GE Series 90-30 IC694 Modules – IC694ALG392A Analog Output

Technical Dossier

Product Details And Specifications

GE Series 90-30 (IC694) PLC Technical Notes

The GE Series 90-30, identified by the IC694 prefix, is one of the most widely deployed programmable logic controller platforms in global heavy industry. Installed across petrochemical refineries, nuclear power auxiliary systems, offshore platforms, pulp and paper mills, and continuous-process chemical plants, the Series 90-30 rack-based architecture established a benchmark for modular mid-range PLC design throughout the 1990s and 2000s. Its five-slot, ten-slot, and expansion rack configurations support mixed I/O densities that remain operationally active in thousands of facilities worldwide. The platform's longevity has created a sustained demand for replacement modules, particularly as OEM support transitions to lifecycle management status.

The Evolution of Series 90-30 (IC694) 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 families. The original architecture used a proprietary backplane bus operating at 8 MHz, supporting up to 10 modules per rack and up to 8 expansion racks via the IC694CBL series cables. Early CPU modules (IC693CPU311, IC693CPU313) were later superseded by the IC694 generation, which introduced enhanced memory capacity, Ethernet-native options, and expanded analog resolution.

The transition from IC693 to IC694 prefix modules marked a significant architectural revision: IC694 modules introduced 12-bit and 16-bit analog resolution options, expanded the discrete I/O point count per module, and added support for the Ethernet Global Data (EGD) protocol natively on select CPUs. Compatibility between IC693 and IC694 modules within the same rack is partial — power supplies and most discrete I/O modules are cross-compatible, while CPU and some specialty modules are not interchangeable without firmware validation. As of 2026, the Series 90-30 platform is in the mature/end-of-life phase. GE Vernova (formerly GE Digital / Emerson) has transitioned primary support to the RX3i (IC695) platform. Long-term maintenance of Series 90-30 installations now depends on third-party spare parts suppliers and refurbished module inventories.

Series 90-30 IC694 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC694CPU310: 6K-word user memory CPU, RS-232 serial port, no Ethernet
• IC694CPU311: 12K-word CPU, dual serial ports, ladder/function block support
• IC694CPU323: 64K-word CPU, floating-point math, expanded I/O table
• IC694CPU364: Embedded Ethernet CPU, 240K-word memory, EGD protocol support
• IC694CPU374: High-performance CPU, 512K-word memory, dual Ethernet ports

Analog Input (AI) Modules

• IC694ALG220: 4-channel analog input, 0–10 VDC / 4–20 mA, 12-bit resolution
• IC694ALG221: 4-channel analog input, current/voltage selectable per channel
• IC694ALG222: 8-channel analog input, 12-bit, single-ended configuration
• IC694ALG223: 16-channel analog input, high-density, 12-bit resolution
• IC694ALG442: 4-channel analog input, 16-bit resolution, differential inputs

Analog Output (AO) Modules

• IC694ALG390: 2-channel analog output, voltage/current, 12-bit resolution
• IC694ALG391: 4-channel analog output, 0–10 VDC or 4–20 mA, 12-bit
• IC694ALG392A: 4-channel analog output, 16-bit resolution, enhanced linearity, supports ±10 VDC and 0–20 mA ranges — the subject module of this listing
• IC694ALG442: Combination 4-in/2-out analog module, 16-bit, mixed signal

Discrete Input (DI) Modules

• IC694MDL230: 8-point 120 VAC discrete input module
• IC694MDL240: 16-point 120 VAC discrete input, grouped commons
• IC694MDL632: 16-point 24 VDC positive/negative logic input
• IC694MDL660: 32-point 24 VDC discrete input, high-density

Discrete Output (DO) Modules

• IC694MDL330: 8-point relay output, 2A per point, isolated contacts
• IC694MDL740: 16-point 12/24 VDC transistor output, sourcing
• IC694MDL742: 16-point 12/24 VDC transistor output, sinking
• IC694MDL752: 32-point 24 VDC transistor output, high-density

Communication & Specialty Modules

• IC694CMM302: Serial communications module, RS-232/RS-485, Modbus RTU/ASCII
• IC694CMM321: Ethernet interface module, 10/100 Mbps, EGD and SRTP support
• IC694PBS301: PROFIBUS-DP slave adapter, 12 Mbps, GSD file configurable

Sourcing Hard-to-Find & Obsolete IC694 Parts

For obsolete or allocation-constrained part numbers — including IC694CPU310, IC694ALG223, IC694CMM302, and IC694PBS301 — DriveKNMS provides direct sourcing support with documented traceability. All modules are inspected against original GE hardware revision specifications prior to dispatch. Customers operating Series 90-30 systems beyond OEM support windows can engage DriveKNMS for multi-year spare parts agreements covering critical CPU, power supply, and I/O module categories.

Quality Control for the IC694 Range

Series 90-30 modules present specific test challenges due to their backplane-dependent communication architecture. Each IC694 module communicates with the CPU via a proprietary parallel bus; functional verification requires rack-level integration testing, not standalone bench testing. DriveKNMS operates a dedicated Series 90-30 test rack environment replicating standard 10-slot IC694 configurations.

Test procedures for IC694ALG392A and other analog modules include: full-scale output calibration across all four channels at 0%, 25%, 50%, 75%, and 100% of rated range; linearity error measurement against 16-bit resolution specification; load impedance variation testing at 250Ω, 500Ω, and 1kΩ; and thermal stability verification across 0–60°C operating range. Discrete I/O modules undergo point-by-point continuity, isolation resistance, and switching cycle tests. CPU modules are validated for program load/store integrity, serial port communication, and memory retention under power-cycle conditions.