PLC programming

For which sort pop, push instr. r used?. Is it representable?. If so, n' what way?

Stacking it high

Sounds like you're refering to stack instructions. Every PLC handles this differently. Even families of PLC handle it differently from model to model. In A-B, the SLC 500 has no real stack commands, but later generations (503 and 504, and Micros) do.

So yes, they exist. Your teacher has not sent you on a wild goose chase. I suggest going to the AB website and downloading the MicroLogix Instruction Reference manual, it has everything you need to complete your assignment

TM

What ex. ques. u as?

Boy, is this question taking me back! I haven't had to play directly with the stack in years!

The stack referred to above is simply the stack of numbers that various mathematical functions are working with. Think of the values in the stack like the stacks of clean plates at the beginning of a cafeteria line. Only the top number is accessible. Push shoves a new number onto the stack, and pop takes one off.

By the way, you will get better quality answers if you write better quality questions. Grammar, syntax, and spelling count!