I/O modules

High-Availability Control for PACSystems RX3i

The IC695CRU320-AA functions as the core redundancy CPU module in the PACSystems RX3i platform. It manages the synchronization between primary and secondary CPUs in a hot-standby architecture. This module ensures the system maintains continuous operation during a primary CPU failure. Consequently, the IC695CRU320-AA provides the foundation for applications where downtime is simply not an option . This module supports up to two IC695RMX128 synchronization links for robust data exchange .

Technical Specifications and Physical Attributes

The IC695CRU320-AA runs on a 1 GHz Intel Celeron M processor for high-speed logic execution. It provides 64 MB of battery-backed RAM for user programs and critical data, plus another 64 MB of non-volatile flash for program storage . The switchover time during a fault is minimal, taking a maximum of 1 logic scan, with a typical time of 3 to 10 ms . For communication, the module integrates two independent serial ports that support RS-232 and RS-485 standards . It requires 1.0 A at 3.3 VDC and 1.2 A at 5 VDC from the backplane . The module measures 40 mm in width and weighs approximately 0.7 kg .

Application and System Integration

This module provides a robust solution for power generation, chemical processing, and water treatment facilities . First, install the IC695CRU320-AA into slot 0 of the RX3i backplane. Then, for a redundancy setup, install a second identical CPU and connect them using the IC695CBL001 dedicated synchronization cable. Finally, the module supports the RX3i dual backplane bus (PCI and high-speed serial) for fast I/O communication . This module is essential for building a zero-downtime PACSystems RX3i control system.

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