Table of Contents
Advertisement
Performance data and behavior in operation
5.5 Characteristics of S7 communication
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
Frame length
8 bytes
128 bytes
240 bytes
5.5
Characteristics of S7 communication
General characteristic data
The following information is important when operating S7 connections:
Characteristic
Number of operable S7 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
● If the CP is configured as a DP slave, the following restrictions apply:
28
Number of FDL frames per second for CPU 317
of CPU being used. Further restrictions result from multiprotocol mode; note the
information in the section Parallel use of communications services (multiprotocol mode)
(Page 30).
– S7 connections cannot be operated;
– OP multiplex mode is not possible.
Number of FDL frames per second
140 / s
138 / s
135 / s
Explanation / values
16 maximum
S7 connections configured at one end / both
ends; including PG and TD/OP connections
Manual, 10/2011, C79000-G8976-C146-09
CP 342-5 / CP 342-5 FO
Advertisement
Table of Contents
