the tongue-and-groove slots until the bus connectors

(2) line up with each other.

5. Push the bus lever back slightly to clear the positioning tab (3). Use your fingers or a

small screwdriver.

6. To allow communication between the controller and module, move the bus lever

fully to the left (4) until it clicks. Ensure it is locked firmly in place.

Attention

When attaching I/O modules, it is very important that the bus connectors are securely locked together to ensure proper electrical connection.

7. Attach a n end cap terminator (5) to the last module in the system by using the

tongue-and-groove slots as before.

8. Lock the end cap bus terminator (6).

Attention

A 1769-ECR or 1769-ECL right or left end cap respectively must be used to terminate the end of the bus.

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Section 3.5 Mounting

Attention

During panel or DIN rail mounting of all devices, be sure that all debris (metal chips, wire strands, etc.) is kept from falling into the module. Debris that falls into the module could cause damage at power up.

3.5.1 Minimum Spacing

Maintain spacing from enclosure walls, wireways, adjacent equipment, etc. Allow 50 mm (2 in.) of space on all sides for adequate ventilation, as shown below:

Figure 3-3

3.5.2 Panel Mounting

Mount the module to a panel using two screws per module. Use M4 or #8 panhead screws. Mounting screws are required on every module.

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Panel Mounting Using the Dimensional Template

Figure 3-4

Panel Mounting Procedure Using Modules a s a Template

The following procedure allows you to use the assembled modules as a template for drilling holes in the panel. If you have sophisticated panel mounting equipment, you can use the dimensional template provided on the previous page. Due to module mounting hole tolerance, it is important to follow these procedures:

1. On a clean work surface, assemble no more than three modules.

2. Using the assembled modules as a template, carefully mark the center of all module-

mounting holes on the panel.

3. Return the assembled modules to the clean work surface, including any previously

mounted module s.

4. Drill and tap the mounting holes for the recommended M4 or #8 screw.

5. Place the modules back on the panel, and check for proper hole alignment.

6. Attach the modules to the panel using the mounting screws.

NOTE If mounting more modules, mount only the last one of this group and put the others aside. This reduces remounting time during drilling and tapping of the next group.

7. Repeat steps 1 to 6 for any remaining modules.

3.5.3 DIN Rail Mounting

The module can be mounted using the following DIN rails:

• 35 x 7.5 mm (EN 50 022 - 35 x 7.5), or

• 35 x 15 mm (EN 50 022 - 35 x 15).

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Before mounting the module on a DIN rail, close the DIN rail latches. Press the DIN rail mounting area of the module against the DIN rail. The latches will momentarily open and lock into place.

Section 3.6 Replacing a Single Module within a System

The module can be replaced while the system is mounted to a panel (or DIN rail). Follow these steps in order:

1. Re move power. See important note at the beginning of this chapter.

2. On the module to be removed, remove the upper and lower mounting screws from

the module (or open the DIN latches using a flat-blade or phillips- st yle screwdriver).

3. Move the bus lever to the right to disconnect (unlock) the bus.

4. On the right-side adjacent module, move its bus lever to the right (unlock) to

disconnect it from the module to be removed.

5. Gently slide the disconnected module forward. If you feel excessive resistance,

check that the module has been disconnected from the bus, and that both mounting screws have bee n removed (or DIN latches opene d).

NOTE: It may be necessary to rock the module slightly fro m front to back to remove it, or, in a panel-mounted system, to loosen the screws of adjacent modules.

6. Before installing the replacement module, be sure that the bus lever on the module to

be installed and on the right-side adjacent module or end cap are in the unlocked (fully right) position.

7. Slide the replacement module into the open slot.

8. Connect the modules together by locking (fully left) the bus levers on the

replacement module and the right-side adjacent module.

9. Replace the mounting screws (or snap the module onto the DIN rail).

Section 3.7 Field Wiring Connections & System Wiring Guidelines

Consider the following when wiring your system:

General

• Power and input wiring must be in accordance with Class 1, Division 2 wiring

methods, Article 501-4(b) of the National Electric Code, NFPA 70, and in accordance with the authority having jurisdiction.

• Channels are isolated from one another by ±500 Vdc maximum.

• Route field wiring away from any other wiring and as far as possible from sources of

electrical noise, such as motors, transformers, contactors, and ac devices. As a general rule, allow at least 15.2 cm (6 in.) of separation for every 120V of power.

• Routing field wiring in a grounded conduit can reduce electrical noise.

• If field wiring must cross ac or power cables, ensure that they cross at right angles.

• Provision shall be made to prevent the rated voltage being exceeded by the transient

disturbances of more than 40%.

• The system shall be mounted in an ATEX certified enclosure with a minimum

ingress protection rating of at least IP54 as defined in IEC60529 or EN60529 and used in an environment of not more than pollution degree 2.

• Earthing is accomplished through mounting of modules on rail.

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• Subject devices are for operation in Ambient Temperature Range: 0 C to +60 C

Terminal Block

• For voltage and current sensors, use Belden 8761 shielded, twisted-pair wire (or

equivalent) to ensure proper operation and high immunity to electrical noise.

• To ensure optimum accuracy, limit overall cable impedance by keeping a cable as

short as possible. Locate the module as close to input devices as the application permits.

Grounding

• This product is intended to be mounted to a well-grounded mounting surface such as

a metal panel. Additional grounding connections from the module’s mo untin g tabs or DIN rail (if used) are not required unless the mounting surface cannot be grounded.

• Keep cable shield connections to ground as short as possible.

• Ground the shield drain wire at one end only. The typical location is as follows.

• If it is necessary to connect the shield drain wire at the module end, connect it to

earth ground using a panel or DIN rail mounting screw.

• Refer to Industrial Automation Wiring and Grounding Guidelines, Allen-Bradley

publication 1770-4.1, for additional information.

Noise Prevention

• To limit the pickup of electrical noise, keep analog signal wires as far as possible

from power and load lines.

• If noise persists for a device, try grounding the opposite end of the cable shield. (You

can only ground one end at a time.)

3.7.2 Terminal Door Label

A removable, write-on label is provided with the module. Remove the label from the door, mark your unique identification of each terminal with permanent ink, and slide the label back into the door. Your markings (ID tag) will be visible when the module door is closed.

3.7.3 Removing and Replacing the Terminal Block

When wiring the module, you do not ha ve to remove the terminal block. If you remove the terminal block, use the write-on label located on the side of the terminal block to identify the module location and type.

Figure 3-5

To remove the terminal block, loosen the upper and lower retaining screws. The terminal block will back away from the module as you remove the screws. When replacing the terminal block, torque the retaining screws to 0.46 Nm (4.1 in-lbs).

3.7.4 Wiring the Finger-Safe Terminal Block

When wiring the terminal block, keep the finger-safe cover in place.

1. Loosen the terminal screws to be wired.

2. Route the wire under the terminal pressure plate. You can use the bare wire or a

spade lug. The terminals accept a 6.35 mm (0.25 in.) spade lug.

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NOTE: The terminal screws are non-captive. Therefore, it is possible to use a ring lug [maximum 1/4 inch o.d. with a 0.139 inch minimum i.d. (M3.5)] with the module.

3. Tighten the terminal screw making sure the pressure plate secures the wire.

Recommended torque when tightening terminal screws is 0.68 Nm (6 in-lbs).

NOTE: If you need to remove the finger-safe cover, insert a screwdriver into one of the square, wiring holes and gently pry the cover off. If you wire the term inal block with the finger-safe cover removed, you may not be able to put it back on the terminal block because the wires will be in the way.

Wire Size and Terminal Screw Torque

Each terminal accepts up to two wires with the following restrictions:

Wire Type Wire Size Terminal Screw

Torque

Retaining Screw Torque

Solid Cu-90°C (194°F)

#14 to #22 AWG (1.63 to 0.65 mm)

0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)

Stranded Cu-90°C (194°F)

#16 to #22 AWG (1.63 to 0.65 mm)

0.68 Nm (6 in-lbs) 0.46 Nm (4.1 in-lbs)

Attention

Use supply wires suitable for 20°C above surrounding a mbient.

3.7.5 Wiring the Module

Attention

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

After the module is properly installed, follow the wiring procedure below, using the proper cable, Belden 8761.

Figure 3-6

To wire your module follow t hese steps.

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

2. Trim the signal wires to 2-inch (5 cm) lengths. Strip about 3/16 inch (5 mm) of

insulation away to expose the end of the wire.

Attention

Be careful when stripping wires. Wire fragments that fall into a module could cause damage at power up.

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

from the cable, and apply shrink wrap. Then earth ground at the preferred location based on the type of sensor you are using. See Grounding for more details.

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

apply shrink wrap.

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5. Connect the signal wires to the terminal block. Connect the other end of the cable to

the analog input device.

6. Repeat steps 1 through 5 for each channel on the module.

3.7.6 Wiring Diagram

Figure 3-7

N/C

Ch1-iRtn

N/C

Ch3-iRtn

Ch0+

N/C

Ch0-iRtn Ch0-

Ch1+

N/C

Ch2-iRtn Ch2-

Ch3+

Ch3-

N/C N/C

Ch2+

Ch1-

+ -

2 Wire XMTR

24V DC Power Supply

2 Wire Current Input

4 Wire Current Input

4 Wire XMTR

24V DC Power Supply

- V

Voltage Input

3.7.7 Calibration

The isolated HART module is initially calibrated at the factory.

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Chapter 4 Configuring the IF4IH for CompactLogix Using RSLogix 5000

This chapter explains how to incorporate the IF4IH module into a CompactLo gix syste m using RSLogix 5000 programming soft ware. The process of incorporating your HART module into the CompactLogix system is similar to the process needed to add an AllenBradley module. You will use your RSLogix 5000 programming software to install and configure your HART module.

An Add-On profile is available on our website to ease the installation of the module, if you choose not to use the generic module profile. The Add-On profile download also includes an RSLogix 5000 sample project demonstrating how to read and write H ART data to and from each channel. The sample project contains user defined data types, configuration tags, input tags, output tags, and ladder samples needed to configure each HART module. The topics discussed in this chapter include:

• Setting up the generic profile

• Using the Add-On profile

• Understanding user defined data types

• Adding the controller and program tags

• Using the provided ladder sample

Section 4.1 Setting up the Generic Profile

The generic profile defines the module for the CompactBus, so that the right number of input, output and configuration words are reserved. To co nfigure the generic profi le you can use the profile already created in the sample project, see Figure 4-1, or follow the procedures outlined below.

