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IC697CPM790-GD — GE Fanuc Series 90-70 64 MHz CPU Module
The IC697CPM790-GD is a high-performance Central Processing Unit module for the GE Fanuc Series 90-70 programmable logic controller family. Driven by a 64 MHz microprocessor, it is one of the fastest CPUs ever built for the 90-70 platform, delivering the scan-time performance needed for large, complex control programs.
Known within the family as the "CPM790", this module handles real-time control of large I/O networks, floating-point math, and process-critical logic. The "-GD" suffix denotes a specific revision/variant of the base unit. As one of the flagship CPUs of a platform still running in countless plants worldwide, it remains a sought-after replacement and spare for legacy Series 90-70 systems where upgrading the entire control architecture is neither practical nor economical.
Key Specifications
| Manufacturer | GE Fanuc / General Electric (now Emerson) |
| Model / Part Number | IC697CPM790-GD |
| Product Line | Series 90-70 (IC697) |
| Product Type | Central Processing Unit (CPU) Module |
| Processor Speed | 64 MHz |
| Floating-Point Support | Yes (hardware floating-point coprocessor via 80-bit floating-point unit) |
| Internal / User Memory | Configurable CMOS RAM with battery backup (supports extended user logic storage) |
| Communications | Serial ports + Genius I/O / SNP / SNPX support; interfaces via 90-70 comm modules |
| Backplane | Series 90-70 standard backplane (VME-style bus) |
| Programming Software | Logicmaster 90-70 / VersaPro / Proficy Machine Edition |
| Status | Legacy / discontinued — available through spare-parts and repair channels |
Note: Specifications are compiled from public product documentation and industrial listings. Confirm the exact revision level and firmware compatibility with your existing 90-70 system before ordering.
Product Functions
- High-speed control execution: The 64 MHz processor delivers fast scan times, making it suitable for large ladder-logic and process-control programs.
- Hardware floating-point math: Performs high-precision floating-point calculations without burdening the main scan, ideal for analog, PID, and process-critical applications.
- Manages large I/O networks: Supports Series 90-70 local and remote I/O, as well as Genius distributed I/O over the bus.
- Extensive memory for complex logic: Configurable user memory supports demanding programs with large data tables and structured logic.
- Battery-backed RAM retention: Protects the user program and data during power loss via an internal battery backup.
- Communication & networking: Interfaces with SNP/SNPX, Genius, and Ethernet (via comm modules) for programming, HMI, and supervisory integration.
- Front-panel diagnostics: Status LEDs report CPU state, communication activity, and fault conditions for quick field troubleshooting.
Application Scenarios
- Power generation: Turbine control, boiler management, and plant auxiliary systems requiring fast, reliable logic execution.
- Oil & gas: Pipeline monitoring, compressor control, and refinery process units built on the Series 90-70 platform.
- Water & wastewater treatment: Pump, valve, and process control in large municipal and industrial plants.
- Metals & heavy manufacturing: High-speed control of rolling mills, process lines, and material handling systems.
- Pulp, paper & chemical plants: Continuous-process control demanding floating-point precision and fast scan times.
- Legacy system support: Critical replacement CPU for facilities maintaining existing Series 90-70 installations.
Frequently Asked Questions
What is the IC697CPM790-GD?
It is a 64 MHz Central Processing Unit module for the GE Fanuc Series 90-70 PLC family. It is one of the highest-performance CPUs in the 90-70 line, supporting fast scan times and hardware floating-point math.
What does the "-GD" suffix mean?
It indicates a specific revision/variant of the base IC697CPM790 module. Different suffixes reflect updated hardware revisions — always confirm the suffix matches your existing system or replacement requirement.
Which systems is it compatible with?
It is designed for the GE Fanuc Series 90-70 PLC platform, using the standard 90-70 backplane. It is not compatible with Series 90-30 or PACSystems RX3i racks.
What software is used to program it?
It is programmed with GE's Logicmaster 90-70 (legacy), VersaPro, or Proficy Machine Edition software, depending on your project's vintage and toolset.
Is the IC697CPM790-GD still manufactured?
It is a discontinued legacy product. New old stock, refurbished units, and repair services are generally available through industrial automation spare-parts suppliers. Contact your supplier for current stock and lead time.
What should I check before ordering a replacement?
Verify your existing CPU's revision suffix, firmware level, memory configuration, and rack position. Because the 90-70 platform is sensitive to revision mismatches, matching the exact part number is important for a smooth drop-in replacement.
