Typical application cases of sewage treatment
系列可编程控制器（ PLC ）为核心的控制系统。 The control system design of the sewage treatment plant is based on modern advanced control ideas. It adopts decentralized control, centralized monitoring and management control methods, and uses Hollysys' LK series programmable controller ( PLC ) as the core control system. 自动化控制系统应用于污水处理厂，完全能满足污水处理工艺的要求，提供了一种高可靠性、低成本、更优化的控制方案。 Based on the LK automation control system applied to the sewage treatment plant, it can fully meet the requirements of the sewage treatment process, and provides a highly reliable, low-cost, more optimized control scheme.
个中央控制室、 4个现场PLC控制站组成。 The entire system consists of a central control room and four on -site PLC control stations. 控制站，由可编程序控制器（ PLC ）系统及检测仪表组成，对污水处理厂各工艺过程进行分散控制；再由中央控制室（ CCR ），对全厂实行集中管理。 The on-site PLC control station is composed of a programmable logic controller ( PLC ) system and detection instruments, which decentralized control of each process of the sewage treatment plant; and then the central control room ( CCR ) implements centralized management of the entire plant. 控制站之间的数据通讯采用高速的、实时的工业以太网，网络结构为环形，通讯速率为100Mbps ，传输介质为光纤。 The data communication between the central control room and the PLC control station uses high-speed, real-time industrial Ethernet. The network structure is ring-shaped, the communication rate is 100Mbps , and the transmission medium is optical fiber. 个，分别位于进水泵房（ 1 ＃ PLC控制站）、变配电间（ 2 ＃ PLC控制站）、鼓风机房（ 3 ＃ PLC控制站）、污泥浓缩脱水机房（ 4 ＃ PLC控制站），均采用和利时公司LK系列PLC 。 The central control station is located in the central control room of the comprehensive building; there are 4 on-site control stations, which are located in the inlet pump room ( 1 # PLC control station), transformer substation ( 2 # PLC control station), and blower room ( 3 # PLC control station). ), Sludge concentrating and dewatering machine room ( 4 # PLC control station), all adopt Hollysys LK series PLC
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Schematic diagram of sewage treatment automation system
The entire system uses a two-level network structure, namely the production management network and the production control network. It separates real-time process data, operational monitoring data from non-real-time information and shared resource information, and uses different networks. Effectively improve communication efficiency and reduce communication load. The production management network uses industrial Ethernet, the network structure is ring, and the transmission medium is optical fiber. 国际通用的开放式现场总线，传输介质为屏蔽双绞线。 The production control network adopts the form of field bus, adopts PROFIBUS international universal open field bus, and the transmission medium is shielded twisted pair.
The control mode of the sewage treatment plant automation control system is designed to be three types of control modes: manual control of field equipment on-site, remote manual control of the automatic control system, and remote automatic control of the automatic control system. The levels of the three modes are in-place manual, remote manual, and remote automatic from high to low.