The IC695CRU320 is the redundancy-capable member of the PACSystems RX3i CPU family. In a hot-standby pair, the active controller executes the application while the partner remains synchronized for a controlled transfer if the active unit or its path becomes unavailable.

It provides 64 MB of battery-backed RAM, 64 MB of nonvolatile flash and two serial ports. Redundancy synchronization is not provided by those serial ports: every CPU in the pair needs a compatible IC695RMX128 or IC695RMX228 Memory Xchange module configured as the redundancy link.

Confirm the complete suffix, firmware level, RX3i Universal backplane, matching partner CPU and RMX link before treating one unit as a direct replacement.

What buyers should verify in the photos

Check that the front and side nameplates show the complete IC695CRU320 order code rather than the visually similar IC695CPU320. Confirm the hardware suffix, manufacturing label, connector condition, indicator area and housing condition.

For an installed hot-standby system, compare both CPU revisions and the IC695RMX128/228 modules already fitted. A matching base number alone does not confirm that the existing firmware and redundancy configuration can be retained.

The two onboard connectors are serial communication ports. Ethernet communication is normally provided by a separate IC695ETM001 rack module, so the surrounding rack layout should also be checked before replacement.

No. IC695CRU320 is intended for CPU redundancy, while IC695CPU320 is a standard CPU. Confirm the full order code, suffix, firmware, partner CPU, RMX link and project configuration before replacement.

The CPU can be installed only within a supported RX3i architecture, but a functioning hot-standby pair requires two compatible CRU320 CPUs and an IC695RMX128 or IC695RMX228 redundancy link in each unit. Plan both sides of the pair together.

No for the main CPU rack. The CRU320 must run in an RX3i Universal backplane. Series 90-30 expansion racks may be used where the documented RX3i system architecture supports them, but they do not replace the required Universal backplane.

GE specifies a maximum of one logic scan, with a 3.133 ms minimum. Actual behavior depends on scan time, configured transfer data, I/O and network design, so the complete application should be reviewed rather than quoting only the minimum value.

The CPU provides RS-232 and RS-485 serial ports. Ethernet is added with an IC695ETM001 in the rack; redundancy synchronization uses the RMX modules. Verify the installed Ethernet or PROFINET hardware and supported firmware separately.

Provide clear nameplate photos, the complete suffix, both CPU and RMX firmware levels, rack and power-supply details, transfer-list size, network modules, failure symptoms, quantity and destination. These details reduce the risk of receiving a visually similar but incompatible revision.