Typical solutions for urban sewage pumping stations
In order to reduce operating costs and improve the modernization and informatization level of enterprises, the urban pumping station water supply monitoring system based on Hollysys LK series PLC is mainly composed of monitoring configuration software HollyView, high-speed data communication network (VPN) and PLC system. Partial composition. The concept of system composition is based on an open, modular structure, and enables the system to flexibly and conveniently implement complex programming and configuration tasks.
According to the requirements of the urban pumping station water supply monitoring system, and fully considering the requirements of the system's high reliability, practicability, convenience, maintainability and expandability, the control operation of the entire pumping station water supply scheduling system has been realized. Real-time, accuracy, completeness and uniformity of data collection and information. The whole system is divided into upper computer monitoring layer, PLC control layer, field instrument layer and communication network.
Schematic diagram of urban sewage pumping station automation system
Central monitoring center (upper monitoring layer)
The central control center is located in the system main control center and is the core of the entire pumping station automation information system. It is responsible for managing the database and production process scheduling of the entire monitoring system. The field control station transmits the data information to the monitoring computer through the communication network, and the system can automatically complete the data storage, display, analysis, alarm, and sharing. At the same time, the main control center and the system sub-control center work separately to control the on-site pumping station, and they are standby for each other.
PLC control station (field control layer)
The system is equipped with a control station at each pump station, which is responsible for the automatic monitoring and control of the operation of each on-site pump station. PLC control station includes control cabinet, LK series PLC controller, various I / O modules, operation touch screen, video monitoring equipment, etc.
Field Instrumentation Layer
The field instrument layer is located at the bottom of the system and is the data source of the entire system. It mainly includes various instruments for collecting field data, responsible for data collection, display, alarm, and transmission to PLC control station and central monitoring center.
The system communication network is the key to achieving system uniformity, stability, security, and integrity, and is the basis for achieving system functions. For this application, we use VPN (Virtual Private Network) technology to combine each pumping station and monitoring center into a virtual local area network. The pumping station using this transmission method can both implement data transmission and monitor image transmission.