Operator: ADD
The IEC operator adds variables.
Permitted data types: __UXINT | __XINT | __XWORD | BYTE | DATE | DATE_AND_TIME | DINT | DT | DWORD | INT | LDATE | LDATE_AND_TIME | LDT | LINT | LREAL | LTIME | LTOD | LWORD | REAL | SINT | TIME | TIME_OF_DAY | TOD | UDINT | UINT | ULINT | USINT | WORD
Possible combinations for time data types
TIME + TIME = TIMETIME + LTIME = LTIMELTIME + LTIME = LTIME
Possible combinations for date and time data types
TOD + TIME=TODDT + TIME=DTTOD + LTIME=LTODDT + LTIME=LDTLTOD + TIME=LTODLDT + LTIME=LDTLTOD +LTIME=LTODLDT + LTIME=LDT
Feature in the FBD/LD editor: You can extend the ADD operator with function block inputs. The number of additional function block inputs is limited.
Example 106. Examples
ST
var1 := 7+2+4+7;
FBD
