Here are the core technologies used in the IC695CRU320CA-EL (RX3i Redundancy CPU):
Processor & Compute Core
1 GHz, 32‑bit Intel Celeron‑M processor for real‑time control logic execution.
64 MB of battery‑backed RAM + 64 MB of non‑volatile Flash user memory; memory sizes are configurable.
ECC (Error Checking and Correction) on memory: single‑bit correction, multi‑bit detection for reliability.
Backplane & Bus Architecture
Dual backplane bus:
High‑speed PCI backplane (compliant with PCI 2.2) for fast advanced I/O and smart modules.
Serial backplane for easy migration of existing Series 90‑30 I/O.
Hot Standby (HSB) Redundancy Technologies
Hot Standby Redundancy: two redundant units (each using IC695CRU320 plus a Redundancy Memory Xchange module IC695RMX128) form a redundancy system.
Bumpless switchover with synchronized CPUs; switchover time is maximum one logic scan, minimum 3.133 ms.
Supports up to two redundancy links; up to 2 MB of transfer data can be synchronized between units.
Survives any single‑point failure, supports online repair and online programming; includes role switching via manual toggle or application initiation, with redundancy status bits and message logging.
Embedded Communications & Networking
Two serial ports:
RS‑232
RS‑485
Supported protocols include Modbus RTU Slave, SNP Slave, and Serial I/O.
Ethernet communications via a rack‑based Ethernet Interface module (e.g., IC695ETM001); details in GFK‑2224.
SNTP time synchronization over Ethernet when used with a compatible Ethernet module.
Supports single and redundant Ethernet remote I/O LANs via Ethernet Network Interface Unit (ENIU) modules.
Firmware & Programmability
Firmware is in‑system upgradeable; release history documents upgrades up to version 6.02.
Programming languages: Ladder Diagram, Structured Text, Function Block Diagram, and C.
Supports up to 512 program blocks (max 128 KB per block); auto‑located symbolic variables; reference table sizes: %I/%Q 32 Kbits, %AI/%AQ up to 32 Kwords each; symbolic up to 64 MB.
Design & Environment
Operating temperature: 0 to 60 °C (standard); for the extended‑temperature / conformal‑coat variants, consult factory. The –EL suffix commonly denotes the extended‑temperature option.
Flash endurance: minimum 100,000 write/erase cycles.

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