Siemens Sinumerik 840D sl Function Manual page 57

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A timer ensures that the forced checking procedure is carried out as quickly as
possible.
S p9659 SI timer for the forced checking procedure
The forced checking procedure of the shutdown paths 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 the for-
ced checking procedure 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. As a
consequence, the user is only made aware of the forced checking procedure that
is required using an alarm, and is requested to perform the forced checking proce-
dure at the next possible opportunity. This alarm does not affect machine opera-
tion.
The user must set the time interval for carrying out the forced checking procedure
to between 0.00 and 9000.00 hours depending on the components used and the
application (factory setting: 8.00 hours).
The 9000 hours are only applicable for STO, SBC, SS1 functions that are integra-
ted in the drive and controlled via local terminals.
When using the safety--related motion monitoring functions according to Chapter 6,
the value should be set to 9000 hours so that the alarm to carry out the forced
checking procedure is no longer output. After carrying out the forced checking pro-
cedure from STO, the forced checking procedure timer is also re--started by the
motion monitoring functions.
Examples for performing the forced checking procedure:
S when the drives are at a standstill after the system has been switched on.
S When the protective door is opened.
S In defined cycles (e.g. every 8 hours).
S In the automatic mode, dependent on time or a specific event.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Safety Functions integrated in the drive
4.1 General information about SINAMICS Safety Integrated
4-57