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GE IC695CRU320 PACSystems RX3i Redundancy CPU Module

Model: IC695CRU320

Brand: GE Fanuc / Emerson

Series: PACSystems RX3i Programmable Automation Controller

Core Function: Hot-Standby redundant controller CPU for high-availability industrial control systems, executing real-time control logic and supporting bumpless switchover between primary and standby CPU racks.

Product Type: Redundant Processor Module

Key Specifications: 64MB battery-backed RAM, 64MB flash memory; dual serial ports (RS232 / RS485); dual backplane bus (PCI + Serial); requires IC695RMX128 redundancy sync module; supports multiple IEC programming languages.

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Description

GE IC695CRU320 is a dedicated redundancy CPU designed for the PACSystems RX3i platform. It enables hot standby redundant architecture for mission-critical automation applications. Two IC695CRU320 CPUs form a redundant pair, synchronized via fiber-connected IC695RMX128 memory exchange modules. Upon primary CPU failure, the standby unit takes over control within one logic scan to achieve bumpless process switchover without production interruption. The module supports mixed use of modern RX3i PCI I/O and legacy Series 90-30 serial I/O modules, widely deployed for replacement spare parts in power, water, oil & gas and process plants.

Series

PACSystems RX3i is a modular programmable automation controller family developed by GE Intelligent Platforms, later transferred to Emerson. The platform includes standard CPUs, redundancy CPUs, communication modules and universal I/O modules, supporting centralized and distributed control architectures with flexible redundancy options.

 

Product Features

  1. Purpose-built for hot standby (HSB) redundant control configurations; works in pairs with IC695RMX128 fiber sync modules.
  2. 64 MB battery-backed user memory and 64 MB nonvolatile flash memory for program and data storage.
  3. Dual embedded serial interfaces: RS232 and RS485, supporting SNP, Modbus RTU Slave and Serial I/O protocols.
  4. Dual backplane architecture: high-speed PCI bus for RX3i I/O and serial backplane for legacy Series 90-30 I/O migration.
  5. Supports IEC standard programming languages: Ladder Diagram, Structured Text, Function Block Diagram and C language.
  6. Bumpless switchover; maximum switchover time less than one logic scan (minimum 3.133 ms).
  7. Front panel LED indicators for power, run status, fault diagnostics and redundancy synchronization status.
  8. Single-slot module mounting on RX3i universal backplane; compatible with Machine Edition engineering software.
  9. End-of-life legacy hardware; not recommended for new project design.

Product Parameters

Item Details
Part Number IC695CRU320
Brand GE Fanuc / Emerson
Series PACSystems RX3i PAC
Memory 64 MB battery-backed RAM, 64 MB flash memory
Embedded Ports 1 × RS232, 1 × RS485
Supported Protocols SNP, Modbus RTU Slave, Serial I/O
Redundancy Accessory IC695RMX128 / IC695RMX228 fiber memory exchange module
Backplane Interface PCI bus + Serial backplane
Power Draw +3.3 VDC: 1.0 A; +5 VDC: 1.2 A nominal
Operating Temperature 0℃ ~ +60℃
Storage Temperature -40℃ ~ +85℃
Humidity 5–95% RH, non-condensing
Discontinued Status Obsolete, spare-part only

 

Product Specifications

  • Installation: Single slot on RX3i universal backplane
  • Certification: CE compliant
  • Remark: Redundancy system requires two separate racks and matched fiber sync modules; firmware version must be consistent for paired CPUs.

 

Function

  • Execute user control programs and real-time closed-loop logic for industrial processes.
  • Synchronize runtime data, I/O status and internal variables between primary and standby CPU via redundancy link.
  • Exchange input/output data with local and remote I/O modules through dual backplane buses.
  • Perform automatic bumpless switchover when primary CPU encounters hardware or communication faults.
  • Communicate with HMI, programming tools and third-party serial devices via built-in serial ports.
  • Upload module diagnostic information, fault logs and redundancy status to supervisory systems.

 

Purpose

High-availability redundant CPU controller for PACSystems RX3i automation systems, deployed to eliminate single points of failure in critical continuous-process industrial applications.

 

Application Fields

  • Thermal power plant auxiliary control system maintenance
  • Oil & gas onshore production automation retrofit
  • Water & wastewater treatment plant high-reliability control
  • Petrochemical continuous process spare-part replacement
  • Legacy GE PACSystems RX3i redundant control site equipment maintenance

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