PACSystems RX3i Redundancy CPU

The PACSystems RX3i Redundancy CPU is designed for real-time processing and discrete automation across a wide range of industrial applications. It communicates with programming software and HMI devices via the serial SNP Slave protocol, and interfaces with I/O and intelligent option modules through a dual backplane architecture, providing both performance and backward compatibility:

High-speed PCI backplane for fast data throughput with advanced I/O modules

Serial backplane to support seamless migration of existing Series 90-30 I/O

Key Features

Hot Standby (HSB) redundancy
A redundancy system consists of two identical units. Each unit requires:

One Redundancy CPU (IC695CRU320)

One Redundancy Memory Xchange module (IC695RMX128) configured as the redundancy link

Memory architecture

64 MB battery-backed user memory

64 MB non-volatile flash user memory

Fully configurable program and data memory allocation

Programming capabilities

Supports Ladder Diagram (LD), Structured Text (ST), Function Block Diagram (FBD), and C

Auto-located Symbolic Variables with flexible use of available user memory

Reference memory capacity

32 Kbits each for discrete %I and %Q

Up to 32 Kwords each for analog %AI and %AQ

Module compatibility

Supports most Series 90-30 modules and expansion racks

Refer to the PACSystems RX3i System Manual (GFK-2314) for a complete compatibility list

Program structure

Supports up to 512 program blocks

Maximum block size: 128 KB

Firmware

In-system firmware upgrade capability

Communication interfaces

Two built-in serial ports:

One RS-485

One RS-232

Ethernet communication supported via rack-based Ethernet Interface module (IC695ETM001)

Refer to TCP/IP Ethernet Communications for PACSystems User’s Manual (GFK-2224) for details