Operator ‘SUB’

This IEC operator is used for subtracting variables.

Permitted data types: BYTE, WORD, DWORD, LWORD, SINT, USINT, INT, UINT, DINT, UDINT, LINT, ULINT, REAL, LREAL, TIME, TIME_OF_DAY (TOD), DATE, DATE_AND_TIME (DT)

Possible combinations for TIME data types: TIME-TIME = TIME, DATE-DATE = TIME, TOD-TIME = TOD, TOD-TOD = TIME, DT-TIME = DT, DT-DT = TIME

Note

Negative TIME values are undefined.

Examples

ST:

var1 := 7-2;

FBD: