The human-machine interface (mainly the operation station) crashes all DCS exist to varying degrees, only with different degrees of frequency. It is also related to the length of time that DCS is used. Crash caused by hardware, showing that it can no longer recover. If the power supply voltage of the operation station is low, it is easy to make the operation station crash. The crash caused by the inappropriate selection of the speed of the software and communication connection can still be recovered after a period of time. The operation system of the operation station and the monitoring software are not well run-in, which can also cause a crash, and there is no way to protect the personnel, which is called a primary crash. The crash is caused by network blockage caused by some unreasonable configurations, too small memory, etc., and you can recover after a few minutes.
DCS HMI crashes
Recently, the MIS system needs to read real-time data from the DCS. In the case of a large number of data reads (such as 3000 points), because DDE consumes more resources, the network congestion phenomenon becomes very frequent, and the node crash phenomenon of various human-machine interfaces becomes severe. The severity of network congestion is related to a variety of factors. If the data is less than 500 points, the problem is not too big. If you take a few thousand points of data, it is almost certain that the operation station will crash. If the node is connected to the communication network of the DCS, the data is retrieved from the network interface, and the situation is better.
The controller sends the data to the interface, and the human-machine interface reads the data from the network interface in accordance with the network communication protocol. There are two types of network physical structures: ring type and bus type, and the bus network is also logically ring. Star networks are only used for small systems (within 100 I/O points). As long as the node on the network sends data to the network, it must continuously broadcast data, and the node that needs the data will accept the data. In addition to this method, there is also a method for the network of broadcast protocols: one node interrogates data to other nodes on the network, and if other nodes do not have it, it repeatedly interrogates until it reads this data. If there is no such data on the network, it will cause network congestion. In order to make the operator proficient in the operation of the DCS operation station, the simulation system can be selected to understand the DCS keyboard to reduce the crash caused by misoperation; You can also know the crash status of the operator station. In the case of a long DCS running time, the configuration is only added and not subtracted, and some configurations are actually not connected to the real I/O points and have nothing to do with control. Another issue that should be noted is that when accessing the dynamic data server, you should check whether the software version of all interfaces is common, otherwise the data transfer will be affected.
If the exception method is chosen, the area of the exception can be enlarged to reduce network traffic. An exception statement is when data is sent to the network at a point in the field only when changes occur. In order to prevent the point from being broken and the human-machine interface is unknown, even if the point does not change, it must be stated beyond a certain time. In order to reduce the amount of traffic on the network, the intention of reducing the amount of data can also be achieved by appropriately increasing both parameters of the exception statement.
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