GE IC693 Series Modules: IC693CPU311

Technical Dossier

Product Details And Specifications

GE IC693 Series: Comprehensive Module Range and Technical Overview

The GE IC693 Series — commercially designated as the Series 90-30 PLC — 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 IC693 rack-based architecture established a benchmark for modular mid-range automation from its introduction in the late 1980s through the 2010s. Its 5-slot, 10-slot, and expansion rack configurations support mixed analog/digital I/O, high-speed counter modules, motion control interfaces, and multi-protocol communications — making it a standard reference platform for distributed control system (DCS) integration in brownfield facilities worldwide.

The Evolution of IC693 Architecture

The IC693 platform was introduced by GE Fanuc Automation (later rebranded GE Intelligent Platforms, then GE Automation & Controls) as the successor to the Series Six and Series Five PLC lines. The original IC693 backplane used a proprietary parallel bus architecture operating at 5 VDC logic levels, with CPU modules communicating to I/O over a dedicated backplane bus distinct from the serial SNP/SNPX programming port.

Early CPU generations — including the IC693CPU311, IC693CPU313, and IC693CPU321 — used mask-programmed ROM for firmware and supported ladder logic exclusively via the Logicmaster 90-30 programming software running on DOS. The mid-generation transition introduced the IC693CPU340 and IC693CPU350 with expanded memory, floating-point math coprocessors, and compatibility with the Windows-based Proficy Machine Edition (ME) programming environment. The final generation — IC693CPU364 and IC693CPU374 — added Ethernet TCP/IP embedded ports, enabling direct integration with SCADA systems without a dedicated Ethernet Interface Module (EIM).

Compatibility across generations is constrained by firmware revision and rack type. IC693 CPU modules are not interchangeable with IC694 (Series 90-30 enhanced) or IC695 (RX3i) modules without rack and power supply replacement. Backplane bus pinouts differ between IC693 and IC694 series despite physical similarity. Engineers performing lifecycle upgrades must verify rack model, power supply rating, and I/O module firmware compatibility before substitution.

IC693 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC693CPU311: 6K word user memory CPU, Series 90-30 base controller, SNP port, ladder logic only
• IC693CPU313: 12K word user memory CPU, expanded register table, SNP/SNPX dual port
• IC693CPU321: 32K word CPU, floating-point support, Logicmaster 90-30 compatible
• IC693CPU331: 32K word CPU with enhanced instruction set, coprocessor-ready
• IC693CPU340: 240K word CPU, Proficy ME compatible, high-speed interrupt tasks
• IC693CPU350: 240K word CPU, motion control coordination, structured text support
• IC693CPU360: 240K word CPU, embedded Ethernet 10BaseT, dual SNP ports
• IC693CPU364: 512K word CPU, embedded 10/100 Ethernet, SRTP protocol, web server
• IC693CPU374: 512K word CPU, redundancy-ready, hot-standby failover support

Digital Input Modules

• IC693MDL230: 8-point 120 VAC discrete input, isolated, DIN rail compatible
• IC693MDL240: 16-point 120 VAC discrete input, group isolated, standard rack mount
• IC693MDL241: 16-point 24 VDC positive logic discrete input, fast response
• IC693MDL260: 32-point 24 VDC discrete input, high-density, dual-slot module

Digital Output Modules

• IC693MDL310: 8-point relay output, 2A per point, Form C contacts, 120/240 VAC
• IC693MDL340: 16-point 120 VAC triac output, isolated, zero-crossing switching
• IC693MDL741: 16-point 24 VDC transistor output, positive logic, 0.5A per point

Analog Modules

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

Communications & Network Modules

• IC693CMM301: Serial communications module, RS-232/RS-485, ASCII/RTU Modbus master
• IC693CMM302: Genius Bus Controller, peer-to-peer I/O bus, up to 32 devices
• IC693CMM311: Ethernet Interface Module (EIM), 10BaseT, SRTP/Modbus TCP

Power Supply Modules

• IC693PWR321: 120/240 VAC input power supply, 30W output, standard 5-slot rack
• IC693PWR330: 120/240 VAC input, 40W, supports 10-slot rack with full I/O load
• IC693PWR331: 24 VDC input power supply, 40W, for DC-powered panel installations

Sourcing Hard-to-Find & Obsolete IC693 Parts

GE Automation formally discontinued active manufacturing of the IC693 Series 90-30 product line. Replacement parts, factory repair services, and new-build modules are no longer available through standard distribution channels. The platform has entered full end-of-life status, with GE recommending migration to the IC695 RX3i architecture.

DriveKNMS maintains a dedicated inventory of IC693 Series modules sourced from decommissioned plant equipment, controlled factory surplus, and verified secondary market channels. All units are catalogued by part number, firmware revision, and hardware revision level. For facilities operating IC693-based systems under long-term maintenance contracts — particularly in nuclear auxiliary, refinery DCS, and water treatment SCADA applications — DriveKNMS provides lifecycle extension support including cross-reference to compatible substitute modules, firmware version matching, and batch procurement for multi-year maintenance schedules.

Customers requiring specific hardware revision levels (e.g., IC693CPU311 Rev F vs Rev K) for validated system configurations should specify revision requirements at time of inquiry. DriveKNMS documents hardware revision on all shipped units.

Quality Control for the IC693 Range

IC693 modules present specific test challenges due to their backplane bus architecture and mixed-voltage logic design. DriveKNMS applies the following verification procedures to all IC693 inventory:

• Backplane Bus Integrity Test: Each module is seated in a live IC693 5-slot or 10-slot test rack and verified for correct bus arbitration, address decoding, and power rail draw within GE-specified tolerances.
• CPU Functional Verification: CPU modules (IC693CPU311 and equivalents) are loaded with a standardized ladder logic test program via SNP port. Program execution, I/O scan cycle time, and memory read/write integrity are confirmed across full operating temperature range.
• Communications Port Test: SNP, SNPX, and Ethernet ports are tested for correct protocol handshake using Proficy Machine Edition and third-party Modbus TCP test tools.
• Analog Module Calibration Check: Analog input and output modules are verified against NIST-traceable reference signals at 0%, 25%, 50%, 75%, and 100% of rated range. Linearity error must be within ±0.1% of full scale.
• Visual and Component Inspection: All modules are inspected for capacitor condition, relay contact wear (output modules), corrosion on edge connectors, and conformal coating integrity.