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5 Performance Data
5.1
Supported Transmission Rates
The transmission rate is set with the SIMATIC STEP 7 configuration software. For
the permitted rates, refer to Table 7-1 in Section 7
5.2
Characteristics of the DP Interface
No special FBs or FCs are necessary for the DP mode. The interfacing to the
distributed peripheral I/O is by direct I/O access or using SFCs/SFBs of the CPU
(see /11/).
Table 5-1
Characteristic
Number of DP slaves that can be operated
Max. size of the input area of all DP slaves
Max. size of the output area of all DP slaves
Maximum number of inputs per DP slave
Maximum number of outputs per DP slave
Max. size of the consistent area for a module
Diagnostic Requests
As a DP master class 1, the CP 443-5 supports diagnostic requests of a DP
master class 2.
Note
In some 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:
S
When there is a large number of modules (DP slaves) configured that can be
assigned parameters;
S
When a high value is configured for the constant bus cycle time in the network
properties of the PROFIBUS DP chain.
CP 443-5 Extended for PROFIBUS / Manual Part B4
Release 6/2005
C79000-G8976-C162-06
5 Performance Data
Explanation / Values
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B4-17
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