IC695CMU310-CJ GE PACSystems RX3i Hot Standby CPU Module

Product Overview: IC695CMU310-CJ Redundant CPU

The IC695CMU310-CJ is a hot standby redundant CPU module engineered for the GE PACSystems RX3i control platform. Originally developed by GE Fanuc and GE Intelligent Platforms, this module now falls under Emerson's current ownership. For maintenance engineers, the value proposition is straightforward: continuous process availability through hardware redundancy. When the primary CPU faults, the standby unit assumes control without interrupting the controlled process. Consequently, unplanned downtime tied to processor failure drops dramatically.

Key Features and Verified Specifications of the IC695CMU310-CJ

The module pairs a 32-bit processor running at 300 MHz with deterministic scan performance. Specifically, Boolean execution completes in 0.195 ms per 1000 instructions. This rate supports responsive logic solving in demanding scan-critical applications. Memory resources include 10 MB of battery-backed user RAM and 10 MB of non-volatile Flash. The battery-backed RAM preserves retentive data across power cycles, while Flash retains the program without battery dependency.

• Model: IC695CMU310-CJ
• Series: PACSystems RX3i
• Processor: 32-bit, 300 MHz
• Boolean execution: 0.195 ms per 1000 instructions
• User RAM: 10 MB battery-backed
• Non-volatile Flash: 10 MB
• Redundant: Yes (hot standby)
• Serial: RS-232 and RS-485
• Ethernet: 10/100 Mbps auto-negotiation
• Supply voltage: 5 V DC from backplane
• Dimensions (H×W×D): ~178 × 127 × 51 mm (supplier-reported)

Notably, the 5 V DC backplane supply eliminates external power wiring at the module level. This simplifies cabinet design and reduces terminal count. The dual serial ports and auto-negotiating Ethernet interface provide flexible connectivity for programming, peer communication, and supervisory data exchange.

Reliability and Serviceability from a Maintenance Perspective

Redundancy defines this module's operational role. In a hot standby pair, both CPUs execute the same logic while only the primary drives outputs. If the primary fails, the standby assumes control seamlessly. Therefore, the mean time to repair shifts from process restart to module swap. Maintenance engineers should inspect the redundant pair periodically for synchronization health and battery condition. Because the user RAM is battery-backed, the backup battery becomes a wear item. Replace it per the manufacturer's interval to protect retentive data. Environmental factors matter as well: keep the enclosure within the specified thermal range and free of conductive dust. Since the module draws 5 V DC from the backplane, verify backplane power budget headroom before adding modules. These practices protect the redundancy investment and extend service life.

Integration and Compatibility Notes

The IC695CMU310-CJ operates within the PACSystems RX3i backplane ecosystem. Serial connectivity supports RS-232 and RS-485 devices, while the Ethernet port handles 10/100 Mbps auto-negotiation. When integrating into plant networks, confirm cable types and any required gateways with the supplier. For precise matching of this module to your existing RX3i chassis and I/O configuration, contact AutoDCSTech with your exact requirements.

Availability and Lifecycle Status

Official Emerson production status for the IC695CMU310-CJ remains unverified. The module is currently available through aftermarket channels, with last verification in September 2026. Please verify current lifecycle status and availability with AutoDCSTech before ordering.