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The GE IC695RMX128 is a Redundancy Memory Xchange Module for the PACSystems RX3i series of Programmable Logic Controllers (PLCs). Its main purpose is to provide a high-speed, dedicated link between CPUs in a hot standby CPU redundancy system. It can also function as a node on a reflective memory network.
Key Features and Specifications
- Redundancy Link: The IC695RMX128 is specifically designed to enable bumpless transfer in a redundant PLC system. It provides a path for the primary and standby CPUs to continuously transfer and synchronize data. This ensures that if the primary CPU fails, the standby CPU can take over immediately without any interruption to the process being controlled.
- Shared Memory: The module features 128 MB of user-shared memory (SDRAM). When used in a reflective memory network, any data written to this memory on one node is automatically and immediately replicated across all other nodes on the network.
- High-Speed Fiber Optic Network: The module uses a high-speed 2.12 Gbaud fiber optic network for communication. This provides extremely fast data transfer and, importantly, offers immunity to electrical noise, making it ideal for electrically noisy industrial environments.
- Network Compatibility: It is compatible with the VMIC 5565 family of reflective memory devices. A reflective memory network can support up to 256 nodes in a daisy-chained loop using fiber optic cables.
- Software Configuration: All node parameters are configured via software, eliminating the need for physical jumpers or switches.
- Hot Swap Capability: The module supports hot insertion and extraction, which means it can be replaced while the system is powered, minimizing downtime during maintenance.
Applications
The IC695RMX128 is a crucial component in mission-critical applications where system failure is not an option. It is used in:
- Hot Standby CPU Redundancy Systems: The most common application, where it provides the high-speed data link between a primary and a backup CPU to ensure uninterrupted operation.
- High-Speed Data Sharing: In non-redundant configurations, it can be used to provide deterministic data sharing among multiple PLCs and other computing devices on a high-speed fiber optic network.
- Distributed Control Systems: For large-scale applications where different parts of a process are controlled by separate PLCs that need to share common data in real-time.