Figure 4-1 (Pre-Defined Generic Profile)

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1. Create a new RSLogix 5000 project file. Click on the new project icon or on the FILE pull-down menu and select NEW. The following screen appears:

Figure 4-2

2. Choose your controller type and enter a name for your project, then click OK. The following main RSLogix 5000 screen appears:

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Figure 4-3

3. In the ControllerOrganizer on the left of the screen, right click on “[0]CompactBus Local”, select New Module, and the following screen appears:

Figure 4-4

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4. This screen is used to narrow your search for I/O modules to configure into your system. With the initial release of the CompactLogix5320 controller, this screen only includes the “Generic 1769 Module”. Click the OK button and the following default Generic Profile screen appears:

Figure 4-5

5. First, select the Comm Format (“Data – INT” for the 1769sc-IF4IH), then fill in the name field. For this example, “IF4IH” is used to help identify the module type in the Controller Organizer. The Description field is optional and may be used to provide more details concerning this I/O module in your application.

The slot number must be selected next, although it will begin with the first available slot number, 1, and increments automatically for each subsequent Generic Profile you configure. For this example, the 1769sc-IF4IH HART module is located in slot 1.

The Comm Format, Assembly Instance and Size values are listed in the following table for the 1769sc-IF4IH HART module:

Table 4-1 (Generic Profile Parameters)

1769 I/O

Module

Comm

Format

Parameter

Assembly

Instance

Size

(16-Bit)

IF4IH Data-INT Input

Output Config

101 100 102

72 46 34

6. Enter the Assembly Instance numbers and their associated sizes for the 1769scIF4IH module into the Generic Profile. When complete, the Generic Profile for a 1769sc-IF4IH module should look like the following:

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Figure 4-6

7. At this point you may click “Finish” to complete the configuration of your I/O module.

Configure each I/O module in this manner. The CompactLogix5320 controller supports a maximum of 8 I/O modules. The valid slot numbers to select when configuring I/O modules are 1 through 8.

Section 4.2 Using The Add-On Profile

For RSLogix 5000 version 15 and greater an Add-On module profile is available for download at (http://www.spectrumcontrols.com/downloads.htm

). The Add-On profile allows the user to add the IF4IH module to the RSLogix 5000 module pick list. The profile provides configuration and information screens to the user, to simplify installation. Follow the procedure below to install and use the Add-On pro file.

Attention

Module firmware 2.0 and greater is required in order to use the Add-On profile.

4.2.1 Installing the Add-On profile

1. Download the zipped file from the Spectrum Controls website and unzip the file.

http://www.spectrumcontrols.com/pdfs/abio/SC 1769sc-IF4IH DTM 1.0.0.3 Setup.zip

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2. Open the created folder and double-click on the MPSetup.exe file.

3. Follow the online prompts.

4.2.2 Adding the IF4IH Module To Your Logix Project

Once the profiles are installed you can access them through RSLogix 5000 via the I/O Configuration. Follow the procedure below to add a module:

1. In the I/O Configuration, right mouse click on the 1769 CompactBus and select “New Module”.

2. When the dialog screen opens, select the “By Vender” tab and expand the Spectrum Controls folder.

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3. Highlight the module and press the “OK” button.

4. Configure the module using the custom configuration screens.

Note: The 1769sc-IF4IH still requires ladder to demultiplex the HART data and send HART messages via the controller. Please refer to the sample project packaged with the profile install for more information.

Section 4.3 User Defined Data Types

The sample project contains user defined data types which define the structure for tags used within the project. The data types organize the HART data returned by the module and are referenced throughout this manual, so it is highly recommended that these data types be used whenever possible.

Select the data type you wish to copy from the Controller Organizer and past it into your project under user defined data types. See figure below.

Figure 4-7 (Copying Data Types)

Attention

The user defined data types should be copied before copying the tags or ladder.

Drag and

drop one at a

time

Sample

Project

Your

Project

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The table below gives a brief description of each data type.

Table 4-2 (User Defined Data Type Descriptions)

User Defined Data Type Description

GetDeviceInfoStructure Defines the structure of the HART data returned by the

module when the module specific command, Get Device Information, is sent to module.

If4ihMessage This data type defines the structure for tags used to

send messages to and from the module using the paging scheme.

If4ihPassThruMsg Defines the structure for tags used to send HART pass

through messages to and from the module.

Packet0 Defines the data structure for HART packet 0. HART

packet zero contains device information for the connected HART device.

Packet1 Defines the data structure for HART packet 1. HART

packet 1 is used to display the four dynamic variables for the selected HART device.

Packet2 Defines the data structure for HART packet 2. HART

packet 2 is used to display the slot variables for the connected HART device.

Packet3 Defines the data structure for HART packet 3. HART

packet 3 displays the ASCII message for the connected HART device.

Packet4 Defines the data structure for HART packet 4. HART

packet 4 contains the extended status for the connected HART device.

Section 4.4 Project Tags

The project tags were created to simplify the configuration of the module. Some of the tags defined in the sample project utilize the user defined data types described in the previous section.

The user defined tags from the controller scope should be copied to your project before the tags contained in the individual program sections. Open the controller tags on the sample project and select the edit tags mode. Grab the t ags you want to copy by using the left mouse button and dragging. See figure below.

Refer to Chapter 6 for more details.

Refer to Chapter 7 for more details.

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Figure 4-8 (Copying Controller Tags)

After copying the controller tags you can copy the program tags next. Follow the same procedure shown in Figure 4-8.

Section 4.5 Sample Project Ladder

The ladder contained in the sample project is used to perform se veral different operations. The main routine in the MainProgram is used to jump to the routines that copy the multiplexed HART data from the module.

The If4ih0_Packet_Data routine in the MainProgram contains the ladder that demultiplexes the HART data for each individual packet. Refer to Chapter 7 for more information on HART and the HART packets.

The If4ih0Messaging program contains several routines needed to send and receive HART messages to and from the module and the connected HART devices.

To copy any of the ladder, programs or routines, follow the procedure below:

1. Select the program or routine.

2. Right mouse click and select copy.

3. Go to your project and select the appropriate program or task to place the new routine or program.

4. Right mouse click and select paste.

Sample Project

Your

Project

Copy and

paste tags

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The figure below outlines this procedure:

Figure 4-9 (Copying Routines or Programs)

You can follow a similar procedure for copying ladder as well.

1. Open the routine that contains the ladder you want to copy.

2. Select the rungs to copy.

3. Right mouse click and select copy.

4. Open the routine in your project where you wish to paste the new rungs.

5. Right mouse click and select paste.

The figure below demonstrates this procedure:

Sample Project

Your

Project

Copy

and

aste

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Figure 4-10 (Copying Ladder)

Sample Project

Your

Project

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Chapter 5 Configuring the IF4IH for a MicroLogix 1500 Using RSLogix 500

This chapter examines the 1769sc-IF4IH module’s addressing scheme and describes module configuration using RSLogix 500 and a MicroLogix 1500 controller. This chapter will cover the following:

• Module Addressing

• Configuring the IF4IH in a MicroLogix 1500 System

• Using the Ladder Sample

Section 5.1 Module Addressing

The following memory map shows the input, output, and configuration image tables for the module. Detailed information on the image table is located in Chapter 6.

Figure 5-1 (Module Memory Map)

slot e

Input Image File

Input Image

72 Words

Memory Map

Word 0: Channel 0 Data Word Word 1: Channel 1 Data Word Word 2: Channel 2 Data Word Word 3: Channel 3 Data Word Word 4: Time Stamp Value Word 5: General Channel Status Word 6: Process & Range Alarms Word 7: Pad Words 8..27: HART Packet Data Word 28: ScanMSG Slave Control Word 29: ScanMSG Response Size Words 30..49: ScanMSG Response Buffer

Bit 15

Bit 1

slot e

Configuration File

Configuration

34 Words

Words 2..7: Channel 0 Configuration Words 8..13: Channel 1 Configuration Words 14..19: Channel 2 Configuration Words 20..25: Channel 3 Configuration

Bit 15

Bit 1

Word 1: Module Configuration

Word 0: Real Time Sample

slot e

Output File

Output

46 Words

Word 2: ScanMSG Master Control Word 3: ScanMSG Request Size Word 4..23: ScanMSG Request Buffer

Bit 15

Bit 1

Word 1: Last Packet Scanned

Word 0: Unlatch Alarms/HART Suspend

Word 26: Ch0 Slot Variables 0 & 1 Word 27: Ch0 Slot Variables 2 & 3 Word 28: Ch1 Slot Variables 0 & 1 Word 29: Ch1 Slot Variables 2 & 3 Word 30: Ch2 Slot Variables 0 & 1 Word 31: Ch2 Slot Variables 2 & 3 Word 32: Ch3 Slot Variables 0 & 1 Word 33: Ch3 Slot Variables 2 & 3

Words 50..71: Reserved

Word 24..45: Reserved

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For example, to obtain the general status for channel 2 of the module located in slot e, use address I:e.5/2.

Figure 5-2 (Address Example)

Slot

Word

Bit

Input File Type

Element Delimiter

Word

Delimiter

Bit

Delimiter

I:e.5/2

NOTE: The end cap does not use a slot address.

Section 5.2 Configuring the 1769sc-IF4IH in a MicroLogix 1500 System

This example takes you through configuring your 1769scIF4IH isolated HART analog input module with RSLogix 500 programming so ftware, assumes your module i s installed as expansion I/O in a MicroLogix 1500 system, and that RSLinx™ is properly configured and a communications link has been established between the MicroLogix processor and RSLogix 500.

Attention

It is recommended that a 1764-LRP series C processor with firm ware version 5 or higher be used. The LRP processor supports floating point files, which is required to read floating point data from the IF4IH.

Start RSLogix and create a MicroLogix 1500 application. The following screen appears:

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Figure 5-3

While offline, double-click on the IO Configuration icon under the controller folder and the following IO Configuration screen appears.

Figure 5-4

This screen allows you to manually enter expansion modules into expansion slots, or to automatically read the configuration of the controller. To read the existing controller configuration, click on the Read IO Config button.

A communications dialog appears, identifying the current communications confi g uration so that you can verify the target controller. If the communication settings are correct, click on Read IO Config.

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Figure 5-5

The actual I/O configuration is displayed. In this example, a second tier of I/O is attached to the MicroLogix 1500 processor.

