Siemens SINAMICS S120 Function Manual page 90

Safety Integrated Extended Functions
5.10 Safety faults
Priorities of stop responses and Extended Functions
Table 5- 4 Priorities of stop responses and Extended Functions
Stop response/
Extended Function
Highest STO
priority
..... SS1
... SS2
.. SOS
Lowest SLS
priority
1) The SOS monitoring function remains active, although the fault response in the event of a fault can no longer be
triggered because it is already present.
2) STOP B is the subsequent stop of STOP F, which is activated after a parameterizable time. STOP F alone does not
have any effect; the active safety function is still present.
3) The SLS monitoring function remains active, although the fault response in the event of a fault can no longer be
triggered because it is already present.
4) SLS remains active during the braking phase, after which the system switches to SOS.
The table above specifies which stop response or safety function is set when a STOP is
triggered when a safety function is active. The STOPs are arranged here from left to right in
descending order of priority (STOP A-F).
No overall priority is assigned in the individual safety functions. SOS remains active, for
example, even if STO is requested. The safety functions that cause the drive to decelerate
(STO, SS1, SS2) are specified from top to bottom in descending order of priority.
If a field contains two entries, the stop responses and safety functions have the same
priority. Explanation:
● STOP A corresponds to STO
● STOP B corresponds to SS1
● STOP C corresponds to SS2
● When the SS2 function is active, STOP F results in subsequent stop B. SS2 remains
Examples for illustrating the information in the table:
1. Safety function SS1 has just been selected. STOP A remains active; a STOP B operation
2. The SLS safety function is selected. This selection does not modify the function of STOP
3. Stop response, STOP C is selected. If the STO or SS1 safety functions are active, this
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Highest priority
STOP A STOP B
STOP A / STO STO
STOP A STOP B / SS1
STOP A STOP B
STOP A STOP B
1)
STOP A STOP B
3)
active.
that is currently in progress is not interrupted by this. Any remaining STOP C-F would be
replaced by SS1.
A-D. A STOP F now triggers a STOP B because a safety function has been activated.
does not have any effect. If SS2 is active, this braking ramp is retained. If SOS is active,
SOS remains effective, which is also the end status of STOP C. When SLS is selected,
the drive is decelerated with STOP C.
... ...
STOP C
STO
SS1
STOP C / SS2
SOS
1)
STOP C
3) 4)
Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
... Lowest
priority
STOP D STOP F
STO STO
SS1 SS1
SS2 SS2 / STOP B
SOS STOP B
STOP D STOP B
4)
Safety Integrated
2)
2)
2)