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Application and functions
1.3 Configuration limits and performance data
1.3.2
Transmission speeds supported
The transmission speed is set in STEP 7.
Note
Remember the cable length
For the selected transmission speed, the permitted cable length must be kept to.
For this refer to the information in the PROFIBUS function manual:
Link: (https://support.industry.siemens.com/cs/ww/en/view/59193579)
1.3.3
Characteristic data of the DP interface
Characteristic data of DP mode
No special program blocks are required for DP mode. The interfacing to the distributed I/O is
by direct I/O access or using program blocks (SFCs/SFBs) of the CPU.
Table 1- 1
Characteristic
Max. number of operable DP slaves
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
* When using DP slaves with extensive configuration data e.g. SINAMICS devices, the number of DP
Diagnostics requests
As a DP master (class 1), the CM 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:
• A large number of modules (DP slaves) is configured.
• When a high value is configured for the constant bus cycle time in the network properties
of the PROFIBUS DP line.
14
Characteristic data of DP mode
slaves that can be operated on the CM sinks.
Explanation / values
125 *
8 KByte
8 KByte
244 Byte
244 Byte
128 Byte
Operating Instructions, 01/2023, C79000-G8976-C290-07
SIMATIC CM 1542-5
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