Characteristics Of S7 Communication - Siemens PROFIBUS CP 1542-5 Manual

Functional characteristics

3.3 Characteristics of S7 communication

Diagnostics requests
As a DP master (class 1), the CP 1542-5 supports diagnostics requests of a DP master
(class 2).
DP startup behavior
Note
Increasing the default value for startup parameters - configuration of the CPU
In some situations, it is necessary to increase the default value for the startup parameter
"Parameter assignment time for the distributed I/O" in the configuration of the CPU:
• When there is a large number of modules (DP slaves) configured that can be assigned
parameters.
• When a high value is configured for the constant bus cycle time in the network properties
of the PROFIBUS DP line.
3.3 Characteristics of S7 communication
General characteristic data
The following information is important when operating S7 connections:
Table 3- 2
Characteristic
Number of S7 connections that can
be operated via PROFIBUS
14
General characteristics of S7 connections
Explanation / values
Operable in total: Max. 16
The value depends on the S71500 CPU being used.
Manual, 11/2014, C79000-G8976-C326-03
CP 1542-5