Figure 5-6

The 1769sc-IF4IH module is installed in slot 1. To configure the module, double-click on the module/slot. The general configuration screen appears.

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Figure 5-7

Attention

When using the read IO configuration feature in RS Lo gix, you need to manually enter 34 into the “extra data length” field.

To configure the module select the Generic Extra Data Configuration tab. Enter the decimal equivalent of each configuration word. There are a total of thirty four words that need to be configured altogether. The module default settings are used if all the configuration words are left at zero.

Figure 5-8

NOTE: For a complete description of each of these parameters and the choices available for each of them, refer to Chapter 6.

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Section 5.3 Using the Ladder Sample

To get started we recommend that you use the provided MicroLogix 1500 sample project. Refer to Chapter 8 for the sample project or visit our website at (www.spectrumcontrols.com

The sample project contains nine different subroutines which are used to perform various HART related tasks. The following list describes the function of each subroutine within the project file.

Table 5-1 (Ladder Routines)

Routine Description

MAIN

The main routine is the starting point for the ladder program.

PACKETS

The “packets” routine is used to demultiplex the HART data from the input file to individual integer files, so that the data can be viewed or used within the ladder program. This routine is called from the MAIN routine.

MSG_TO_MOD

This routine is used to send and receive messages to and from the module. Refer to Chapter 7 for more details regarding sending and receiving messages. This routine is called from the HART_MSG routine.

SRC_CHECK

Calculates the checksum for a message sent to the module one page at a time. This routine is called from the MSG_TO_MOD routine.

DEST_CHECKSUM

This routine calculates the checksum for a message received from the module one page at a time. This routine is called from the MSG_TO_MOD routine.

HART_MSG

This routine composes HART messages that will be sent to the module/field transmitter. This routine is called from the MAIN routine.

WORD_BYTE

Converts word data to its byte equivalent. This routine is called from the HART_MSG routine.

HART_CHECK

Calculates the checksum for the HART message being sent to the module/field device. This routine is called from the HART_MSG routine.

BYTE_WORD

Converts byte data to its word equivalent. This routine is called by the HART_MSG routine.

You have the choice to either use the sample project or copy and past the pieces you need from the project.

5.3.1 Copying Subroutines from the Sample Project

To copy subroutines from the sample project to your project, fo llow the steps below:

1. Open the sample project and your project.

2. Select the subroutine you wish to co py.

3. Right mouse click and select copy.

4. Go to your project and select where you would like to place the new routine.

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5. Right mouse click and select paste.

Figure 5-9 (Copying Routines)

5.3.2 Copying Ladder from the Sample Project

To copy ladder, follow the procedure below:

1. Open the sample project and your project

2. Open the routine that you wish to copy the ladder from.

3. Select the rungs by clicking the left mouse button. To select more rungs, select the first rung you wish to copy and while holding the shift key, select the last rung you wish to copy.

4. Right mouse click and select copy.

5. Open the routine in your project where you wish to place the new rungs.

6. Select the paste point by left mouse clicking.

7. Right mouse click and select paste.

Copy

and

aste

Sample Pro

ject

Your

Pro

ject

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Figure 5-10 (Copying Ladder)

5.3.3 Importing Tag Database and Rung Comments

After copying the subroutines and or the ladder, you may wish to import the tags and rung comments. Follow the procedure below to import the tag database and rung comments:

1. Open the sample project and your project.

2. In the sample project, go to the tools menu, select database, and then select ASCII export. See image below:

Copy

and

aste

Sample Pro

ect

Your

Pro

ect

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3. After selecting ASCII export the following screen appears:

4. Select the RSLogix 500 tab and press the OK button.

5. Select the location for the export file.

6. In your project, go to the tools menu, select database, and select ASCII import. See image below:

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7. After selecting ASCII import the following screen should appear:

8. Select the RSLogix 500 radio button and leave everything else at default. After making your selections, press the OK button.

9. Select the export file from steps 4 and 5 and press the open button. You may be prompted for multiple files depending on the selections you made in step 8.

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Chapter 6 Module Data, Status, and Channel Configuration

After installing the 1769sc-IF4IH isolated HART input module, you must configure it for operation, usually using the programming software compatible with the controller (for example, RSLogix 500 or RSLogix 5000). Once confi guration is complete and reflected in the ladder logic, you need to operate the module and verify its config uration.

This chapter contains information on the following:

• Modu l e memory ma p

• Accessing input image file data ·

• Configuring channels

• Determining effective resolution and range

• Determining module update time

Section 6.1 Module Memory Map

The module uses fifty input words for data and status bits (input image), twenty four output words, and thirty four configuration word s.

Figure 6-1 (Module Memory Map)

NOTE: Not all controllers support program access to the configuration file. Refer to your controller’s user manual.

slot e

Input Image File

Input Image

72 Words

Memory Map

Word 0: Channel 0 Data Word Word 1: Channel 1 Data Word Word 2: Channel 2 Data Word Word 3: Channel 3 Data Word Word 4: Time Stamp Value Word 5: General Ch annel Status Word 6: Process & R ange Alarms Word 7: Pad Words 8..27: HART Packet Data Word 28: ScanMSG Slave Contro l Word 29: ScanMSG Response Size Words 30..49: ScanM SG Response Buffer

Bit 15

Bit 1

slot e

Configuration File

Configuration

34 Words

Words 2..7: Channel 0 Configura tion Words 8..13: Channel 1 Configuration Words 14..19: Channel 2 Configur ation Words 20..25: Channel 3 Configur ation

Bit 15

Bit 1

Word 1: Module Configuration

Word 0: Real Time Sample

slot e

Output File

Output

46 Words

Word 2: ScanMSG Master Control Word 3: ScanMSG Request Size Word 4..23: ScanMSG Request Buffer

Bit 15

Bit 1

Word 1: Last Packet Scanned

Word 0: U nlatch Alarms/HART Suspend

Words 50..71: Reserved

Word 24..45: Reserved

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Section 6.2 Accessing Input Image File Data

The input image file represents data words and status words. Input words 0 through 3 hold the input data that represents the value of the analog inputs for channels 0 through 3. These data words are valid only when the channel is enabled and there are no errors. Input word 4 contains the time stamp value. Words 5 and 6 contain status information for the four channels including process alarms and over and under range flags. Word 7 contains the HART channel identification and status information. Words 8 through 27 include the HART packet data. Refer to Chapter 7 for information on how to demultiplex the HART packet data. Input word 28 holds the message control. Word 29 holds the message response size. Words 30 through 49 hold the message response buffer. Refer to Chapter 7 for more information regarding input words 28 through 49.

You can access the information in the input image file using the programming software configuration screen. For information on configuring the module in a MicroLogix 1500 system using RSLogix 500, see Chapter 5; and for the CompactLogix using RSLogix 5000, see Chapter 4.

Section 6.3 Input Data File

The input data file allows you to access module input data for use in the control program, via word and bit access. The data table structure is shown in the table below.

Table 6-1 (Module Input Imag e )

Word/Bit¹15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

0 1 2 3 4 5 OS3 OS2 OS1 OS0 S3 S2 S1 S0 6 L3H3U3O3L2H2U2O2L1H1U1O1L0H0U0O0 7

8..27 28 29

30..49

50..71

(1) Ch anging bit values is not supported by all controllers . Refe r to your controller manual for details.

Reserved

Time S tamp Value

Messag e Re sponse Size

Not Used

Pad (1 6 bi t a lignment)

Message Re sponse Buffer

Analog Input Data Cha nnel 0 Analog Input Data Cha nnel 1 Analog Input Data Cha nnel 2

nalog Input Data Channel 3

HART Pa cket Data

Messa

e Slave Control

6.3.1 Input Data Values (Words 0 to 3)

Data words 0 through 3 correspond to channels 0 through 3 and contain the converted analog input data from the input device. The most significant bit, bit 15, is the sign bit (SGN).

6.3.2 Time Stamp Value (Word 4)

The time stamp value represents the instant in time that the current input data was read. The time stamp value is measured in milliseconds from 0 to 32767. When the value reaches 32767, the timer will roll over to 0 and then the process will repeat.

6.3.3 General Status Bits S0 to S3 (Word 5)

Bits S0 through S3 of word 5 contain the general status information for channels 0 through 3, respectively. If set (1), this bit indicates an error (over- or under-range, low or high alarm, or channel data not valid). The data not valid condition is described below.

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Input Data Not Valid Condition

The general status bits S0 to S3 also indicate whether or not the input data for a particular channel, 0 through 3, is being properly converted (valid) by the module. This “invalid data” condition can occur (bit set) when the download of a new configuration to a channel is accepted by the module (proper configuration) but before the A/D converter can provide valid (properly configured) data to the 1769 bus master/controller. The following information highlights the bit operation of the Data Not Valid condition.

1. The default and module power-up bit condition is reset (0).

2. The bit condition is set (1) when a new configuration is received and determined valid by the module. The set (1) bit condition remains until the module begins converting analog data for the previously accepted new configuration. When conversion begins, the bit condition is reset (0). The amount of time it takes for the module to begin the conversion process depends on the number of channels being configured and the amount of configuration data downloaded by the controller.

NOTE: If the new configuration is invalid, the bit functio n remains reset (0) and the module posts a configuration error. See Configuration Errors on page 9-4.

3. If A/D hardware errors prevent the conversion process from taking place, the bit condition is set (1).

6.3.4 Out of Service Status Bits OS0 to OS3 (Word 5)

Bits SO0 through SO3 of word 0 indicate whether the associated channel is out of service (i.e. automatic HART acquisition is suspended).

Note: A channel that is placed out-of-service (i.e. Suspended) will automatically resume service after three minutes, as long a s no pass-through commands are issued before the three minutes expires.

6.3.5 Over-Range Flag Bits O0 to O3 (Word 6)

Over-range bits for channels 0 through 3 are contained i n word 6, even-numbered bits. They apply to all input types. When set (1), the over-range flag bit indicates an input signal that is at the maximum of its normal operating range for the represented channel or sensor. The module automatically resets (0) the bit when the data value falls below the maximum for that range.

Note: If a channel is configured for a voltage type input and an open-circuit co ndition is present, the over-range flag bit will be set to indicate the open circuit condition and the associated channel data word will disp lay the full-scale value.

