Siemens SINUMERIK 840D sl Function Manual page 76

Safety Functions integrated in the drive
5.7 Commissioning the STO, SBC and SS1 functions
Stop re‐
sponse
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. holding
or operational brake.
When STOP A is present, Safe Torque Off (STO) is active.
STOP F Transition into STOP A (after a delay
time that can be parameterized)
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.
Uncontrolled axis movement
With a vertical axis or a pulling load, there is a danger of uncontrolled movement of the axis
when STOP A/F if triggered. This can be prevented by using Safe Brake Control (SBC) and
a brake with sufficient holding force (not safety relevant).
For mechanically coupled axes, there is a risk of uncontrolled motion if a STOP A/F is not
initiated for all axes of the group.
Acknowledging Safety faults
Faults associated with Safety Integrated Basic Functions must be acknowledged as follows:
1. Remove the cause of the fault.
2. Select/deselect Safe Torque Off (STO).
3. Acknowledge fault.
If the safety commissioning mode is exited when the safety functions are switched off
(p0010 = value not equal to 95 when p9601 = p9801 = 0), all the safety faults can be
acknowledged. Once safety commissioning mode has been selected again (p0010 = 95),
all the faults that were previously present reappear.
Note
Safety faults can also be acknowledged (as with all other faults) by switching the drive unit off
and then on again (power on).
If the fault cause has still not been resolved, then the fault is immediately displayed again after
booting.
76
Action
WARNING
Effect
Follow-up response STOP A with ad‐
justable delay (default setting without
delay) if one of the selected Safety
functions is selected
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Triggered ...
If a fault occurs in the cross‐
wise data comparison.
Safety Integrated