Programmable Logic Controllers
Programmable Logic Controllers
5th Edition
ISBN: 9780073373843
Author: Frank D. Petruzella
Publisher: McGraw-Hill Education
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Chapter 7, Problem 11P
Program Plan Intro

Anti-tie down circuit:

The term “anti-tie down circuit” refers to a non-repetitive circuit which enables the circuit to operate for one cycle. The circuit must be activated by pushing both start buttons to operate the cycle each time.

Timer ON Delay (TON):

  • TON refers to an on-delay timer.
  • The on-delay timer is the most commonly used timer.
  • TON counts the time-based intervals as soon as the instruction becomes true.
  • Here, the output changes its state from low to high when the timer provides some time delay (instruction goes from OFF to ON state).

Given:

Assume that the two palm start buttons are named as “SW1” and “SW2”. It is given that both buttons should be pressed at the same time within 0.5 seconds. It is also given that the circuit does not allow operating the press with one button.

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