Safety Integrated Global Checksums - Siemens SINUMERIK 840D sl Function Manual

Diagnostics
11.1 Troubleshooting procedure
Figure 11-22
11.1.2

Safety Integrated global checksums

The number of checksums to be checked at a machine is reduced through the introduction of
master checksums.
All of the checksums of an axis - or also all axes - are added in these master checksums. This
means that users only have to compare one checksum in order to check whether something
has changed since the last time it was determined. As a consequence, the master checksum
is not saved, but when required, is recalculated each time.
The global checksums for Safety Integrated are shown in the Diagnostics operating area as
dedicated dialog in the existing checksums screen. The global checksums are determined and
the dialog is displayed by pressing the "Checksum SI" vertical softkey. The previous SI
checksum dialog is kept, and can be accessed from the "Global checksum" dialog by pressing
vertical softkey "Axis/drive checksum". (For a comparison, see diagram, "Status SI").
The navigation branches as follows:
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Details of the F-modules
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated