GE IC687RCM711 Redundancy Communications Module

Description

Technical Specifications

• Module Type: Half‑slot Redundancy Communications Module (RCM), Series 90‑70, Hot Standby CPU Redundancy/FIP single‑rack redundancy.
• Function: CPU synchronization, shared I/O data transfer, manual switchover between active/backup CPUs.
• Data Transfer Rate: 500 KB/s (high‑speed parallel bus expansion interface).
• Power Supply: 5 VDC from rack backplane; 1.2 A current requirement.
• Connectors: Two DB9 serial ports; top for Bus Transmitter Module (BTM) connection, bottom unused.
• LED Indicators: Five green LEDs – BOARD OK (module health), LOCAL READY (local CPU ready), LOCAL ACTIVE (local CPU active), REMOTE READY (remote CPU ready), REMOTE ACTIVE (remote CPU active).
• Manual Control: Pushbutton for manual switchover between active and backup CPUs.
• Cable Length: Up to 0.9 m (3 ft) for FIP single‑rack redundancy interconnections.
• Slot Requirement: Occupies one half‑slot in redundant rack; install in any slot of rack 0 except PL3 and PL11.
• Compatibility: Works with IC697CFR782/IC697CFR28 CPUs; IC687BEM713 BTM; IC697PWR712/PWR748 power supplies.
• Physical Dimensions: 59 mm × 115 mm × 40 mm; weight 0.65 kg (1.43 lbs).
• Operating Environment: –10°C to +55°C; 5–95% RH (non‑condensing); IP20 protection.
• Certifications: CE, UL 508, CSA C22.2 No. 14; IEC 61131‑2 compliant.

Functional Characteristics

• CPU Synchronization: Delivers high‑speed synchronizing messages from active to backup CPU, ensuring identical system states for seamless failover.
• Shared I/O Data Transfer: Provides dedicated pathway for shared I/O data exchange between CPUs, maintaining consistent control across redundant systems.
• Manual Switchover Pushbutton: Allows operator to manually transfer control from active to backup CPU for planned maintenance or testing.
• Five Status LEDs: Instant visual feedback on module health and CPU status (local/remote ready/active) for quick troubleshooting.
• Half‑Slot Design: Occupies one slot in redundant rack, optimizing space for other modules.
• High‑Speed Data Transfer: 500 KB/s ensures minimal synchronization latency, critical for time‑sensitive applications.
• FIP Single‑Rack Redundancy Support: Up to 0.9 m (3 ft) cable length meets single‑rack interconnection requirements.
• Dual Module Requirement: Two RCMs per redundant system ensure reliable communication between active/backup racks.
• Broad CPU/Module Compatibility: Works with IC697CFR782/IC697CFR28 CPUs, IC687BEM713 BTM, and IC697PWR712/PWR748 power supplies.
• Hot Standby Failover: Enables uninterrupted control during CPU failures, maximizing system availability.

Application Scenarios

• Power Generation: Nuclear, thermal, hydro power plants; 500 KB/s data transfer synchronizes active/backup CPUs for turbine/generator control, manual switchover supports planned maintenance, five LEDs speed fault isolation, 1500 VAC isolation protects PLC from electrical noise.
• Oil & Gas Processing: Refineries, pipelines; seamless failover prevents shutdowns during CPU failures, shared I/O data transfer maintains valve/pump control consistency, half‑slot design fits compact control rooms.
• Chemical Manufacturing: Batch processes, reactor control; high‑speed synchronization ensures recipe consistency, manual switchover avoids production losses during maintenance, five LEDs enable 24/7 monitoring.
• Water & Wastewater Treatment: Pump stations, filtration plants; Hot Standby redundancy prevents treatment process interruptions, shared I/O data transfer maintains flow/level control, 0.9 m cable length fits single‑rack setups.
• Manufacturing Automation: Automotive, semiconductor lines; 500 KB/s transfer minimizes production line downtime during CPU failover, manual switchover supports scheduled maintenance without stopping lines.
• Mission‑Critical Infrastructure: Airports, data centers; uninterrupted control of HVAC, security, and power systems, five LEDs enable remote monitoring, half‑slot design optimizes rack space.
• Legacy System Retrofit: Upgrades Series 90‑70 PLCs with redundancy; works with existing IC697CFR782/IC697CFR28 CPUs, IC687BEM713 BTM, and IC697PWR712/PWR748 power supplies, ensuring backward compatibility.