The PPC907BE101 3BHE024577R0101 can collect corresponding field signals and control certain local devices
Brand ABB height 27mm rated current 150mA
Protection level adapted to motor power Applicable site Material code
IP45 28KW Power industry HIEE401782R0001
Part number PPC907BE101 3BHE024577R0101 Applicable pipe whether imported is 1.7kg can be sold nationwide
The PPC907BE101 3BHE024577R0101 can collect corresponding field signals and control certain local devices
Data integration is the key in dcs system. A typical DCS system can be divided into four layers structurally [1] : field level, control level, monitoring level and management level. This paper discusses the monitoring level, in this level there are many parallel sub-stations, generally using the computer as the machine interface, each station can be divided according to the function, respectively collect the corresponding field signal and control some local equipment. However, the sites are not isolated from each other, and they must cooperate and coordinate with each other to ensure product quality and achieve continuous production, which requires the sites to communicate. In addition, the superior management network also needs to exchange data with the monitoring sub-stations to achieve global monitoring and optimization.
However, the sub-station is a heterogeneous system composed of different development platforms and different communication protocols, which may be developed by different manufacturers and individuals. Writing a translation interface or driver for each protocol can be tedious, especially when there are many sites and protocols. Therefore, how to integrate data effectively and avoid the appearance of information island is one of the difficult problems often encountered in DCS system.
A better approach is that each site uses standard protocols for data communication, rather than having to develop a communication interface for each protocol. At present, there are many protocols in this area, and Modbus is one of them.
The Modbus protocol includes ASCII, RTU, PLUS, TCP, etc., and does not specify the physical layer. This protocol defines the message structure that controllers can recognize and use regardless of the network over which they communicate. [2] Standard Modicon controllers implement serial Modbus using RS232C. RS232C specifies the connector pin, wiring, signal level, baud rate, parity check and other information, and Modbus ASC water and RTU protocols specify the message, data structure, command and answer mode on this basis, as shown in Figure 1. Data communication adopts Maser/Slave mode, the Master side sends data request message, and the Slave side can send data to the Master side to respond to the request after receiving the correct message; The Master can also directly send messages to modify data on the Slave end to implement two-way read and write.
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The PPC907BE101 3BHE024577R0101 can collect corresponding field signals and control certain local devices
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