Siemens S7-400 Service Manual Page 37

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Ladder Logic (LAD) for S7-300 and S7-400 Programming
A5E00706949-01
2-1
2 Comparison Instructions
2.1 Overview of Comparison Instructions
Description
IN1 and IN2 are compared according to the type of comparison you choose:
== IN1 is equal to IN2
<> IN1 is not equal to IN2
> IN1 is greater than IN2
< IN1 is less than IN2
>= IN1 is greater than or equal to IN2
<= IN1 is less than or equal to IN2
If the comparison is true, the RLO of the function is "1". It is linked to the RLO of a
rung network by AND if the compare element is used in series, or by OR if the box
is used in parallel.
The following comparison instructions are available:
CMP ? I Compare Integer
CMP ? D Compare Double Integer
CMP ? R Compare Real
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