Q&A on Programmable Logic Controller

ELECTRICAL 0
PROGRAMMABLE
LOGIC CONTROLLERS

ELECTRICAL 1
Question 1
Here push button= Ioo (NO)
Timer1 (T1.0) = 30 seconds (off delay)
Output1= 000
Timer2 (T2.0)= 0.5 seconds (on delay)
Output2= 001
Push button= I0.1 (NC)
As per the above configuration and data, a ladder diagram can be developed
which is highlighted below:
Question 2
After understanding the given problem, the fundamental of crossing ladder
can be evaluated using the below diagram:
L1
L2
L3
L4
Outputs

ELECTRICAL 2
L5
S1
S2
Now, state transition for the given information is highlighted in the below
tabular form:
Descripti
on
≠ L1 L2 L3 L4 L5 L6 Transmissi
on line
Green
(E/W)
1 1 0 0 0 0 1 S1
Yellow
(E/W)
2 1 0 0 0 1 0 Delay
Green
(N/S)
3 0 0 1 1 0 0 Delay
Yellow
(N/S)
4 0 1 0 1 0 0 S2
The below diagram shows the connection among each light by including
transmission line:
Now, Ladder logic utilization can be represented as:
Inputs

ELECTRICAL 3
Now, General output control logic can be represented as the below figure:
First state wait for transmission can be represented as the below figure: