Siemens SIMATIC PCS 7 CPU 410-5H System Manual page 147

6. Repeat steps 1 to 4 for the other CPU.
7. Restart the CPU. The fault-tolerant system will return to redundant operating state.
Both CPUs have updated firmware (operating system) and are in redundant operating state.
Note
Only the third number of the firmware versions of the master and standby CPU may differ by
1. You can only update to the newer version.
The constraints described in Chapter Operator controls and operating modes of the CPU
410-5H (Page 99) also apply to a firmware update in RUN.
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.
CPU 410-5H Process Automation
System Manual, 09/2014, A5E31622160-AB
Special functions of the CPU 410-5H
9.6 Firmware update in RUN mode
147