GE-FanucIC600CM552ASeries Six Combined Memory Module, 2K Logic, for Model 60 / 600 / 6000 CPUs

Product Description

What this part is

A GE Fanuc Series Six combined memory module, IC600CM552A, at the 2K logic capacity. On a Series Six controller this module is where the machine’s program lives: it carries the logic memory that holds the ladder program and the register memory that holds data words, both on the same card, plus the internal memory support circuitry.

The memory is CMOS RAM, volatile, retained by a lithium-manganese-dioxide backup battery in the controller. It is a memory module: no processor, no I/O points, no display.

Decoding the order code

IC: GE Fanuc Automation industrial controls prefix.

600: the Series Six PLC family (Model 60 / 600 / 6000). Neighbouring GE Fanuc groups do not interchange: IC610 is Series One, IC630 is Series Three, IC693 is Series 90-30, IC697 is Series 90-70.

CM: the Series Six module class for memory modules. Series Six CPU and control modules carry CB; I/O-rack functional and interface modules carry BF; the later combined memory cards carry LX.

552: the specific memory module and its capacity within the family. Siblings in the same group carry different capacities — IC600CM542 and IC600CM548 are other Series Six memory modules, not substitutes.

A: the hardware revision letter. A revision suffix, not a different product.

Published specifications

Function: Combined memory module — logic memory plus register memory plus internal memory circuits.

Logic memory: 2K 16-bit words.

Memory technology: CMOS RAM, battery-backed by a lithium-manganese-dioxide cell.

Platform: GE Fanuc Series Six, Model 60 / 600 / 6000 CPUs.

Word width: 16-bit throughout, for both logic and register memory.

Series Six Plus behaviour: parity checking is not provided when the module is used in a Series Six Plus PLC.

What these specs mean in practice

2K of logic is the number to check first. Series Six combined memory modules were built at 2K and 4K logic, with correspondingly different register counts. A control whose program was written for a 4K module will not load into a 2K one — the program simply will not fit, and the failure looks like a memory fault rather than a capacity problem. The capacity marked on the outgoing module, or the program size in a Logicmaster listing, is the figure that settles it.

The parity behaviour matters on Series Six Plus. This module works in a Series Six Plus PLC and provides no parity checking there, so an application that relies on memory parity detection calls for a parity-capable module.

Because the memory is volatile CMOS RAM, the backup battery is what retains the ladder program across a power-down. A used memory module is best treated as blank, with an offline copy of the program on hand to reload.

Quantity and configuration

One combined memory module, sold as 1 piece. New old stock in an opened box. The lithium backup battery, the Series Six CPU and I/O racks, the rack power supply, the CPU or control module, I/O modules, terminal blocks and connector kits, a programmer, Logicmaster software and programming cable, and the ladder program and register data are each separate items.

Interchange guidance

Searchable equivalents of the same part: IC600CM552A, IC600CM552, IC600-CM-552-A, IC600 CM 552 A, IC600CM552-A. Other revision letters of IC600CM552 are the same module at a different revision. Not interchangeable: IC600CM542, IC600CM548 and the IC600LX6xx combined memory cards are different Series Six memory modules with different capacities or architectures, and modules from Series One, Series Three or the Series 90 families are different platforms entirely.