IEC operator⮫ “Overview”: Addition of variables of the types: BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT, REAL and LREAL.
Two TIME variables can also be added together resulting in another time (e.g., t#45s + t#50s = t#1m35s)
Example in ST:
var1 := 7+2+4+7;
Example in FBD:
