Rockwell Automation GMLC Reference Manual - Manual (Page 501)

Publication GMLC-5.2 - November 1999
464 The Expression Builder
Subtraction
-
Use the minus sign (or dash) to subtract two elements. For example, the
following expression evaluates as 7.5 if the most recent registration
position of Axis 0 is 2.5 position units.
Registration_Position_AXIS0 - 10
The minus sign may also be used as a unary minus to negate the value of
an element or expression. When used as a unary minus, the minus sign
and the element or expression must be enclosed in parentheses. For
example, the following expression negates the actual position of Axis 0,
resulting in a value of -55.1 if the current actual position of Axis 0 is 55.1
position units.
(-Actual_Position_AXIS0)
Multiplication
*
Use the asterisk to multiply two elements together. For example, the
following expression evaluates as 3.4 if the current position error of Axis
0 is 6.8 position units.
Position_Error_AXIS0 * 0.5
Division
/
Use the slash to divide two elements. For example, the following
expression evaluates as 1.66666666666667. Note that the operation
performed by the slash is floating point division and the result is accurate
to 15 significant digits.
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