Assigning Parameters To Modules In A Fault-Tolerant Station; Recommendations For Setting Cpu Parameters, Fixed Settings - Siemens SIMATIC PCS 7 System Manual

Supplementary information
16.4 Configuring with STEP 7
Special features in presenting the hardware configuration
In order to enable quick recognition of a redundant DP master system or PN/IO system,
each of them is represented by two parallel cables.
16.4.3

Assigning parameters to modules in a fault-tolerant station

Procedure
Assign all parameters of the redundant components identically, with the exception of
communication addresses.
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 interfaces
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
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CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB