ADD

Overview

IEC operator for the addition of variables

Allowed types

oBYTE

oWORD

oDWORD

oLWORD

oSINT

oUSINT

oINT

oUINT

oDINT

oUDINT

oLINT

oULINT

oREAL

oLREAL

oTIME

oTIME_OF_DAY(TOD)

oDATE

oDATE_AND_TIME(DT)

For time data types, the following combinations are possible:

oTIME+TIME=TIME

oTOD+TIME=TOD

oDT+TIME=DT

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

 

1.   series of ADD boxes

2.   extended ADD box

3.   ADD box with EN/ENO parameters