Siemens CP 343-1 - S7 Communication Characteristics

Performance data
2.3 Characteristics of S7 communication
CP 343-1
18 Manual, 12/2018, C79000−G8976−C201-08
Also:
● Further TCP connections for Web diagnostics
● PROFINET IO
– 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
2.3
Characteristics of S7 communication
Number of connections
Table 2- 2 Number of connections for S7 communication
Characteristic
Explanation / values
Number of connections for S7 communication via
Industrial Ethernet.
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 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.
LAN interface - data field length generated by CP
per protocol data unit
• sending
• receiving
• 240 bytes / PDU
• 240 bytes / PDU