Compare; Compare Number Values - Siemens SIMATIC S7 System Manual

Program instructions

7.4 Compare

7.4 Compare
7.4.1

Compare number values

The compare instructions can compare two number values with the same data type. You can
compare bytes, integers, double integers, and real numbers.
For LAD and FBD: When the comparison is TRUE, the compare instruction sets ON a
contact (LAD network power flow), or output (FBD logic flow).
For STL: When the comparison is TRUE, the compare instructions can load, AND, or OR a 1
with the value on the top of the logic stack.
Types of comparison
Six comparison types are available:
Comparison type
== (LAD/FBD)
= (STL)
<>
>=
<=
>
<
230
The output is TRUE only if
IN1 is equal to IN2
IN1 is not equal to IN2
IN1 is greater than or equal to IN2
IN1 is less than or equal to IN2
IN1 is greater than IN2
IN1 is less than IN2
System Manual, V2.3, 07/2017, A5E03822230-AF
S7-200 SMART