需求
“A valve start-stop seal-in rung with a start button and valve auxiliary contact in parallel, a normally closed stop button, and a valve command output coil.”
接著試試Add a valve open limit contact.Change the output to a pump command.
這張圖裡有什麼
看懂背後的決策。
01
Use of seal-in contact to maintain state after button release
02
Normally closed stop button for fail-safe operation
This pattern applies to any motor, valve, or actuator that requires a maintained run signal from momentary pushbuttons.