GE Series 90-70 (IC697) Modules – IC697CPX935

Technical Dossier

Product Details And Specifications

GE Fanuc Series 90-70 (IC697) Series: Comprehensive Module Range and Technical Overview

The GE Fanuc Series 90-70, identified by the IC697 part number prefix, is one of the most widely deployed programmable logic controller (PLC) platforms in global heavy industry. Since its commercial introduction in the late 1980s, the Series 90-70 has accumulated a substantial installed base across petrochemical refineries, nuclear power facilities, pulp and paper mills, automotive assembly lines, and municipal water treatment infrastructure. Its VMEbus-based backplane architecture, combined with a broad I/O module library, made it the platform of choice for large-scale discrete and process control applications throughout the 1990s and into the 2000s.

The IC697CPX935 is a coprocessor module within this platform, designed to offload computational tasks from the primary CPU and extend the processing capacity of complex control programs. Its continued presence in operating facilities underscores the long service life of the Series 90-70 architecture — and the ongoing demand for verified spare parts to sustain those systems.

GE has formally transitioned the Series 90-70 to end-of-life status, with hardware manufacturing discontinued. Replacement parts are no longer available through standard distribution channels. For facilities that cannot justify a full control system migration — a project that routinely costs between USD 500,000 and several million dollars depending on system scale — sourcing verified spare modules from specialist suppliers is the only operationally viable path.

The Evolution of Series 90-70 Architecture

The Series 90-70 was engineered around the VME (Versa Module Eurocard) bus standard, a 32-bit parallel backplane architecture that provided high-speed data transfer between CPU and I/O modules. This design decision gave the platform exceptional throughput for its era and allowed third-party module integration — a capability that extended its adoption across diverse OEM applications.

Early Generation (IC697 Rev A/B, late 1980s – mid 1990s): Initial releases focused on discrete I/O and basic analog processing. CPU modules such as the IC697CPU731 and IC697CPU771 established the programming model using GE's Logicmaster 90 software environment. Backplane configurations supported up to 9 slots per rack, with multi-rack expansion via the IC697BEM711 bus expansion module.

Mid Generation (IC697 Rev C/D, mid 1990s – early 2000s): This phase introduced enhanced CPU modules (IC697CPU781, IC697CPU788) with expanded memory and faster scan times. Ethernet and Genius bus communication adapters were added to the catalog, enabling integration with SCADA systems and distributed I/O networks. The IC697CMM711 and IC697CMM742 communication modules became standard components in networked installations.

Late Generation / Transition Phase (2000s – 2015): GE introduced the PACSystems RX7i as the architectural successor to the Series 90-70. The RX7i maintained backward compatibility with IC697 I/O modules through a VME-compatible backplane, providing a migration path that preserved existing I/O wiring infrastructure. However, CPU and communication modules are not interchangeable between platforms. Many facilities elected to retain Series 90-70 hardware rather than undertake partial migrations, creating the sustained demand for IC697 spare parts that persists today.

End-of-Life Declaration: GE Fanuc (subsequently Emerson Automation Solutions under the Movicon/PACEdge portfolio) formally discontinued Series 90-70 hardware production. Software support for Logicmaster 90 and early versions of Machine Edition has also been curtailed, creating additional maintenance complexity for facilities running legacy program archives.

Series 90-70 Full Catalog & Functionalities (SKU List)

The following represents a structured reference catalog of verified IC697 series modules, organized by functional category. All models listed are confirmed Series 90-70 components.