6.3.6 Under-Range Flag Bits U0 to U3 (Word 6)

Under-range bits for channels 0 through 3 are contained in word 6, odd-numbered bits. They apply to all input types. When set (1), the under-range flag bit indicates an input signal that is at the minimum of its normal operating range for the represented channel or sensor. The module automatically resets (0) the bit when the under-range condition is cleared and the data value is within the normal operating range.

Note: If a channel is configured for a current type input and an open-circuit condition is present, the under-range flag bit will be set to indicate the o pen circuit condition and the associated channel data word will display the minimum scale value.

6.3.7 High Process Alarm Flag Bits H0 to H3 (Word 6)

The high process alarm flag is set when the measured analog signal exceeds the high process alarm setpoint. The high process alarm setpoint is defined in Section 6.4 Module Configuration.

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6.3.8 Low Process Alarm Flag Bits L0 to L3 (Word 6)

The low process alarm flag is set when the measured analog signal falls below the low process alarm setpoint. The low process alarm setpoint is defined in Section 6.4 Module Configuration.

6.3.9 Pad (Word 7)

Word 7 is not used and will always be zero. This word is used to maintain 16 bit alignment.

6.3.10 HART Data (Words 8 to 27)

This block of twenty words contains the multiplexed HART data for all four channels.

6.3.11 Message Slave Control (Word 28)

The message slave control word controls how data is returned from the mo dule after sending a mess age using output words 2 through 23

6.3.12 Message Reply Size (Word 29)

The message reply size indicates the number of bytes returned by the module after sending a mess age using output words 2 through 23

6.3.13 Message Reply Buffer (Words 30…49)

After sending a message to the module, the response data for the messa ge is stored in the

message reply buffer

6.3.14 Reserved (Words 50…71)

Reserved for future expansion.

For more details refer to Chapter 7

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Section 6.4 Module Configuration

After module installation, you must configure operation details, such as input type, data format, etc., for each channel. Configuration data for the module is stored in t he controller configuration file, which is both readable and writable.

The default value of the configuration data is represented by zeros in the data file. The structure of the channel configuration file is shown below.

Table 6-2a (Module Configuration)

15 14 13 12 11 10 9 8 7 6 5 4

210

Real Time Sample

ETS 0 EH3EH2EH1EH0

Ge ner a l Co nf igu r at io n

Bits

EC EA AL EI

Ch0 Filter Frequency and

Gener al Settings

Ch0 Data forma t and

inp ut type

Ch 0 Process Alarm High

Value

Ch0 Process Al arm Low

Value

Ch0 Alarm Deadband

Data Padding

EC EA AL EI

Ch1 Filter Frequency and

Gener al Settings

Ch1 Data forma t and

inp ut type

Ch 1 Process Alarm High

Value

Ch1 Process Al arm Low

Value

Ch1 Alarm Deadband

Data Padding

EC EA AL EI

Ch2 Filter Frequency and

Gener al Settings

Ch2 Data forma t and

inp ut type

Ch 2 Process Alarm High

Value

Ch2 Process Al arm Low

Value

Ch2 Alarm Deadband

Data Padding

EC EA AL EI

Ch3 Filter Frequency and

Gener al Settings

Ch3 Data forma t and

inp ut type

Ch 3 Process Alarm High

Value

Ch3 Process Al arm Low

Value

Ch3 Alarm Deadband

Data Padding

Function

Real Ti me Sample Value

Reserved Slot Variable ( 0-3) Input Filter Ch3

Reserved

Ch3 Data

Reser v ed Ch3 Inpu t Type

Reserved Slot Variable (0-3) Input Filter Ch 0

Handle Timeout

Word

Bit

Ch1 Input Type

Pad

Channel 0 High Pr ocess Alarm Setpoint Channel 0 Low Process Alarm Setpoint

Channel 0 Alarm Deadband

Reserved

Ch0 Data

Reser v ed Ch0 Inpu t Type

Pad

Channel 1 High Pr ocess Alarm Setpoint Channel 1 Lo w Proc ess Alarm Setpoint

Channel 1 Alarm Deadband

Reserved Slot Variable (0-3) Input Filter Ch 1

Reserved

Ch1 Data

Reserve d

Channel 2 High Pr ocess Alarm Setpoint Channel 2 Lo w Proc ess Alarm Setpoint

Channel 2 Alarm Deadband

Reserved Slot Variable (0-3) Input Filter Ch 2

Reserved

Ch2 Data

Reser v ed Ch2 Inpu t Type

Pad

Channel 3 High Pr ocess Alarm Setpoint Channel 3 Lo w Proc ess Alarm Setpoint

Channel 3 Alarm Deadband

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Table 6-2b (Module Configuration)

1514 13 12 11 10 9 8 7 6

43210

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Defines Slot

Variables

Channel 3 HART Slot Variables 2 & 3

Channel 1 HART Slot Variables 2 & 3 Channel 2 HART Slot Variables 0 & 1

Channel 2 HART Slot Variables 2 & 3

Channel 3 HART Slot Variables 0 & 1

Word

Bit

Function

Channel 0 HART Slot Variables 2 & 3

Channel 0 HART Slot Variables 0 & 1

Channel 1 HART Slot Variables 0 & 1

6.4.1 Real Time Sample Value (Word 0)

The real time sample value determines when the module will scan its input channels for available data. After the channels are scanned, the data is made available to the PLC. The valid range for the real time sample is 0

to 5000 ms (i.e. Enter a value of 0 to 5000).

Note: The Real Time Sample rate must be greater than or equal to the slowest channel step response time. See Table 6-5 to determine the proper RTS rate.

Note: The configuration file can also be modified throug h the control program, if supported by the controller. For information on configuring the module using RSLogix 500 (with MicroLogix 1500 controller), see Chapter 5; for RSLogix 5000 (CompactLogix controller), see Chapter 4.

6.4.2 General Configuration Bits (Word 1)

Word 1 is used to configure general module properties like enabling and disabling HART, setting a HART handle time for HART messaging, and selecting one of three scanning schemes for HART pass-through messages. The table below shows the available settings for word 1.

Table 6-3 (General Configuration Bits)

1514 13121110987654

210

Disable

Enabl ed

Disable

Enabl ed

Disable

Enabl ed

Disable

Enabl ed

Pass-Through Scheme

Two Ch an nel Sc an s 0 0

Once P er Module Scan

Every Ch annel Scan 1 0

Reserved

Set to Zero 0

ETS

Disabled

Enabled

Make the se bit setti n gs

Han dle Timeo ut (1 to 255 sec)

CH0 HART Enable

CH1 HART Enable

CH2 HART Enable

CH3 HART Enable

To Select

Handle Timeout

When RTS is set to zero, all channels are acquired freely and independently with no idle time. A channel configured at a high filter frequency can be acquired multiple times in the time that a single acquisition is made for a channel configured at a lower filter frequency.

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NOTE Default settings for a particular function are indicated by zero(s). For example, the default filter frequency is 60Hz. Publication

Handle Timeout

There is a handle timeout associated with the final reply message. After the module obtains the requested information from the HART device, it will start the Handle Timeout timer. The reply message will be kept in memory during the Handle Timeout period. After the timeout occurs or after the message is retrieved by the pass -through response query command, the storage buffer will be discarded, and another pass through message will be serviced without being rejected. Handle Timeout is in the range of 0 to 255 seconds.

Note: A handle timeout of zero is valid. When set to zero t he handle timeout will default to 10 seconds.

Channel HART Enable (Bits 8, 9, 10, 11)

These bits allow the user to enable HART on channels 0 through 3, respectively.

Pass-Through Scheme

The pass-thro ugh scheme determines how ofte n a pass through command is serviced.

• Two Channel Scans: Pass-through serviced once every two channel scans

• Once Per Module Scan: Pass-through serviced once per module scan

• Every Channel Scan: Pass-through serviced once every channel scan

Note: The pass-through scheme can increase the HART packet update time if passthrough messages are serviced every channel scan. Refer to Chapter 7 for more details.

ETS (Enable Time Stamp)

Allows module time stamping function to be enabled. See section 6.3.2 for more details.

6.4.3 Filter Frequency and General Settings (Words 2, 8, 14, 20)

This section of the configuration allows the user to configure filter frequencies, enable or disable the associated channel, etc.

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Table 6-4 (Filter Frequency and General Settings)

15 14 13121110987654321

60 H z 0

000

50 Hz 0

28.5 Hz 0

010

300 Hz 0

11 360 Hz 0100 Disable 0

Enable 1

Disable 0

Enable 1

Disable 0

Enable 1

Disable 0

Enable 1

Disable 0

Enable 1

Disable 0

Enable 1

Disable

Enable 1

Reserved

Set To Zero 0000

Disable 0

Enable 1

EI (Enable Interrupt)

AL (Alarm La tch)

EA (Enable Al arm)

To Select

Make these bit setti n gs

EC (Enable Channel)

Slot Code 0

Slot Code 1

Slot Code 2

Slot Code 3

Filter Frequenc y

Input Filter Selection (Bits 0 through 3)

Each channel can be configured for five different filter settings. Select one of the five filters, for the associated channel.

Effects of Filter Frequency on Noise Rejection

The filter frequency that you choose for a module channel determines the amount of noise rejection for the inputs. A lower frequency (50 Hz versus 300 Hz) provides better noise rejection and increases effective resolution, but also increases channel update time. A higher filter frequency provides lower noise rejection, but decreases the channel update time and effective resolution.

When selecting a filter frequency, be sure to consider cut-off frequency and channel step response to obtain acceptable noise rejection. Choose a filter frequency so that your fastest-changing signal is below that of the filter’s cut-off frequency.

Common Mode Rejection is better than 60 dB at 50 and 60 Hz, with the 50 and 60 Hz filters selected, respectively, or with the 28.5Hz filter selected. The module performs well in the presence of common mode noise as long as the signals applied to the user positive and negative input terminals do not exceed the common mode voltage rating (±500V) of the module. Improper earth ground may be a source of common mode noise.

NOTE: Transducer power supply noise, transducer circuit noise, or process variable irregularities may also be sources of normal mode noise.

Effects of Filter Frequency on Channel Step Respon se

The selected channel filter frequency determines the channel’s step response. The step response is the time required for the analog input signal to reach 100% of its expected final value, given a full-scale step change in the input signal. This means that if an input signal changes faster than the channel step response, a portion of that signal will be attenuated by the channel filter. The channel step response is calculated by a settling time of 3 x (1/filter frequency).

Attention

The Real Time Sample rate must be greater than or equal to the slowest channel step response time or a configuration error will occur.

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Table 6-5 (Filter Frequency and Step Response)

Fil te r Frequency

Step Response

28 .5 Hz 10 8 ms

50 Hz 62 ms 60 Hz

52 ms

300 Hz

12 ms

360 Hz

10 ms

The c hann el update time is equ al to the channel step respose.

Channel Cut-Off Frequency

The filter cut-off frequency, -3 dB, is the point on the frequency response curve where frequency components of the input signal are passed with 3 dB of attenuation. The following table shows cut-off frequencies for the supported filters.

Table 6-6 (Filter Frequency versus Channel Cut-off Frequency)

Filte r FrequencyCut -off FrequencyRejection

28 .5 Hz

2. 3 H z 67 db @ 50/60 H z 50 Hz 4.0 Hz 96 db @ 50 Hz 60 Hz 4.7 Hz 96 db @ 60 Hz

300 Hz

24 Hz

25 db @ 50 Hz

360 Hz 28 Hz 25 db @ 60 Hz

All input frequency components at or below the cut-off fr equency are passed by the digital filter with less than 3 dB of attenuation. All frequency components above the cutoff frequency are increasingly attenuated as shown i n Figure 6-2 (Frequency Response).

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Figure 6-2 (Frequency Response)

The cut-off frequency for each 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 the update time. The cutoff frequency relates to 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.

28.5Hz Filter

-120

-100

-80

-60

-40

-20

0102030405060708090

Filter Rejection (dB)

50 Hz Filter

-120

-100

-80

-60

-40

-20

0 20 40 60 80 100 120 140 160

Filter Rejection (dB)

60Hz Filter Oper ation

-120

-100

-80

-60

-40

-20

0 50 100 150 200

Filter Rejection (dB)

300Hz Filter Ope ration

-120

-100

-80

-60

-40

-20

0 200 400 600 800 1000

Filter Re jection (dB)

360Hz Filter Ope ration

-120

-100

-80

-60

-40

-20

0 200 400 600 800 1000 1200

Filter Rejection (dB)

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Slot Variable Enable (Bits 4 through 7)

Slot variable enable bits 4 through 7 can be used to enable HART slot variables 0 through 3, respectively, for the connected HART device. The variable code which is used to define each slot variable for each associated channel is entered into configuration words 26 through 33. Refer to section 6.4 .9 for more information regarding configuri ng slot variables.

Note: Slot variables are not supported by all HART devices. Note: Slot codes must be enabled in sequential order. For example, SV0 (Enabled),

SV1 (Disabled), and SV2 (Enabled), is not a valid configuration. In this case, all three slot variables would be enabled.

EI (Enable Interrupt)

Allows each channel’s process alarm interrupts to be enabled.

AL (Alarm Latch)

Allows latching of each channel’s process alarms to be enabled.

EA (Enable Alarm)

Enable process alarming on the associated channel.

Reserved

Reserved for future expansion and should be set to zero.

EC (Enable Channel)

Enable associated channel.

6.4.4 Input Type and Data Format (Words 3, 9, 15, 21)

This section of the configuration allows the user to define the input type (i.e. 0 to 20mA, 4 to 20 mA, 0 to 10VDC, etc) and the data format for the associated channel.

Table 6-7 (Input Type and Data Format)

15 14 13 12 11 10 9 8 7

654

3210

-10 to +10V

0000

0 to 5V

0001

0 to 10V

0010

4 to 20mA

0011

1 to 5V

0100

0 to 20mA

0101

Reserved

S et To Ze ro

0000

Raw/Prop ortional

000

En gi ne er i ng U ni t s

001

Scaled for PID

010

Perc e nt Rang e

011

Reserved

S et To Ze ro

00000

To Select

Make these bit setting s

Input Type

Data Type

Input Type

Allows the user to configure the input type and range for the associated channel.

Note: To enable HART you must select the 4 to 20 mA range.

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Reserved

Reserved for future expansion and should be set to zero.

Data Format

This selection allows the associated channel to present analog data in any of the followin g fo rmats:

•

Raw/Proportional Data

The value presented to the controller is proportional to the selected input and scaled into the maximum data range allowed by the bit resolution of the A/D converter and filter selected. The raw/proportional data format also provides the best resolution of all the data formats.

If you select the raw/proportional data format for a channel, the data wo rd will be a number between -32767 and +32767. For example, if a 4 to 20 mA input type is selected, 4 mA corresponds to -32767 counts and 20 mA corresponds to +32767. See Determining Effective Resolution and Range.

NOTE: The raw/proportional counts, scaled-for-PID and percent of full-scale data formats may yield the highest effective resolutions, but may also require that you convert channel data to real engineering units in your control program.

•

Engineering Units

When using this data format, the module scales the input data to the actual engineering values for the selected input type. Values are expressed with an assumed decimal place. Refer to Table 6-8 (Data Formats).

The resolution of the engineering units data format is dependent on the ra nge selected and the filter selected. See Determining Effective Resolution and Range.

•

Scaled-for-PID

The value presented to the controller is a signed integer with 0 representing the lower input range and +16383 representing the upper input range.

To obtain the value, the module scales the input signal range to a 0 to +16383 range, which is standard to the PID algorithm for the MicroLogix 1500 and other Allen-Bradley controllers (e.g. SLC). For example, if a 4 to 20 mA input type is selected, 4 mA corresponds to 0 counts and 20 mA corresponds to +16384 counts.

• Percent Range

Input data is presented to the user as a percent of the specified range. The module scales the input signal range to a 0 to +10000 range. For example, if a 4 to 20 mA input type is selected , 4 mA corresponds to 0 counts and 20 mA corresponds to +10000 counts

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Table 6-8 (Data Formats)

Input Range: Signal:

RAW/ Proportional

Engineering Units

PID % Full Scale

-10 to +10V

-10.500V -32767 -10500 -410 -10500

-10.000V -31207 -10000 0 -10000 +10.000V 31207 10000 16383 10000 +10.500V 32767 10500 16793 10500

0 to 5V

-0.500V -32767 -500 -1638 -1000 +0.000V -27068 0 0 0 +5.000V 29646 5000 16383 10000 +5.250V 32767 5250 17202 10500

0 to 10V

-0.500V -32767 -500 -819 -500 +0.000V -29788 0 0 0 +10.000V 29646 10000 16383 10000 +10.500V 32767 10500 17202 10500

4 to 20mA

+3.200mA -32767 3200 -819 -500 +4.000mA -29822 4000 0 0 +20.000mA 29085 20000 16383 10000 +21.000mA 32767 21000 17407 10625

1 to 5V

+0.500V -32767 500 -2048 -1250 +1.000V -25869 1000 0 0 +5.000V 29318 5000 16383 10000 +5.250V 32767 5250 17407 10625

0 to 20mA

+0.000mA -32767 0 0 0 +0.000mA -32767 0 0 0 +20.000mA 29646 20000 16383 10000 +21.000mA 32767 21000 17202 10500

6.4.5 Process Alarm High Setpoint (Words 4, 10, 16, 22)

The user defines the process alarm high value using this signed word element. The range of this value is dictated by the selected data format. When the measured analog signal for the associated channel exceeds the high process alarm, an alarm bit will be set in the input data table that corresponds to the associated channel. See Input Type and Data Format (Words 3, 9, 15, 21) for more information regarding data format.

6.4.6 Process Alarm Low Setpoint (Words 5, 11, 17, 23)

The user defines the process alarm low value using this signed word element. The range of this value is dictated by the selected data format. When the measured analog signal for the associated channel drops below the low process alarm, an alarm bit will be set in the input data table that corresponds to the associated channel. See Input Type and Data Format (Words 3, 9, 15, 21) for more information regarding data format.

6.4.7 Process Alarm Deadband (Words 6, 12, 18, 24)

The deadband is a range through which the measured input may be varied without initiating an alarm response. The deadband will use the data format selected in the channel configuration. See Input Type and Data Format (Words 3, 9, 15, 21) for more information regarding input type and format. The deadband is added to the low alarm value and subtracted from the high alarm value. In both cases, the resulting value mus t

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be reached to clear the associated alarm state. For example, if the high alarm was defined to be 95 and the deadband was 3, a high alarm state would not be cleared until the measured analog signal reached 92. The deadband range can be described by the followin g gr ap h:

Figure 6-3 (Alarm Deadband)

6.4.8 Pad (Words 7, 13, 19, 25)

The pad is used to enforce 32 bit alignment of the confi guration data.

Note: The pad should be set to zero at all times.

6.4.9 Channel X1 HART Slot Variables 0 & 1 (Words 26, 28, 30, 32)

This word defines HART slot variables 0 and 1 for the selected channel. The first byte defines slot variable 0 and the second defines slot variable 1. The variable is defined as a hexadecimal value between 0 and FF.

The HART slot variable is a floating point value that represents a device specific variable defined by the manufacturer for the connected HART field device. This is an optional configuration setting and is not supported by all HART field devices.

For more information regarding slot variables, refer to Chapter 7.

6.4.10 Channel X1 HART Slot Variables 2 & 3 (Words 25, 27, 31, 33)

This word defines HART slot variables 2 and 3 for the selected channel. The first byte defines slot variable 2 and the second defines slot variable 3.

For more information regarding slot variables, refer to Chapter 7.

Where X is the channel number (0 to 3)

Alarm

High

Alarm

Low

Alarm

Deadband

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Section 6.5 Output Data File

The output data file allows you to control module features such as, clearing process alarms, suspending HART acquisition, and allows managing of HART messages to and from HART field devices. The data table structure is shown in the table below.

Table 6-9 (Output Data File)

Word/Bit 15 14131211109876543210

0 HS3 HS2 HS1 HS0 UL3 UH3 UL2 UH2 UL1 UH1 UL0 UH0 1 2 3

4..23

24..45 Reserved

Reserved

M ess ag e Requ es t Bu ffer

Packet Just Sca nned

Message Master Con trol

Messa

e Request S ize

6.5.1 Unlatch Process High Alarms UH0 to UH3 (Word 0)

UH0 through UH3 will unlatch the high process alarms for channels 0 through 3 respectively. Refer to section Filter Frequency and General Settings (Words 2, 8, 14, 20) for more information regarding setting the alarm latch function. To unlatch the high process alarm on a given channel, set the unlatch bit to 1.

