Siemens SINUMERIK 840D sl Function Manual page 128

Safety functions integrated in the system/drive
7.3 Safe Stops A-F
Faults/errors are detected and a STOP B/A response is initiated in the drive and control system
(see description of STOP B). The error can only be acknowledged from the drive and control
using a power on.
Exception: If an internal STOP C/D/E is already active, because STOP F has a lower priority
(see Chapter "General (Page 112)", Section "Priority of the stop responses").
● Alarm message:
Alarms 27001 "Defect in a monitoring channel" and/or 2710x "Difference in function..." and
C01711 "SI Motion error in a monitoring channel" are displayed.
For further diagnostics, for Alarm 27001, a fine error coding is displayed in the alarm line.
The fine coding for the drive alarm can be found in r9725 "SI Motion diagnostics for STOP
F" or in the SI status display under STOP F.
The significance of the error code is provided in Chapter "NCK safety alarms for
SINUMERIK 840D sl (Page 595)" under Alarm 27001 "Defect in a monitoring channel".
A delay time before STOP B is initiated can be parameterized using MD36955
$MA_SAFE_STOP_SWITCH_TIME_F. During this time, the machine manufacturer can initiate
an NC controlled response, e.g. ESR. After this time has expired, the involved axis is braked
with STOP B. This is also true if, in the meantime, a stop with a higher priority than STOP F
(STOP E, D, C) is present. The system variables $VA_XFAULTSI and $A_XFAULTSI, bit 1
can be used to detect whether a STOP F was initiated that is then followed by a STOP B. In
the delay time up to the STOP B, an ESR or braking along the programmed path can be initiated
(e.g. by writing to $AC_ESR_TRIGGER or initiating an external STOP D).
During the delay time up to initiating STOP B, additional, non-safety-related monitoring
functions can already result in other braking responses. A STOP D or the initiation of ESR can
be influenced due to harder braking responses of the drive (the same as e.g. the configured
braking response when an encoder fails).
Note
For STOP F, when monitoring functions are active (SBH, SG, SE, not "n<n
"Synchronization, hysteresis and filtering "n<n
speed setpoint = 0) is defined as the following stop.
Delay time
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 (MD3695/p9555) - and must be taken into account in the risk analysis performed
by the machine manufacturer. This applies in particular to vertical axes.
128
WARNING
"), STOP B (braking at the current limit with
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Function Manual, 12/2017, 6FC5397-4BP40-6BA1
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Safety Integrated