Siemens Simatic S7-1500R System Manual page 277

Maintenance
11.4 Firmware update
Installation of the firmware update of R/H-CPUs
For a firmware update of the R/H-CPUs, you must switch both R/H-CPUs to the STOP
operating state. A role change between primary and backup CPU can occur during the
process. The following requirement therefore applies: CPU 1 is the primary CPU. CPU 2 is
the backup CPU.
You must proceed in the following order for retentive data to be retained during a firmware
update:
1. Switch CPU 2 to the STOP operating state.
2. Run the update for CPU 2.
Please note: Ignore any pairing error (incorrect firmware) after CPU 2 startup.
3. Switch CPU 1 to the STOP operating state.
4. Now run the update for CPU 1.
5. Switch CPU 1 to the RUN operating state.
6. Switch CPU 2 to the RUN operating state.
Risk of impermissible system states
The installation of the firmware update switches the CPUs to the STOP operating state and
therefore the redundant system to the STOP system state. STOP can impact the operation
of an online process or a machine.
Unexpected operation of a process or a machine can lead to fatal or severe injuries and/or
to material damage.
Ensure before installing the firmware update that the CPU is not controlling any active
process.
Installation of the firmware update for R/H-CPU displays
Firmware updates for the R/H-CPU displays should be run in the RUN-Solo system state. A
role change between primary and backup CPU can occur during the process. The following
requirement therefore applies: CPU 1 is the primary CPU. CPU 2 is the backup CPU.
Follow the sequence below:
1. Switch CPU 2 to the STOP operating state.
2. Run the update for the CPU 2 display.
3. Switch CPU 2 to the RUN operating state. Wait until the R/H system switches to the
RUN-Redundant system state.
4. Switch CPU 1 to the STOP operating state.
5. Run the update for the CPU 1 display.
6. Switch CPU 1 to the RUN operating state. Wait until the R/H system switches to the
RUN-Redundant system state.
276
WARNING
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA