Relay ladder logic is used in a PC because:
A
it is impossible to write a control program for a machine in any other logic
B
it is the best industrial control language ever developed.
C
most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
D
All of the above
E
None of the above
Correct Answer: most industrial control personnel are familiar with relay ladder logic diagrams and this is the easiest for them to use
