Safety Integrated Functions
8.4 Safety Integrated Basic Functions
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
359
8.4.4 Safety faults
The fault messages for Safety Basic Functions are stored in the standard message buffer
and can be read from there. In contrast, the fault messages for Safety Integrated Extended
Functions are stored in a separate safety message buffer (see section "Message buffer").
When faults associated with Safety Integrated Basic Functions occur, the following stop
responses can be initiated:
Table 8- 9 Stop responses to Safety Integrated Basic Functions
Stop response Triggered ... Action Effect
STOP A cannot be
acknowledged
For all non-
acknowledgeable
safety faults with
pulse suppression.
STOP A For all
acknowledgeable
safety faults with
pulse suppression.
As a follow-up
reaction of STOP F.
Trigger safe pulse
suppression via the
switch-off signal path for
the relevant monitoring
channel. During operation
with SBC:
apply motor holding
brake.
The motor coasts to a
standstill or is braked by the
holding brake.
STOP A corresponds to Stop Category 0 in accordance with 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-circuiting, holding or operational
brake).
When STOP A is active, "Safe Torque Off" (STO) is effective.
STOP F If an error occurs in the
data cross-check.
Transition to STOP A. Follow-up reaction STOP A
with adjustable
delay (default setting without
delay) if one of the safety
functions is selected
STOP F is permanently assigned to the data cross-check (DCC). In this way,
errors are detected in the monitoring channels.
After STOP F, STOP A is triggered.
When STOP A is active, "Safe Torque Off" (STO) is effective.
WARNING
With a vertical axis or pulling load, there is a risk of uncontrolled axis movements when
STOP A/F is triggered. This can be prevented by using "Safe Brake Control (SBC)" and a
holding brake (not a safety brake!) with sufficient holding force.
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