Forced Dormant Error Detection - Siemens SINAMICS S120 Function Manual

Safety Integrated basic functions
9.1 General information
● p10062 SI password new TM54F
● p10063 SI password acknowledgement TM54F
9.1.4

Forced dormant error detection

Forced dormant error detection or test for the switch-off signal paths
Forced dormant error detection for the switch-off signal paths is used for detecting errors in
the software/hardware of the two monitoring channels as quickly as possible and is carried
out automatically when the "Safe Torque Off" function is activated/deactivated.
To fulfill the requirements of EN 954-1 regarding timely error detection, the two switch-off
signal paths must be tested at least once within a defined time to ensure that they are
functioning properly. For this purpose, forced dormant error detection must be triggered
manually or is automatically initiated by the process.
A timer ensures that forced dormant error detection is carried out as quickly as possible.
● p9659 SI timer for the forced dormant error detection
Forced dormant error detection must be carried out at least once during the time set in this
parameter.
Once this time has elapsed, an alarm is output and remains present until forced dormant
error detection is carried out.
The timer returns to the set value each time the STO function is deactivated.
When the appropriate safety devices are implemented (e.g. protective doors), it can be
assumed that running machinery will not pose any risk to personnel. For this reason, only an
alarm is output to inform the user that a forced dormant error detection run is due and
request that this be carried out at the next available opportunity. This alarm does not affect
machine operation.
The user must set the time interval for carrying out forced dormant error detection to
between 0.00 and 9000.00 hours depending on the application (factory setting: 8.00 hours).
When to carry out forced dormant error detection:
● When the drives are at a standstill after the system has been switched on.
● When the protective door is opened.
● At defined intervals (e.g. every 8 hours).
● In automatic mode (time and event dependent)
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NOTICE
If, while the Extended Functions are used, the associated forced dormant error detection
is performed, the time of the Basic Functions will also be reset. The respective alarm of
the Basic Functions is not generated.
While STO is selected through the Extended Functions, the terminals for the selection of
the Basic Functions are not checked for any discrepancy. This means that the test stop
of the Basic Functions must always be performed without the simultaneous selection of
STO or SS1 by the Extended Functions. Otherwise it is impossible to check the correct
control through the terminals.
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
Drive Functions