GE Series 90-30 IC693 Modules – IC693ALG391

Technical Dossier

Product Details And Specifications

GE Series 90-30 (IC693) Series: Comprehensive Module Range and Technical Overview

The GE Series 90-30 PLC platform, identified by the IC693 catalog prefix, is one of the most widely deployed programmable logic controller families in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, pulp and paper mills, water treatment facilities, and continuous process manufacturing plants, the Series 90-30 established a benchmark for mid-range DCS/PLC integration during its commercial peak from the early 1990s through the 2010s. Its modular rack-based architecture, deterministic scan cycle, and broad I/O density made it the default selection for engineers specifying control systems requiring long service life and high channel counts. DriveKNMS maintains an active spare parts inventory for the full IC693 catalog, including discontinued and long-lead-time modules.

The Evolution of IC693 Architecture

The Series 90-30 was introduced by GE Fanuc Automation in the early 1990s as a successor to the Series Six and Series Five PLC lines. The platform was designed around a passive backplane bus architecture supporting up to 10 modules per rack, with multi-rack expansion via the IC693CHS chassis family. The CPU module communicates with I/O modules over a proprietary parallel backplane bus, with scan times configurable from sub-millisecond to multi-second depending on I/O count and logic complexity.

Early CPU variants such as the IC693CPU311 and IC693CPU313 offered limited memory and no embedded communications. Subsequent generations introduced the IC693CPU340, IC693CPU350, and IC693CPU364, progressively adding Ethernet, expanded program memory (up to 240KB), and support for structured text and function block programming under the IEC 61131-3 standard. The final production CPUs — IC693CPU374 and IC693CPU375 — incorporated embedded 10/100 Ethernet and supported SRTP, Modbus TCP, and EGD (Ethernet Global Data) protocols natively.

GE Intelligent Platforms (later rebranded as GE Automation & Controls, then acquired by Emerson as part of the Proficy portfolio) formally announced end-of-life for new IC693 hardware production. Existing installed bases are supported through third-party spare parts suppliers and authorized repair centers. Migration paths include the GE RX3i (IC695) platform, which offers backward-compatible I/O modules and a common programming environment via Proficy Machine Edition.

IC693 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the IC693 Series 90-30 platform. Each entry reflects the module's primary functional classification and channel specification.

CPU & Controller Modules

• IC693CPU311: Base CPU, 6KB program memory, no comms port
• IC693CPU313: CPU, 12KB memory, 1x RS-232 serial port
• IC693CPU340: CPU, 240KB memory, 1x RS-232, 1x RS-485
• IC693CPU350: CPU, 240KB memory, embedded Ethernet 10BaseT
• IC693CPU360: CPU, 240KB memory, dual serial ports, no Ethernet
• IC693CPU364: CPU, 240KB memory, embedded 10/100 Ethernet, SRTP
• IC693CPU374: CPU, 240KB memory, embedded Ethernet, EGD, Modbus TCP

Analog I/O Modules

• IC693ALG391: Analog combo module, 4 inputs / 2 outputs, ±10V or 4–20mA, 12-bit resolution — the subject of this listing
• IC693ALG220: Analog input, 4-channel, voltage/current, 12-bit
• IC693ALG221: Analog input, 8-channel, voltage/current, 12-bit
• IC693ALG222: Analog input, 16-channel, voltage/current, 12-bit
• IC693ALG390: Analog combo, 4AI/2AO, current output only, 12-bit
• IC693ALG442: Analog output, 4-channel, voltage/current, 12-bit
• IC693ALG444: Analog output, 8-channel, voltage/current, 12-bit

Digital I/O Modules

• IC693MDL340: Digital input, 8-point, 120VAC isolated
• IC693MDL645: Digital input, 16-point, 24VDC positive logic
• IC693MDL654: Digital input, 32-point, 24VDC positive logic
• IC693MDL740: Digital output, 8-point, 120VAC relay
• IC693MDL753: Digital output, 16-point, 24VDC positive logic
• IC693MDL916: Digital combo, 8DI/8DO, 24VDC

Communications & Specialty Modules

• IC693CMM311: Communications coprocessor, RS-232/RS-485, RTU/ASCII
• IC693CMM321: Ethernet interface module, 10BaseT, SRTP/Modbus TCP
• IC693PBS301: PROFIBUS-DP slave adapter, 12Mbps
• IC693BEM331: Genius Bus Controller, supports up to 32 Genius devices

Power Supply Modules

• IC693PWR321: Power supply, 120/240VAC input, 30W output, standard rack
• IC693PWR322: Power supply, 24VDC input, 30W output
• IC693PWR330: High-capacity power supply, 120/240VAC, 40W

Sourcing Hard-to-Find & Obsolete IC693 Parts

The IC693 platform has entered the obsolescence phase of its product lifecycle. GE Automation & Controls (Emerson) no longer manufactures new IC693 hardware, and authorized distributor stock is depleted for the majority of catalog numbers. Lead times through legacy channels can exceed 26 weeks for certain CPU and analog modules.

DriveKNMS operates a dedicated obsolete parts sourcing program for the IC693 series. Our inventory is sourced from decommissioned plant equipment, verified surplus stock, and controlled repair-and-return programs. All modules are cataloged by part number, firmware revision where applicable, and physical condition grade. For end-users operating Series 90-30 systems beyond their original design life, DriveKNMS provides:

• Direct replacement modules for discontinued SKUs including IC693ALG391, IC693CPU364, and IC693CMM311
• Cross-reference support for identifying functional equivalents within the IC695 (RX3i) platform
• Long-term supply agreements for facilities with multi-year maintenance contracts
• Emergency same-day dispatch for critical process shutdowns

Quality Control for the IC693 Range

The IC693 backplane bus architecture presents specific challenges for incoming inspection of used or refurbished modules. DriveKNMS applies a structured test protocol to all IC693 inventory prior to shipment:

• Backplane bus integrity check: Each module is seated in a live IC693 rack and scanned for correct bus communication handshake. Modules that fail to enumerate on the backplane are rejected.
• Analog channel calibration verification: For modules such as the IC693ALG391, all input and output channels are exercised across the full engineering range (0–20mA, ±10V) using calibrated signal sources. Channel-to-channel isolation is verified.
• CPU memory and I/O scan test: CPU modules are loaded with a standardized ladder logic program and run for a minimum burn-in period. Program memory retention across power cycles is confirmed.
• Visual and component inspection: PCB surfaces are inspected for corrosion, capacitor bulge, and solder joint integrity. Conformal coating condition is assessed for modules from high-humidity environments.
• Firmware revision logging: Where readable, firmware version is recorded and disclosed to the buyer prior to shipment.