Ask about the communication problem between DCS system and PLC
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There are several PLC systems that need to communicate with the DCS system, and several PLCs are distributed in several locations. These PLC systems are all equipped with the modbus protocol. Which solution is the best for communication with DCS? Please advise.
You also said that if the modbus protocol is installed, you can only use it. Just assign the address. If the PLCs are close together, modbus communication can use a ring structure. Otherwise, the DCS will need several Modbus communication ports.
If several PLCs support Modbus, it would definitely be better to add a Modbus module to the DCS for Modbus network communication - if the data size and communication distance are not very large. There is another solution. If the DCS system itself supports the Modbus protocol, that is, if the DCS configuration software can directly use Modbus or other drivers to communicate with other systems, the PLC system can be directly hung on the DCS server without going through the DCS controller.
The analysis on the third floor is correct. Just use MODBUS. Just pay attention to your communication distance and data volume.
You can choose Mosa's terminal server, which can use either serial port or Ethernet port (multiple network ports, multiple serial ports). It's easy to get through it