ADD

Overview

IEC operator for the addition of variables

Allowed 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

For time data types, the following combinations are possible:

• TIME+TIME=TIME

• TIME+LTIME=LTIME

• LTIME+LTIME=LTIME

For date and time data types, the following combinations are possible:

• TOD+TIME=TOD

• DT+TIME=DT

• TOD+LTIME=LTOD

• DT+LTIME=LDT

• LTOD+TIME=LTOD

• LDT+LTIME=LDT

• LTOD+LTIME=LTOD

• LDT+LTIME=LDT

In the FBD/LD editor, the ADD operator is an extensible box. This means, instead of a series of concatenated ADD boxes, you can use 1 box with multiple inputs. Use the command Insert Input for adding further inputs. The number is unlimited.

Example in IL

LD     7
ADD    2
ADD    4
ADD    7
ST     iVar

Example in ST

var1 := 7+2+4+7;

Examples in FBD