Basic PLC Ladder Programming Examples 8

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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