DEC
Function - Decrease a numerical variable.
Inputs
|
Input |
Data type |
Description |
|
IN |
ANY |
Numerical variable (increased after call). |
Outputs
|
Output |
Data type |
Description |
|
Q |
ANY |
Decreased value. |
Remarks
When the function is called, the variable connected to the IN input is decreased and copied to Q. All data types are supported except BOOL and STRING: for these types, the output is the copy of IN.
For real values, variable is decreased by 1.0. For time values, variable is decreased by 1ms.
The IN input must be directly connected to a variable, and cannot be a constant or complex expression.
This function is particularly designed for ST language. It allows simplified writing as assigning the result of the function is not mandatory.
ST Language
IN := 2;
Q := DEC (IN);
(* now: IN = 1 ; Q = 1 *)
DEC (IN); (* simplified call *)
FBD Language
LD Language
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