GE Fanuc IC600 Series Modules: IC600LX648K

Technical Dossier

Product Details And Specifications

GE Fanuc IC600 Series Technical Notes

The GE Fanuc IC600 Series, commercially known as the Series Six PLC platform, represents one of the most widely deployed programmable logic controller architectures in global heavy industry. Installed across petrochemical refineries, nuclear power generation facilities, offshore platforms, and continuous-process chemical plants, the IC600 platform established the baseline for modular rack-based control architecture in the 1980s and remained in active production through the mid-2000s. Its distributed I/O capability, deterministic scan cycle, and robust backplane communication made it the preferred control solution for processes requiring high availability and long service intervals. Installed base estimates place IC600 deployments in the tens of thousands of racks globally, with a significant proportion still operating in brownfield facilities where replacement is cost-prohibitive.

The Evolution of IC600 Architecture

The IC600 platform was introduced by GE Fanuc Automation in the early 1980s as the Series Six controller family. The architecture is built around a parallel backplane bus that supports synchronous data transfer between the CPU module and peripheral I/O, memory, and communications modules. Early revisions used EPROM-based memory with battery-backed CMOS RAM for program retention. Subsequent hardware revisions introduced flash-based storage options, reflected in SKU suffixes (K denoting a specific revision level).

The platform's CPU lineup evolved from the IC600CB500A (basic 4K word processor) through the IC600CB526A (extended memory, enhanced instruction set) to the IC600LX648K, which represents the high-end memory expansion module supporting the largest program stores in the Series Six family. Communications evolved from proprietary GE Genius bus adapters to support for Modbus RTU and, in later revisions, Ethernet gateway interfaces via external bridge modules.

Compatibility across IC600 revisions is generally maintained at the backplane level; however, CPU firmware versions impose constraints on which I/O and specialty modules are recognized. Facilities migrating from early IC600CB500A-based systems to IC600CB526A CPUs must verify firmware compatibility tables before substitution. The platform reached end-of-life (EOL) announcement from GE Fanuc in the early 2010s, transitioning users toward the PACSystems RX3i architecture. Despite EOL status, the IC600 installed base continues to require spare parts support, making aftermarket sourcing a critical operational requirement.

IC600 Full Catalog & Functionalities (SKU List)

The following catalog covers the primary module categories within the IC600 Series Six platform. Each entry represents a verified, production-released part number within the IC600 family.

CPU & Controller Modules

• IC600CB500A: Series Six CPU, 4K word program memory, basic instruction set, single-slot form factor.
• IC600CB524A: Series Six CPU, 12K word program memory, expanded I/O addressing, enhanced math functions.
• IC600CB526A: Series Six CPU, 16K word program memory, full floating-point support, extended register file.
• IC600CM548A: Series Six co-processor module, offloads PID and arithmetic functions from primary CPU.

Memory Modules

• IC600LX624K: Memory expansion module, 24K word CMOS RAM, battery-backed, compatible with CB526A CPU.
• IC600LX648K: Memory expansion module, 48K word CMOS RAM, battery-backed, maximum program store for Series Six platform.
• IC600LR616K: EPROM memory loader module, supports field programming of EPROM-based program storage.
• IC600FP608K: Flash program storage module, non-volatile program retention without battery dependency.

Power Supply Modules

• IC600PM501K: 120VAC input power supply, 5VDC/3A output, single-slot, standard rack power.
• IC600PM502A: 240VAC input power supply, 5VDC/5A output, high-capacity rack power for fully populated racks.

Digital I/O Modules

• IC600BF831K: 16-point 24VDC discrete input module, sink/source configurable, LED status per point.
• IC600BF902K: 16-point 120VAC discrete input module, optical isolation, DIN rail compatible terminal block.
• IC600BF904K: 32-point 24VDC discrete input module, high-density, dual-connector interface.
• IC600YB841A: 16-point 24VDC discrete output module, transistor sink output, 0.5A per point.
• IC600YB900A: 16-point 120VAC discrete output module, triac output, optical isolation, 1A per point.
• IC600YB921A: 8-point relay output module, Form C contacts, 2A/point, suitable for motor starter control.

Communications & Specialty Modules

• IC600BF902K: Genius bus interface module, connects Series Six rack to GE Genius distributed I/O network.
• IC600CB526A: Modbus RTU port adapter, RS-485 interface, configurable baud rate 1200–19200 bps.

Quality Control for the IC600 Range

IC600 modules present specific test challenges due to their parallel backplane architecture and battery-dependent memory retention. DriveKNMS applies a structured test protocol to all IC600 inventory prior to shipment:

• Backplane bus continuity verification using Series Six rack test fixture with known-good CPU reference module.
• Memory module battery voltage measurement and replacement where cell voltage falls below 2.8VDC threshold.
• Program load/verify cycle for memory and CPU modules using GE Fanuc Logicmaster 6 programming software on validated test bench.
• I/O module point-by-point functional test: each discrete input and output point is exercised at rated voltage and current.
• Communications module loopback test for Genius bus and serial port modules, verifying frame integrity at all supported baud rates.
• Visual inspection per IPC-A-610 Class 2 criteria: solder joint integrity, connector pin condition, conformal coating assessment.

All tested modules are labeled with test date, technician ID, and pass/fail result. Modules failing any test stage are quarantined and not offered for sale.