Siemens SINUMERIK 840D sl Function Manual page 759

The ESR integrated in the drive is configured for fault/error situations where the NC can no
longer enter a setpoint at the drive.
Even when communication fails with the SI functionality active, ESR integrated in the drive is
possible to protect machine. For this purpose, in the NCK monitoring channel and in the drive
monitoring channel, after a communication failure has been identified, pulse cancellation is
delayed in order to permit retraction motion. The selected axis-specific SI functionality (SG,
SE, SBH) at the instant that the communication fails, is still available through one channel in
the drive monitoring channel. For the NCK monitoring channel, due to the missing actual value,
monitoring is no longer possible.
The PLC-SPL remains functional in so much that the drive monitoring channel is not required.
(transport of the drive SGE is interrupted.) However, from the PLC-SPL it is not possible to
select another monitoring function or immediately cancel the pulses via an external STOP A.
Also the NCK-SPL remains functional, since it receives its input variables ($A_INSE) via
PROFIsafe I/O. The selection of another axis-specific monitoring function (e.g. SE level
switchover) remains, however, ineffective, as the axis-specific NCK monitoring functions have
been deactivated.
Activation
The delay time up to pulse cancellation must be set in MD10089
$MN_SAFE_PULSE_DIS_TIME_BUSFAIL and in the corresponding drive parameterization
p9580 "SI Motion, the pulse cancellation delay time after bus failure (CU)" must be
parameterized for values greater than 0. With the default value 0, this function is deactivated;
in the case of a communication failure between the NCK and drive, the pulses are immediately
canceled.
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
pressing "Save".
After communication to the drive monitoring channel has failed, the delay timer to cancel the
pulses is started if
● A pulse cancellation delay is parameterized
using $MN_SAFE_PULSE_DIS_TIME_BUSFAIL
● 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
Safety Integrated
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
12.10 Response of Safety Integrated when the communication fails
Interaction with other functions
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