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Performance data
2.3 Characteristics of S7 communication
● Further TCP connections for Web diagnostics
● PROFINET IO
2.3
Characteristics of S7 communication
Number of connections
Table 2- 2
Number of connections for S7 communication
Characteristic
Number of connections for S7 communication via
Industrial Ethernet.
LAN interface - data field length generated by CP
per protocol data unit
sending
receiving
16
– As PROFINET IO device:
1 PROFINET connection to a PROFINET IO controller
or
– As shared device:
2 PROFINET connections to 2 PROFINET IO controllers
or
– As PROFINET IO controller:
Max. 32 PROFINET connections to PROFINET IO devices
Explanation / values
in each case, up to
16 operator control and monitoring functions (HMI)
16 S7 connections configured at one end
16 S7 connections configured at both ends
The number depends on the CPU type being used; the valid values
can be found in /1/ (Page 68).
You should still keep to the maximum number of Ethernet
connections specified in the section Number of possible
Ethernet/PROFINET connections (Page 15).
maximum 16 resources
For each executed S7 communications function, a job resource is
required. If the CP has 16 job resources, then only 1 PUT or GET job
can be executed at one time on each of the 16 S7 connections. The
same applies to BSEND/BRECV and USEND/URECV jobs.
240 bytes / PDU
240 bytes / PDU
Manual, 10/2012, C79000−G8976−C201-07
CP 343-1
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