GE IC693PCM301M Coprocessor | 16MHz, 768KB Memory

Core Processing Capabilities

The GE IC693PCM301M offloads complex tasks from the main PLC CPU. This programmable coprocessor module handles math-intensive calculations and data logging. It executes C language programs for custom automation functions. Consequently, the module frees the main processor for faster ladder logic execution.

Physical Dimensions and Board Layout

This coprocessor module measures 140 mm in total length. Its width reaches 115 mm for a single-slot form factor. The board thickness stands at 30 mm including all component heights. You will find 312 discrete components on this four-layer PCB. These include a 16-bit microprocessor, memory chips, and communication controllers. The GE IC693PCM301M weighs approximately 310 grams for secure mounting.

Processor and Memory Configuration

The GE IC693PCM301M houses a 16-bit 80C186 microprocessor running at 16 MHz. This CPU executes user-written C or assembly language programs. The module contains 512 KB of flash memory for firmware and application storage. It also includes 256 KB of battery-backed SRAM for runtime variables. A replaceable lithium battery preserves this data during power loss. The battery provides a typical retention period of two years.

Communication Ports and Interfaces

This coprocessor module offers two RS-232/485 software-selectable serial ports. Each port supports baud rates up to 115.2 kbps. A dedicated 15-pin D-sub connector serves as the primary programming interface. The module also includes a 20-pin ribbon cable header for backplane communication. Four status LEDs indicate power, run, communication, and battery health.

Programming and Software Support

The GE IC693PCM301M supports C language programming using the PCM Development Kit. Users can also write assembly code for time-critical routines. The module executes programs stored in its flash memory independently. It communicates with the main CPU through shared backplane memory. A built-in real-time clock enables time-stamped data logging functions. The clock uses a separate battery for continuous operation.

Energy Storage and Power Requirements

The GE IC693PCM301M draws 380 mA from a 5 V DC logic supply. It also requires 50 mA from a 24 V DC field supply. The board incorporates five 47 µF tantalum capacitors for power decoupling. Total stored energy reaches approximately 0.04 joules at nominal voltage. The module dissipates 2.2 W of heat during normal operation.

Parameter	Specification
Model	IC693PCM301M
Brand	GE (General Electric)
Category	Programmable Coprocessor Module
Length x Width	140 x 115 mm
Thickness	30 mm
Weight	310 grams
Component Count	312
Microprocessor	16-bit 80C186 at 16 MHz
Flash memory	512 KB
Battery-backed SRAM	256 KB (2-year retention)
Serial ports	2 x RS-232/485 (selectable)
Baud rate support	Up to 115.2 kbps
Programming connector	15-pin D-sub
Backplane connector	20-pin ribbon cable
Programming languages	C and assembly
Real-time clock	Yes (battery-backed)
Status LEDs	4 (power, run, comms, battery)
Logic supply	380 mA at 5 V DC
Field supply	50 mA at 24 V DC
Decoupling capacitors	5 x 47 µF tantalum
Total stored energy	0.04 Joules
Power dissipation	2.2 W
Operating temperature	0°C to +60°C

Installation and Programming Notes

You must install this module in any slot of a Series 90-30 rack. Always replace the lithium battery during scheduled maintenance every 18 months. Then, compile your C program using the PCM Development Kit. The module requires configuration through the main PLC programming software. Regular firmware updates add support for new library functions.