SUB (subtract)

The SUB instruction subtracts one Integer, Real, or Time value from another Integer, Real, or Time value.
Languages supported: Function block diagram, ladder diagram, structured text.
This instruction applies to the Micro810, L20E, L50E, and L70E controllers.
SUB
SUB
SUB parameters
Parameter
Parameter Type
Data Type
Description
EN
Input
BOOL
When set to true, the instruction is enabled.
  • TRUE: Execute the current computation.
  • FALSE: There is no computation.
Applies to ladder diagram programs.
i1
Input
SINT
USINT
BYTE
INT
UINT
WORD
DINT
UDINT
DWORD
LINT
ULINT
LWORD
REAL
LREAL
TIME
Minuend in any Integer, Real, or Time data type.
All inputs must be of the same data type.
i2
Input
SINT
USINT
BYTE
INT
UINT
WORD
DINT
UDINT
DWORD
LINT
ULINT
LWORD
REAL
LREAL
TIME
Subtrahend in any Integer, Real, or Time data type.
All inputs must be of the same data type.
o1
Output
SINT
USINT
BYTE
INT
UINT
WORD
DINT
UDINT
DWORD
LINT
ULINT
LWORD
REAL
LREAL
TIME
Difference of the minuend and the subtrahend in any Integer, Real, or Time data type.
Output must be the same data type as inputs.
ENO
Output
BOOL
Enables output. Applies to ladder diagram programs.

SUB examples

SUB function block diagram example
SUB function block diagram example
SUB ladder diagram program example
SUB ladder diagram program example
(* ST equivalence: *)
ao10 := ai101 - ai102;
ao5 := (ai51 - 1) - ai53;
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