4.21
Forced checking procedure/test stop
The functions and switch-off signal paths must be tested at least once within a defined period
to establish whether they are working properly in order to meet the requirements of EN ISO
13849-1 and IEC 61508 in terms of timely error detection.
The maximum permissible interval for a test stop/forced checking procedure for Basic and
Extended Functions is 8760 hours; i.e. the forced checking procedure must be performed at
least once per year.
This functionality must be implemented by initiating a test stop/forced checking procedure
either in the cyclic manual mode or as part of an automated process.
The test stop cycle is monitored. When the parameterized timer expires (also after POWER
ON / warm restart), alarm A01697: "SI Motion: Test of motion monitoring required" is generated
and a status bit is set which can be transferred to an output or to a PZD bit via BICO. This alarm
does not affect machine operation.
4.21.1
Examples for when the forced checking procedure is carried out
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, an alarm
is only output to inform the user that a forced checking procedure run is due and to request that
this be carried out at the next available opportunity.
Examples of when to carry out forced checking procedure:
● When the drives are at a standstill after the system has been switched on (POWER ON).
● Before the protective door is opened.
● At defined intervals (e.g. every eight hours).
● In automatic mode (time and event dependent).
Safety functions integrated in the drive
4.21 Forced checking procedure/test stop
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB
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