GE Series 90-30 IC694 Modules: IC694CPU771,

Technical Dossier

Product Details And Specifications

GE Series 90-30 IC694 Series: Comprehensive Module Range and Technical Overview

The GE Series 90-30 (IC694 platform) is a rack-based programmable logic controller system developed by GE Automation & Controls (formerly GE Fanuc). It has accumulated a substantial installed base across global heavy industry sectors including petrochemical refining, nuclear auxiliary systems, pulp and paper processing, water treatment infrastructure, and continuous manufacturing lines. Its modular backplane architecture — supporting 5-slot, 10-slot, and expansion rack configurations — made it a standard-bearer for mid-range DCS/PLC integration throughout the 1990s and 2000s. Many facilities operating IC694 hardware continue to run it under long-term maintenance contracts, making spare parts availability a critical operational concern.

The Evolution of IC694 Architecture

The Series 90-30 platform was introduced in the early 1990s as a successor to GE's Series Six and Series Five PLC lines. The IC693 designation covered the original 3.3V logic generation; the IC694 designation marked the transition to an enhanced backplane bus with improved throughput and expanded I/O addressing. Key architectural milestones include:

• Early Generation (IC693/IC694 co-existence, ~1993–1998): Initial CPU modules offered limited user memory (6KB–32KB). Rack communication relied on the Series 90-30 backplane bus at fixed scan rates. Many IC693 modules are physically interchangeable with IC694 racks but carry firmware incompatibilities.
• Mid Generation (~1998–2006): CPU modules such as the IC694CPU760 and IC694CPU771 introduced expanded memory (up to 240KB), Ethernet-ready variants, and support for Motion Mate DSM314/DSM324 motion control modules. This era represents the peak deployment period for the platform.
• Late/Sustaining Generation (~2006–2015): GE introduced the RX3i (IC695 platform) as the architectural successor, offering a PCI-based backplane, higher CPU clock speeds, and IEC 61131-3 compliance. IC694 production continued in parallel to support the installed base.
• End-of-Life / Sustaining Support (~2015–present): GE (subsequently Emerson after the 2023 acquisition of GE's automation division) formally moved IC694 to sustaining support status. New production of select modules has ceased. Third-party MRO suppliers and authorized repair depots are the primary sourcing channel for replacement units.

IC694 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly deployed modules within the GE Series 90-30 IC694 platform. Modules are classified by functional category.

CPU / Controller Modules

• IC694CPU760: Series 90-30 CPU, 32KB user memory, standard scan, no embedded Ethernet
• IC694CPU771: Series 90-30 CPU, 240KB user memory, 512 discrete I/O points, no embedded Ethernet — primary SKU for this listing
• IC694CPU772: Series 90-30 CPU, 240KB user memory, embedded 10BaseT Ethernet port
• IC694CPU774: Series 90-30 CPU, 240KB user memory, dual embedded Ethernet, enhanced diagnostics
• IC694CPU780: Series 90-30 CPU, 512KB user memory, high-capacity scan, supports advanced motion modules
• IC694CPU781: Series 90-30 CPU, 512KB user memory, embedded Ethernet, expanded I/O map

Discrete Input Modules (DI)

• IC694MDL230: 8-point 120VAC discrete input module, isolated
• IC694MDL231: 16-point 120VAC discrete input module
• IC694MDL240: 8-point 24VDC discrete input module, positive logic
• IC694MDL241: 16-point 24VDC discrete input module, positive logic
• IC694MDL260: 32-point 24VDC discrete input module, high-density

Discrete Output Modules (DO)

• IC694MDL330: 8-point 120VAC discrete output, relay type
• IC694MDL340: 8-point 24VDC discrete output, transistor sourcing
• IC694MDL341: 16-point 24VDC discrete output, transistor sourcing
• IC694MDL390: 32-point 24VDC discrete output, high-density transistor

Analog Input / Output Modules (AI/AO)

• IC694ALG220: 4-channel analog input, 4–20mA / 0–10V configurable
• IC694ALG221: 8-channel analog input, 4–20mA / 0–10V configurable
• IC694ALG390: 4-channel analog output, 4–20mA / 0–10V configurable
• IC694ALG391: 8-channel analog output, 4–20mA / 0–10V configurable

Communication & Network Adapter Modules

• IC694CMM301: Serial communications module, RS-232/RS-485, supports SNP/SNPX protocols
• IC694CMM302: Dual-port serial communications module
• IC694PBS001: PROFIBUS-DP slave adapter for Series 90-30 rack

Power Supply Modules

• IC694PWR321: 120/240VAC input power supply, 30W output for Series 90-30 rack
• IC694PWR330: 24VDC input power supply, 30W output for Series 90-30 rack
• IC694PWR331: 120/240VAC input power supply, 40W high-capacity output

Sourcing Hard-to-Find & Obsolete IC694 Parts

As the IC694 platform has entered sustaining/end-of-life status with the OEM, procurement of replacement modules through standard distribution channels is increasingly unreliable. Lead times from authorized distributors for select CPU and communication modules can exceed 26 weeks, or units may be listed as permanently discontinued.

DriveKNMS maintains a dedicated inventory of IC694 series modules sourced through verified MRO channels, decommissioned plant buybacks, and authorized repair networks. Our sourcing protocol covers:

• New-surplus (factory-sealed, date-coded) units for CPU and power supply modules
• Professionally refurbished units with full functional test certification for I/O modules
• Cross-reference support for IC693-to-IC694 compatibility verification
• Identification of RX3i (IC695) migration paths where direct replacement is no longer feasible

For facilities operating IC694 hardware under long-term maintenance agreements, DriveKNMS offers blanket order arrangements and priority allocation for critical spare classifications.

Quality Control for the IC694 Range

IC694 modules present specific test challenges due to their backplane bus communication architecture and mixed-voltage I/O designs. DriveKNMS applies the following test procedures to all IC694 units prior to shipment:

• Backplane Bus Integrity Test: Each module is seated in a live Series 90-30 test rack and verified for correct backplane enumeration and data exchange at rated scan rates.
• CPU Memory Verification: For CPU modules (including IC694CPU771), user memory is written, read, and verified across the full addressable range. Battery-backed SRAM retention is tested over a minimum 4-hour hold period.
• I/O Channel Functional Test: All discrete and analog channels are exercised at rated voltage/current. Analog modules are calibrated against a traceable reference standard.
• Communication Port Test: Serial and Ethernet ports on communication modules are tested for correct protocol handshake and data throughput.
• Thermal Burn-In: Select CPU and power supply modules undergo a 24-hour powered burn-in at ambient temperature to screen for early-life failures.
• Firmware Version Documentation: CPU module firmware revisions are recorded and disclosed to the buyer prior to shipment to ensure compatibility with the target application.