※此閘 (AND) 有兩個?入口 (E1,E2)，兩個皆要輸入信號，出口 (A) 才會產生信號，用於邏輯及保險迴路。
This valve (AND) has two inputs inlets (E1,E2), Both positions must be activated to product output signal (A).
It can be used in logic circuit and safety circuit.