Rockwell-automation GMLC Reference Manual Manual de usuario descargar pdf (Pagina 508)

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101

Publication GMLC-5.2 - November 1999

Expression Operators 471

The first expression evaluates to 1 (true) if the sum of the cut length

variable and 10 equals the actual position of Axis 0. Otherwise it is 0

(false). However, the second expression evaluates to 11, if the actual

position of Axis 0 equals the cut length (Actual Position of Axis 0 = Cut

Length is true (1); then 1 + 10 = 11) and 10 if not (Actual Position of Axis

0 = Cut Length is false (0); then 0 + 10 = 10).

You can use parentheses to change the default left-to-right precedence of

operations, as explained earlier in this section. Continuing the example

above, the following two expressions do produce the same result—the

parentheses force the addition to be performed before the comparison.

Cut_Length + 10 = Actual_Position_AXIS0

Actual_Position_AXIS0 = (Cut_Length + 10)

Both expressions evaluate as 1 (true) if the sum of the cut length variable

and 10 is equal to the actual position of Axis 0 and 0 (false) otherwise.

Equal to =

Use the equal sign to determine if an element or expression is equal to

another element or expression. If the two are equal (have the same value),

the comparison is true (1), and if not it is false (0). For example, the

following expression has a value of 1 (true) if the current value of the

input group Input_Group is 13 and 0 (false) otherwise.

Input_Group = 13

Not Equal to !

Use an exclamation point in front of an equal sign to determine if an

element or expression is not equal to another element or expression. If the

two are not equal (do not have the same value), the comparison is true (1).

If they are equal, it is false (0). For example, the following expression has

a value of 0 (false) if the current value of the input group Input_Group is

13 and 1 (true) otherwise.

Input_Group != 13

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