Property is indexed. Possible indexes are from 1 to 50.

PLC inputs and outputs that are required for controlling can be defined at a planning object. Enter here the processor to which the PLC connection point is assigned. A CPU is uniquely identified by specification of the CPU name in the form [Configuration project].[Station ID].[CPU identifier]. The individual PLC inputs and outputs are differentiated via the index, with a maximum of 50.

Reference

PlanningSegmentPropertyList Class
PlanningSegmentPropertyList Members