Recommendations For Setting Cpu Parameters, Fixed Settings - Siemens SIMATIC PCS 7 CPU 410-5H System Manual

15.4.4

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)
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
Supplementary information
15.4 Configuring with STEP 7
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