Siemens SINUMERIK 840D sl Function Manual page 542

Commissioning
10.5 Changing machine data
Change log
Changes made to NCK machine data important for Safety Integrated are recorded in a display
data. The time that the change is made is displayed in
an axis 36996 $MA_SAFE_CONFIG_CHANGE_DATE[0...6] and
an NCK-MD13316 $MN_SAFE_GLOB_CFG_CHANGE_DATE[0...6].
This MD can neither be overwritten by manual entry nor by loading an MD archive. The only
way to delete this MD is to boot the control from the general reset mode (service switch position
1).
This data is updated when the following changes are made to the NCK machine data:
● A modified safety MD configuration is activated
(NCK Safety MD have been changed and acknowledged by correction of
$MA_SAFE_DES_CHECKSUM or $MN_SAFE_GLOB_DES_CHECKSUM). Changes,
depending on the modified MD context (axis-specific MD or NCK-MD), are listed in MD
$MN_SAFE_GLOB_CONFIG_CHANGE_DATE or in MD
$MA_SAFE_CONFIG_CHANGE_DATE.
● Changes in the S7 configuration regarding PROFIsafe-relevant parameters. These are all
of the values that go into the PROFIsafe CRC1 (e.g. PROFIsafe source and target address,
PROFIsafe monitoring time). Changes are listed in MD
$MN_SAFE_GLOB_CONFIG_CHANGE_DATE.
● When MD $MA_SAFE_FUNCTION_ENABLE is changed from values not equal to zero to
zero, or from zero to values not equal to zero. These changes mean that the safety
functionality of an axis is completely enabled/disabled. Changes are listed in MD
$MN_SAFE_CONFIG_CHANGE_DATE.
Other changes to MD $MA_SAFE_FUNCTION_ENABLE (selecting/deselecting individual
safety functions) always change MD $MA_SAFE_ACT_CHECKSUM, which themselves
have to be acknowledged by changes to MD $MA_SAFE_DES_CHECKSUM. Changes are
listed in MD $MA_SAFE_CONFIG_CHANGE_DATE.
● When MD $MA_SAFE_FUNCTION_ENABLE is changed by reducing the safety option. If
the scope of axis-specific safety functions is enabled for more axes than are set in the safety
option data, the function enable for the excess number of axes is automatically cancelled
again when the control boots.
This deletion is noted in MD $MA_SAFE_CONFIG_CHANGE_DATE. Further, the operation
is associated with the initiation of Alarm 8041 "Axis %1: MD %2 reset, the associated option
is not sufficient". This alarm disappears at the next power on, however the entry in MD
$MA_SAFE_CONFIG_CHANGE_DATE is kept.
● Loading an MD archive that is different to the currently active NCK-MD block.
● When upgrading (corresponds to downloading an MD archive)
● Series commissioning (corresponds to downloading an MD archive)
Supplementary conditions
Changes to the MD configuration are only noted/documented when the change becomes
active, i.e. after altering MD $MA_SAFE_DES_CHECKSUM /
$MN_SAFE_GLOB_DES_CHECKSUM and a subsequent power on.
542
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated