How do we decide in programming a PLC that we use comparator, timer, registers etc

[phatcreators]

How do we decide in programming a PLC that we use comparator, timer, registers, flags, function blocks etc for any task or for any network ?

thanks in advance

 

[taroot]

It depends on application type. For example you want to do load management for high power devices. you need timer, function blocks or may be comparators. What kinds of logic you implement, decide the use of comparator, timer, registers, flags, and function blocks.