Beckhoff CX-B930 Series, Manual, Page: 13 / 48

Connection and cabling
CXxxxx-M930/B930 13 Version: 1.1
STP
Shielded twisted pair
Describes a cable with an outer screen, without defining the nature of the screen any more closely.
S/STP
Screened/shielded twisted pair (wires are individually screened)
This identification refers to a cable with a screen for each of the two wires as well as an outer shield.
ITP
Industrial Twisted-Pair
The structure is similar to that of S/STP, but, in contrast to S/STP, it has only one pair of conductors.
3.3 Topology
PROFINET
Fig. 1: Example for a PROFINET topology.