GE Fanuc Series 90-70 IC697BEM711 Bus Receiver Module

Technical Dossier

Product Details And Specifications

GE Fanuc Series 90-70 IC697BEM711 Technical Notes

The GE Fanuc Series 90-70 (IC697) is a rack-based programmable logic controller platform deployed extensively across global heavy industry — including petrochemical refineries, nuclear power generation facilities, offshore oil & gas platforms, pulp and paper mills, and large-scale water treatment infrastructure. First introduced in the late 1980s, the IC697 architecture established itself as a high-availability, high-throughput control backbone capable of handling complex, multi-rack distributed I/O configurations. The IC697BEM711 is a Bus Receiver Module within this platform, enabling communication between the CPU rack and remote I/O expansion racks via the Series 90-70 VME-based backplane bus. Its role is critical in multi-rack installations where I/O expansion beyond the primary rack is required. Installed base counts for the IC697 series remain substantial globally, making long-term spare parts availability a primary operational concern for plant engineers and maintenance managers.

The Evolution of IC697 Architecture

The Series 90-70 platform was engineered on a VMEbus (Versa Module Eurocard) backplane architecture, a standard that provided high-speed parallel data transfer between modules. Early revisions of the IC697 CPU and I/O modules (circa 1988–1995) operated under the Logicmaster 90-70 programming environment. From the mid-1990s onward, GE Fanuc transitioned programming support to Proficy Machine Edition (ME), which introduced IEC 61131-3 compliance and improved diagnostics. The IC697BEM711 Bus Receiver Module was designed to interface with Bus Transmitter Modules (e.g., IC697BEM731) to extend the rack bus across physical rack boundaries — a topology common in large process control installations requiring geographic separation of I/O from the CPU. Compatibility constraints are significant: IC697 modules are not interchangeable with the later Series 90-30 (IC693) or PACSystems RX7i (IC698) platforms, despite GE Fanuc's marketing of the RX7i as a direct IC697 successor. The RX7i shares the same physical rack form factor and VMEbus backplane, allowing some IC697 I/O modules to operate in RX7i racks under specific firmware conditions — a migration path that extended the operational life of legacy IC697 I/O investments. The IC697 series is now classified as mature/end-of-life by GE Vernova (formerly GE Digital / Emerson), with no new hardware development. Long-term maintenance support is the primary use case for all IC697 procurement activity.

IC697 Full Catalog & Functionalities (SKU List)

CPU Modules

• IC697CPU731: Series 90-70 CPU, 512KB user memory, floating point, Ethernet option
• IC697CPU771: High-performance CPU, 1MB user memory, advanced math co-processor
• IC697CPU781: CPU module, 2MB user memory, redundancy-capable configuration
• IC697CPU782: Redundant CPU module, hot-standby failover, 2MB user memory
• IC697CPU788: CPU module with embedded Ethernet, 2MB user memory, IEC 61131-3

Bus Interface & Communication Modules

• IC697BEM711: Bus Receiver Module — receives VMEbus signals from remote Bus Transmitter for rack expansion
• IC697BEM731: Bus Transmitter Module — transmits VMEbus signals to remote expansion racks via IC697BEM711
• IC697CMM711: Communications Co-processor, supports SNP/SNPX and CCM protocols
• IC697CMM742: Ethernet Interface Module, TCP/IP, 10BaseT, SRTP protocol support
• IC697PCM711: Programmable Co-processor Module, user-programmable C-language co-processor

Discrete I/O Modules

• IC697MDL340: 32-point 24VDC discrete input module, isolated, sink/source compatible
• IC697MDL341: 32-point 24VDC discrete input module, non-isolated
• IC697MDL740: 32-point 24VDC discrete output module, 0.5A per point, sourcing
• IC697MDL753: 16-point 120VAC discrete output module, isolated, 2A per point
• IC697MDL654: 16-point 120VAC discrete input module, isolated

Analog I/O Modules

• IC697ALG320: 8-channel analog input module, 4–20mA / 0–10V, 12-bit resolution
• IC697ALG321: 16-channel analog input module, voltage/current selectable per channel
• IC697ALG440: 8-channel analog output module, 4–20mA / ±10V, 12-bit resolution

Power Supply Modules

• IC697PWR710: 90-264VAC input power supply, 40W output, standard rack power
• IC697PWR724: 18–30VDC input power supply, 40W output, for DC-powered installations

Quality Control for the IC697 Range

IC697 modules present specific test challenges due to their VMEbus backplane interface and the age-related failure modes common in mature industrial electronics. DriveKNMS applies a structured test protocol for all IC697 inventory: modules are powered in a live Series 90-70 test rack using a known-good IC697CPU771 or IC697CPU788 reference CPU. Bus interface modules including the IC697BEM711 are tested in a two-rack configuration with an active IC697BEM731 transmitter to verify full bus handshake, data integrity across the rack boundary, and fault-free operation under continuous I/O scan cycles. Analog modules are tested against calibrated reference signals at both ends of the specified input/output range. Discrete I/O modules are tested under load using resistive and inductive test fixtures. All modules are inspected for capacitor condition, connector pin integrity, and conformal coating status. Units failing any test parameter are quarantined and not listed for sale.