Chapter 6, Problem 3P

Program Plan Intro

Ladder logic program:

The above ladder logic program includes three inputs namely, I/1, I/2 and I/3, three rungs namely, Rung 1, Rung 2 and Rung 3, two pilot lights namely, PL1 and PL2 and two outputs namely, O/9 and O/10.

Explanation of Solution

b.

Condition for unlatch rung 2:

• When the input I/3 is set as true or ON state, the unlatch rung 2 is termed as active or in true state...

Explanation of Solution

c.

Condition for rung 3:

• When the input O/9 in Rung 3 is set as zero or low, the rung 3 is termed as active.
• When the input I/3 in Rung 2 is set as true, the output of Rung 2 will be reset as zero...

Explanation of Solution

d.

State of Pilot Light PL1:

• The ON state of pilot light PL1 represents that the output bit O/9 is in high state.
• This can be occurred when the relay in latched state is set to the bit 1...

Explanation of Solution

e.

State of Pilot Light PL2:

• The ON state of pilot light PL2 represents that the input bit I/3 is true in Rung 2...

Explanation of Solution

f.

Pilot Light used when the power is restored:

AC power is removed and restored through the circuit, the relay retains to its original state, n...

Explanation of Solution

g.

Inputs required for unlatched state:

• The relay is in latched state and the inputs I/1, I/2 and I/3 are false.
• To convert the relay state from latched to unlatched,...

Explanation of Solution

h.

State of the relay:

• The Programmable Logic Controller (PLC) executes the instructions according to top to bottom approach.
• When the closed instructions at I/1, I/2 and I/3 are termed...