GE IC697CPM790-GD High Performance TMR/GMR Redundant CPU Module

Product Description

GE IC697CPM790-GD is the flagship triple modular redundant (TMR/GMR) main CPU of GE Fanuc Series 90-70 platform, designed for zero-downtime and high-safety critical processes such as ESD emergency shutdown, gas flame safety, and power unit protection.

Equipped with a 64MHz Motorola 80486DX2 processor with integrated hardware FPU, it executes complex control algorithms including ladder logic, structured text and function blocks. It comes with 1MB battery-backed RAM, with 512KB allocated for user programs and process data to retain recipes, fault logs and PID parameters after power loss.

It is a single-slot rack plug-in module with native support for Genius modular triple redundancy architecture. Hardware voting among three rack CPUs provides fault tolerance without process trips upon single CPU failure. It features an onboard DB15 RS422/485 serial debug port for online firmware upgrade without EPROM replacement. The front panel has four status LEDs plus a physical RUN/STOP/MEM PROTECT three-position switch to lock programs against unauthorized modification.

Suffix GD stands for conformal coated industrial version, suitable for cabinets with high humidity, dust and heavy electromagnetic interference. It serves as a core replacement spare for legacy redundant Series 90-70 automation systems.

Technical Specifications

PN: IC697CPM790-GD, Manufacturer: GE Fanuc USA

Core Processor: 64MHz Motorola 80486DX2 with FPU floating point coprocessor

Execution Speed: 0.4μs per boolean logic instruction

Memory: 1MB battery-backed CMOS RAM (512KB for user program/data), onboard Flash for OS firmware

Max I/O Capacity (Single Mode):

Discrete I/O: 12,000 mixed DI/DO

Analog I/O: 8,000 mixed AI/AO

TMR Redundancy Mode: 2048 voting DI + 2048 voting DO, 1024 voting AI

Communication: 1×DB15 RS422/485 serial port, supports SNP, Modbus RTU for programming

Redundancy: Native GMR/TMR triple modular redundant architecture, <1ms bumpless switchover

Front Panel Controls: 3-position RUN/STOP/MEM PROTECT switch, 4 status LEDs (OK/RUN/DIAG/MEM)

Rack Power: 5VDC backplane supply

Cooling Requirement: Forced air cooling required when ambient temperature exceeds 40℃

Operating Temp: 0℃ ~ +60℃; Storage Temp: -40℃ ~ +85℃

Humidity: 5%–95% non-condensing, conformal coated PCB (GD version)

Form Factor: Single-slot Series 90-70 rack module

Weight: ~0.6kg

Programming Software: Proficy Machine Edition, Logicmaster 90-70

Key Features

TMR triple hardware voting fault-tolerant architecture, automatically isolates single CPU/I/O channel faults with millisecond bumpless switchover to avoid safety system trips.

Built-in hardware floating-point unit supports precise complex control such as advanced PID, S88 batch control, dynamic flow ratio and cascade temperature regulation.

Large 1MB battery-backed memory permanently stores batch recipes, SOE fault records and equipment operating parameters through power outages.

Online firmware update via serial port, eliminating the need to disassemble the unit for storage chip replacement and greatly shortening maintenance downtime.

Physical memory protection switch locks control programs on-site to prevent accidental deletion or unauthorized modification.

Comprehensive hardware self-diagnosis monitors CPU core, memory, backplane bus and communication links for real-time fault alert and localization.

GD conformal coated PCB resists salt spray, heavy dust and high humidity in harsh chemical and power plant cabinet environments.

Fully compatible with all Series 90-70 I/O modules, Genius bus and remote distributed I/O racks with no cabinet modification required for direct replacement.

Application Scope

Redundant main CPU for ESD emergency shutdown safety systems in petrochemical refineries and chemical plants

Burner Management System (BMS) protection controller for gas and steam turbine boilers in thermal power plants

High-reliability TMR safety control rack core for LNG terminals and offshore oil & gas platforms

FGS fire and gas detection interlock PLC main module for pharmaceutical hazardous material workshops and storage tank areas

Uninterrupted production redundant automation systems for metallurgy and cement kiln critical equipment

Overhaul spare inventory and technical upgrade for aging GE Series 90-70 GMR redundant systems worldwide