Characteristics Of S7 Communication - Siemens CP 343-1 Manual

Performance data

2.3 Characteristics of S7 communication

Also:
● Further TCP connections for Web diagnostics
● PROFINET IO
– As PROFINET IO device:
– As shared device:
– As PROFINET IO controller:
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
•
18
1 PROFINET connection to a PROFINET IO controller
or
2 PROFINET connections to 2 PROFINET IO controllers
or
Max. 32 PROFINET connections to PROFINET IO devices
Explanation / values
in each case, up to
•
•
•
The number depends on the CPU type being used; the valid values
can be found in /1/ (Page 71).
You should still keep to the maximum number of Ethernet connec-
tions specified in the section Number of possible Ethernet/PROFINET
connections (Page 17).
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.
•
•
16 operator control and monitoring functions (HMI)
16 S7 connections configured at one end
16 S7 connections configured at both ends
240 bytes / PDU
240 bytes / PDU
Manual, 12/2018, C79000−G8976−C201-08
CP 343-1