DCS network communication

I posted it once a couple of days ago; I don’t really understand it either, so I’m just talking casually. Please forgive any mistakes. You should post this in the control forum – perhaps the technical staff from DCS can provide you with an explanation. As those of us who handle maintenance, we don’t need to know too much about network-related things. 1. For the central control system, the IP addresses of the operation station and the control station are relatively fixed; they have little to do with the switch ports, as both are connected to the switch. The setting station for these IP addresses uses the local IP address set via a computer, while the control card uses an IP address set through a DIP switch. I’m not very familiar with the three types of networks ABC; there is Network A, Network B, and the operation network. In the older versions, there were 3 networks, which in fact corresponded to three switches. But now they have been merged, with the operation network being integrated into Network B, so there are only two switches left. 2. The optical fiber is connected to an optical fiber modem; after demodulation, it can be connected to DCS via the appropriate communication protocol. It can be done via TCP/IP or MODBUS communication; additional cards may be required. 3. The relationship between local area networks and wide area networks: in my view, a local area network is a network created by itself, while a wide area network refers to an extensive Ethernet coverage (provided by telecommunications companies); it generally does not refer to internal networks within factories. For a chemical company, there is only a local area network, no wide area network. IP has nothing to do with a local area network; it can only be said that within such a network, each user has a fixed IP address.

If you study Computer Level 3 Network Technology and pass the exam, you’ll basically understand everything; the network structure of DCS is that of a very simple small internal local area network