GE IC660 Modules – IC660HHM501

Technical Dossier

Product Details And Specifications

GE IC660 Series Technical Notes

The GE IC660 series, commercially designated as the Genius I/O system, is a distributed I/O platform developed by GE Fanuc Automation (now part of Emerson / GE Vernova). It has been deployed across heavy industrial sectors including petrochemical refineries, nuclear power generation facilities, offshore platforms, and continuous-process chemical plants. The IC660 architecture operates on the Genius Bus — a single-cable, token-passing serial network capable of connecting up to 32 bus interface units (BIUs) per segment at data rates up to 153.6 Kbaud. Its deterministic scan cycle and high noise immunity made it a standard specification in safety-instrumented and process-critical environments throughout the 1990s and 2000s. Installed base estimates place active IC660 deployments in the tens of thousands of nodes globally, with many sites maintaining the platform well beyond its original design life due to the cost and complexity of full DCS migration.

The Evolution of IC660 Architecture

The IC660 platform was introduced in the mid-1980s as GE's answer to distributed I/O requirements in large-scale process automation. The original Genius Bus used a single twisted-pair cable with a proprietary protocol, allowing field devices to communicate directly with a host PLC (Series 90-70 or Series 90-30) without intermediate marshalling panels. Early hardware revisions used conformal-coated PCBs rated for industrial ambient conditions up to 60°C.

In subsequent generations, GE Fanuc introduced enhanced diagnostics, expanded the analog resolution from 12-bit to 13-bit on select modules, and added redundant bus capability through dual-bus BIUs. The IC660 series maintained backward compatibility across hardware revisions, meaning a replacement module from a later production run would operate on a bus configured for an earlier revision — a critical factor for long-lifecycle plant maintenance.

By the early 2010s, GE Fanuc (rebranded as GE Intelligent Platforms, then Emerson) formally moved the IC660 series into a sustained-support / end-of-active-development status. New projects migrated to the RX3i (IC695) platform. However, the IC660 series remains in active spare-parts demand because plant operators cannot justify full migration costs during operational windows. Compatibility with Series 90-70 CPUs (IC697) and Series 90-30 CPUs (IC693) remains a key integration constraint when sourcing replacement modules.

IC660 Full Catalog & Functionalities (SKU List)

Analog Input Modules

• IC660BBA020: 4-channel analog input block, 4–20 mA, Genius Bus interface, field-powered
• IC660BBA024: 4-channel analog input block, 1–5 V / 4–20 mA selectable, 12-bit resolution
• IC660BBA100: 8-channel analog input block, 4–20 mA, 13-bit resolution, extended diagnostics
• IC660BBA104: 8-channel analog input block, thermocouple/RTD input, cold-junction compensation
• IC660EBA100: 8-channel analog input, ELITE series, enhanced noise rejection, conformal coat

Analog Output Modules

• IC660BBA020 (output variant): 2-channel analog output, 4–20 mA, 12-bit DAC, loop-powered
• IC660EBA020: 2-channel analog output, ELITE series, 13-bit DAC, short-circuit protected

Digital Input Modules

• IC660BBD020: 8-point discrete input block, 24 VDC, Genius Bus, group isolation
• IC660BBD024: 16-point discrete input block, 24 VDC, individual point diagnostics
• IC660BBD100: 32-point discrete input block, 24 VDC, high-density, DIN-rail mount
• IC660EBD100: 32-point discrete input, ELITE series, extended temperature range −40°C to +70°C

Digital Output Modules

• IC660BBD110: 16-point discrete output block, 24 VDC / 0.5 A per point, solid-state
• IC660CBD110: 16-point discrete output, relay contact type, 120/240 VAC, 2 A per point
• IC660EBD110: 16-point discrete output, ELITE series, 24 VDC, enhanced surge protection

Communications & Bus Interface

• IC660ELB921: Genius Bus Controller (GBC), dual-bus redundancy capable, Series 90-70 rack mount
• IC660FP900: Field Control Processor, standalone Genius Bus master, embedded logic execution

Power Supply Modules

• IC660TSA100: 24 VDC power supply for Genius I/O bus blocks, 5 A output, DIN-rail
• IC660TSD100: Redundant power supply module, automatic failover, status relay output

HMI & Handheld Devices

• IC660HHM501: Hand Held Monitor for Genius Bus diagnostics — reads bus status, block health, and point-level data; used for commissioning and fault isolation without a host PLC connection

Sourcing Hard-to-Find & Obsolete IC660 Parts

For operators requiring lifecycle extension beyond OEM support windows, DriveKNMS provides: verified NOS units with original factory packaging where available; tested-functional pull units with full inspection documentation; cross-reference analysis to identify compatible substitute part numbers within the IC660 family; and technical consultation on bus configuration when replacing modules with different hardware revisions. All IC660 inventory is stored in ESD-safe, climate-controlled conditions to preserve PCB integrity on boards that may have been in storage for extended periods.

Quality Control for the IC660 Range

IC660 modules present specific test challenges due to their integrated Genius Bus communication logic and the tight coupling between the BIU firmware and the I/O point hardware. DriveKNMS applies a structured test protocol for all IC660 units prior to shipment:

• Bus Communication Verification: Each module is placed on a live Genius Bus segment and queried by a Series 90-70 host CPU. Block identity, serial number, and configuration data are read back and compared against the module label.
• Point-Level Functional Test: All I/O points are exercised at rated voltage and current. Analog modules are tested against a calibrated signal source; output accuracy is verified to within ±0.1% of full scale.
• Diagnostic Register Inspection: The IC660HHM501 Hand Held Monitor is used to read internal diagnostic registers, confirming no latched fault codes or hardware error flags are present.
• Thermal Cycling: Modules flagged as long-term storage units undergo a 4-hour thermal soak at 55°C to screen for latent capacitor or solder-joint failures before final test.
• Visual and Mechanical Inspection: Backplane connectors, terminal blocks, and PCB surfaces are inspected under magnification for corrosion, mechanical damage, or evidence of prior field repair.