PLC Programming Comparison Instructions – LIM | Limit Test

The LIM, also known as the Limit Test, is an instruction which will compare the specified operand to two limits: lower limit and high limit. Should the value be greater than the lower limit and less than the higher limit, the instruction will set the output to TRUE. However, if the opposite is the case, the instruction will evaluate to FALSE. Furthermore, the reversal of the two limits will have the opposite logic effect on the instruction effectively resulting in a NOT of the original instruction.

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