The sequencer shown advances its position whenever:
A)S1 makes a false-to-true transition.
B)S2 makes a false-to-true transition.
C)the PLC is in the run mode.
D)either S1 makes a false-to-true transition or S2 makes a false-to-true transition.

Question

The sequencer shown advances its position whenever: 
A)S1 makes a false-to-true transition. 
B)S2 makes a false-to-true transition. 
C)the PLC is in the run mode. 
D)either S1 makes a false-to-true transition or S2 makes a false-to-true transition.

Quizplus · Accepted Answer

The sequencer is connected to both S1 and S2, and is configured to advance its position whenever either one of them makes a false-to-true transition. The PLC being in run mode is not relevant to the operation of the sequencer.

The Sequencer Shown Advances Its Position Whenever