Can one PID be used to control two control valves?
Thread Content
In a central control DCS, is it possible to use one PID to control two control valves, while also allowing manual control of the opening and closing of these two valves separately? There are two towers and one buffer tank on site, with hydrogen as the medium. Both of these towers are connected to this buffer tank. Now, it is desired to use a pressure transmitter located on the buffer tank to control the outlet control valves in these two towers, as well as to enable separate switching of these two control valves. Is this possible? What are the potential issues with doing so?
If you understand in detail the control circuit diagram of split-control, you will get it
For step-by-step control, the specific method depends on the software you use, but the general principle remains the same
The key is to check whether there is any relationship between the two valves; if not, it’s simple – the PID output passes through a signal distributor, with a manual operator added to each circuit
I know how to do it now; I made a complicated issue out of something simple. Thank you all~~~:)