GE IC695CRU320-EZ PACSystems RX3i Redundancy CPU

The PACSystems* RX3i Redundancy CPU can be used to 

perform real time control of machines, processes, and 

material handling systems. The CPU communicates with the 

programmer and HMI devices via a serial port using SNP 

Slave protocol. It communicates with I/O and smart option 

modules over a dual backplane bus that provides: 

▪ High-speed PCI backplane for fast throughput of new advanced I/O. 

▪ Serial backplane for easy migration of existing Series 90*-30 I/O. 

Features 

▪ Hot standby (HSB) redundancy. Two redundant units 

make up a redundancy system. Each unit requires one 

Redundancy CPU (IC695CRU320) and a redundancy 

Memory Xchange module (IC695RMX128/228) configured as a redundancy link. 

▪ Contains 64 Mbytes of battery-backed user memory and 

64 Mbytes of non-volatile flash user memory. 

▪ Provides access to bulk memory via reference table %W. 

▪ Configurable data and program memory. 

▪ Programming in Ladder Diagram, Structured Text, 

Function Block Diagram, and C. Refer to PACSystems RX7i 

& RX3i CPU Programmer’s Reference Manual, GFK-2950. 

▪ Supports auto-located Symbolic Variables that can use 

any amount of user memory. 

▪ Reference table sizes include 32Kbits for discrete %I and 

%Q and up to 32K words each for analog %AI and %AQ. 

▪ Supports most Series 90-30 modules and expansion 

racks. For a list of supported I/O, Communications, 

Motion, and Intelligent modules, refer to the PACSystems 

RX3i System Manual, GFK-2314F or later. 

▪ Supports up to 512 program blocks. Maximum size for a block is 128KB. 

▪ CPU firmware may be upgraded in the field. 

▪ CPU supports firmware upgrades of modules in its backplane. 

▪ Two serial ports: an RS-485 serial port and an RS-232 serial port. 

▪ Ethernet communications via the rack-based Ethernet 

Interface module (IC695ETM001). For details on Ethernet 

capabilities, refer to PACSystems RX7i & RX3i TCP/IP 

Ethernet Communications User Manual, GFK-2224. 

▪ Time Synchronization to SNTP Time Server on Ethernet 

network when used with Ethernet Release 5.0 or later. 

▪ Compliant with EU RoHS Directive 2002/95/EC using the 

following exemptions identified in the Annex: 7(a), 7(c)-I, & 7(c)-III.

Hot Standby CPU Redundancy Features 

For details on the configuration and operation of a Hot Standby CPU redundancy system, refer to the PACSystems 

Hot Standby CPU Redundancy User’s Manual, GFK-2308. 

▪ Supports single and redundant Ethernet remote I/O LANs through Ethernet Network Interface Unit (ENIU) 

modules 

▪ Supports simplex and redundantly controlled PROFINET remote IO (requires firmware version 8.00 or later) 

▪ Survives any one single point of failure 

▪ Bumpless switching 

o Synchronized CPUs 

o One scan switching 

o Transfer data size up to 2Mbytes; selected in CPU hardware configuration and in variable properties 

▪ Supports two redundancy communications links 

▪ Online repair of failed component 

▪ Online programming 

▪ Redundancy Memory Xchange Module 

o Manual toggle switch for role switching, which transitions control from the active unit to the backup unit 

o Redundancy status LEDs  

▪ Application-initiated role switching to switch the active unit to backup status 

▪ Redundancy status bits and message logging 

▪ Memory error checking and correction (ECC) single bit correcting and multiple bit checking 

▪ Background diagnostics