Remote PLC Monitoring
DataZen has developed a library that reads and writes data on a Beckhoff PLC over the network. This allows access to PLC data without the need to install the TwinCAT software package on the client computer. The library includes a lightweight server module which runs on the Windows CE CPU for the PLC. A client application on the client computer connects to this module over ethernet, where it can poll, read, and write data from the PLC, or additionally alert the client application when a value of interest changes.