Siemens SIMATIC S7-1500 System Manual page 466
Redundant system
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Also See for SIMATIC S7-1500:
- Function manual (402 pages) ,
- System manual (393 pages) ,
- Manual (188 pages)
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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 firmware update.
The initial situation is assumed in the following: 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 (not with R-CPUs as of FW version V3.0)
Firmware updates for the R/H-CPU displays are run in the RUN-Solo/STOP system state. A role
change between primary and backup CPU can occur during the firmware update. The initial
situation is assumed in the following: 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.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
WARNING
Maintenance
14.4 Firmware update
465
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