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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. 

 

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