Step 6: Transition To Redundant System State - Siemens SIMATIC PCS 7 System Manual

System modifications during redundant operation
10.3 Adding components
Reaction to monitoring timeout
The update is canceled and no change of master takes place if one of the monitored times
exceeds the configured maximum. The fault-tolerant system remains in single mode with the
previous master CPU and, assuming certain conditions are met, attempts the master
changeover later. For additional information, refer to the section Time monitoring (Page 117).
10.3.6

Step 6: Transition to redundant system state

Starting situation
The fault-tolerant system is operating with the new hardware configuration in single mode.
Procedure
1. In SIMATIC Manager, select a CPU of the fault-tolerant system, then select "PLC >
Operating Mode" from the menu.
2. From the "Operating Mode" dialog box, select the reserve CPU, then click "Warm
Restart".
Result
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.
Reaction of the I/O
Type of I/O
Added I/O mod-
ules
I/O modules still
present
150
One-sided I/O of the
standby CPU
are given new parameter
settings and updated by
the CPU.
Driver blocks are not yet
present. Any interrupts
occurring are not report-
ed.
are given new parameter
settings and updated by
1)
the CPU.
One-sided I/O of the
master CPU
are updated by the CPU.
Driver blocks are not yet present. Process or diag-
nostic interrupts are detected, but are not reported.
continue operation without interruption.
CPU 410-5H Process Automation/CPU 410 SMART
System Manual, 09/2014, A5E32631667-AB
Switched I/O