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.