Allen-Bradley ControlLogix User Manual

1756-6.5.3 - December 1999
Chapter 1
ControlNet Communication Basics
What This Chapter Contains
This chapter provides an overview of the primary features and requirements
of ControlNet communication using the 1756-CNB module.
Module Versions
The ControlLogix ControlNet interface module is available in redundant
(1756-CNBR) and non-redundant (1756-CNB) configurations. Either
version may be used in the example applications, but for simplicity, we refer
to both as the 1756-CNB module.
Before you go any further . . .
The example applications use series B (firmware version 2.10) 1756-CNB
modules. If you currently have series A modules, you can obtain free
firmware upgrades to series B by contacting Rockwell Technical Support.
See page P-6.
For information about See page
Module Versions 1-1
Support for up to 64 Bidirectional Connections 1-2
Bridging Unscheduled Data 1-3
Understanding the Producer/Consumer Model 1-4
Processing Produced and Consumed Tags 1-5
Control of Scheduled I/O Communications 1-6
Understanding the Control and Information Protocol 1-6
Understanding the Network Keeper 1-7
Network Update Time (NUT) 1-7
Requested Packet Interval (RPI) 1-7
Actual Packet Interval (API) 1-8
Rack Optimized and Direct Connections 1-8
Default Parameters 1-10
For further information on the differences between using the redundant and
non-redundant versions of the 1756-CNB module in your network, refer to
the ControlNet Cable Planning and Installation Manual, publication
1786-6.2.1.

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)