You can parametrize any port number in the PartCounter add-on. The advantage of the pre-defined port numbers is that these numbers are explicitly reserved for PartCounter usage in the Control plus system.
If you use any other port number you just have to ensure that this port number is not used by any other TCP/IP device or software.
The IT Security Guideline contains a list of all pre-defined port numbers in the Control plus system: https://www.bosch-connected-industry.com/de/en/downloads/automation/control-plus/documentation.html
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