Application and functions
1.4 Performance data
CP 443-5 Extended
Equipment Manual, 01/2023, C79000-G8976-C162-10
19
Diagnostics requests
As a DP master (class 1), the CP 4435 supports diagnostics requests of a DP master (class 2).
Default value for the startup parameter "Monitor
ing time for transfer of parameters to
In the following situations, it is necessary to increase the default value for the startup
parameter "Monitoring time for transfer of parameters to modules" in the Properties dialog 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.
CiR functionality
The configuration limits shown in the above table "General characteristic data of DP mode"
also apply to the entire DP master system if there is a configured DP slave expansion (CiR
functionality).
If you specify the properties of a CiR object in the DP master system of the CP 4435 Extended
in STEP 7, these values are included in checks performed by STEP 7.
The configurable properties relate to:
• The number of DP slaves and modules you can insert in a DP slave
• The number of input and output bytes that can still be configured in RUN.
See also manual /5/ (Page 50).
1.4.3 Characteristic data of open communications services (SEND/RECEIVE
interface) over FDL connections
General characteristic data
The characteristic data is important when operating FDL connections (specified, free layer 2
(SDA and SDN), broadcast, multicast):
Table 1- 5 General characteristic data of open communications services
Total number of FDL connections that can be
32 max.
Size of the transferable data area on FDL
connections.
1-240 bytes max. per specified FDL connection (for sending and receiving)
Free Layer 2, broadcast and multicast:
Up to 236 bytes of user data can be transferred per job. The job header
occupies an additional 4 bytes.
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