GE Fanuc IC693 Series Modules - IC693CPU323

Technical Dossier

Product Details And Specifications

GE Fanuc IC693 Series Technical Notes

The GE Fanuc IC693 Series, commercially designated as the Series 90-30 Programmable Logic Controller, represents one of the most widely deployed mid-range PLC platforms in global heavy industry. Installed across petrochemical complexes, nuclear power generation facilities, offshore oil platforms, and continuous-process refineries, the IC693 architecture established a benchmark for modular, rack-based control systems during its production lifecycle spanning the late 1980s through the 2010s. Its 10-slot and 5-slot baseplate configurations, combined with a deterministic ladder logic execution engine, made it the default selection for process engineers requiring reliable discrete and analog control in Class I hazardous environments. Installed base estimates place active IC693 deployments in the tens of thousands of units globally, with a significant proportion operating beyond their original design service life under extended maintenance contracts.

The Evolution of IC693 Architecture

The IC693 platform was introduced by GE Fanuc Automation (a joint venture between General Electric and FANUC Ltd.) as the successor to the Series Six PLC family. The original IC693 CPU311 and CPU313 modules established the baseline architecture: a VME-derived backplane bus, a proprietary GE Genius I/O network interface, and a 6-MHz 80186-class processor executing relay ladder logic at scan rates of 0.8–1.2 ms per 1,000 boolean instructions.

The mid-generation CPU321, CPU323, and CPU331 modules introduced expanded memory (up to 80 KB user program), floating-point math coprocessors, and support for the SNP/SNP-X serial communication protocol, enabling peer-to-peer PLC networking without a dedicated communications controller. The high-end CPU364 and CPU374 variants added Ethernet TCP/IP connectivity natively, bridging the IC693 platform into the era of plant-wide SCADA integration.

Compatibility constraints are a critical operational consideration. IC693 modules are backplane-compatible within the IC693 rack family but are not electrically or mechanically interchangeable with the IC694 (Series 90-30 enhanced) or IC695 (RX3i) platforms. Firmware versions must be matched to CPU revision levels when replacing modules in existing installations; mismatched firmware can result in I/O configuration faults or communication bus errors. The transition from IC693 to IC695 RX3i required a full rack and wiring replacement, as the RX3i uses a universal backplane with a different bus architecture.

IC693 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC693CPU311: 6 MHz CPU, 6 KB program memory, no floating point, SNP serial port.
• IC693CPU313: 6 MHz CPU, 12 KB program memory, expanded I/O capacity over CPU311.
• IC693CPU321: 80186 CPU, 32 KB memory, floating-point math, SNP/SNP-X dual serial ports.
• IC693CPU323: 80186 Turbo CPU, 80 KB memory, enhanced scan performance, dual serial ports, 10-slot base integration.
• IC693CPU331: High-speed CPU, 80 KB memory, coprocessor support, expanded interrupt handling.
• IC693CPU340: Ethernet-ready CPU, 240 KB memory, TCP/IP stack, SRTP protocol support.
• IC693CPU350: 240 KB memory, dual Ethernet ports, enhanced diagnostics, fault table logging.
• IC693CPU360: 240 KB memory, high-speed boolean execution, advanced motion coordination support.
• IC693CPU364: Embedded Ethernet, 240 KB memory, OPC server capability, SRTP/Modbus TCP.
• IC693CPU374: 512 KB memory, dual Ethernet, highest-performance IC693 CPU, supports C-block programming.

Discrete Input Modules

• IC693MDL230: 8-point 120 VAC discrete input, isolated, standard density.
• IC693MDL240: 16-point 120 VAC discrete input, non-isolated, high-density rack mount.
• IC693MDL241: 16-point 24 VDC discrete input, positive logic, IEC Type 1 compatible.
• IC693MDL260: 32-point 24 VDC discrete input, high-density, dual-slot module.

Discrete Output Modules

• IC693MDL310: 8-point relay output, 2A per point, Form C contacts, 120/240 VAC.
• IC693MDL340: 12-point relay output, mixed voltage, isolated commons per group.
• IC693MDL390: 8-point 120 VAC triac output, zero-crossing switching, 0.5A per point.
• IC693MDL752: 32-point 24 VDC transistor output, positive logic, 0.5A per point, high-density.

Analog I/O Modules

• IC693ALG220: 4-channel analog input, 4–20 mA / 0–10 VDC selectable, 12-bit resolution.
• IC693ALG390: 4-channel analog output, 4–20 mA, 12-bit DAC, loop-powered.
• IC693ALG442: 8-channel analog input, 16-bit resolution, thermocouple/RTD compatible.

Communication & Network Modules

• IC693CMM311: Serial communications module, RS-232/RS-485, Modbus RTU master/slave.
• IC693CMM321: Genius Bus Controller, manages up to 32 Genius I/O blocks on a single bus.
• IC693BEM331: Ethernet interface module, 10BASE-T, SRTP protocol, legacy TCP/IP stack.

Power Supply Modules

• IC693PWR321: 120/240 VAC input power supply, 30W output, standard rack supply.
• IC693PWR330: 24 VDC input power supply, 30W, for DC-powered panel installations.
• IC693PWR331: High-capacity 120/240 VAC supply, 40W, supports fully populated 10-slot racks.

Sourcing Hard-to-Find & Obsolete IC693 Parts

GE Fanuc formally discontinued active production of the IC693 Series 90-30 platform, with end-of-life notices issued progressively from 2012 through 2018 for individual module families. The CPU311, CPU313, and CMM311 were among the earliest to reach end-of-availability status. Despite discontinuation, the installed base remains substantial, and replacement sourcing is a primary operational challenge for plant maintenance teams operating on multi-decade asset lifecycles.

Quality Control for the IC693 Range

The IC693 backplane uses a proprietary parallel bus architecture operating at 8 MHz. Verification of module integrity requires active bus participation testing, not merely power-on self-test (POST) confirmation. DriveKNMS employs a dedicated IC693 test rack configured with a reference CPU364 and calibrated I/O load banks to validate each module type against its original GE Fanuc factory acceptance test criteria.