Ladder Logic Limit Test Instruction

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LIM - Limit Test

Test whether one value is within the limit range of two other values

Example

Let go back to our HPU system. When the temperature of the oil is >= 50 degree and <=125 degree then we are in operating mode. That means we have the permission to run the HPU System.

Ladder Logic Solution

  • Temperature element I:3.0
  • HPU No permission B3:0/0

We test our temperature the both limits. The low limit is 50 degree and High limit is 125. If the temperature is outside this range then we don't have the permission to run.

LIM 1 SLC 500 Beginners Training Guide

Note

  • Temperature is an analog value.

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