What does the instrument logic in the dashed box in the diagram mean?
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The process is Dalian University of Technology’s low-temperature methanol washing; please explain the instrument logic indicated by the dashed boxes in the diagram.
It can be seen that the interlock signals are present; these valves operate separately – is there any logic to it? The interlock logic should be at the front
Pid has a homepage image; just follow the explanation
This is a PID diagram, which can only be used as a reference when analyzing logic; the logic cannot be directly obtained from it. .
The logical value I under IS0501 is sent to HC-05003, HY-035003A, HY-035003B, HY-035003C, and HY-035003D. HC-05003 sends it directly to HV-05003A, thereby triggering the operation of HV-05003A; it is also sent to solenoid valves such as HY-035003A, HY-035003B, HY-035003C, and HY-035003D, determining the position of these solenoid valves in an emergency situation. HV-035003A, HV-035003B, HV-035003C, and HV-035003D each have open and closed status signals for display.