LT

Less than

A Boolean operator that returns the value TRUE when the value of the first operand is less than that of the second. The operands can be BOOL, BYTE, WORD, DWORD, SINT, USINT, INT, UINT, DINT, UDINT, REAL, LREAL, TIME, DATE, TIME_OF_DAY, DATE_AND_TIME and STRING.

Example in IL:

LD 20

LT 30

ST Var1 (* Result is TRUE *)

Example in ST:

VAR1 := 20 < 30;

Example in FBD: