What This Chapter Contains; Module Versions; Before You Go Any Further - Allen-Bradley ControlLogix User Manual

What This Chapter Contains

Module Versions

ControlNet Communication Basics
This chapter provides an overview of the primary features and requirements
of ControlNet communication using the 1756-CNB module.
For information about
Module Versions
Support for up to 64 Bidirectional Connections
Bridging Unscheduled Data
Understanding the Producer/Consumer Model
Processing Produced and Consumed Tags
Control of Scheduled I/O Communications
Understanding the Control and Information Protocol
Understanding the Network Keeper
Network Update Time (NUT)
Requested Packet Interval (RPI)
Actual Packet Interval (API)
Rack Optimized and Direct Connections
Default Parameters
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.
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.

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.
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1756-6.5.3 - December 1999