Siemens Sinumerik 840D sl Function Manual page 617

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Table 10-1 Global checksums, continued
Safety--relevant hardware
checksum
Data are determined and the checksums are calculated when the dialog is
displayed.
The calculation of the checksums depends on the expansion stage of the control
system and can take longer than 10 seconds. During the calculation, a progress
bar is displayed, which indicates which global checksums are presently being cal-
culated and which MD or parameters are presently being read from which axis or
which drive object.
The progress dialog can be exited using the "Cancel" softkey which then also
means that the calculation of the checksums is canceled. The global checksums
dialog remains empty and the following text appears in the dialog window:
"No data can be displayed, as the calculation of the global checksums has been
aborted". A new calculation of the global checksums is realized with the "Display
new" softkey.
The "Display new" softkey is only displayed if the calculation of the global check-
sums was canceled. In this case, the "Details" softkey is also inactive.
The checksums are calculated across all SI for which the following applies:
MD36901 $MA_SAFE_FUNCTION_ENABLE, bit 0 == 1. If there is no axis for
system--integrated operation, the "Safety integrated system integrated" part in the
table is omitted10-1.
If, when calculating the checksums, there is a number overflow, then the overflow
is rejected. For all checksums, at the end of the calculation, the date is entered in
the particular global checksum.
Master checksums are displayed using the "Details" softkey.
The Details dialog is updated with the cursor keys up and down. The cursor can
only be positioned to lines that contain a checksum.
The safety--relevant hardware checksum has only one master checksum. In the
Details menu, only one line is displayed with this checksum.
Using the "Back" softkey, you can change to the vertical softkey bar of the Safety
diagnostics.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Master checksum
Drive--based master check-
sum
Safety--relevant hardware
checksum
10.1 Troubleshooting procedure
Calculated by adding the listed data
r9798
r9898
(Sum across all drives, that are assigned to an axis
with $MA_SAFE_FUNCTION_ENABLE.0==1)
$MA_SAFE_ACT_CHECKSUM[1]
(Sum across all axes with
$MA_SAFE_FUNCTION_ENABLE 0==1)
r9728[2]
(Sum across all drives, that are assigned to an axis
with $MA_SAFE_FUNCTION_ENABLE.0==1)
Diagnostics
10-617