Performance data and behavior in operation
5.5 Characteristics of S7 communication
CP 342-5 / CP 342-5 FO
28 Manual, 10/2011, C79000-G8976-C146-09
Time response on FDL connections
Refer to the following table for transmission rates with FDL connections dependent on the
following parameters:
● Frame length (number of bytes)
● CPU type
The values were measured while sending or receiving successively (at a transmission rate of
1.5 Mbps; bus profile standard; 9 nodes).
Table 5- 1 Number of FDL frames per second for CPU 317
Frame length Number of FDL frames per second
8 bytes 140 / s
128 bytes 138 / s
240 bytes 135 / s
5.5 Characteristics of S7 communication
General characteristic data
The following information is important when operating S7 connections:
Characteristic Explanation / values
Number of operable S7 connections 16 maximum
S7 connections configured at one end / both
ends; including PG and TD/OP connections
Dependencies and restrictions relating to the number of S7 connections
Depending on the configuration and modes, remember the following:
● The actual possible number of S7 connections that can be operated depends on the type
of CPU being used. Further restrictions result from multiprotocol mode; note the
information in the section Parallel use of communications servi
ces (multiprotocol mode)
(Page 30).
● If the CP is
configured as a DP slave, the following restrictions apply:
– S7 connections cannot be operated;
– OP multiplex mode is not possible.
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