Communication
3.3 S7 connections
CPU 31xC and CPU 31x, Technical Data
3-32 Manual, 01/2006 Edition, A5E00105475-06
3.3.4 Connection resources for routing
Number of connection resources for routing
The CPUs with DP interface provide a different number of connection resources for the
routing function:
Table 3-12 Number of routing connection resources (for DP/PN CPUs)
CPU As of firmware version Number of connections for routing
31xC, CPU 31x 2.0.0 Max. 4
317-2 DP 2.1.0 Max. 8
31x-2 PN/DP 2.2.0 Interface X1 configured as:
• MPI:Max. 10
• DP master: Max. 24
• DP slave (active): Max. 14
Interface X2 configured as:
• PROFINET: Max. 24
319-3 PN/DP 2.4.0 Interface X1 configured as:
• MPI: Max. 10
• DP master: Max. 24
• DP slave (active): Max. 14
Interface X2 configured as:
• DP master: Max. 24
• DP slave (active): Max. 14
Interface X3 configured as:
PROFINET: Max. 48
Example of a CPU 314C-2 DP
The CPU 314C-2 DP provides 12 connection resources (refer to Table 3-11):
• Reserve two connection resources for PG communication.
• Reserve three connection resources for OP communication.
• Reserve one connection resource for S7-based communication.
This leaves six connection resources available for other communication service, e.g. S7
communication, OP communication, etc.
In addition 4 routing connections via the CPU are possible.
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