Siemens S7-300 Connection resources for routing, Number of connection resources for routing

Communication

3.3 S7 connections

3.3.4Connection 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

Example of a CPU 314C-2 DP

The CPU 314C-2 DP provides 12 connection resources:

•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.

Example for a CPU 317-2 PN/DP

The CPU 317-2 PN/DP provides 32 connection resources:

•Reserve four connection resources for PG communication.

•Reserve six connection resources for OP communication.

•Reserve two connection resources for S7-based communication.

•In NetPro you configure eight S7 connection resources for S7 communication via the integrated PROFINET interface

This leaves 12 S7 connections available for any communication service, e.g.

S7 communication, OP communication, etc. However, only a maximum of 16 connection resources can be configured for S7 communication at the integrated PN interface in NetPro. In addition, 24 routing connections are available that do not affect the S7 connection resources mentioned above.

CPU 31xC and CPU 31x, Technical data	3-31
Manual, Edition 08/2004, A5E00105475-05