PID - Describe based on the diagram
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Hello, experts. Could you please help with this image? Thank you for your reply.
1. When the limit switch of the valve above is closed, XZSC12000 sends no signal; meanwhile, the limit switch XZSO12000 sends a signal, and the control system indicates that the valve is open； 2. When two out of the following three conditions are met simultaneously – the valve limit switch XZSC12000 sends a signal indicating that the valve is closed, the valve limit switch XZSO12000 does not send any signal, and the valve transmitter XZL12000 indicates a value of no more than 80% – the control system displays that the valve is closed ； 3. The arrow should be a signal indicator that can be referenced elsewhere.