Siemens Simatic S7-300 CPU 31xC and CPU 31x S7-300 - Manual (Page 58)

Communication
3.3 S7 connections
CPU 31xC and CPU 31x, Technical data
3-30
Manual, Edition 08/2004, A5E00105475-05
Availability of connection resources
Table 3-11 Availability of connection resources
Reserved for CPU Total number
connection
resources
PG
communication
OP communication S7 basic
communication
Free
S7 connections
312C 6 1 to 5, default 1 1 to 5, default 1 0 to 2, default 2
313C
313C-2 PtP
313C-2 DP
8 1 to 7, default 1 1 to 7, default 1 0 to 4, default 4
314C-2 PtP
314C-2 DP
12 1 to 11, default
1
1 to 11, default 1 0 to 8, default 8
312 6 1 to 5, default 1 1 to 5, default 1 0 to 2, default 2
314 12 1 to 11, default
1
1 to 11, default 1 0 to 8, default 8
315-2 DP
315-2 PN/DP
16 1 to 15, default
1
1 to 15, default 1 0 to 12, default 12
317-2 DP
317-2 PN/DP
32 1 to 31, default
1
1 to 31, default 1 0 to 30, default 0
Displays all non-
reserved S7
connection resources
as free connection
resources.
Note
When using a CPU 315-2 PN/DP, you can configure up to 14 connection resources for
S7 communication in NetPro: These connections are then reserved. When using a
CPU 317-2 PN/DP, you can configure up to 16 connection resources for S7 communication
in NetPro.