Siemens SINUMERIK 840D sl Function Manual page 75

05.08
Table 4-2
Stop
response
STOP A
cannot be
acknowled
ged
STOP A
STOP F
1) If STOP F is output by the crosswise data comparison of the two input signals
when the Safe Torque Off function is selected, this means that the pulses were
canceled when Safe Torque Off was selected on one channel.
Warning
!
With a vertical axis or pulling load, there is a risk of uncontrolled axis movements
when STOP A/F is initiated. This can be prevented by using safe brake control
(SBC) and a brake with sufficient holding force (not safe).
© Siemens AG 2008 All Rights Reserved
SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) – 05.2008 Edition
4.6 Commissioning the STO, SBC and SS1 functions
Safety Integrated stop responses
Action
Initiates safe pulse
cancellation via the
shutdown path of the shutdown path of the
relevant monitoring
channel.
For operation with SBC:
The brake is closed.
STOP A corresponds to Stop Category 0 to EN 60204–1.
With STOP A, the motor is switched directly to zero torque via the Safe
Torque Off (STO) function.
A motor at standstill cannot be started again accidentally.
A moving motor coasts to standstill. This can be prevented by using external
braking mechanisms, e.g. armature short–circuit, holding or operational
brake.
When STOP A is present, Safe Torque Off (STO) is active.
Transition to STOP A
STOP F is permanently assigned to the crosswise data comparison (CDC). In
this way, errors are detected in the monitoring channels.
After STOP F, STOP A is initiated.
When STOP A is present, Safe Torque Off (STO) is active.
Safety Functions Integrated in the Drive
Effect Initiated when
For all safety faults that cannot
be acknowledged with pulse
The motor
cancellation.
coasts to a
standstill or standstill or
For all safety faults that can be
is braked by
acknowledged with pulse
the holding
cancellation.
brake.
As a subsequent response to
STOP F.
If a fault occurs in the crosswise
1)
None
data comparison.
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