GE Fanuc IC693PCM301 Programmable Coprocessor Module Overview

IC693PCM301: The Programmable Coprocessor in a Series 90-30 Rack

The IC693PCM301 is the programmable coprocessor module for the Series 90-30 platform, and its role is to execute logic that does not belong in the CPU: time-critical routines, high-speed counting, and machine-specific sequences that would otherwise have to be built from main CPU scans.

That division of labour is the design principle behind it. The main CPU handles supervisory logic where scan time is not critical; the coprocessor handles work that has to happen on a predictable schedule regardless of what the main CPU is doing. On a machine where main CPU load has grown over years, moving the time-critical part onto the coprocessor is often what keeps the scan time acceptable without replacing the CPU.

The GE IC693PCM301 Programmable Coprocessor Module enhances Series 90-30 PLC communication with dual serial ports, supporting CCM and ASCII/BASIC modes for reliable industrial automation.

Series 90-30 Coprocessor and Special Modules

Series 90-30 carried a range of special-purpose modules alongside the coprocessor. Confirming the module function against the application requirement is what avoids a module that fits the rack but not the task:

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Deciding Between Coprocessor and a CPU Replacement

When main CPU scan time becomes a problem, there are two responses, and they are not equivalent in cost. Replacing the CPU addresses total capacity; moving time-critical routines to the coprocessor addresses the specific part of the load that is actually too slow.

The cheaper option is the one that fits the actual problem. If a small fraction of the logic accounts for most of the scan time, moving that fraction to the coprocessor resolves it without a platform change. If the load is broadly distributed, no single routine is the bottleneck and a capacity change is the honest answer.

Where the Coprocessor Is the Right Part

The coprocessor is the right choice for work with a hard timing requirement: encoder indexing, high-speed counter functions, and machine sequences where a missed millisecond has consequences. It is the wrong choice for supervisory logic that the main CPU already handles within scan time — putting that on the coprocessor adds a communication path without removing a bottleneck.

Integration and Commissioning

The coprocessor shares the rack backplane with the CPU, so its execution is coordinated with the main CPU rather than fully independent. Commission it with the main CPU loaded as it will be in production, not idle — a routine that meets its timing on an empty system can still miss it once the main CPU scan grows.

Supply & terms: Stock status: In Stock · Condition: New · Warranty: One Year · Origin: US. Listed by AutoDCS Tech Parts Team · Last updated 2026-10-07.

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