System modifications during redundant operation
10.4 Removal of components
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 10/2013, A5E32631667-AA
153
The reserve CPU links up and is updated. The fault-tolerant system is operating with the new
hardware configuration 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.
One-sided I/O of the
standby CPU
One-sided I/O of the
master CPU
I/O modules to be
removed
1)
are no longer addressed by the CPU.
Driver blocks are no longer present.
I/O modules still
present
are given new parameter
settings
2)
and updated by
continue operation without interruption.
DP stations to be
as for I/O modules to be removed (see above)
1) No longer included in the hardware configuration, but still plugged in
2) Central modules are first reset. 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).
Step 7: Modify hardware
Starting situation
The fault-tolerant system is operating with the new hardware configuration in redundant
system mode.
1. Disconnect all the sensors and actuators from the components you want to remove.
2. Unplug modules of the one-sided I/Os that are no longer required from the racks.
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