Hebei Fangyuan tells you what the DCS system

First of all, the backbone of the DCS - the system network, which is the basis and core of the DCS. Since the network plays a decisive role in the real-time, reliability, and expandability of the entire DCS system, all manufacturers have carefully designed this aspect. For the DCS system, it must meet the requirements of real-time, that is to complete the transmission of information within a certain time limit. The â€œdeterminedâ€ time limit mentioned here means that in any case, information transmission can be completed within this time limit, and this time limit is determined according to the real-time requirements of the controlled process. Therefore, the measure of system network performance is not the rate of the network, which is usually referred to as the bits per second (bps), but the real-time nature of the system network, that is, how long it takes to ensure that the required information is transmitted. . The system network must also be very reliable. In any case, network communications cannot be interrupted. Therefore, most manufacturers' DCS systems use dual bus, ring, or dual star network topology. In order to meet the requirements of system scalability, the maximum number of nodes that can be accessed on the system network should be several times larger than the number of nodes actually used. In this way, on the one hand, new nodes can be added at any time. On the other hand, the system network can also be operated in a lighter communication load state to ensure the real-time and reliability of the system. During the actual operation of the system, the online and offline network of each node may occur at any time, especially the operator station. In this way, network reconfiguration will be performed frequently, and this operation must not affect the normal operation of the system. Therefore, the system The network should have strong online network reconstruction capabilities.

Second, it is a network node that completely handles on-site I/O processing and implements Direct Digital Control (DOS) functionality. In general, a set of DCS systems must be equipped with on-site I/O control stations to share the I/O and control functions of the entire system. In this way, the failure of a single site can prevent the failure of the entire system and improve the reliability of the system. It also enables the sites to share data collection and control functions, which is conducive to improving the performance of the entire system. The DCS operator station is a network node that handles all HMI-Human Machine Interface (or operator interface) functions associated with operation operations.

The system network is an engineering station of DCS. It is a network node that performs offline configuration, configuration work, and online system supervision, control, and maintenance of DCS. Its main function is to provide tools for configuring and configuring DCS. That is, the configuration software) and monitors the operation of each node on the DCS network in real time while the DCS is running online, enabling the system engineer to adjust the system configuration and the setting of some system parameters in time through the engineer station, so that the DCS can be at the best at any time. Working condition. Unlike a centralized control system, all DCSs require a system configuration function. It can be said that a system without a system configuration function cannot be called a DCS.

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