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Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 285
Compute/Math Instructions (CPT, ADD, SUB, MUL, DIV, MOD, SQR, SQRT, NEG, ABS) Chapter 6
Example: Calculate the square root of value_1 and place the result in sqr_result.
Relay Ladder
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sqr_result := SQRT(value_1);
Function Block