GE Series 90-70 Modules

Technical Dossier

Product Details And Specifications

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

The GE Fanuc Series 90-70 (also referenced as GE 90-70 or 9070) is a rack-based programmable logic controller platform engineered for large-scale industrial process control. Deployed extensively in chemical processing plants, nuclear power facilities, oil refineries, and continuous manufacturing operations, the Series 90-70 occupies a critical position in global heavy industry automation infrastructure. Its modular backplane architecture supports configurations from single-rack to multi-rack distributed systems, enabling installations that have remained operational for decades. The platform's installed base spans North America, Europe, and Asia-Pacific, with a significant proportion of units still active in facilities where replacement of the control system is cost-prohibitive or operationally disruptive.

The 50P-1228A / 150043581 is a dedicated power supply module within this platform, providing regulated DC power to the Series 90-70 backplane and installed I/O modules. It is a direct-fit replacement component for systems requiring power infrastructure maintenance without full system migration.

The Evolution of Series 90-70 Architecture

The Series 90-70 was introduced by GE Fanuc Automation in the late 1980s as a high-end successor to the Series Six PLC platform. Its VMEbus-derived backplane architecture was a deliberate engineering choice to support high-speed inter-module communication and accommodate the CPU performance requirements of the era. Early CPU modules such as the IC697CPU731 and IC697CPU771 established the platform's processing baseline. Through the 1990s, GE Fanuc expanded the catalog with enhanced CPUs (IC697CPU781, IC697CPU782), redundancy modules, and expanded I/O density options.

The platform's compatibility matrix is a critical operational consideration: early-generation I/O modules (IC697MDL series) are physically and electrically compatible with later backplanes, but firmware-level features introduced in later CPU revisions may not be backward-compatible with first-generation modules. Power supply modules, including the 50P-1228A, are backplane-specific and must be matched to the correct rack form factor. By the 2000s, GE Fanuc (later rebranded as GE Intelligent Platforms, and subsequently acquired by Emerson as part of the Proficy portfolio) positioned the RX3i (IC695 series) as the modern successor architecture. The Series 90-70 entered its end-of-active-production phase, though GE continued to supply spare parts and firmware support for an extended period. As of the mid-2020s, the platform is fully in its end-of-life and long-term maintenance phase, with no new production of original modules.

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

The following catalog covers verified Series 90-70 module part numbers, organized by functional category. Each entry represents a discrete, field-replaceable unit within the platform architecture.

Power Supply Modules

IC697PWR710: 120/240 VAC input power supply, 30W output for standard rack configurations.
IC697PWR711: 120/240 VAC redundant power supply module, hot-standby capable.
IC697PWR724: 24 VDC input power supply module for DC-powered panel installations.
50P-1228A / 150043581: Dedicated power module, direct backplane mount, regulated DC output for I/O rack power distribution.

CPU & Controller Modules

IC697CPU731: Base-tier CPU, 512KB user memory, standard ladder logic execution.
IC697CPU771: Mid-range CPU with expanded memory and floating-point math support.
IC697CPU781: High-performance CPU, 2MB user memory, enhanced instruction set.
IC697CPU782: Dual-port memory CPU supporting peer-to-peer communications.
IC697CPU788: Advanced CPU with integrated Ethernet port and expanded I/O capacity.
IC697CPU789: Top-tier 90-70 CPU, 6MB memory, high-speed scan, redundancy-ready.

Digital Input (DI) Modules

IC697MDL340: 32-point 24 VDC discrete input module, source type.
IC697MDL341: 32-point 24 VDC discrete input module, sink type.
IC697MDL653: 16-point 120 VAC discrete input module, isolated inputs.

Digital Output (DO) Modules

IC697MDL940: 32-point 24 VDC discrete output module, 0.5A per point.
IC697MDL753: 16-point 120 VAC discrete output module, relay contact type.

Analog Input (AI) Modules

IC697ALG230: 16-channel analog input, 4–20 mA / 0–10 VDC selectable, 12-bit resolution.
IC697ALG231: 8-channel analog input, high-resolution 16-bit, thermocouple/RTD compatible.

Analog Output (AO) Modules

IC697ALG320: 8-channel analog output, 4–20 mA, 12-bit resolution, loop-powered.

Communications & Network Adapter Modules

IC697CMM711: Genius Bus Controller, interfaces 90-70 rack to GE Genius I/O field bus network.
IC697CMM742: Ethernet Interface Module, 10BASE-T, SRTP and Modbus TCP protocol support.
IC697BEM711: Remote I/O Scanner module for distributed rack expansion over coaxial bus.

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

The Series 90-70 platform has been in end-of-life status for over a decade. OEM production of modules including the 50P-1228A power supply, IC697CPU series processors, and IC697MDL I/O modules has ceased. Facilities operating this platform face a constrained secondary market where counterfeit and non-tested units represent a documented risk to system integrity.

DriveKNMS maintains a dedicated inventory of tested Series 90-70 spare parts sourced from decommissioned systems, authorized surplus channels, and long-term storage stock. Our procurement team actively tracks global availability of hard-to-find part numbers including obsolete CPU variants, legacy communications modules, and power supply units. For facilities requiring long-term maintenance contracts or bulk spare parts packages for Series 90-70 installations, DriveKNMS provides structured sourcing programs with documented traceability.

Quality Control for the Series 90-70 Range

Series 90-70 modules present specific test challenges due to their VMEbus backplane architecture and the age-related degradation patterns common in long-stored or field-recovered units. DriveKNMS applies a structured inspection and functional test protocol to all Series 90-70 inventory:

Power supply modules (including the 50P-1228A) undergo load-bank testing at rated output current with voltage regulation verification across the full operating temperature range. CPU modules are tested under live backplane conditions with memory read/write cycle verification and watchdog timer function confirmation. I/O modules are tested point-by-point for input threshold accuracy and output switching integrity. Communications modules are verified for bus arbitration function and protocol handshake completion. All modules are inspected for capacitor condition, connector pin integrity, and conformal coating status prior to dispatch.