How is a PLC transmitted to a DCS via OPC, and what devices are required for the communication between them?
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Dear seniors, I’ve recently been assigned a DCS modification project that involves communication between the DCS and PLCs. I plan to have the PLC transmit data to the DCS using OPC software, but I’m not quite clear on how this communication will take place or what devices are required. I would be very grateful if you could offer some guidance. Thank you so much!
An OPC server is required, with Ethernet communication
So how is communication transmitted between them, and what devices are needed?
So how is communication transmitted between them, and what devices are needed?
So how is communication transmitted between them, and what devices are needed?
Based on my experience, a computer is needed, along with an OPC software package and a configuration software package. PLC data is retrieved using configuration software, while OPC software serves as an intermediate bridge to facilitate communication between them. Of course, a VPN network also needs to be implemented within the intranet. If it needs to be accessed over the public internet, a fixed IP is required; setting up a virtual VPN server makes things even more complicated
OPC involves data transmitted through an upper-level computer; you just need an OPC server that can connect to both the PLC and the DSC simultaneously, with the rest being matters of software configuration.
The projects carried out in the past were located at great distances, and fiber optic communication was used; for reference: communication between DCS and PLC, with PLC data transmitted to the DCS for monitoring. There is one switch for each of DCS and PLC, and optical cables are used; the communication software on the DCS side is installed and configured to receive the data.
For communication between DCS and PLC, I think you need to consult the manufacturers of DCS and PLC or review their documentation on supported communication protocols, taking into account the specific circumstances of the manufacturers and the project. The department should have experienced senior teachers, and one should seek advice from them frequently.
Why add OPC extra? Do you have any other functions? ? Which DCS still can’t communicate with a PLC these days?