Rockwell Automation AutoMax Enhanced Ladder Language Reference Manual - Manual (Page 122)

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5.8.3 Example of the Square Root Instruction
When switch1 is true, the instruction calculates
the square root of 4 and stores a value of 2 in
the variable result.
Had In contained a value of 8, the result of the
square root calculation still would have been 2,
because the result is truncated to a whole
number.
5.9 Subtract (SUB)
Use this instruction to subtract two variables or constants. While EN is true, the
instruction subtracts In2 from In1. The result is stored in Out.