Basic PLC Ladder Programming Training Examples for Beginners.
Hi friends here we are starting here a series of Free Training on PLC Ladder Programming training & tutorials. These PLC Ladder Programs are important to get basics of Ladder programs.
PLC Ladder Practice Problem:
Enabling the indicator to be ON after a 5 sec delay and OFF after a 3 sec delay by the switch.
Topics Covered in this example is PLC Timer (ON Delay & OFF Delay).
Number of PLC Inputs Required
X1 – Start Switch.
Number of PLC Outputs Required
Y1 – Output Indicator
Number of PLC Timer Required
T0 – 5 second Timer, 100 ms Time Base. (See K50 Preset Value for Timer)
T1 – 3 second Timer, 100 ms Time Base. (See K30 Preset Value for Timer)
PLC Ladder Programming:
PLC Ladder Program Description:
· When X1 = ON, T0 will start counting for 5 sec. When T0 reaches its set value, the NO contact T0 will be ON while NC contact T1 will remain OFF, which
makes the indicator Y1 to be ON and latched.
· When X1 = OFF, T1 will start counting for 3 sec. When T1 reaches its set value, the NC contact T1 will be activated while the NO contact T0 will remain
OFF, which makes the indicator Y1 to be OFF.
Note: Example is only for training purposes. No practical implementation is done. See More PLC Ladder Programming Examples