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The GE IC695NIU001 is a Network Interface Unit (NIU) for the PACSystems RX3i series of Programmable Logic Controllers (PLCs). Its primary function is to enable a remote RX3i backplane to communicate with a main PLC system via a high-speed serial network, effectively acting as an intelligent remote I/O head.
Key Features and Specifications
- Remote I/O Interface: The NIU allows a rack of RX3i modules to be located remotely from the main CPU, which could be an RX3i, PACSystems RX7i, or other GE PLC. This is a crucial feature for applications with geographically dispersed I/O points.
- Built-in Local Logic: A key differentiator of the IC695NIU001 is its 20K of local logic. This allows it to perform a certain amount of processing and control at the remote location without needing to constantly communicate with the main PLC. This reduces network traffic and can be used for critical functions that require a faster response.
- Dual Serial Ports: The module includes two built-in serial ports that support RS-232, RS-485, and RS-422 communication. These ports are used to connect to the main PLC’s communications module, enabling the remote I/O connection.
- Data Exchange: The NIU provides a seamless data pathway for the main PLC to read inputs and write outputs to the remote I/O modules, making the remote modules appear as if they are in the local rack.
- Hot Swap Capability: Like other RX3i modules, it supports hot insertion and extraction, which means it can be replaced while the system is powered, minimizing downtime.
Applications
The IC695NIU001 is an essential component for building distributed control systems. It is commonly used in:
- Large-Scale Systems: Applications with a large number of I/O points spread out over a wide area, such as in factories, pipelines, or water treatment plants.
- Remote Monitoring and Control: To interface with equipment located in remote buildings or at a distance from the main control room.
- Cost-Effective Expansion: It provides a more economical solution for adding I/O compared to running long, individual wires from each sensor and actuator back to the main PLC rack.
