Forced Dormant Error Detection (Test Stop) - Siemens Sinamics S120 Function Manual

Description of Safety Integrated functions
4.1 Safety Integrated basic functions
4.1.5

Forced dormant error detection (test stop)

Forced dormant error detection or test of the switch-off s ignal paths (test s top) for Safety Integrated
Basic Functions
The forced dormant error detection function (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 by means of forced dormant
error detection (test stop), triggered either in manual mode or by the automated process.
A timer ensures that forced dormant error detection (test stop) is carried out in a timely
fashion.
● p9659 SI forced dormant error detection, timer.
A forced dormant error detection (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 dormant error
detection (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. As a consequence, the
user is only made aware of the forced checking procedure (test stop) that is required using
an alarm, and is requested to perform the 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 dormant error detection (test stop)
to between 0.00 and 9000,00 hours depending on the application (factory setting: 8.00
hours).
Examples of when forced dormant error detection (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 dormant error detection (test stop) can be automatically executed at POWER ON.
● If the forced dormant error detection (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 FD-O
of the CU310-2, you must parameterize p10042 and activate the test in p10046.
● If the forced dormant error detection (test stop) of the F-DI and F-DO of the TM54F is to
be executed automatically, then set p10048 = 1.
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Function Manual, (FHS), 07/2016, 6SL3097-4AR00-0BP6
Safety Integrated