Forced Checking Procedure (Test Stop) - Siemens SINAMICS S120 Function Manual
Safety integrated
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Description of Safety Integrated functions
4.1 Safety Integrated basic functions
4.1.5
Forced checking procedure (test stop)
Forced checking procedure or test of the switch-off signal paths (test stop) for Safety Integrated Basic
Functions
The forced checking procedure (test stop) at the switch-off signal paths is used to detect
software/hardware faults at both monitoring channels in time and is automated by means of
activation/deactivation of the "Safe Torque Off" (STO) or "Safe Stop 1" (SS1) function.
To fulfill the requirements of ISO 13849-1 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. This functionality must be implemented using the forced checking
procedure (test stop), triggered either in the manual mode or by the automated process.
A timer ensures that forced checking procedure (test stop) is carried out in a timely fashion.
● p9659 SI forced checking procedure, timer.
A forced checking procedure (test stop) must be performed on the switch-off signal paths at
least once during the time set in this parameter.
Once this time has elapsed, an alarm is output and remains active until forced checking
procedure (test stop) is carried out.
The timer returns to the set value each time the STO/SS1 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. The user is therefore
only informed that the forced checking procedure (test stop) is due in the form of an alarm,
which requests the user to perform forced checking procedure (test stop) at the next possible
opportunity. This alarm does not affect machine operation.
The user must set the time interval for carrying out forced checking procedure (test stop) to
between 0.00 and 9000.00 hours depending on the application (factory setting: 8.00 hours).
Examples of when the forced checking procedure (test stop) must be performed:
● When the drives are at a standstill after the system has been switched on (POWER ON).
● When the protective door is opened.
● At defined intervals (e.g. every 8 hours).
● In automatic mode (time and event dependent).
● The maximum time interval is one year (8760 hours).
Forced checking procedure (test stop) can be automatically executed at POWER ON.
● If the forced checking procedure (test stop) as well as the test of the F-DO for the CU310-
2 are to be executed automatically, then set p9507.6 = 1. When testing the F-DO of the
CU310-2, you must parameterize p10042 and activate the test in p10046.
● If the forced checking procedure (test stop) of the F-DI and F-DO of the TM54F is to be
executed automatically, then set p10048 = 1.
● If you have parameterized the forced checking procedure (test stop) for POWER ON, you
can still initiate a forced checking procedure (test stop) at any time as part of the
engineered application.
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Function Manual, 12/2018, 6SL3097-5AR00-0BP1
Safety Integrated
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