=
Operator - Test if first input is equal to second input.
Inputs
|
Input |
Data type |
Description |
|
IN1 |
ANY |
First input. |
|
IN2 |
ANY |
Second input. |
Outputs
|
Output |
Data type |
Description |
|
Q |
BOOL |
TRUE if IN1 = IN2. |
Remarks
Both inputs must have the same type. In LD language, the input rung (EN) enables the operation, and the output rung is the result of the comparison.
Comparisons can be used with strings. In that case, the lexical order is used for comparing the input strings. For instance, "ABC" is less than "ZX" ; "ABCD" is greater than "ABC".
Equality comparisons cannot be used with TIME variables. The reason why is that the timer actually has the resolution of the target cycle and test may be unsafe as some values may never be reached.
ST Language
Q := IN1 = IN2;
FBD Language
LD Language
The comparison is executed only if EN is TRUE:
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