Lcu is a control component located near the floor of hydro-generator and switch station. For data that do not have online collection conditions, manual filling and uploading of data should be provided. On-line equipment for energy consumption monitoring shall provide software configuration tools for data access and support the software configuration interfaces of the above-mentioned multiple standard communication protocols. After configuration, the online equipment for energy consumption monitoring can run the data access execution module based on SQL, OPC, Modbus, DL/T645, CJ/T 188 protocols.
Functions and features:
Lcu monitors and controls the running status of the controlled object in real time. The architecture of fieldbus network adopts two-layer network structure. The first layer is the plant-level control network, which connects LCU and plant-level computers to form a distributed computer monitoring system. The second layer is the I/O bus network, which connects the main control module and the intelligent I/O module (local or remote) to form a distributed local control subsystem.
Lcu works in "scan" mode, which cannot meet the requirements of event resolution and system clock synchronization. Interlaced scanning means that each frame is divided into two fields, and each field contains all odd scan lines or even scan lines in a frame. Usually, the odd lines are scanned first to get the first field, and then the even lines are scanned to get the second field.