IC697MEM733 GE Fanuc Series 90-70 256 KB CMOS Expansion Memory Module

IC697MEM733 | Series 90-70 CMOS Memory Expansion

The GE Fanuc IC697MEM733 is a 256 KB, 32-bit CMOS expansion memory module for the Series 90-70 PLC family. It provides additional user memory for supported CPU configurations and can be configured for program or data storage, according to the CPU and system documentation.

This module is designed as a CPU-associated daughterboard rather than a separate rack module. Before ordering, confirm the exact CPU model, memory configuration, and installation requirements for the existing controller.

Memory Module Profile

• Capacity: 256 KB CMOS expansion memory.
• Architecture: 32-bit memory module, as identified in the supplied product description.
• Storage use: supports program and data storage, subject to CPU configuration.
• Installation: daughterboard installation in a compatible CPU assembly; does not use a separate rack slot, according to the supplied description.
• Retention: battery-backed retention is specified for user memory; flash memory is described as retaining data without battery support.

Technical Specifications

Specification note: The supplied information identifies compatibility with several Series 90-70 CPU models, but the exact supported CPU list and memory configuration should be confirmed using the GE Fanuc hardware manual for the installed CPU. Do not assume all Series 90-70 processors accept this memory module.

Compatibility and Installation Considerations

The product description identifies the IC697MEM733 as being used with GE Fanuc Series 90-70 CPU modules, including models listed as 789, 788, 782, 781, and 780. Verify these CPU designations against the installed system’s exact catalog numbers and documentation before purchase.

• CPU match: confirm the CPU model and memory daughterboard support.
• Memory allocation: check whether the application uses the module for program memory, data memory, or a defined combination.
• Configuration retention: document the existing program, data, and retention arrangement before replacing or moving memory hardware.
• Physical installation: follow the CPU-specific procedure for accessing and installing the daughterboard. Do not force the connector or assume the module orientation.
• Battery handling: follow the manufacturer’s approved battery-replacement procedure. The supplied description recommends installing the replacement battery before removing the existing one to reduce the risk of losing retained memory.

Typical Equipment and Application Scenarios

• Legacy Series 90-70 PLC systems: memory expansion for compatible CPU-based control platforms.
• Machine and process control: supports applications whose PLC program or retained data require the configured memory capacity.
• Plant equipment maintenance: replacement of a matching memory daughterboard during repair or planned service.
• Control-system restoration: helps restore a documented memory arrangement after a module fault, subject to program backup and CPU compatibility.
• Data-retention applications: supports retention needs where the CPU and memory architecture use battery-backed CMOS memory.

The module is a memory component, not a standalone PLC CPU, communications interface, or I/O module. Its role depends on the processor and the system’s configured memory architecture.

Diagnostics and Maintenance: Protect the Stored Application

Memory-related faults can appear as program loss, unexpected startup behavior, retained-data errors, or CPU diagnostic indications. A disciplined check helps distinguish a memory-module problem from a CPU, battery, or application issue.

• Review CPU diagnostics: record fault codes and status messages before clearing faults or cycling power.
• Verify program integrity: compare the running application with a known-good backup and confirm that the intended program is present.
• Check retention conditions: inspect battery status and service history, and verify whether the affected memory area requires battery backup.
• Inspect the daughterboard connection: with the system safely de-energized and following the CPU manual, check seating and connector condition.
• Confirm configuration: verify the CPU recognizes the installed memory and that the application’s memory allocation matches the intended setup.
• Plan battery service: use the specified battery and approved replacement procedure. Do not rely on the stated nominal shelf life as a guarantee of remaining battery capacity.

Important: The supplied description states that flash memory is retained through power loss with or without the battery, while CMOS user memory relies on battery-backed retention. Identify which memory areas hold the program and critical data before carrying out battery or memory service.

Global PLC Spare HUB’s Insight

For legacy PLC memory, the key purchasing risk is an incorrect CPU or memory-architecture match—not simply choosing a module with the same capacity. Before replacing an IC697MEM733, record the CPU’s full catalog number, the current memory configuration, the application backup status, and the battery arrangement.

Where a controller is still running production, create and verify a current program and data backup before disturbing the memory hardware. If the original application is not backed up, treat memory replacement as a controlled maintenance task and involve personnel familiar with the Series 90-70 CPU and its retention behavior.

Warranty and Shipping

• Warranty: 12 months.
• Shipping options: FedEx, UPS, and DHL, subject to destination and shipping arrangements.
• Quotation details: provide the catalog number IC697MEM733, quantity, CPU model, destination, and any required product condition or packaging details.

Frequently Asked Questions

1. What details are needed to verify IC697MEM733 compatibility?

Provide the full catalog number of the Series 90-70 CPU, the current memory-module identification, and the intended program/data-memory use. Confirm the combination against the CPU hardware manual rather than relying only on the PLC family name.

2. Should I back up the PLC before replacing this memory module?

Yes. Make and verify a current application backup, including any relevant retained data and configuration information, before removing or replacing memory hardware. A backup is especially important when the system’s memory allocation or retention behavior is not fully documented.

3. Does a stated six-month retention period mean the program is guaranteed to survive six months without power?

No. The supplied figure is a nominal retention specification, not a guarantee for an aged module or battery. Actual retention depends on battery condition, storage and operating temperature, and the memory areas in use. Confirm the manufacturer’s retention conditions and maintain verified backups.

4. How should I evaluate a spare memory module for an older PLC?

Check the exact catalog number, supported CPU, memory capacity, daughterboard form factor, and the role of the memory in the existing application. Also ask about product condition, warranty, and whether the module can be inspected or tested before installation.

5. What should I investigate if the CPU reports a memory fault after installation?

Capture the diagnostic message, verify the module is correctly seated, and check that the CPU supports the installed memory configuration. Then confirm program integrity and battery/retention status using the applicable CPU manual. Avoid repeated power cycling or clearing diagnostics before preserving fault information and verifying the application backup.

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