DEC

 Function - Decrease a numerical variable.

Inputs

Input	Data Type	Range	Unit	Default	Description
IN	ANY				Numerical variable (increased after call). See FFLD Data In / Data Out for more information.

Outputs

Output	Data Type	Range	Unit	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, a variable is decreased by 1.0.
• For time values, a variable is decreased by 1ms.
• The IN input must be directly connected to a variable.
  • It cannot be a constant or complex expression.

FBD Language Example

FFLD Language Example

IL Language Example

Not available.

ST Language Example

• This function is particularly designed for the ST Language.
  • It allows simplified writing.
  • Assigning the result of the function is not mandatory.

IN := 2;
Q := DEC (IN);
(* now: IN = 1 ; Q = 1 *)
DEC (IN); (* simplified call *)