When a Line Cannot Afford to Stop
A plant running continuous process control faces one hard truth: a single CPU failure can halt production in seconds. That is the challenge the IC695CMU310-CJ was built to solve. This GE hot standby redundant CPU module for the PACSystems RX3i platform keeps a backup unit synchronized and ready, so control survives a primary fault. For oil, gas and industrial automation sites, that redundancy is not a luxury — it is uptime insurance.
What the IC695CMU310-CJ Delivers
The IC695CMU310-CJ is a redundant CPU for the GE Fanuc / GE Intelligent Platforms PACSystems RX3i series, now under Emerson ownership. It carries a 32-bit, 300 MHz processor and executes Boolean logic at 0.195 ms per 1000 instructions — responsive enough for demanding scan-cycle requirements. Memory includes 10 MB of battery-backed user RAM and 10 MB of non-volatile Flash, so programs and data survive power loss.
Technical Specifications
| Specification | Value |
|---|---|
| Processor | 32-bit, 300 MHz |
| Boolean execution | 0.195 ms per 1000 instructions |
| User RAM | 10 MB battery-backed |
| Non-volatile Flash | 10 MB |
| Serial ports | RS-232 and RS-485 |
| Ethernet | 10/100 Mbps auto-negotiation |
| Supply voltage | 5 V DC from backplane |
| Redundancy | Yes |
| Dimensions (H×W×D) | ~178 × 127 × 51 mm |
Where Redundancy Pays Off
In a gas compression station, a CPU fault during peak demand can trigger an unplanned shutdown and costly restart. With the IC695CMU310-CJ in a hot standby pair, the backup takes over without losing the process. The same logic applies to water treatment and pipeline monitoring, where the dual serial ports (RS-232 and RS-485) connect to legacy field devices while the 10/100 Mbps Ethernet link handles supervisory traffic. The 10 MB battery-backed RAM holds critical recipes and setpoints through outages.
Integration and Setup Notes
The module draws 5 V DC from the RX3i backplane, so no external supply wiring is needed. For Ethernet-based networks, wiring into a plant network may require an external gateway or connection module; confirm cables and gateways with your supplier before commissioning. Serial devices connect directly to the RS-232 and RS-485 ports. Because this is a redundant CPU, correct hot standby configuration depends on matched firmware and proper rack placement — follow the manufacturer’s installation manual.
Availability and Selection Help
Official Emerson production status for the IC695CMU310-CJ is unverified; it is currently available in aftermarket channels (last verified: 2026-09). Please verify current lifecycle status and availability with Oil AutoTech before ordering. Oil AutoTech offers fast-dispatch spares for oil, gas and industrial automation, plus hands-on technical selection help to match the right module to your RX3i rack. Contact Oil AutoTech today for pricing and availability.
Maintenance for Long Service
Inspect the module periodically for secure seating, clean airflow and battery health on the RAM backup. Environmental factors such as heat and vibration shorten electronics life, so keep cabinet conditions within the panel design limits. Because this CPU supports redundancy, routine checks should confirm both units remain synchronized. Spares when you need them — fast dispatch, worldwide.
