Siemens Sinumerik 840D sl Function Manual page 141

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Note
For STOP F, when monitoring functions are active (SBH, SG, SE, not "n<n
however, "Synchronization, hysteresis and filtering "n<n
current limit with speed setpoint = 0) is defined as the following stop.
Warning
!
If an internal or external fault occurs, as a result of the fault, during the STOP F
response the parameterized safety functions are either no longer available or only
with restrictions. This must be carefully taken into account when parameterizing
the delay time between STOP F and STOP B (MD36955 / p9555) and must be
taken into account in the risk analysis performed by the machine manufacturer.
This applies in particular to vertical axes.
Note
A delay time between STOP F and STOP B should only be set, if, during this time,
an alternative response is initiated by evaluating the system variables
$VA_XFAULTSI and $A_XFAULTSI.
Further, when using the delay time, a monitoring function should always be active
-- also in the automatic mode (e.g. SE, SN, SG with high limit switch). For
example, if the SBH monitoring function is only active on the drive side, for
example because of the (single--channel) failure of a door switch, then although
this results in a STOP F, the STOP F --> STOP B delay time on the NCK side is
not started if previously no monitoring function was active. This means that in this
case, the drive responds with a STOP B (however this is also initiated in the NCK
due to the exchange of the stop responses), but this is not displayed in the NCK
variables $VA_XFAULTSI and $A_XFAULTSI.
The appropriate monitoring functions of the drive (e.g. when SBH is selected) are
also executed instantaneously without any delay.
Note
The ESR integrated in the drive can by triggered by writing to the system variable
$AN_ESR_TRIGGER (see also Function Manual 3, M3 "Axis couplings"). The
STOP F delay time in MD36955 $MA_SAFE_STOP_SWITCH_TIME_F or drive
parameter in p9555 should be selected, so that the timer for ESR in p0892 is
covered by the SINAMICS basic system.
See also Chapter 11.10.1 "Delayed pulse cancellation in the event of a
communication failure".
© Siemens AG 2015 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Safety functions integrated in the system/drive
"), STOP B (braking at the
x
6.3 Safe Stops A- -F
",
x
6-141