Behavior Of Safety Integrated When The Communication Fails - Siemens Sinumerik 840D sl Function Manual

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11.10Behavior of Safety Integrated when the communication fails

11.10 Behavior of Safety Integrated when the communication
fails
When the communication required for the SI fails between the drive and the NCK,
then both channels cancel the pulses. Under certain circumstances, this can be
delayed to enable retraction motion.
11.10.1 Delayed pulse cancellation in the event of communication
failure
Responses integrated in the drive can also be configured using the function
"extended stop and retract" (ESR). In this case, for each axis it is defined whether:
S the axis should continue to operate with a constant speed setpoint for a para-
meterized time and only then should braking be initiated (stop)
S the axis should continue to operate with a parameterized velocity for a para-
meterized time and then be braked along the current limit (retract)
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, moni-
toring 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, since 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 para-
meterization p9580 SI Motion, 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.
11-810
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
© Siemens AG 2015 All Rights Reserved
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