Note: Setting the unlatch process alarm bit will no t clear the alarm latch if the conditions that generated the alarm are still present.

Note: It is up to the user to keep the unlatch bit set until verifica tion that the process alarm bit has cleared. When the process alarm bit has cleared the user can then clear the unlatch process alarm bit.

Note: The module will not latch the high process alarm if a transitio n fro m “no alarm condition” to “alarm condition” occurs while the unlatch high process alarm bit is set.

6.5.2 Unlatch Process Low Alarms UL0 to UL3 (Word 0)

UL0 through UL3 will unlatch the low process alarms for channels 0 through 3 respectively. Refer to section Filter Frequency and General Settings (Words 2, 8, 14, 20) for more information regarding setting the alarm latch function. To unlatch the low process alarm on a given channel, set the associated unlatch alarm bit to 1.

Note: Setting the unlatch process alarm bit will no t clear the alarm latch if the conditions that generated the alarm are still present.

Note: The module will not latch the low process alarm if a transition from “no alarm condition” to “alarm condition” occurs wh ile the unlatch low process alarm bit is set.

6.5.3 Hart Suspend HS0 to HS3 (Word 0)

HS0 to HS3 are used to suspend all HART acquisition, except Pass-thr ough messages, on channels 0 through 3 respectively. To suspend HART acquisition, set the associated channel suspend bit to 1. Normal HART acquisition will resume when the bit is cleared.

6.5.4 Packet Just Scanned (Word 1)

When demultiplexing HART data from the module, this output word can be used to speed up the acquisition process by overriding the automatic 500ms acquisition dela y

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between packets.

To override the delay, the packet just scanned word needs to be populated with word seven from the input data file on each scan of the ladder program. Input word seven contains the channel and packet number just scanned.

Note: Input word seven is the first word of twenty which contains the multiplexed HART data for each channel.

6.5.5 Message Master Control (Word 2)

This word is used to control the data flow of a message sent to the module. These messages include module commands such as HART pass-through, HART suspend and resume, and get device information.

6.5.6 Message Request Size (Word 3)

The message request size determines the size of the message, in bytes, that will be sent to the module.

6.5.7 Message Request Buffer (Words 4…23)

The message request buffer contains the data making up the message that will be sent to the module.

6.5.8 Reserved (Words 24…45)

Reserved for future expansion.

Refer to Chapter 7 for more details.

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Section 6.6 Determining Effective Resolution and Range

The effective resolution for an input channel depends upon the filter frequency selected for that channel. The following tables provide the effective resolution for each of the range selections at the six available frequencies. The tables do not include the affects of unfiltered input noise. Choose the frequency that most closely matches your requirements.

Table 6-10 (Effective Resolution)

Range Filter (Hz) Channel Input Value Measured

Max

Deviation +/-10V 28.5 0 5.0V 1 +/-10V 50 1 5.0V 1 +/-10V 60 2 5.0V 1 +/-10V 300 3 5.0V 3 +/-10V 360 0 5.0V 3

0-10V 28.5 1 5.0V 1 0-10V 50 2 5.0V 1 0-10V 60 3 5.0V 1 0-10V 300 0 5.0V 5 0-10V 360 1 5.0V 8

0-5V 28.5 2 2.5V 1 0-5V 50 3 2.5V 1 0-5V 60 0 2.5V 1 0-5V 300 1 2.5V 11 0-5V 360 2 2.5V 12 1-5V 28.5 3 3.0V 1 1-5V 50 0 3.0V 1 1-5V 60 1 3.0V 1 1-5V 300 2 3.0V 9

1-5V 360 3 3.0V 26 0-20mA 28.5 0 10mA 1 0-20mA 50 1 10mA 3 0-20mA 60 2 10mA 1 0-20mA 300 3 10mA 13 0-20mA 360 0 10mA 16 4-20mA 28.5 1 10mA 1 4-20mA 50 2 10mA 1 4-20mA 60 3 10mA 1 4-20mA 300 0 10mA 13 4-20mA 360 1 10mA 20

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Section 6.7 Determining Module Update Time

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 processor. The module update time is equal to the slowest channel step response.

6.7.1 Calculating Module Update Time

To determine the module update time, locate the channel with the slowest step response, this will be the approximate module update time.

Example:

Channel 0: +/- 10 Vdc with 60 Hz filter Channel 1: 4 to 20 mA with 28.5 Hz filter Channel 2: 4 to 20 mA with 300 Hz filter Channel 3: 4 to 20 mA with 28.5 Hz filter

Module Update Time

= slowest step response = 28.5Hz or 108 ms

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Chapter 7 Enabling and Using HART on the 1769sc-IF4IH

This chapter outlines the detailed settings and configuration related to HART communication for the 1769sc-IF4IH module. These settings determine how the module acquires HART data.

The chapter is broken down into the following sections:

• Configuring the module for HART

• HART Packet Data

•

Sending and Receiving Messages

• Module Specific Commands

• HART protocol overview

Attention

The ladder samples and tags referenced in this chapter were created for the Compact Logix controller using RSLogix 5000 software, see Chapter

4. If you plan on using a MicroLogix 1500 controller, refer to Chapter

Section 7.1 Configuring the Module for HART

7.1.1 Configuring the IF4IH Module for (Hart Acquisition/Communication)

In order fo r HART to be active on any given channel, the channel configuration must contain the following basic settings:

The channel must be enabled, set for 4 to 20 mA and the enable HART checkbox must be checked. See figure below.

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Figure 7-1

Attention

HART throughput time can be improved by disabling HART communication on unused channels or channels that include non-HART devices.

Section 7.2 HART Packet Data

7.2.1 How the Module Connects to a Field Device

The HART input module behaves as a HART master in which case the field device is considered the slave. In other words, the master must initiate the communication with the field device and the device simply replies with an appropriate response. Any given channel may have a master, a secondary master (hand held configuration tool), and a slave connected simultaneously. Please see Figure below.

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Figure 7-2

Attention

Hart multi-drop is not supported by the IF4 IH .

The HART module communicates to the controller using the input and output image. Data communicated over the input and output image are transmitted at a rate that is controlled by the PLC. The rate at which data is communicated to the controller and to the compactbus is adjustable by using the RTS (Real Time Sample) and RPI (Requested Packet Interval) respectively. The data passed via the input and output image include, analog data, module status, HART data, and module sp ecific commands.

Module specific commands include the HART pass-through commands, HART susp end, HART resume, and the get HART device information command.

Gathering HART data is accomplished using two processes auto acquisition, and or using the module specific commands.

7.2.2 Auto Acquisition

When a channel is configured for HART, the module will automatically search and establish a connection to any HART field device wired to the channel. Once the mo dule establishes a connection it will begin to acquire HART data, including device specific codes (i.e. Manufacturer ID, serial number, etc.), the four dynamic variables, extended device status, slot variables (if enabled), and any stored ASCII message descriptor that may be present. The HART data retrieved automatically by the module is then displayed in the input image (If4ih0Input.HartData) and is accessible by ladder logic. The HART data will update, on average, every 3.5 seconds if all four channels are enabled for HART. The module initiates the connection by sending a string of HART co mmands to the field device. Please see figure below.

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Figure 7-3 (Auto Acquisition Flow)

The data that is collected from the process described in Figure 7-3 (Auto Acq uisition Flow) is buffered to the module RAM memory. Since the amount of data retur ned from the auto-acquisition process is extensive, the data is multiple xed into five separate packets and for each individual channel. The multiplexed data can be read from a 40 byte array which is located in the Local:X:I.HartData tag. The multiplexed data is demultiplexed using ladder and stored in five different arrays which are structured using packets zero through four. The packets are defined as “user defined data types” and can be seen in Table 7-1 through Table 7-5.

Start

Channel

Switch

Initialized

for

HART?

Connect to field

device

Read device

codes

Read extended

status

Read ASCII

messages

Read PVU and

PVL

Read 4 dynamic

variables

Read slot variables

if enabled

Yes

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Table 7-1 (HART Packet 0)

Tag Nam

Data T

ype

Styl

Descr iption

If4 ih0Packet0 Packet0[4,1] NA Two dimmensi onal array containing

p acket 0 data for al l 4 ch anne ls.

If4ih0 Packet0

[X,0]

Packet0 NA Packet 0 data for channel X

If4ih0 Packet0[X,0].HartChan nelID INT BIN Bits 0 to 3: Channel number (0 – 3).

Bit 4: Searching/Initializing HAR T device Bit 5: HART communication failure or device not f ound Bit 6: Pass-through me ssage pending ( ready) Bit 7: Unused (0) Bi ts 8 to 10: Packet I D Bit 11 through 15: Unused

If4ih0 Packet0[X,0].ManufacturerID SINT DEC

HART device Manufa cturer ID

If4ih0 Packet0[X,0].DeviceType SINT DEC HART device t

e code

If4ih0 Packet0[X,0].NumPreambl es SINT DEC Minimum number of preambles t he de vi ce

uires.

If4ih0 Packet0[X,0].UniversalCmdCode SINT DEC HART Universal com mand set 5.0 If4ih0 Packet0[X,0].XmitterRe v SINT DEC HAR T Tra nsmitter s

ecific re vision

If4ih0 Packet0[X,0].SwRev SINT DEC HART device softwar e revision num be

If4ih0 Packet0[X,0].HwRev SINT DEC HART device har dware revision numbe

If4ih0 Packet0[X,0].HartFlags SINT BIN HAR T fl ags If4ih0 Packet0[X,0].RangeUnits SINT DEC Un i t s code for ran

ge p

aramete

If4ih0 Packet0[X,0].DeviceSe rialNu mber SINT[3] HEX HART de vic e ID numbe

If4ih0 Packet0[X,0].DeviceTag SINT[8] ASCII 8 char acter device ta

If4ih0 Packet0[X,0].DeviceDescripto r SINT[16] ASCII

X represents the module channel number (0 to 3

)

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Table 7-2 (HART Packet 1)

Tag Name Dat a Type

Descri

tion

If4ih0Packet1

Packet1[4,1] N A Two dimensional array containing packet

1 data for all 4 channel s.

