Performance data / operation
5.3 S7 communication characteristics
CP 343-1 ERPC
30 Manual, 03/2010, C79000-G8976-C239-02
5.3 S7 communication characteristics
Number of connections
Characteristic Explanation / values
Number of connections for S7 communication on
Industrial Ethernet
8 S7 connections configured at one or both ends
Also:
2 PG/OP connections
1 diagnostics connection
The number depends on the CPU type being used. Please refer to
/10/ for the values for your CPU.
LAN interface - data field length generated by CP
per protocol data unit
sending
receiving
240 bytes / PDU
240 bytes / PDU
Execution times of the FBs for S7 connections
To calculate the CPU cycle times (OB1) with S7 connections, the execution time for the
function blocks (FBs PUT, GET, USEND, URCV, BSEND, BRCV) required for processing on
the S7-300 / C7-300 CPU is the decisive factor.
Execution time on the CPU per block call
Block type PUT GET USEND URCV BSEND BRCV
Data length <=160 bytes <=16 KB
CPU 314C-2 DP
(6ES7 314-6CF00-0AB0)
<4.9 ms <4.6 ms <4.4 ms <4.8 ms <4.7 ms <4.9 ms
CPU 317-2 PN/DP
(6ES7 317-2EJ10-0AB0)
<1.1 ms <1.4 ms <1.3 ms <1.5 ms <1.4 ms <1.9 ms
5.4 Characteristics of the SEND/RECEIVE interface
Number of connections
The SEND/RECEIVE interface provides access for communication over TCP and UDP
connections.
The following characteristics are important:
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