Seeking help with the interlock logic related to control valves
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The project involves circuits with interlocked control valves; specifically, when the temperature at the bottom of the furnace reaches the level corresponding to the first-level alarm, valve 1 is forced to open to 80% of its capacity. At the second-level alarm, valve 1 is closed completely, and simultaneously valve 2 is also closed completely. How can I create a logic to force the valve to open to 80%, and how should I draw that? Both of these valves are control valves and do not come with solenoid valves. Please ask Haiyou for support.
The control of a control valve with a set opening requires two aspects: one is to switch the control function to manual mode, and the other is to provide the corresponding output value through the AO channel.