GE Series 90-70 IC697 Modules: IC697ALG321 Analog Input Module

Technical Dossier

Product Details And Specifications

GE Series 90-70 (IC697) Series: Comprehensive Module Range and Technical Overview

The GE Series 90-70 — identified by the IC697 prefix — is one of the most widely deployed rack-based PLC platforms in global heavy industry. Installed across petrochemical complexes, nuclear power stations, oil refineries, pulp and paper mills, and large-scale water treatment facilities, the Series 90-70 architecture established the benchmark for high-density, high-availability programmable control in the 1990s and 2000s. Its 9-slot and 16-slot VME-based backplane supports mixed I/O configurations, redundant CPU arrangements, and high-speed communications — making it a platform of record for facilities with 20–30 year operational lifecycles.

The IC697ALG321 is a 16-channel analog input module within this family, designed for precision voltage and current signal acquisition in process control environments. It interfaces directly with the Series 90-70 backplane bus and is configurable via the GE Proficy Machine Edition (formerly Logicmaster 90) programming environment.

The Evolution of IC697 (Series 90-70) Architecture

The Series 90-70 platform was introduced by GE Fanuc Automation in the early 1990s as a successor to the Series Six and Series Five PLC families. Its VMEbus-derived backplane provided a significant leap in data throughput and module density compared to proprietary bus architectures of the era.

Generation 1 (1991–1997): Initial CPU modules (IC697CPU731, IC697CPU771) with limited memory and no embedded Ethernet. Programming via serial RS-422 using Logicmaster 90-70 software on DOS platforms.

Generation 2 (1997–2004): Introduction of high-performance CPUs (IC697CPU781, IC697CPU782) with expanded memory maps, floating-point coprocessors, and support for the Genius Bus Controller (IC697BEM731). Ethernet NIU modules (IC697CMM742) enabled network integration.

Generation 3 (2004–2012): CPE010/CPE020/CPE030 series CPUs introduced with embedded Ethernet ports, replacing the need for separate NIC modules. Compatibility with Proficy HMI/SCADA and OPC-DA servers established.

End-of-Life / Lifecycle Extension Phase (2012–present): GE (now part of Emerson Automation Solutions after the 2023 acquisition of GE Intelligent Platforms assets) formally discontinued new production of most IC697 modules. Installed base remains active at thousands of facilities globally. Third-party lifecycle support, refurbished stock, and functional equivalents are the primary sourcing channels.

Compatibility note: IC697 modules are not electrically or mechanically interchangeable with the Series 90-30 (IC693) or PACSystems RX7i (IC698) families, despite sharing programming software lineage.

IC697 Full Catalog & Functionalities (SKU List)

Analog Input Modules

• IC697ALG321: 16-channel analog voltage/current input, ±10V / 4–20mA, 12-bit resolution
• IC697ALG320: 8-channel analog input module, voltage/current configurable per channel
• IC697ALG440: 4-channel analog input, high-speed, for fast process loops
• IC697ALG441: 4-channel analog input with isolated channels, thermocouple/RTD compatible

Analog Output Modules

• IC697ALG320: 8-channel analog output, 0–10V / 4–20mA selectable
• IC697ALG432: 4-channel analog output, 12-bit, voltage and current output
• IC697ALG442: 4-channel isolated analog output module

Digital Input Modules

• IC697MDL340: 32-point 24VDC positive logic discrete input module
• IC697MDL341: 32-point 24VDC negative logic discrete input module
• IC697MDL653: 16-point 120VAC isolated discrete input module
• IC697MDL654: 32-point 120VAC discrete input module

Digital Output Modules

• IC697MDL752: 32-point 24VDC positive logic discrete output, 0.5A per point
• IC697MDL753: 32-point 24VDC negative logic discrete output module
• IC697MDL940: 16-point relay output module, Form C contacts

CPU & Controller Modules

• IC697CPU771: Series 90-70 CPU, 512KB user memory, standard performance
• IC697CPU781: High-performance CPU, 1MB user memory, floating-point support
• IC697CPU782: Dual-port memory CPU for redundancy configurations
• IC697CPE010: Enhanced CPU with embedded 10/100 Ethernet port
• IC697CPE030: High-capacity CPU, 10MB user memory, embedded Ethernet

Communications & Network Modules

• IC697BEM731: Genius Bus Controller, master/slave Genius network interface
• IC697CMM742: Ethernet NIC module, 10BaseT, TCP/IP and SRTP protocol support
• IC697CMM711: Serial communications module, RS-232/RS-422/RS-485

Power Supply Modules

• IC697PWR710: 120/240VAC input power supply, 30W output for 9-slot rack
• IC697PWR711: 24VDC input power supply, 30W, for DC-powered installations
• IC697PWR724: High-capacity power supply, 55W, for fully populated 16-slot racks

Sourcing Hard-to-Find & Obsolete IC697 Parts

With GE's formal discontinuation of IC697 production, the global supply of new-manufacture modules has been exhausted. Facilities operating Series 90-70 systems face three primary sourcing challenges: long lead times from OEM channels, counterfeit modules entering the secondary market, and the absence of direct replacements that maintain backplane compatibility.

DriveKNMS maintains a dedicated inventory of tested IC697 modules sourced from decommissioned systems, authorized surplus channels, and controlled refurbishment pipelines. For the IC697ALG321 specifically, DriveKNMS provides:

• Functional testing against GE's original I/O accuracy specifications (±0.1% full scale)
• Firmware version verification and documentation
• Traceability records for each unit shipped
• Emergency same-day dispatch for critical plant shutdowns

For facilities requiring long-term maintenance contracts covering the full IC697 rack — including CPU, power supply, and I/O modules — DriveKNMS offers multi-year lifecycle support agreements with guaranteed stock reservation.

Quality Control for the IC697 Range

The IC697 backplane operates on a proprietary parallel bus at 5V logic levels. Module testing requires a live Series 90-70 rack environment or a dedicated backplane simulator — standard bench testers used for IC693 or IC698 modules are not compatible.

DriveKNMS quality control procedures for IC697 modules include:

• Backplane bus integrity test: Each module is seated in a powered IC697 rack and polled by a reference CPU to confirm correct slot addressing and data exchange.
• Analog channel calibration (for ALG-series): All 16 channels of the IC697ALG321 are verified against a calibrated signal source at 0%, 25%, 50%, 75%, and 100% of input range. Results are logged and shipped with each unit.
• Thermal cycling: Modules are cycled between 0°C and 60°C operating range to identify latent component failures before shipment.
• Visual and component inspection: PCB inspection for corrosion, capacitor bulge, cold solder joints, and counterfeit IC markings.
• Firmware and configuration reset: All modules are returned to factory default configuration state prior to shipment.