Siemens S7-300 appendix S7 connections, 1 S7 connection as communication path

Communication

3.3 S7 connections

3.2.10.5SNMP communication service

Availability

The SNMP communication service is available for CPUs with integrated PROFINET interface and Firmware 2.3.0 or higher.

Properties

SNMP (Simple Network Management Protocol) is a standard protocol for TCP/IP networks.

Reference

For further information on the SNMP communication service and diagnostics with SNMP, refer to the PROFINET System Description.

3.3S7 connections

3.3.1S7 connection as communication path

An S7 connection is established when S7 modules communicate with one another. This S7 connection is the communication path.

Note

Global data communication, PtP communication, communication with TCP/IP and SNMP do not require S7 connections.

Every communication link requires S7 connection resources on the CPU for the entire duration of this connection.

Thus, every S7 CPU provides a specific number of S7 connection resources. These are used by various communication services (PG/OP communication, S7 communication or S7 basic communication).

3-26	CPU 31xC and CPU 31x, Technical data
	Manual, Edition 08/2004, A5E00105475-05