Siemens Sinumerik 840D sl Function Manual page 811

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Note
When MD10089 is changed, for the drive--independent ESR function, the value
must also be transferred to the drives. This is realized using the "Copy SI Data"
function. The "Confirm SI data" softkey is used to confirm the checksums (this is
also necessary). Further, the user must also enter the values into drive parameters
p9697 and p9897. Before this,"Activate drive commissioning" softkey must be
pressed. After changing the data, by pressing the "Deactivate drive
commissioning" softkey, the checksums are automatically acknowledged and
saved by "Save".
After communication to the drive monitoring channel has failed, the delay timer to
cancel the pulses is started if
S a pulse cancellation delay has been parameterized using
$MN_SAFE_PULSE_DIS_TIME_BUSFAIL
S an SG stage with machine protection is active
MD36963 $MA_SAFE_VELO_STOP_REACTION (for the individual SG stages)
or MD36961 $MA_SAFE_VELO_STOP_MODE (for all SG stages together)
and the corresponding drive parameter assignment (p9563, p9561).
The criterion for a communication failure to the drive is when the sign--of--life
between the NCK and drive monitoring channel fails twice. This leads to Alarm
27050 "Axis %1 failure SI communication".
Behavior of the axis--specific NCK monitoring channel
If a pulse suppression delay is parameterized using
$MN_SAFE_PULSE_DIS_TIME_BUSFAIL, after a communication failure, the
SGA of all axis--specific SI monitoring channels are first left in their old state. All
SGAs are deleted after this delay time has expired. The axis--specific monitoring
functions are no longer processed immediately after communication fails as the
basis for the monitoring functions, the safe actual value, is no longer available.
In the following cases, in the event of a communication failure, the axis--specific
NCK--SGA are immediately deleted, even if a delay time is parameterized in
$MN_SAFE_PULSE_DIS_TIME_BUSFAIL:
-- a) an external STOP A is selected
-- b) a test stop is selected
-- c) the function SBH is or will be selected
-- d) An SG stage is selected or will be selected, where it was previously ex-
plicitly specified that in this SG stage no ESR should be performed in the
event of a communication failure (e.g. SG stage for personnel protection),
(see $MA_SAFE_VELO_STOP_REACTION or
$MA_SAFE_VELO_STOP_MODE).
Since the NCK monitoring channel is assigned to the shutdown path of the Motor
Module, the Motor Module must also know whether, in the event of communication
failure, the pulses should be canceled with a delay. The NCK cyclically provides
the Motor Module with this information. If the Motor Module detects a communica-
tion failure, dependent on the latest information of the NCK, it starts its delay timer
with the parameterized time from p9897 and then independently deletes the
pulses.
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
11.10 Behavior of Safety Integrated when the communication fails
Interaction with other functions
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