CPU & Coprocessor Modules

• IC697CPU731: Series 90-70 CPU, 512KB user memory, Logicmaster 90 compatible
• IC697CPU771: Enhanced CPU, 1MB memory, floating point math support
• IC697CPU781: High-performance CPU, 2MB memory, faster scan cycle
• IC697CPU788: Advanced CPU module with expanded I/O table and memory
• IC697CPU789: Top-tier Series 90-70 CPU, 6MB memory, high-speed processing
• IC697CPX935: Coprocessor module for offloading computational tasks from primary CPU; extends program execution capacity in complex multi-loop control applications

Discrete Input Modules

• IC697MDL340: 120VAC discrete input, 16-point, isolated groups
• IC697MDL341: 120VAC discrete input, 32-point
• IC697MDL653: 24VDC discrete input, 32-point, positive logic
• IC697MDL654: 24VDC discrete input, 32-point, negative logic

Discrete Output Modules

• IC697MDL940: 120VAC discrete output, 16-point, relay contact
• IC697MDL753: 24VDC discrete output, 32-point, positive logic
• IC697MDL754: 24VDC discrete output, 32-point, negative logic

Analog I/O Modules

• IC697ALG320: Analog input, 16-channel, voltage/current configurable
• IC697ALG321: Analog input, 16-channel, high-resolution
• IC697ALG440: Analog output, 8-channel, 12-bit resolution

Communication & Network Modules

• IC697CMM711: Serial communications module, RS-232/RS-422/RS-485
• IC697CMM742: Ethernet interface module, 10BaseT, TCP/IP
• IC697BEM711: Bus expansion module, rack-to-rack communication
• IC697BEM713: Remote I/O bus expansion transmitter

Power Supply Modules

• IC697PWR710: 120/240VAC power supply, standard capacity
• IC697PWR711: 120/240VAC power supply, high-capacity, redundancy-ready
• IC697PWR724: 24VDC input power supply for DC-powered rack configurations

Sourcing Hard-to-Find & Obsolete Series 90-70 Parts

With GE's formal end-of-life declaration for the IC697 platform, procurement of replacement modules through authorized distribution is no longer possible. The secondary market — comprising specialist industrial parts suppliers, decommissioned equipment brokers, and MRO inventory holders — is the primary source for facilities requiring spare modules.

DriveKNMS maintains a dedicated inventory of Series 90-70 modules sourced through controlled acquisition channels. Our procurement process prioritizes modules from decommissioned systems with documented service histories, factory-sealed new-old-stock where available, and tested surplus from verified industrial sources.

For facilities managing multi-year maintenance contracts or planning strategic spare parts reserves, DriveKNMS offers bulk sourcing consultation. Identifying and securing critical spare modules — particularly CPU boards, coprocessors such as the IC697CPX935, and communication adapters — before they become unavailable on the secondary market is a measurable risk mitigation strategy. The cost of a verified spare module is a fraction of the downtime cost associated with an unplanned CPU failure on a production-critical system.

Common sourcing scenarios handled by DriveKNMS include: emergency single-unit replacement for unplanned failures; multi-unit reserve procurement for facilities with 3–5 year maintenance horizons; and full rack assembly sourcing for facilities commissioning a parallel backup system prior to a planned migration.

Quality Control for the Series 90-70 Range

The Series 90-70 backplane uses a VMEbus parallel architecture with direct electrical contact between module edge connectors and the backplane bus. Modules that have been in service for 15–25 years present specific failure modes that require targeted inspection protocols before being offered as replacement parts.

DriveKNMS applies the following inspection sequence to all IC697 series modules:

1. Visual and mechanical inspection: Edge connector pin condition, PCB surface examination for corrosion, burn marks, or physical damage. Backplane connector alignment verification.
2. Electrolytic capacitor assessment: Identification and evaluation of electrolytic capacitors on the power regulation circuits. Capacitors with visible bulging, electrolyte leakage, or measured capacitance deviation beyond tolerance are flagged for replacement before the module is offered for sale.
3. Firmware version verification: Where applicable, CPU and communication modules are checked for firmware revision level. Compatibility between firmware versions and the target system's software environment (Logicmaster 90 or Machine Edition) is confirmed.
4. Functional bench test: Modules are powered in a controlled test rack and subjected to functional verification against GE's published I/O specifications. Communication modules are tested for protocol handshake and data integrity.
5. Final documentation: Each module is assigned a condition grade (New Old Stock, Tested Surplus, or Refurbished) with a corresponding inspection record. This documentation is provided to the customer upon request.

For Series 90-70 module availability, bulk sourcing inquiries, or technical compatibility questions: