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The GE IC695CRU320-EJ is a high-performance Redundancy CPU module in Emerson's (formerly GE Fanuc/GE Intelligent Platforms) PACSystems RX3i series, specifically engineered for Hot Standby CPU redundancy applications. Featuring a 1 GHz Intel Celeron-M processor, 64 Mbytes battery-backed RAM, and 64 Mbytes non-volatile flash user memory, the GE IC695CRU320-EJ provides seamless bumpless transfer, fault tolerance, and continuous operation in mission-critical systems. It supports dual redundancy links via IC695RMX128/RMX228 modules, integrates with Ethernet-based I/O (including PROFINET), and offers advanced diagnostics for high-availability control in process, discrete, and hybrid automation. The GE IC695CRU320-EJ includes two independent serial ports (RS-232/RS-485) for programming, HMI, or device communication. Programmable with Proficy Machine Edition (PME), the GE IC695CRU320-EJ excels in redundant setups for turbines, oil & gas, power generation, and manufacturing where downtime is unacceptable. As a legacy redundancy CPU, the GE IC695CRU320-EJ remains widely used and supported for sustaining RX3i Hot Standby systems.

Model,GEIC695CRU320-EJ

Manufacturer,GE Intelligent Platforms / Emerson Automation

Series,PACSystems RX3i

Product Type,Redundancy CPU (Hot Standby)

Processor,"Intel Celeron-M, 1 GHz"

User Memory,64 Mbytes battery-backed RAM; 64 Mbytes non-volatile flash

Floating Point Support,Yes

Serial Ports,2 independent (RS-232/RS-485)

Ethernet,"Supported via add-on modules (e.g., for PROFINET/EGD redundancy)"

Redundancy Links,Requires IC695RMX128 or IC695RMX228 (typically two links recommended)

I/O Capacity,Up to 32K points (with RX3i I/O)

Power Requirements,+3.3 VDC: 1.0 A nominal; +5 VDC: 1.2 A nominal (from backplane)

Operating Temperature,0°C to 60°C (some sources indicate extended -40°C to 70°C variants)

Mounting,Occupies two slots in RX3i universal backplane

Additional Features,"ECC memory support, bulk memory via %W table, configurable redundancy parameters, seamless switchover"

Install two GE IC695CRU320-EJ modules (primary and secondary) into compatible double-slot positions in separate RX3i racks or the same rack if supported.

Mount IC695RMX128/RMX228 redundancy link modules in each rack and connect fiber optic cables between them for synchronization.

Wire power supplies (e.g., IC695PSA040) to both racks and ensure stable 24 VDC input.

Configure redundancy settings in Proficy Machine Edition (PME): set Dual HWC to True, define primary/secondary roles, and map I/O.

Download identical application logic to both CPUs via Ethernet or serial ports.

Power up the system; observe LEDs for synchronization status (SYNC, ACTIVE, etc.) and perform role switch test if needed.

Monitor redundancy health, bumpless transfer, and diagnostics through PME or HMI during operation.

Power down both primary and secondary racks before inserting or removing any GE IC695CRU320-EJ or RMX modules to prevent backplane faults or unsafe conditions.

Use ESD protection (wrist strap, grounded mat) when handling the CPU to avoid damaging the processor or memory components.

Confirm backplane slot compatibility (double-slot required) and identical firmware versions on both redundancy CPUs before commissioning.

Properly terminate and route redundancy link fiber cables (avoid sharp bends, ensure clean connectors) for reliable synchronization.

Verify power supply current capacity supports dual CPUs, RMX modules, and I/O; check for sufficient +3.3 V and +5 V rails.

Initialize ECC memory on first power-up by applying power with battery disconnected (if required per firmware).

After installation, run full redundancy diagnostics in PME to confirm link health, memory sync, and no faults before going online.

Check front-panel LEDs on each GE IC695CRU320-EJ daily for ACTIVE, BACKUP, SYNC, FAULT, and redundancy status indications.

Monitor PME diagnostics or HMI for redundancy alarms, scan discrepancies, link errors, or role switch events.

Inspect rack temperature and ventilation to keep ambient within 0–60°C; ensure cooling fans operate normally.

Review event logs, fault tables, and synchronization statistics to detect early signs of link degradation or mismatch.

Clean dust from module vents, backplane, and RMX fiber connectors (power off) using compressed air every 1–3 months.

Periodically test manual role switching and bumpless transfer during low-impact windows to validate redundancy integrity.

Verify battery status (external high-capacity IC693ACC302 recommended) and firmware alignment; apply updates only during planned outages.

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