Firmware Update - Siemens SIMATIC S7-1500 System Manual

14.4

Firmware update

Introduction
You use firmware files to update the firmware of the CPUs, displays, PS/CPs and the IO
devices (for example due to function extensions). The retentive data is retained after the
firmware has been updated.
Note
CPUs operating in redundant mode
CPUs operating in redundant mode must have the same article number and the same
firmware version.
For the replacement of components, the two CPUs operating in redundant mode must have
the same firmware version. Downgrades are therefore possible as well as updates.
Note
CPU downgrades and upgrades
You cannot upgrade a standard CPU or F-CPU to an R-CPU or H-CPU. You cannot downgrade
the firmware of an R/H-CPU to a standard or F-CPU either.
We recommend that you always update to the latest firmware version available for the
respective article number. The previous versions of the firmware are only intended as a
backup to enable you to downgrade to the original version.
A firmware update has no effects on the user program of the CPU on which the update was
performed. However, a downgrade can have effects on the user program if you use new
functions in the user program which were not yet supported by the firmware of the CPU.
The following entry (https://support.industry.siemens.com/cs/de/en/view/109478459) lists all
firmware versions for the CPUs including displays. You will also find a description of the new
functions of the respective firmware versions.
S7-1500R/H redundant system
System Manual, 01/2024, A5E41814787-AF
Maintenance
14.4 Firmware update
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