Functions

The Programmable Coprocessor Module (PCM) is a

Coprocessor to the PLC CPU.  It can be programmed

to perform operator interface, real time computations,

data storage, data acquisition and data communica

tions functions.  It communicates with the PLC CPU

over the backplane and can access user and system

data using extensions to the powerful MegaBasic lan

guage.  No application program support is required in

the PLC CPU.

Many PCMs can be supported in a single IC697 PLC

system and each can accommodate an optional ex

pansion memory up to 512 Kbytes.

Dual tasking allows running a MegaBasic program at

the same time the PCM is used as a communications

interface.  Operation of the module may be initialized

by a pushbutton or by an attached PCM development

system.  The status of the PCM is indicated by three

green LEDs on the front of the module.

Installation

• Installation should not be attempted without refer

ring to the applicable Programmable Controller

Installation Manual (see reference 5).

• Make sure rack power is off.

• Install expansion memory if required.

• Connect the battery to either of the battery con

nectors on the module. (See figure 2)

• Install in the rack. (See figure 1)

• Turn on power.

The module should power up and blink the top LED.

When the diagnostics have completed successfully the

top LED stays on.