Allen-Bradley Logix 5000 Series User Manual

Produce and Consume a Tag
Chapter 1
Rockwell Automation Publication 1756-PM011J-EN-P - February 2018 23
Example:
Reconstruct a floating point value.
The two MOV instructions reverse the order of the integers as the
integers move to a new location. Because the destination of the COP
instruction is a floating-point address, it takes two consecutive
integers, for a total of 32 bits, and converts them to a single floating-
point value.
RPI limitations and negotiated behavior vary depending on the version of the
Logix Designer application that is running on your controllers.
Behavior in releases v28 and later
In releases v28 and later, the first consumer of a produce tag determines the
RPI at which data is produced. All subsequent consumers must request the
same RPI value as the first consumer or they fail to connect and display error
code 0112.
The first consumer of a produce tag is the device that sends the first
consumer connection to the producing controller. The first consumer request
is based on the order in which the producer and consumer control system
powers up, so the first consumer can change if power is cycled to the system.
You cannot configure a device to be the first consumer. There is no way to
tell which consumer will send the first request to the producing controller, so
you must plan accordingly when configuring multicast produce tags. See
Considerations when migrating projects that contain multicast produce tags
on page 13 for more information.
RPI limitations and
negotiated default

Allen-Bradley Logix 5000 Series Specifications

General

Brand	Allen-Bradley
Model	Logix 5000 Series
Category	Controller
Language	English

Summary

Essential User Information and Safety Guidelines

Manual Updates and Feature Highlights

Global Manual Changes Summary

Overview of general updates impacting multiple sections of the manual.

Summary of New and Enhanced Features

Highlights specific topics that have been newly added or significantly improved.

Producing and Consuming Data Tags

Additional Resources for Logix 5000

Lists related Rockwell Automation documentation and support resources for further information.

Introduction to Logix 5000 Tag Sharing

Explains the fundamental concepts of producing and consuming system-shared tags.

Controller and Network Compatibility for Tag Sharing

Details controller support and network requirements for enabling tag sharing.

Connection Requirements for Tag Data Exchange

Explains how tag sharing affects controller connections and resource utilization.

Migrating Projects with Multicast Produce Tags

Addresses challenges and considerations for migrating projects containing multicast produce tags.

Best Practices for Organizing Data Tags

Provides guidelines for structuring tags to optimize the efficiency of data transfer.

Managing Network Bandwidth Limitations for Tags

Offers strategies to effectively manage network bandwidth when transferring tag data.

Step-by-Step Guide: Creating a Produced Tag

Detailed instructions for configuring a tag to produce data for other controllers.

Step-by-Step Guide: Creating a Consumed Tag

Detailed instructions for configuring a tag to consume data from a producer.

Integration Steps for PLC-5C Controllers

Outlines specific procedures required for data sharing with PLC-5C controllers.

Understanding RPI Limitations and Defaults

Explains Request Packet Interval (RPI) behavior and default settings across different software versions.

Configuring Producer RPI Limits and Defaults

Details how to set RPI ranges and default values for producer tags.

Unicast Connection Options for Tag Data

Discusses the configuration and implications of using unicast connections for tag data exchange.

Setting Up the Consuming Controller for RPI Negotiation

Guides on configuring the consuming controller to accept producer-provided RPIs.

Verifying Consumed Tag Acceptance and RPI Value

Steps to confirm successful RPI acceptance and value by the consuming tag.

Produced and Consumed Tag RPI Scenarios

Illustrates common scenarios detailing RPI exchange between producers and consumers.

Troubleshooting RPI I/O Faults and Errors

Describes common error messages related to RPI acceptance and negotiation issues.

Transferring Large Data Arrays

Introduction to Packetized Array Transfer

Introduces the concept of packetizing large arrays for efficient data transfer between controllers.

Procedure: Producing a Large Array

Provides detailed instructions for creating and configuring tags to produce large arrays.

Procedure: Consuming a Large Array

Provides detailed instructions for configuring tags to consume large arrays transferred via packets.