Model Interpretation

IC695: PACSystems RX3i PLC series

CRU: Control Redundancy Unit 

320: High-end 1 GHz performance, redundancy-enabled

Technical Parameters

Processor & Performance

CPU: Intel Celeron M (32-bit) @ 1.0 GHz

Boolean Speed: 0.047 ms / 1K bool instructions

User Memory: 64 MB battery-backed RAM + 64 MB flash NVRAM

Program Blocks: Up to 512 blocks, max 128 KB/block

I/O Capacity:

Discrete: 32K bits (%I/%Q)

Analog: Configurable up to 32K words (%AI/%AQ)

Redundancy Switchover: Min 3.133 ms, max 1 logic scan

Communication

Onboard Ports:

Port 1: RS-232 (SNP slave, Modbus RTU slave)

Port 2: RS-485 (SNP, Modbus RTU, Serial I/O)

Backplane: Dual bus (RX3i PCI + high-speed serial)

Network: Ethernet via rack-mounted modules (no onboard LAN)

Electrical

Power: +3.3V @ 1A, +5V @ 1.2A (from RX3i backplane)

Battery: Lithium battery for RAM retention (replace every 3–5 years)

Mechanical & Environmental

Dimensions (W×H×D): 40 × 100 × 160 mm (2 slots wide)

Weight: ~1.0 kg

Operating Temp: 0°C to +60°C

Storage Temp: -40°C to +85°C

Humidity: 5–95% non-condensing

Certifications: UL, CE, CSA

Internal Resources

Floating-Point Math: Supported

Real-Time Clock (RTC): ±2 sec/day max drift

Diagnostic LEDs: CPU OK, RUN, Outputs Enabled, I/O Force, Battery, Sys Flt, COM1/COM2

Core Functions

Hot-Standby Redundancy: Pairs with IC695RMX128 memory exchange module for real-time data sync; failover in <100 ms.

High-Speed Logic Execution: Complex ladder logic, function block, and C programming support.

Large-Scale I/O Control: Manages up to 32K discrete and 32K analog points for mid-to-large systems.

Dual Serial Communication: Connects to HMI/SCADA, programming tools, and Modbus devices simultaneously.

Data Integrity: Battery-backed RAM + non-volatile flash protects programs/data during power loss.

Applications

Critical Process Control: Oil/gas, chemical, pharmaceutical (zero downtime required)

Power & Utilities: Power plants, water treatment, pump stations

Manufacturing: Automotive assembly, packaging lines, material handling

Infrastructure: Airport systems, rail control, building automation

OEM Equipment: High-reliability machinery with redundancy requirements

Usage & Maintenance

Installation: Requires 2 adjacent RX3i backplane slots (e.g., IC695CHS012/016).

Redundancy Setup: Pair two CRU320 CPUs with one RMX128 module for master-standby configuration.

Programming: Use Proficy Machine Edition (v9.0+).

Battery Replacement: Replace every 3–5 years to prevent data loss.

Compatibility: Works with all RX3i I/O modules; not compatible with Series 90-30/90-70.

Key Differences from IC695CPU320

CRU320: Redundancy-enabled (hot-standby), 2 slots, paired with RMX128

CPU320: Standard non-redundant, 1 slot, lower cost for non-critical systems