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
