GE Fanuc IC670CHS101C I/O Terminal Block

Technical Dossier

Product Details And Specifications

GE Fanuc IC670 Series Technical Notes

The GE Fanuc IC670 series — commercially designated as the Series 90-70 distributed I/O subsystem — represents one of the most widely deployed programmable controller I/O architectures in global heavy industry. Installed across petrochemical complexes, nuclear power generation facilities, offshore oil platforms, and continuous-process refineries, the IC670 platform established a field-proven standard for distributed I/O expansion in environments where signal integrity, backplane reliability, and long-term parts availability are non-negotiable operational requirements. Its modular terminal block and carrier architecture enabled system integrators to construct scalable I/O assemblies without rewiring field devices during module replacement — a critical advantage in facilities operating under strict change-management protocols. The IC670CHS101C I/O Terminal Block is a core mechanical and electrical interface component within this architecture, providing the field-wiring termination point for discrete and analog I/O modules mounted on IC670 carriers.

The Evolution of IC670 Architecture

The IC670 distributed I/O family was introduced as part of GE Fanuc's Series 90-70 PLC ecosystem in the late 1980s, designed to extend the Series 90-70 CPU rack's I/O capacity over a serial bus to remote drop locations. The architecture evolved through three identifiable phases. In its initial release, the IC670 system relied on the IC670ALG230 and IC670MDL640 modules communicating over a proprietary GE Genius Bus (IC660) interface, with the IC670CHS001 and IC670CHS101 carriers providing the physical mounting and backplane connectivity. The second phase introduced enhanced terminal block variants — including the IC670CHS101C — which incorporated improved field-wiring retention and higher vibration tolerance ratings suitable for rotating-machinery environments. The third phase addressed compatibility with GE's transition to the PACSystems RX7i and RX3i platforms, where IC670 I/O drops could be retained via IC695LRE001 remote expansion adapters, preserving existing field wiring investments. As of 2026, the IC670 series is classified as a mature/end-of-life product line by GE Vernova (formerly GE Digital). OEM production of most IC670 modules has ceased; however, the installed base across legacy DCS and PLC systems in refineries and power plants sustains active demand for replacement and spare parts. Long-term maintenance support — including tested surplus and refurbished units — remains the primary sourcing channel for this series.

IC670 Full Catalog & Functionalities (SKU List)

The following represents a structured index of verified IC670 series components, organized by functional category. Each entry reflects a documented, production-released part number within the GE Fanuc IC670 / Series 90-70 distributed I/O ecosystem.

Terminal Blocks & Carriers

• IC670CHS101C: 11-slot I/O terminal block carrier, field-wiring termination for discrete/analog modules
• IC670CHS001: 5-slot I/O carrier base, standard backplane for IC670 module mounting
• IC670CHS002: 10-slot I/O carrier base, extended backplane configuration
• IC670CHS101: 11-slot terminal block carrier, predecessor to IC670CHS101C revision
• IC670CHS102: 11-slot terminal block carrier with enhanced grounding rail

Discrete Input Modules

• IC670MDL640: 16-point 24VDC discrete input module, sink/source compatible
• IC670MDL641: 16-point 120VAC discrete input module, isolated inputs
• IC670MDL642: 32-point 24VDC discrete input module, high-density configuration
• IC670MDL643: 16-point 240VAC discrete input module

Discrete Output Modules

• IC670MDL740: 16-point 24VDC discrete output module, sourcing type
• IC670MDL741: 16-point 120VAC discrete output module, triac output
• IC670MDL742: 8-point relay output module, Form C contacts, 2A per point
• IC670MDL743: 16-point 24VDC discrete output module, sinking type

Analog I/O Modules

• IC670ALG230: 4-channel analog input module, 4–20mA / 0–10V configurable
• IC670ALG231: 8-channel analog input module, 12-bit resolution
• IC670ALG320: 2-channel analog output module, 4–20mA current loop
• IC670ALG321: 4-channel analog output module, voltage/current selectable

Communications & Bus Interface

• IC670GBI001: Genius Bus Interface Unit (BIU), connects IC670 drop to Genius Bus segment
• IC670GBI002: Genius Bus Interface Unit, dual-bus redundancy configuration