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Help CenterGE IC697CPM790-GD GMR Redundancy CPU, 486, 2K
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I. Basic Information
Model: IC697CPM790-GD belongs to GE Fanuc Series 90-70 large-scale PLC platform. It is a dedicated main CPU designed for GMR/TMR triple modular redundancy (TMR), a single-slot processor for Series 90-70 racks. Serving as the core controller for ESD emergency shutdown, unit auxiliary control and gas flame detection interlock systems in thermal power, gas turbine and petrochemical industries, it matches triple-redundant rack architecture. As an essential replacement spare part for refurbishment and fault overhaul of legacy generating units, it supports 24/7 uninterrupted in-cabinet operation.
Product Positioning: High-end floating-point main controller for Series 90-70 supporting dual operation modes: simplex and GMR triple redundancy. The module centrally manages local & remote Genius bus I/O, logic execution, closed-loop PID regulation, floating-point process calculation, system fault diagnosis and upper-level network communication. It is the only native CPU of GE Series 90-70 with built-in TMR 2-out-of-3 voting architecture, widely deployed for safety-critical unit control systems.
II. Technical Specifications
(1) Basic Hardware Parameters
Brand: GE Fanuc (GE Vernova / Emerson) | Origin: USA
Type: 32-bit floating-point TMR redundant CPU for Series 90-70, single-slot rack mounting
Compatible System: GE Series 90-70 PLC backplane, compatible with Genius remote I/O, VersaMax remote stations and full-range IC697 I/O modules; supports GMR triple redundant architecture (3-CPU plus 3-set I/O voting configuration). Not compatible with compact RX3i / Series 90-30 PLC platforms.
Mounting: Plug-in installation on standard Series 90-70 backplane slots (preferred for the first slot), occupies one single rack slot
Net Weight: Approx. 0.6～0.82kg; Dimension: 218×291×40mm
Front Panel Configuration: Four LED indicators for Run/Fault/Battery/Communication status, 15Pin Sub-D programming serial port, hardware RUN/STOP toggle switch and backup lithium battery compartment
Backplane Power Supply: Powered by 5VDC from backplane; rated operating current: 2.8A
(2) Core Electrical & Processing Specifications
Processor: Intel 80486DX2, 64MHz clock speed, 32-bit hardware floating-point core with integrated hardware FPU, supporting complex process PID, temperature/pressure/flow computation.
Execution Speed: 0.4μs per Boolean instruction; high-speed scan cycle enables millisecond-level response for unit interlock protection.
Memory Configuration: 1MB lithium-battery-backed RAM; maximum 512KB user program space with remaining storage for register and process data buffering; optional memory expansion up to 8MB.
I/O Addressing Capacity
Simplex Mode: Max. 12,000 discrete DI/DO points, 8,000 analog AI/AO points, capable of multi-rack local I/O plus Genius remote substations.
TMR Triple Redundant Mode: 2,048 voting-type discrete I/O points and 1,024 voting analog points with 2-out-of-3 fault voting output logic.
Communication Interfaces: Onboard 1×15Pin RS485 port (SNP / programming port); optional expansion modules support Genius LAN, ControlNet and TCP/IP Ethernet for connection to HMI and third-party DCS systems.
Power-Fail Data Retention: Detachable onboard lithium battery preserves user programs and process data for minimum 1 year after power loss and sustains real-time calendar clock operation.
(3) Environmental Specifications
Operating Temperature: 0℃～+60℃ for continuous cabinet operation
Storage Temperature: -40℃～+85℃ for warehouse storage and transportation
Humidity: 5%～95% RH non-condensing; compliant with IEC61000 industrial EMC immunity standards against excitation harmonics, dust, oil mist and VFD interference in power plants; certified Class I Div.2 for installation in chemical hazardous-area control cabinets.
III. Key Features
Native TMR (GMR) Triple Modular Redundant Safety ArchitectureThree identical IC697CPM790-GD CPUs installed on three independent racks run synchronous computation with hardware 2-out-of-3 voting on I/O signals. Any single CPU or single I/O channel fault is automatically isolated without system interruption or unit shutdown, specially engineered for ESD emergency shutdown and safety interlock loops.
Hardware Floating-Point Calculation for Complex Process ControlIndependent embedded floating-point processor handles multi-loop PID, calorific value conversion, temperature-pressure compensation and unit efficiency calculation without consuming main logic scan time, ideal for closed-loop speed governing and auxiliary excitation control of gas/steam turbines.
Large-Capacity I/O Expansion & Distributed Network ControlLong-distance remote I/O cabinets are connected via Genius bus; on-site valve islands, pump assemblies and temperature measuring points are deployed dispersedly with centralized logic management by the main CPU, suitable for large-scale distributed auxiliary control across plant facilities.
Full-System Self-Diagnosis for Precise Fault LocalizationReal-time monitoring of backplane, I/O modules, communication links and battery voltage; fault codes are uploaded to upper HMI for quick pinpointing of faulty modules, broken cables and abnormal power supply.
Pin-Compatible Full-Series Drop-In Replacement without Field RewiringSuffix GD denotes production batch; all CPM790 variants share identical pin definition and backplane footprint. Defective legacy CPUs can be directly hot-swapped while retaining original programs and field wiring.
One-Click Simplex / Redundancy Mode SwitchoverMode switching between standalone simplex and triple redundancy is completed via software configuration with no hardware modification, covering both single-cabinet control for new projects and redundant revamping of legacy units.
IV. Working Principle
Program Loading: After power-on, the backup lithium battery restores user application from RAM, followed by CPU initialization of internal hardware, backplane bus and communication ports.
Cyclic Scanning & Calculation: Cyclic acquisition of local and Genius remote I/O data and execution of Ladder Diagram / Structured Text logic as well as floating-point PID algorithms.
TMR Redundancy Voting (Redundant Configuration): Calculation results from three CPUs are cross-synchronized; I/O modules execute 2-out-of-3 voting to generate final outputs for field equipment actuation.
Data Exchange: Control outputs are sent down to DO/AO modules; real-time process data is uploaded to upper HMI via serial or Ethernet ports.
Fault Tolerance: Upon single CPU or single branch failure, redundant architecture automatically excludes the faulty unit; the remaining two channels maintain uninterrupted unit control with fault logs recorded and alarmed on supervision system.
V. Application Scenarios
(1) Main Control & ESD Systems for Thermal / Heavy-Duty Gas Turbines
Deployed on 9F/6FA/5E gas turbines and 300MW/600MW steam turbine units with standard TMR triple redundancy for boiler FSSS furnace safety protection, turbine ETS trip protection and auxiliary equipment ESD emergency shutdown interlock.
(2) Safety Interlock for Petrochemical & Coal-Chemical Plants
SIS safety instrumented systems, flare ignition interlock and tank farm emergency shutdown for refining facilities; redundant safety control under flammable & explosive conditions compliant with Class I Div.2 hazardous area certification.
(3) Retrofit for Waste Heat Generation Units of Steel & Captive Power Plants
Upgrade and replacement of obsolete GE Series 90-70 control systems as core spare for steam turbine governing, generator auxiliary control and water treatment systems.
(4) Aftermarket Maintenance for Global Installed Legacy GE Series 90-70 Projects
Core critical spare for worldwide operational vintage large GE PLC systems and one of the most failure-prone main controller components within Series 90-70 platform.
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