GE IC694 Series Modules: IC694ALG391A Analog Output Module

Technical Dossier

Product Details And Specifications

GE IC694 Series Technical Notes

The GE Fanuc Series 90-30 (IC694 / IC693 platform) is one of the most widely deployed programmable logic controller families in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore platforms, pulp and paper mills, and municipal water treatment facilities, the IC694 rack-based architecture established a benchmark for modular, scalable industrial control in the 1990s and 2000s. The IC694ALG391A is a 4-channel analog output module within this platform, providing 0–10 VDC or 4–20 mA configurable outputs for process control loops requiring precision signal conditioning.

Despite the Series 90-30 platform entering its mature/end-of-active-production phase, installed base volumes across critical infrastructure ensure sustained demand for spare parts, replacement modules, and lifecycle extension services well into the 2030s.

The Evolution of IC694 Architecture

The Series 90-30 platform originated as the IC693 family in the late 1980s, designed around a 5-slot to 10-slot backplane with a proprietary serial bus. The IC694 designation introduced enhanced backplane communication speeds, expanded I/O addressing, and compatibility with the Logicmaster 90 and later Proficy Machine Edition programming environments. Key architectural milestones include:

• IC693 (Gen 1): Original 5/10-slot chassis, 16-bit CPU architecture, limited analog resolution.
• IC694 (Gen 2): Revised backplane bus, improved analog module resolution (12-bit standard, 16-bit on select modules), expanded network adapter support (Ethernet, Genius, Profibus).
• RX3i (IC695) Transition: GE introduced the PACSystems RX3i as the forward-compatible successor. IC694 modules are not directly interchangeable with IC695 racks without adapter hardware, creating a long-term demand for original IC694 spares in legacy installations.

Compatibility note: IC693 and IC694 I/O modules are generally cross-compatible at the rack slot level, but CPU modules and power supplies are generation-specific. Always verify firmware revision before substitution.

IC694 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC694CPU310: Series 90-30 CPU, 6K logic/1K I/O, no Ethernet, base controller for small applications.
• IC694CPU311: Enhanced CPU, 12K logic, expanded data memory, supports floating point math.
• IC694CPU323: High-capacity CPU, 240K logic, 32K I/O, supports motion and advanced PID.
• IC694CPU364: Embedded Ethernet CPU, 240K logic, 10/100 Mbps port, Modbus TCP native.
• IC694CPU374: Top-tier CPU with dual Ethernet ports, 240K logic, redundancy-ready architecture.

Analog Input Modules

• IC694ALG220: 4-channel analog input, voltage/current configurable, 12-bit resolution.
• IC694ALG221: 4-channel analog input, 4–20 mA dedicated, isolated channels.
• IC694ALG222: 16-channel analog input, high-density, 12-bit, single-ended.
• IC694ALG223: 8-channel analog input, differential, 16-bit resolution, high accuracy.
• IC694ALG232: 4-channel thermocouple/mV input, cold junction compensation, types J/K/T/E/R/S/B.

Analog Output Modules

• IC694ALG390: 2-channel analog output, voltage/current, 12-bit resolution.
• IC694ALG391A: 4-channel analog output, 0–10 VDC / 4–20 mA configurable, 12-bit, isolated outputs.
• IC694ALG392: 8-channel analog output, high-density, 12-bit, current output.

Digital Input / Output Modules

• IC694MDL340: 32-point 24 VDC discrete input module, sink/source configurable.
• IC694MDL645: 32-point 24 VDC discrete output module, 0.5A per point, sourcing.
• IC694MDL740: 16-point relay output module, Form C contacts, 2A per point, 120/240 VAC.
• IC694MDL241: 16-point 120 VAC discrete input module, isolated groups.

Communication & Network Adapters

• IC694CMM321: Serial communications module, RS-232/RS-485, Modbus RTU/ASCII master-slave.
• IC694CMM302: Ethernet interface module, 10 Mbps, SRTP and Modbus TCP.
• IC694PBS301: Profibus-DP slave adapter, up to 244 bytes I/O, GSD file configurable.

Power Supply Modules

• IC694PWR321: 120/240 VAC input power supply, 30W output, standard rack supply.
• IC694PWR330: 24 VDC input power supply, 30W, for DC-powered panel installations.

Sourcing Hard-to-Find & Obsolete IC694 Parts

All sourced IC694 modules are traceable to documented supply chains. Counterfeit risk mitigation is a standard part of our procurement protocol for this platform.

Quality Control for the IC694 Range

IC694 modules present specific test challenges due to their backplane bus communication architecture and mixed analog/digital signal paths. DriveKNMS applies the following verification procedures:

• Backplane Bus Integrity Test: Each module is seated in a live IC694 rack and polled via Logicmaster 90 or Proficy ME to confirm slot recognition and I/O table mapping.
• Analog Channel Calibration: For analog modules (including IC694ALG391A), each output channel is verified against a calibrated reference meter across the full output range (0–10 V and 4–20 mA). Linearity error must be within ±0.1% of full scale.
• Thermal Soak: Modules are operated at rated load for a minimum of 2 hours to screen for latent component failures.
• Firmware Revision Logging: CPU modules are documented by firmware version to ensure compatibility with target application software.
• Visual and Physical Inspection: Connector pins, backplane edge connectors, and field wiring terminals are inspected for corrosion, mechanical damage, and counterfeit indicators.