Description
One connection resource is required in the S7-400 CPU for each of the following communication connections of the Industrial Ethernet CP:
 

Communication connection	Service	TSAP
PG communication via S7 server	Web diagnostics, e.g. for displaying the diagnostics buffer of the CPU Set time in CPU 318 Applets, e.g. to read MLFB or status of the CPU	0x01
System connection via S7 server	FTP server (read and write access to file DBs) FTP client (read and write access to file DBs) Applets (read and write access to CPU data)	0x03
System connection	SEND and RECEIVE	0x0F

If the SEND / RECEIVE, FTP and Web diagnostics services are used simultaneously in the Industrial Ethernet, 3 connection resources of the S7-400 CPU are occupied.

An Industrial Ethernet CP occupies a maximum of 3 connection resources in the S7-400 CPU, i.e. maximum one connection resource for:

• PG communication via S7 server (TSAP=0x01)
• System connection via S7 server (TSAP=0x03)
• System connection SEND/RECEIVE (TSAP=0x0F)