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Supplementary information
16.4 Configuring with STEP 7
The special case of CPUs
You can only set the CPU0 parameters (CPU on rack 0). Any values that you specify are
automatically allocated to CPU1 (CPU on rack 1). You can set the following values for
CPU1:
● Parameters of the DP interface (X1)
● Addresses of sync modules
● Parameters of the PROFINET IO interface
16.4.4
Recommendations for setting CPU parameters, fixed settings
Monitoring time for transferring parameters to modules
You specify this monitoring time on the "Startup" tab. It depends on the configuration of the
fault-tolerant station. If the monitoring time is too short, the CPU enters the W#16#6547
event in the diagnostics buffer.
For some slaves (e.g., IM 153-2) these parameters are packed in system data blocks. The
transmission time of the parameters depends on the following factors:
● Baud rate of the bus system (high baud rate => short transmission time)
● Size of the parameters and the system data blocks (long parameter => long transmission
time)
● Load on the bus system (many slaves => slow transmission rate);
Note: The bus load is at its peak during restart of the DP master, for example, following
Power OFF/ON
Recommended setting (default setting of the CPU 410): 600 corresponds to 60 s.
Note
The fault-tolerant-specific CPU parameters, and thus also the monitoring times, are
calculated automatically. The work memory allocation of all data blocks is based on a CPU-
specific default value. If your fault-tolerant system does not link up, check the data memory
allocation (HW Config > CPU Properties > H Parameters > Work memory used for all data
blocks).
See also
Service & Support (http://www.siemens.com/automation/service&support)
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CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
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