Compare Instructions
The compare instructions let you compare values by using an expression or a specific compare instruction.
Available Instructions
Ladder Diagram
Function Block Diagram
FBD Block
Structured Text
Not available
If you want to: | Use this instruction: |
|---|---|
compare values based on an expression | CMP |
test whether two values are equal | EQ |
test whether one value is greater than or equal to a second value | GE |
test whether one value is greater than a second value | GT |
test whether the source is infinite | IsINF |
test whether the source is not a number | IsNAN |
test whether one value is less than or equal to a second value | LE |
test whether one value is less than a second value | LT |
test whether one value is between two other values | LIMIT |
pass two values through a mask and test whether they are equal | MEQ |
test whether one value is not equal to a second value | NE |
Compare values of different data types, such as floating point and integer.
The bold data types indicate optimal data types. An instruction executes at its fastest and with it lowest memory requirements if all the parameters of the instruction use the same optimal data type, typically DINT or REAL.
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