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In the most demanding turbine, compressor, and generator control applications, ordinary PLC CPUs simply cannot keep up. When you need deterministic 5 ms scan times on 10 000+ points, simultaneous execution of high-speed motion, hundreds of PID loops, and full redundant hot-standby failover — all while running on a plant-wide Ethernet backbone — the difference between “good enough” and genuine high-performance control shows up in megawatts, barrels per day, or grid-stability penalties.
This is exactly why GE developed the GE IC695CMU310HL — the current top-of-the-line PACSystems Rx3i Redundant CPU. This dual-core, 1.2 GHz processor with 64 MB of battery-free user memory is specifically engineered to be the primary controller in Mark VIe/Mark VIeS redundant safety-and-control systems, in large power-plant balance-of-plant installations, and in any Rx3i application where a single millisecond of delay or a single unplanned failover is unacceptable. The “HL” revision adds native support for OPC-UA server, built-in PROFINET System Redundancy (S2), and the ability to synchronize two CMU310s via a pair of fiber-optic links at 2.12 Gbaud — achieving true zero-scan-loss bumpless transfer during switchover.
Drop a pair of IC695CMU310HL CPUs into an Rx3i 17-slot rack with dual PSA350 power supplies and an RMX redundancy module and you have a control platform that rivals the old Mark VIe UCVC controller in both speed and reliability — but with the full openness of the Rx3i ecosystem: any Rx3i I/O, any PROFINET device, any third-party Ethernet/IP or Modbus TCP node, and full integration into plant historians via OPC-UA.
The GE IC695CMU310HL occupies two slots (CPU + redundancy link) in any Rx3i universal backplane. It features four independent 1 Gbps Ethernet ports (two for plant LAN, two dedicated for PROFINET I/O), dual high-speed fiber sync links, and a front USB port for program upload and firmware updates. Logic execution is fully deterministic with user-configurable task rates down to 500 µs, and the CPU supports up to 512 program blocks, symbolic variables, and C-language function blocks alongside standard ladder/FBD/ST.
In redundant mode the two CPUs synchronize data, status, and I/O forcing tables every scan via the fiber links — switchover occurs in <15 ms with zero loss of continuity. Diagnostics are exhaustive: predictive thermal monitoring, memory integrity checks, and link-health alarms appear in ToolboxST or Machine Edition before they ever affect the process. Hot-insertion of the entire CPU pair is supported, so online firmware upgrades and hardware replacement occur with no process disturbance.
- IC695CMU310HL
| Specification | Details |
|---|---|
| Model Number | IC695CMU310HL |
| Brand | GE (now Emerson/GE Vernova) |
| Type | Rx3i Redundant High-Performance CPU |
| Processor | Dual-core 1.2 GHz |
| User Memory | 64 MB (battery-free) |
| Ethernet Ports | 4 × 1 Gbps (2 plant + 2 PROFINET) |
| Sync Links | 2 × 2.12 Gbaud fiber (up to 10 km) |
| Scan Rate | Deterministic down to 500 µs |
| Operating Temp Range | -40 °C to +70 °C (extended) |
| Mounting Style | Rx3i universal backplane (2 slots) |
| Dimensions (H×W×D) | 305 mm × 60 mm × 190 mm |
| Weight | 1.4 kg |
| Compliance | CE, UL, ATEX Zone 2, Class I Div 2, IEC 61511 SIL capable |
| Supported Protocols | PROFINET S2, OPC-UA server, Modbus TCP, EGD, Ethernet/IP scanner |
| Typical Power Draw | 1.8 A @ 5 V + 1.2 A @ 3.3 V |
Choosing the GE IC695CMU310HL means you stop compromising between performance and availability. A single pair routinely replaces an entire Mark VIe UCVC rack while delivering faster scan times, open Ethernet connectivity, and far easier maintenance. Plants that once budgeted weeks of downtime for a CPU upgrade now complete the migration in a single scheduled outage. The extended temperature rating and conformal coating allow deployment in turbine-skid enclosures that would cook ordinary PLCs.
You’ll find the GE IC695CMU310HL controlling Frame 7FA/9FA combined-cycle units in redundant balance-of-plant applications, running large hydro-turbine governor and excitation systems, synchronizing multiple compressor trains on LNG plants, and providing the primary redundant controller for nuclear BOP safety-related skids. In every case the requirement is absolute determinism, zero-scan-loss redundancy, and decades of proven reliability — exactly what the IC695CMU310HL was engineered to deliver in the most critical power-generation and process applications.
IC695CPE400 – Standalone (non-redundant) rackless CPU
IC695CPE410 – Latest single-slot 2 GHz version
IC695RMX128 – Redundancy memory module (required for sync)
IC698PSA350 – 350 W supply typically paired in redundant racks
IC695PNS001 – PROFINET scanner for distributed I/O
IC695FTB001 – Fiber transceiver kit for long sync links
IC695ACC600 – Extended-temperature battery backup kit
IC695CMU310HM – Next revision (minor firmware enhancements)
Before installing a pair of GE IC695CMU310HL, verify both CPUs have identical firmware (9.80 or later) and that the fiber sync cables are genuine GE multimode with LC connectors — third-party cables can cause intermittent sync loss. Set the rack ID switches differently (0 and 1) and always install the RMX128 module in the slot immediately to the right of the primary CPU. Run the redundancy wizard in Machine Edition — it will auto-populate synchronization parameters and perform a pre-check.
In service, maintenance is predictive: the CPU reports thermal headroom and sync-link BER in real time. Firmware upgrades are performed online with automatic synchronization. Keep one pre-programmed spare pair on the shelf — online replacement takes under ten minutes with zero process impact.
