GE CRU320 Redundancy CPU Controller Unit

Module Feature

CRU320 belongs to GE PACSystems RX3i PLC series. It is a high-performance hot standby redundancy CPU controller module designed for critical industrial control applications. This CPU supports hot standby redundant configuration, paired with RMX memory exchange module to realize seamless master/backup switchover without interruption of control logic. Equipped with large-capacity flash and battery-backed SRAM memory, supports multiple programming languages including ladder diagram, structured text and function block. It can communicate with remote I/O, HMI and upper SCADA system via Ethernet and serial port. Plug-in rack installation structure, built-in comprehensive hardware self-check function, widely used in power, petrochemical and water treatment high availability industrial control systems.

Working principle

In redundant system, two GE CRU320 CPUs run synchronously. The master CPU executes control logic and exchanges real-time data with backup CPU through RMX module. When the master CPU fails, the system automatically switches control task to backup CPU instantly to maintain continuous production control. The CPU collects I/O signals, runs user control program and outputs control instructions to field modules, and uploads real-time data and fault records to host monitoring system through communication interface.

Onboard components

32-bit main control processor, flash memory chip, battery backed SRAM memory, Ethernet communication transceiver, serial communication chip, backplane bus interface, status LED group, power management circuit, redundant synchronization circuit.

LED indicators

Power LED, run LED, active LED, fault LED, sync status LED.

Hardware self-diagnosis

Memory fault, backplane communication error, network fault, clock failure, hardware abnormality detection, records fault codes and system event logs.

Programming software

GE Proficy Machine Edition programming software for logic programming, hardware configuration, redundant parameter setup, program download, backup and firmware upgrade.

Electrical & Process Parameters

Model:CRU320 Brand:GE Device type:RX3i Redundancy CPU Module Power supply:Supplied by RX3i rack backplane Memory:Flash + battery-backed SRAM Communication:Ethernet, serial, RX3i backplane bus Protection:Hardware self-diagnosis, redundant fault switchover protection

Mechanical & Structure

Mounting:Plug-in installation on RX3i rack chassis Protection class:IP20 Housing:Flame retardant plastic module enclosure

Environmental

Operating temperature:0℃ ~ +60℃ Storage temperature:-40℃ ~ +85℃ Ambient humidity:5~95% non-condensing Certification:CE,UL compliant Status: GE original PACSystems RX3i redundant CPU controller for high-reliability PLC system

Installation

Follow ESD protection procedure before operation. Cut off rack power supply. Insert GE CRU320 CPU into the designated slot of RX3i rack, lock module firmly. Configure redundant system parameters via Proficy Machine Edition software, match RMX module. Test redundant switchover function before commissioning.

Interface

Rack backplane connector, Ethernet port, serial service port, redundant synchronization interface.

Diagnostic

CPU not running: backplane power failure or hardware fault. Redundancy sync error: RMX module abnormal or sync cable damaged. Communication interruption: network parameter error or Ethernet port fault.

Product Brief

GE CRU320 PACSystems RX3i series hot standby redundancy CPU module, plug-in rack mount, supports master-backup seamless switchover, used for high reliability industrial PLC automatic control.