Here I want to show you one example for solving that kind of application with help of easy logical functions

Length or Height Control

• Normal =  2 beams blocked at once
• Short = 1 beam only
• Long = ≥ 3 beams

For reaching definitely results we use 4 beams:

Zone Configuration

we start with Zone Configuration
in our example the 4 zones (Qint) are equal with beam channels:

Logical Configuration

in the next step we start the Logical Configuration, where we must take care of all kind of possible conditions when the objects are passing the 4 beams.
To make it more clear I have put the truth table aside.

Logic 2 = Short

• Logic 1 = sensor 1, 3, 4  detect no object
• Logic 2 = object detected at sensor 2 and no other

Logic 5 = normal size

• Logic 3 = sensor 2 & 3  detect object at once
• Logic 4 = sensor 1 & 4 detect no object
• Logic 5 = exclusive detection at sensor 2 & 3

Logic 6 = Long

• Logic 6 = sensor 1 & 2 & 3  detect object at once

Pin Configuration

here we allocate our well done Logic Functions to physical switching outputs

• Q1 = Normal
• Q2 = Short
• Q3 = Long

Process Data Configuration

finally we finish  with the Process Data Configuration.
That step is optional - only if any data interface is used for instance IO-Link or RS485

In that example we select one of the pre-defined formats.
For instance, we can use Byte 4 or Byte 5 for reading our logic result.