Product Overview

The General Electric IC687RCM711 is a redundancy communications module used in Series 90-70 PLC hot-standby systems to maintain continuous operation during controller faults or planned maintenance. It provides the high-speed data link required to keep the primary and secondary CPU racks synchronized, enabling controlled failover without disrupting the process sequence.

Installed in a single rack slot, the module supports reliable rack-to-rack redundancy messaging and provides local status indication for commissioning and ongoing diagnostics. A front-panel control feature also supports operator-initiated switchover for testing and maintenance procedures.

Key Technical Characteristics

• Model / order number: IC687RCM711

• Module type: Redundancy communications module

• PLC platform: Series 90-70 hot standby systems

• Primary function: Synchronization link between active and standby CPUs

• Data transfer performance: Up to 500 KB per second

• Installation footprint: Single-slot module for PLC rack mounting

• Cable support: Redundancy link cable length up to 15 meters

• Front-panel diagnostics: 5 green LED indicators for status monitoring

• Manual control: Front-panel pushbutton for operator-initiated switchover

• Power requirement: 5 V bus draw 1.2 A

• Isolation requirement: No external isolation required by design

• Condition: Brand new

• Product lifecycle status: Active

• Country of origin: USA

• Availability: In stock

• Minimum order quantity: 1

• Approximate dimensions: 20 × 11.5 × 5.7 cm

• Approximate weight: 0.9 kg

• HS code: 8537101190

• System application: DCS and industrial PLC control cabinets

• Communication service: Ethernet router

Industrial Applications

• High-availability PLC control systems using Series 90-70 hot standby architecture

• Continuous-process plants where controller uptime is required

• Redundant CPU rack synchronization for mission-critical automation

• Maintenance and commissioning workflows requiring manual switchover testing

• Installed-base replacement for IC687RCM711 redundancy communication links