(3) LADDER LOGIC | LADDER FREE LEARNING

LADDER LOGIC (BASIC LOGIC)

         LADDER Programming use the normal logic include AND logic,OR logic and NOT logic

Firstly, To coding ladder program you should learn the contact circuit.

AND Logic

Figure (1) :  AND Logic

AND Logic : According figure (1)  was meaning  A  and B  (A=1 and B=1 Output = 1 If A=1 or 0 and B=0 or 1 Output = 0)

OR Logic

Figure (2) : OR Logic

OR Logic :  According figure (2) was meaning  C or D (C=1(0) or D=1(0) Output =1 If C = 0 and D = 0 Output = 0 )

NOT Logic

Figure (3) : NOT Logic

NOT Logic  : ref.Figure (3)  if E=0 Output = 1 (Ex. E=Open will output = Close)

These basic logic for develop program to advance step.

next entry : application of basic logic (advance logic)