GE Series 90-30 Modules: IC693CBL312 Expansion Cable,

Technical Dossier

Product Details And Specifications

GE Series 90-30: Comprehensive Module Range and Technical Overview

The GE Series 90-30 (IC693 prefix) is one of the most widely deployed programmable logic controller platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, pulp and paper mills, water treatment facilities, and automotive assembly lines, the Series 90-30 established a benchmark for modular, rack-based PLC architecture throughout the 1990s and 2000s. Its distributed I/O capability, deterministic scan cycle, and broad third-party integration support made it the default control platform for mid-scale process automation. Despite GE's transition of the product line to Emerson (following the 2018 divestiture of GE Intelligent Platforms to Emerson Automation Solutions), the installed base remains substantial, and demand for spare parts and replacement modules continues across maintenance-driven procurement cycles.

The Evolution of Series 90-30 Architecture

The Series 90-30 platform was introduced in the early 1990s as a successor to GE's Series Six and Series Five PLC lines. The original CPU modules (IC693CPU311, IC693CPU313) operated on a proprietary backplane bus at fixed scan rates with limited memory. Subsequent CPU generations introduced floating-point math, expanded program memory (up to 240KB), and Ethernet connectivity options. The IC693CPU374 and IC693CPU375 represented the high-end of the native CPU range, supporting SNP, SRTP, and Modbus TCP protocols simultaneously.

Expansion capability was a core design principle from the initial release. The IC693CBL312 expansion cable — a 1-foot (0.3m) rack-to-rack interconnect — enabled engineers to chain up to seven expansion racks (IC693CHS391, IC693CHS392, IC693CHS398) to a single main rack, extending I/O capacity without additional CPUs. This architecture remained backward-compatible across all CPU generations, making the IC693CBL312 a long-lived consumable in the Series 90-30 ecosystem. Later revisions introduced the IC693CBL302 (2-foot) and IC693CBL306 (6-foot) variants to accommodate different panel layouts.

The platform entered its end-of-active-development phase circa 2015, with GE (and subsequently Emerson) maintaining repair and limited spare parts availability. The RX3i (IC695 prefix) platform is the designated modern successor, offering backward software compatibility via Proficy Machine Edition.

Series 90-30 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC693CPU311: Entry-level CPU, 6K program memory, SNP port, fixed scan
• IC693CPU313: Mid-range CPU, 12K memory, dual serial ports, floating point
• IC693CPU321: Enhanced CPU, 32K memory, expanded I/O table support
• IC693CPU331: High-capacity CPU, 80K memory, motion coordination ready
• IC693CPU340: Ethernet-native CPU, 240K memory, SRTP/Modbus TCP
• IC693CPU360: Advanced CPU, 240K memory, high-speed counter support
• IC693CPU374: Top-tier CPU, 240K memory, multi-protocol Ethernet, redundancy-capable

Discrete Input Modules

• IC693MDL230: 8-point 120VAC discrete input module
• IC693MDL240: 16-point 120VAC discrete input module
• IC693MDL241: 16-point 24VDC positive logic discrete input
• IC693MDL632: 32-point 24VDC discrete input, high-density

Discrete Output Modules

• IC693MDL330: 8-point 120VAC relay output module, 2A per point
• IC693MDL340: 16-point 120VAC discrete output module
• IC693MDL741: 16-point 24VDC positive logic discrete output

Analog I/O Modules

• IC693ALG220: 4-channel analog voltage/current input, 12-bit resolution
• IC693ALG390: 4-channel analog output, 0–10V / 4–20mA selectable
• IC693ALG442: 8-channel analog input, high-resolution 15-bit

Communication & Specialty Modules

• IC693CMM311: Communications coprocessor, multi-protocol serial
• IC693CMM321: Ethernet interface module, 10BaseT, SRTP/SNP
• IC693PBS301: PROFIBUS-DP slave adapter, up to 244 bytes I/O

Power Supply Modules

• IC693PWR321: 120/240VAC input power supply, 30W output
• IC693PWR330: 24VDC input power supply, isolated, 30W

Rack & Expansion Hardware

• IC693CHS391: 5-slot expansion rack, Series 90-30
• IC693CHS392: 10-slot expansion rack, Series 90-30
• IC693CBL312: 1-foot rack expansion cable, main-to-expansion rack interconnect
• IC693CBL302: 2-foot rack expansion cable variant
• IC693CBL306: 6-foot rack expansion cable variant

Sourcing Hard-to-Find & Obsolete Series 90-30 Parts

The Series 90-30 platform is classified as mature/end-of-life by Emerson. OEM new stock for many IC693 modules — including the IC693CBL312 — is no longer available through standard distribution channels. DriveKNMS maintains a dedicated inventory of tested surplus, refurbished, and new-surplus Series 90-30 components sourced from decommissioned plant equipment, authorized liquidations, and long-term storage stock.

For facilities operating Series 90-30 systems beyond their planned lifecycle — a common scenario in chemical processing and power generation where control system replacement projects are deferred due to capital constraints — DriveKNMS provides a structured lifecycle extension service. This includes cross-referencing discontinued part numbers to available equivalents, verifying firmware revision compatibility between replacement CPUs and existing I/O modules, and providing documentation packages for maintenance records.

Quality Control for the Series 90-30 Range

Series 90-30 modules present specific test challenges due to their backplane bus architecture and the age profile of available stock. DriveKNMS applies a multi-stage inspection protocol to all IC693-series components prior to shipment.

Each module undergoes visual inspection for capacitor condition, connector pin integrity, and PCB corrosion — failure modes common in modules recovered from humid or chemically aggressive environments. Functional testing is performed in a live Series 90-30 rack using a reference CPU at the appropriate firmware revision. For expansion cables such as the IC693CBL312, continuity and impedance testing is performed across all conductors, and the cable is exercised through repeated insertion cycles to verify connector retention force. CPU modules are tested for full program load, I/O table scan, and communication port response. Analog modules are calibrated against a traceable reference standard and verified across the full input/output range. All tested units are assigned a test record number and shipped with a condition report.

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.