N O T I C E
The availability of the signals over safe fieldbus depends on the used fieldbus protocol. Refer to chapter Safe fieldbuses for more
information.
Table 33: The SS2 and SOS Signals
Activation and deactivation of the signal
Activation:
SS2 is requested and starts execution.
Deactivation (manual acknowledgment):
Acknowledgment signal received after SS2 is not requested.
Deactivation (automatic acknowledgment):
SS2 request ends.
Deactivation (SS2 violation situations):
Reset signal received after SS2 had detected a violation and SS2 has been acknowledged
(implicitly or explicitly).
The signal indicates
if SS2 function is
being executed.
Only activated when SS2 has not detected any violations.
Activation:
Time SS2 t1 elapses (only time monitoring used). OR
Speed is below zero speed for time SS2 td2 (zero speed monitoring used).
Deactivation (manual acknowledgment):
SS2 is acknowledged after being reached successfully.
Deactivation (automatic acknowledgment):
SS2 was reached successfully and SS2 request ends.
Deactivation (violation or fault):
A violation or fault occurs during the reached state of SS2.
Deactivation (higher priority function is requested)
STO or SS1 or SQS is requested.
The signal indicates
if SS2 function has
been reached suc-
cessfully.
Activation:
SS2 Reached is activated.
Deactivation:
SS2 Reached is deactivated. OR
SOS detects a violation.
The signal indicates
if SOS function is
being executed.
AQ319736045637en-000101 / DPD01798 | 81Danfoss A/S © 2021.06
Safety Functions
VACON® NXP Advanced Safety Options
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