Allen-Bradley ControlLogix User Manual

1756-6.5.3 - December 1999
Allocating Communication Connections A-7
Optimizing produced tags
Each produced tag requires connections that can be used for other controller
operations. To minimize the of produced tags, and the number of required
connections, consider grouping data into an array or a user-defined structure
and producing only that array or structure, as long as the array or structure is
not larger than 500 bytes.
Compare the following two examples to see how a user-defined data type
(structure) reduces the number of connections required to produce the same
data.
Example 1: Producing data as individual tags
Example 2: Producing data as a user-defined data type (structure)
Connections for consumed tags
Each consumed tag requires one connection for the controller that is
consuming the tag.
Produced Tag Data Type
Connection
for the Tag
Number of
Consumers
Total Connections
height
width
weight
W_flag
L_flag
DINT
DINT
REAL
DINT
DINT
1
1
1
1
1
3
3
3
3
3
4
4
4
4
4
Total: 20 connections
Produced Tag Data Type
Connection
for the Tag
Number of
Consumers
Total Connections
Load_Info User-defined structure of:
height (DINT)
width (DINT)
weight (REAL)
W_flag (DINT)
L_flag (DINT)
1 3 4
Total: 4 connections

Allen-Bradley ControlLogix Specifications

General

Communication	EtherNet/IP, ControlNet, DeviceNet, DH+
I/O Capacity	Up to 128, 000 I/O points (varies by configuration)
Redundancy	Supported (with specific modules)
Programming Software	Rockwell Automation Studio 5000 Logix Designer
Operating Temperature	0°C to 60°C (32°F to 140°F)
Programming Languages	Ladder Logic, Function Block Diagram, Structured Text, Sequential Function Chart
Modularity	Yes
Certifications	UL, CE
Processor Type	Multiple options available, including standard, safety, and extreme environment processors
Power Supply	Multiple options available, including standard and redundant power supplies with various voltage ranges (e.g., 24V DC, 120/240V AC)

Summary

Chapter 1: ControlNet Communication Basics

Communication Models and Protocols

Chapter 2: Installing the ControlNet Network

Installing and Configuring Interface Card

Installing ControlLogix and PLC-5C Modules

Connecting the ControlNet Network

Chapter 3: Logix5550 to Logix5550 Unscheduled Messaging

Chapter 4: Logix5550 to Logix5550 Scheduled Communication

Producer and Consumer Application Setup

Network Configuration and Communication Testing

Covers scheduling the network, verifying properties, and testing communication.

Chapter 5: Logix5550 Controller to PLC-5C Unscheduled Messaging

Chapter 6: Logix5550 Controller to PLC-5C Scheduled Communications

Producer Application Setup and Network Scheduling

PLC-5C Configuration and Communication Testing

Details configuring the PLC-5C to receive data and testing the communication.

Chapter 7: PLC-5C to Logix5550 Controller Unscheduled Messaging

Example Setup and PLC-5C Program Creation

Program Download and Message Verification

Chapter 8: PLC-5C to Logix5550 Controller Scheduled Communications

Network and Controller Configuration

Guides configuring the ControlNet network, PLC-5C, and Logix5550 consumer.

Producer Setup and Network Scheduling

Details creating the PLC-5C producer application and scheduling the network.

Communication Verification

Chapter 9: PLC-5C to PLC-5C Unscheduled Messaging Over Two ControlNet Networks

Example Setup and Program Creation

Guides system setup, application creation, and ladder program development.

Program Download and Communication Testing

Details downloading the program and testing the message bridging.

Chapter 10: Controlling I/O Over a ControlNet Network

I/O Configuration and Setup

Guides adding local and remote CNB modules and I/O modules to the configuration.

Ladder Logic, Download, and Network Scheduling

Details editing tags, creating ladder logic, downloading, and scheduling the network.

Testing Remote I/O Operation

Chapter 11: Adding an I/O Chassis to an Existing ControlNet Network

Network Expansion Configuration

Guides adding a second remote CNB module and analog I/O to the network.

Logic, Download, and Network Scheduling

Details editing tags, modifying logic, downloading, and scheduling the expanded network.

Testing Analog Output Operation

Chapter 12: Troubleshooting

Module Status Indicators and Causes

ControlNet Network Status Indicators

Appendix B: Creating Produced and Consumed Tags

Tag Creation Fundamentals