Siemens Sinumerik 840D sl Function Manual page 614

Sinumerik safety integrated

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10.1 Troubleshooting procedure

Figure 10-22 Details of the F modules

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 recalcu-

lated each time.

The global checksums for Safety Integrated are shown in the Diagnostics operat-

ing area as dedicated dialog in the existing checksums screen. The global check-

sums 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 check-

sum". (For a comparison, see Fig.10-1"Status SI").

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