If4ih0Packet1

[X,0]

Packet1 NA Packet 1 data for channel X

If4ih0Packet1[X,0].HartChannelID INT BIN

Bits 0 t o 3: Channel number (0 – 3). Bit 4: Searching/Initializing HART device Bit 5: HART c ommunication fa ilure or device not found Bit 6: Pa ss-through message pending ( re ady) Bit 7: Unuse d (0) Bits 8 t o 10: Pa cke t ID Bit 11 throug h 15: Unused

If4ih0Packet1[X,0].HartCommStatus SINT BIN

H ART com mun ication st atu s by te. R efer to appendix D for more details.

If4ih0Packet1[X,0].HartDevStatus SINT BIN

HART device stat us byte. Ref e r t o appendix D for more details.

If4ih0Packet1[X,0].HartPV REAL F LOAT

HART P ri m a ry Va r ia ble

If4ih0Packet1[X,0].HartSV REAL F LOAT

HART Secondary Variable

If4ih0Packet1[X,0].HartTV REAL F LOAT

HART T ertiary V ariabl e

If4ih0Packet1[X,0].HartFV REAL F LOAT

HART F ourt h Var ia bl e

If4ih0Packet1[X,0].HartPVUnits SINT DEC

HART Primary Variable units code

If4ih0Packet1[X,0].HartSVUnits SINT DEC

HART Secondary Variable units code

If4ih0Packet1[X,0].HartTVUnits SINT DEC

HART Tertiary Variable units code

If4ih0Packet1[X,0].HartFVUni ts SINT DEC

HART F ourt h Var ia bl e un its code

If4ih0Packet1[X,0].PV_Assignment SINT DEC

HART Primary Variable code

If4ih0Packet1[X,0].SV_Assignment SINT DEC

HART Secondary Variable code

If4ih0Packet1[X,0].TV_Assignment SINT DEC

HART Tertiary Variable code

If4ih0Packet1[X,0].FV_Assignment SINT DEC

HART F ourt h Var ia bl e code

If4ih0Packet1[X,0].RangeLow REAL F LOAT

Low transmit ter range for analog signal in en

inee ring units

If4ih0Packet1[X,0].RangeHi REAL F LOAT

High t rans mitter range f or analog si gnal in en

inee ring units

If4ih0Packet1[X,0].Pad SINT[4] DEC

Packet pad (32 bit alignment)

X represent s the module chann el n umber (0 to 3

)

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Table 7-3 (HART Packet 2)

Tag Name Data Type

Descri

tion

If4 ih0Packet2 Packet2[4,1] NA Two dimensional array containing packet

2 data for all 4 channels.

If4ih0 Packet2

[X,0]

Pa cket2 NA Packet 2 data for chan n el X

If4ih0 Packet2[X,0].HartChannelID INT BIN Bits 0 to 3: Channel number (0 – 3).

Bit 4: Se arching/Initializing HART device Bit 5: HART communic ation failure or device not found Bit 6: Pass-through message pending (ready) Bit 7: Unused (0) Bits 8 to 10: Packet ID Bit 11 through 15: Unused

If4ih0 Packet2[X,0].S lot0Data REA L Float

Variable for slot 0

If4ih0 Packet2[X,0].S lot1Data REA L Float Variable for slot 1 If4ih0 Packet2[X,0].S lot2Data REA L Float Variable for slot 2 If4ih0 Packet2[X,0].S lot3Data REA L Float

Variable for slot 3

If4ih0 Packet2[X,0].S lot0Uni ts SINT DEC Slot 0 units code If4ih0 Packet2[X,0].S lot1Uni ts SINT DEC Slot 1 units code If4ih0 Packet2[X,0].S lot2Uni ts SINT DEC Slot 2 units code If4ih0 Packet2[X,0].S lot3Uni ts SINT DEC Slot 3 units code If4ih0Packet2[X,0].Slot0Assignment SINT D EC Slot 0 va riable code If4ih0Packet2[X,0].Slot1Assignment SINT D EC Slot 1 va riable code If4ih0Packet2[X,0].Slot2Assignment SINT D EC Slot 2 va riable code If4ih0Packet2[X,0].Slot3Assignment SINT D EC Slot 3 va riable code If4ih0 Packet2[X,0].P ad SINT[12] DEC Packe t

X represents the module channel number (0 to 3

)

Table 7-4 (HART Packet 3)

Tag Nam

Data T

ype

Styl

Descr iption

If4 ih0Packet3 Packet3[4,1] NA Two dimensional array contain ing packet

3 da ta for all 4 channe ls.

If4ih0 Packet3

[X,0]

Packet3 NA Packet 3 data for channel X

If4ih0 Packet3[X,0].HartChan nelID INT BIN Bits 0 to 3: Cha nne l number (0 – 3).

Bit 4: Searching/Initializing HART device Bit 5: HART communication failure or device not f ound Bit 6: Pass-through me ssage pending ( ready) Bit 7: Unused (0) Bi ts 8 to 10: Packet ID Bit 11 through 15: Unused

If4ih0 Packet3[X,0].Message SINT[32] AS CII

32 charact er messa

If4ih0 Packet3[X,0].P ad SINT[4] DEC Pad 32 bit alignment.

X represent s th e module channel number (0 to 3

)

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Table 7-5 (HART Packet 4)

Tag Name Data Type

Descri

tion

If4 ih0Packet4 Packet4[4,1] NA Two dimensional array containing packet

4 data for all 4 channels.

If4ih0 Packet4[X,0].HartChannelID INT BIN

Bits 0 to 3: C hanne l numbe r (0 – 3). Bit 4: Se arching/Initializing HART device Bit 5: HART communic ation failure or device not found Bit 6: Pass-through message pending (ready) Bit 7: Unused (0) Bits 8 to 10: Packet ID Bit 11 through 15: Unused

If4ih0 Packet4[X,0].Date SINT[3] DEC

Stored date in the field device

If4ih0Packet4[X,0].FinalAssemblyNumber SINT[3] DEC The final ass embly numbe r is used for

ide ntif y ing th e mat er ia ls and ele c tronics that com

rise the field device.

If4ih0 Packet4[X,0].ExtendedS tatus SINT[24] DEC The extended status re turned by HART

command 48

If4ih0 Packet4[X,0].Pad SINT[3] D EC Pa d 32 bit ali

nment

X represent s th e mo dule channel number (0 to 3

)

Note: Not all of the HART data that is returned by the process outlined in Figure 7-3 (Auto Acquisition Flow) gets passed to the packets. In order to access the data that is not passed to the packets, you must execute the appropriate HART message using the pass-through command, which will be discussed later in this chapter.

The ladder determines which packet to copy the data to by monitoring the state of bits 0, 1, 2 and 8, 9, 10, found in the first two bytes of the Local: X:I.HartData tag. Bits 0, 1, 2 determine the current channel being scanned and bits 8, 9, and 10 determine the packet number. The ladder example, shown in Figure 7-4, performs this operation.

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Figure 7-4 (Packet Ladder)

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Figure 7-5 (Packet Ladder Continued)

Note: The ladder in Figure 7-4 can be found in the project sample file located on our website at (www.spectrumcontrols.com

)

7.2.3 Packet Interval

The delay between two consecutive packets is called the packet interval. The default time for the packet interval is 500 ms. This delay is controlled by the module.

The user has the ability to reduce the packet interval by utilizing output word 1 (HART Packet Just Scanned) in the output image. See Table 7-6 (Module Output Table). Copying the packet number just scanned to output word 1 allows the module to switch to the next packet before the 500 ms delay expires. See Figure 7-4.

Note: The amount of time saved using this method d epends on the scan time of the ladder and the update time of each individual HART transmitter.

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Section 7.3 Sending and Receiving Messages

Sending messages to and from the module is accomplished using a paging scheme. This paging scheme uses the module’s input and output words to transfer data between t he controller and the module, 38 bytes at a time (i.e. one page at a time). The paging scheme is utilized to minimize the number of bytes sent and received at one time from the module’s input and output i mage. The maximum message size is 257 bytes.

7.3.1 Module Output Tags Used For Messaging

The IF4IH module utilizes 22 words for sending messages and controlling data flow. The table below shows the output image for the IF4IH module. For more detail regarding word 0, refer to Chapter 6.

Table 7-6 (Module Output Table)

Word/Bit

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

0 HS3 HS2 HS1 HS0 UL3 UH3 UL2 UH2 UL1 UH1 UL0 UH0 1 2 3

4..23

24..45 Reserved

Reserved

Message Request Buffer

Packet Just Scanned

Message Master Control

Message Request Size

Word 2 (Message Master Control)

The message master control initiates the paging process and controls the flow of data to and from the module. The data flow control is accomp lished by using the message master control with the message slave control to manage which pages are being sent and what direction the page is going, tha t is, whether the page is being sent to the module or read from the module.

Figure 7-5

Note: Setting the Message Master Control word to zero resets the paging logic within the module and allows the next message to be processed.

Word 3 (Message Request Size)

The message request size is the total number of bytes being sent to the module (not just the current page).

RR|SS

Message Master/Sla ve Control (Hex)

Page being sent

(Page = 38 Bytes)

Page last received

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Words 4…23 (Message Request Buffer)

The message request buffer contains the data being sent to t h e module for the current page (up to 38 bytes).

7.3.2 Module Input Tags Used For Messaging

The module utilizes 22 input words to receive messages and control data flow. T he table below shows the input words used by the module. Refer to Chapter 6 for more information regarding input words 0 through 27.

Table 7-7 (Module Input Table)

Word/Bit

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

0 1 2 3 4 5 OS3 OS2 OS1 OS0 S3 S2 S1 S0 6 L3H3U3O3L2H2U2O2L1H1U1O1L0H0U0O0 7

8..27 28 29

30..49

50..71

(1) Changing bit values is not supported by all controllers. Refer to your controller manual for details.

Reserved

Time Stamp Value

Message Response Size

Not Used

Pad (16 bit alignment)

Message Response Buffer

Analog Input Data Channel 0 Analog Input Data Channel 1 Analog Input Data Channel 2 Analog Input Data Channel 3

HART Packet Data

Message Slave Control

Word 28 (Message Slave Control)

Again, the message slave control is used with the message master control t o mana ge which pages are b eing sent and what direction the page is going, that is, whether the page is being sent to the module or read from the module. Refer to Figure 7-5 for the layout. The message slave control is also used to indicate if a message was rejected by the module. If a message is rejected, the lower 8 bits will be set (i.e. FF Hex) in the message slave control. In the event the message is rejected, the message response buffer will display a fault code in the first byte followed by a checksum in the second. The table below lists the possible responses:

Table 7-8 (Paging Error Codes)

Error Code Description

1 A page was sent out of sequence. 2

While processing page 2,3,etc. The message size was different than it

was for page 1. 3 The message size given exceeds the max allowed. 4 The message page data checksum is not correct.

Word 29 (Message Response Size)

The message response size indicates the total number of bytes being returned by the module.

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7-13

Words 30…49 (Message Response Buffer)

The message response buffer contains the response data for the current page up to thirty eight bytes at a time.

7.3.3 Processing a Message

To complete a message from beginning to end, follow the steps listed b elow:

1. Store the message you wish to send to the module in an array. Remember the message can be up to 257 bytes long, so make the array lar ge enough.

Copy the first page of data, up to 38 bytes, to the message request buffer. If the number of bytes is odd, the last byte in the last word will be padded with a zero.

Calculate the checksum of the message by taking the exclusive OR of all the words within the page (19 max). Place the result into the last word of the message (i.e. word # 20 if a full page).

Enter the size of the message to be sent to the module into the message request size output word.

Add a 1 to the lower nibble of the message master control word (i.e. 0001Hex). The message master control should be zero when the message is started.

Wait for the module to reply that it has received the page without error, by monitoring the second nibble of the message slave contro l (i.e. 0100).

If the lower nibble contains FF, stop the process because th e data is corrupted. The first byte in the message response buffer will contain the paging error code. Refer to Table 7-8 for a description of the errors.

7. Check to see if there are more pages to send by comparing the bytes sent to the message request size. If so, repeat steps 2 through 6. If not, go to step 8.

8. Monitor the lower nibble of the message slave contro l to see if the first page of the response data is ready (0101).

9. Copy the first page of the response data from the message response buffer to a temporary array.

10. Take the exclusive OR of all the words within the page (19 max) with the exception of the last word which is the checksum. Compare the calculated checksum with the checksum stored in the last byte. If they are equal, go to step

11. If they are not, stop the process because t he data is corrupted.

11. Check to see if there is more response data remaining by comparing the bytes received to the message response size. If so, repeat steps 8 through 10. If not, the message is finished. To send another message clear the message master control and repeat the process.

A graphical representation of the process can be seen in Figure 7-6 and Figure 7-7.

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Figure 7-6 Sending Message

Up to 257

tes

MsgMasterControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgRequestSize =

Total size of mess age in

bytes, up to 257 bytes.

MsgRequestBuffer =

One page of data bein g sent

to module. Last byte is

page checksum. 1 page =

38 bytes max.

First

Page

38 Bytes

Second

Page

nth

Page

MsgMasterControl = 00|02 MsgSlaveControl = 01|00 Bytes sent <> MsgRequestSize

Message

to be sent

Up to 257

tes

MsgMasterControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgRequestSize =

Total size of mess age in

bytes, up to 257 bytes.

MsgRequestBuffer =

One page of data bein g sent

to module. Last byte is

page checksum. 1 page =

38 bytes max.

First Page

38 Bytes

Second

Page

nth

Page

MsgMasterControl = 00|02 MsgSlaveControl = 02|00 Bytes sent = MsgRequestSize

Message

to be sent

If checksum

is valid, then

ready to

receive data

from module

MsgMasterControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgRequestSize =

Total size of mess age in

bytes, up to 257 bytes.

MsgRequestBuffer =

One page of data bein g sent

to module. Last byte is

page checksum. 1 page =

38 bytes max.

First

Page

Up to 257

tes

38 Bytes

Second

Page

nth

Page

MsgMasterControl = 00|01 MsgSlaveControl = 00|00 Bytes sent <> MsgRequestSize

Message

to be sent

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Figure 7-7 Receiving Message

MsgSlaveControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgResponseSize =

Total size of response

message, up to 257 bytes.

MsgResponseBuffer = One page of data being

sent to the PLC. Last byte

is page checksum. 1 page

= 38 bytes max.

First Page

Up to 257

tes

38 Bytes

Second

Page

nth Page

MsgMasterControl = 00|02 MsgSlaveControl = 02|01 Bytes received <> MsgResponseSize

Message Returne

MsgSlaveControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgResponseSize =

Total size of response

message, up to 257 bytes.

MsgResponseBuffer = One page of data being

sent to PLC. Last byte is

page checksum. 1 page =

38 bytes max.

First Page

Up to 257

tes

38 Bytes

Second

Page

nth Page

MsgMasterControl = 01|02 MsgSlaveControl = 02|02 Bytes received <> MsgResponseSize

Message Returne

MsgSlaveControl (Hex) =

RR|SS

RR = Page Last Received

SS = Page Being Sent

MsgResponseSize =

Total size of response

message, up to 257 bytes.

MsgResponseBuffer =

One page of data being

sent to PLC. Last byte is

page checksum. 1 page =

38 bytes max.

First Page

Up to 257

tes

38 Bytes

Second

Page

nth Page

MsgMasterControl = 02|02 MsgSlaveControl = 02|02 Bytes received = MsgResponseSize

Message Returne

If checksum

is valid, then

message

complete

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Figure 7-8a (Message Ladder)

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Figure 7-8b

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Figure 7-8c

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Figure 7-8d

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Figure 7-8e

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Figure 7-8f

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Figure 7-8g

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Figure 7-8h

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Figure 7-8i

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Figure 7-8j

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Figure 7-8k

Figure 7-8l

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Figure 7-8m

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Figure 7-8n

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Figure 7-8o

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Section 7.4 Module Specific Commands

The HART input module uses module specific commands. Module specific commands include the HART pass-through, HART suspend and resume, and get HART device information. The commands are passed to the module using the input and output image. Since some messages can be as long as 257 bytes, the data is transported to and from the module 40 bytes at a time using the paging scheme described in the previous section.

The module specific command and accompanying data is passed to the routine in Figure 7-8 using a JSR instruction with parameters. When the routine is executed it will send the message to the module. The response data if any is also converted by this routine and stored in a temporary array where it can be used wit hin the ladder program. See figure below.

Figure 7-9 (Message Flow)

The tables on the following pages show the format for each module specific command.

7.4.1 Get HART Device Information

The Get HART Device Information command is used to gather the device specific information for the connected HART device. The data that is retrieved can be seen in Table 7-11. The information that is gathered by this command is similar to the information gathered from the auto-acquisition process. The key difference is that the Get HART Device Information command pulls the data that has been stored in the module RAM and not directly from the field device.

Table 7-9 (Get HART Device Information Command)

HART Get Device Information – command message packet structure

Get currently cached Device Info rmation for a given channel.

Field Value Definition

HART Channel Number

0x00 – 0x03 (1 byte) Module input

channel number for HART command

Command Number 0x03 (1 byte) The command

number to obtain HART device information

Input Par: Message Size Input Par: Message Body (i.e. Device Sp ecific Command) Return Par: Message Done Return Par: Message Response (i.e. Temp Array)

Routine

Fig 7.9

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Table 7-10 (Response If Device Information Is Not Available)

HART Get Device Information - reply packet structure

Field Value Definition

HART Channel Number

0x00 – 0x03 (1 byte) Module input

channel number for HART command

Status (1 byte)

34 = DR_RUNNING 35 = DR_DEAD (bad request)

Command status

Count (1 byte) Set to 1 Handle 0 Fill byte of zero to

keep command response common among all replies.

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Table 7-11 (Response When Device Information Is Available)

HART Get Device Information - reply packet structure Field Value Definition

HART Channel Number 0x00 – 0x03 (1 byte) Module input channel number for

HART command Status 00 = SUCCESS Command status Count (1 byte) Number of data byt es to following. HART ManufacturerIDCode

(1 byte) CMD#0, Byte 1

HARTDeviceTyp eCode (1 byte) CMD#0, Byte 2 HARTPreamble (1 byte) CMD#0, Byte 3 HARTUnivCmdCode (1 byte) CMD#0, Byte 4 HARTTransSpecRev (1 byte) CMD#0, Byte 5 HARTSoftwareRevision (1 byte) CMD#0, Byte 6 HARTHardwareRe vision (1 byte) CMD#0, Byte 7 HARTFlags (1 byte) CMD#0, Byte 8 Pad for 32 bit alignment (1 byte) HARTDeviceIDNumber (3 bytes) Device ID

number

CMD#0, Bytes 9-11

Pad for 32 bit alignment (1 byte) HARTTag (8 bytes unpacked

ASCII)

CMD#13, Bytes 0-5

HARTDescriptor (16 bytes unpacked

ASCII)

CMD#13, Bytes 6-17

HARTDate (3 bytes) CMD#13, Bytes 18-20 Pad for 32 bit alignment (1 byte) HARTFinalAssemblyNum ber

(3 bytes) CMD#16, Bytes 0-2

Pad for 32 bit alignment (1 byte) HARTMessage (32 bytes unpacked

ASCII)

CMD#12, Bytes 0-23

HARTPVCode (1 byte) CMD#50, Bytes 0, 0xff if not supported HARTSVCode (1 byte) CMD#50, Bytes 1, 0xff if not supported HARTTVCode (1 byte) CMD#50, Bytes 2, 0xff if not supported HARTQVCode (1 byte) CMD#50, Bytes 3, 0xff if not supported HARTPVUnits (1 byte) CMD#3, Byte 4 HARTSVUnits (1 byte) CMD#3, Byte 9, 0 if not present HARTTVUnits (1 byte) CMD#3, Byte 14, 0 if not present HARTQVUnits (1 byte) CMD#3, Byte 19, 0 if not present HARTSlot0Units (1 byte) CMD#33, Byte 1, 0 if not present

Output module use only. HARTSlot1Units (1 byte) CMD#33, Byte 7, 0 if not present

Output module use only. HARTSlot2Units (1 byte) CMD#33, Byte 13, 0 if not present

Output module use only. HARTSlot3Units (1 byte) CMD#33, Byte 19, 0 if not present

Output module use only. HARTPVLowerRange (4 bytes – Floating Point

Value)

CMD#15, Bytes 3-6

HARTPVUpperRange (4 bytes – Floating Point

Value)

CMD#15, Bytes 7-10

Pad for 32 bit alignment (3 bytes)

The command status, the second byte in the reply packet for the module specific command, can return three different responses, SUCCESS, RUNNING and DEAD. These responses echo the state of the module at the time the command is sent. The conditions for each response are as follows:

SUCCESS will be sent back when all of the following conditions are met:

•

Command and HART Channel number are both valid.