情境
A sump pump must run periodically under 24V relay control, starting on high-level float or manual test and repeating on/off cycles until the float clears.
這張圖裡有什麼
看懂背後的決策。
01
Use a parallel OR branch to let the manual test button or high-level float trigger the cycle
02
Deploy a TON pump-on timer and a recycle off timer with an RES instruction to retrigger the cycle
03
Keep the pump relay coil as a discrete output after the on-timer done bit
Use for small sump or bilge pump applications with 24V control relays where an automatic recycle timer reduces short cycling and adds manual test capability.