User Manual

Chapter

Publication

1771-6.5.124 – August 1997

Planning to Use Your

ControlNet Adapter Module

This chapter explains how the adapter operates on ControlNet and

provides information to assist in configuring your system. This

includes:

• overview of adapter operation

• discrete I/O data transfer

• configuring discrete I/O data transfers

• nondiscrete I/O data transfers

• using ControlNet I/O (CIO) instructions

• mapping directly into processor memory, including examples of

nondiscrete input module and output module communication

• configuring nondiscrete I/O data transfers

The controlling processor (network address 01) on ControlNet

contains an I/O map table. This map table stores the information

necessary for communications to be established. Each map table

entry corresponds to 1 transfer of data between the processor and an

I/O rack, or between the processor and another ControlNet processor.

The information in each map table is used to open a logical

“connection” between 2 devices.

Connections are established between the processor and each adapter

to exchange input and output data on the network. Status information

is transferred along with the I/O data and is stored in a separate

status file in the specified processor. Refer to the ControlNet PLC–5

Programmable Controller (Phase 1.5) User Manual, publication

1784-6.5.22, for more on status information available.

Important: The processor compares the specified module type (in

the map table) with the device with which

communication is being attempted. Therefore, when

changing from a 1771-ACN15 to a 1771-ACNR15, or

vice versa, you must specify the new module type in the

map table.

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Operation