Siemens SINUMERIK 840D sl Function Manual page 583

The global checksums are calculated as follows:
Global safety engineer‐
ing checksum
(sum of all master check‐
sums)
Safety-relevant hard‐
ware 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 calculated 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 checksums 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 omitted.
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.
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Master checksum
NC master checksum
Axis master checksum
Drive master checksum
Drive-based master checksum
Safety-relevant hardware checksum $MA_SAFE_ACT_CHECKSUM[1]
11.1 Troubleshooting procedure
Calculated by adding the listed data
SAFE.SPF checksum
$MN_SAFE_GLOB_ACT_CHECKSUM[0]
$MN_SAFE_GLOB_ACT_CHECKSUM[1]
$MN_SAFE_GLOB_ACT_CHECKSUM[2]
$MN_SAFE_GLOB_ACT_CHECKSUM[3]
$MA_SAFE_ACT_CHECKSUM[0]
$MA_SAFE_ACT_CHECKSUM[2]
(Sum across all axes with $MA_SAFE_FUNCTION_ENA‐
BLE.0==1)
r9728[0]
r9728[1]
(Sum across all drives, that are assigned to an axis with
$MA_SAFE_FUNCTION_ENABLE.0==1)
r9798
r9898
(sum across all drives, which are assigned to one axis with
$MA_SAFE_FUNCTION_ENABLE.0==1)
(Sum across all axes with $MA_SAFE_FUNCTION_ENA‐
BLE 0==1)
r9728[2]
(Sum across all drives, that are assigned to an axis with
$MA_SAFE_FUNCTION_ENABLE.0==1)
Diagnostics
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