3. Three indicator lights PL1, PL2, and PL3 are controlled with two pushbutton (i.e. momentary) output and a ladder logic program for operating the indicators are shown below. PB1 is normally closed and PB2 is normally open for switches PB1 and PB2.
The I/O diagram:
The Ladder Logic Program:
(a) Initially neither switches are activated. Describe what happens to the indicator lights PL1, PL2 and PL3.
(b) Step 1: press the switch PB2. Describe what happens to the indicator lights PL1, PL2 and PL3.
(c) Step 2: release the switch PB2. Describe what happens to the indicator lights PL1, PL2 and PL3.
(d) Step 3: the switch PB1 is pressed. Describe what happens to the indicator lights PL1, PL2 and PL3 before releasing PB1.
3. Three indicator lights PL1, PL2, and PL3 are controlled with two pushbutton (i.e. momentary)…
3. Three indicator lights PL1, PL2, and PL3 are controlled with two pushbutton (i.e. momentary) output and a ladder logic program for operating the indicators are shown below. PB1...
