Siemens CPU 410-5H Process Automation - Page 165

System modifications during redundant operation
10.6 Re-parameterization of a module
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
165
Result
The reserve CPU links up and is updated. The fault-tolerant system is operating in redundant
system mode.
Note
Any set up access right is not canceled until you stop the SIMATIC Manager. You should
reset the access right once again to prevent unauthorized access. You reset the access right
in the
SIMATIC Manager with the menu command PLC > Access Rights > Cancel.
Reaction of the I/O
Type of I/O
One-sided I/O of the standby
CPU
One-sided I/O of the master
CPU
Switched I/O
I/O modules are given new parameter
settings
1)
and updated by the
CPU.
continue operation without interruption.
1) Central modules are also reset first. Output modules briefly output 0 during this time (instead of the configured substitute
or hold values).
Reaction to monitoring timeout
If one of the monitored times exceeds the configured maximum, the update is canceled. The
fault-tolerant system remains in single mode with the previous master CPU and, assuming
certain conditions are met, attempts the link-up and update later. For additional information,
refer to section Time monitoring (Page 110).
Where the values for the monitoring times in the CPUs differ, the higher values always apply.