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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 Practice Problem: 

Enabling the indicator to be ON after a 3 sec delay when switch pressed and OFF immediately by the switch .


 Topics Covered in this example is PLC Timer (ON Delay).



Number of PLC Inputs Required

X1 – Start Switch.

Number of PLC Outputs Required

Y1 – Output Indicator

Number of PLC Timer Required

T0 – 3 second Timer, 100 ms Time Base. (See K30 Preset Value for Timer)

PLC Ladder Programming:




PLC Ladder Program Description:

·        When X1 = ON, TMR instruction will be executed. Timer T1 will be ON and start counting for 3 sec. When T1 reaches its set value, the NO (Normally Open) contact T1 will be activated and indicator YI will be ON. 

·        When X1 = OFF, TMR instruction will not be executed. Timer T1 will be OFF and so will NO contact T1. Therefore, the indicator Y1 will be OFF. 


 

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