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Operator: SUB

The IEC operator subtracts variables.

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

Possible combinations for time data types

  • TIME - TIME = TIME

  • LTIME - LTIME = LTIME

Possible combinations for date and time data types

  • DATE - DATE = TIME

  • LDATE - LDATE = LTIME

  • TOD - TIME = TOD

  • LTOD - LTIME = LTOD

  • TOD - TOD = TIME

  • LTOD - LTOD = LTIME

  • DT - TIME = DT

  • LDT - LTIME = LDT

  • DT - DT = TIME

  • LDT - LDT = LTIME

Tip

Negative TIME/LTIME values are undefined.

Example 107. Examples

ST

var1 := 7-2;

FBD

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