Siemens SINAMICS S120, Function Manual

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Safety Integrated Basic Functions
10.2 General information
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
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Overview of important parameters for "Password" (see SINAMICS S120/S150 List Manual)
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p9761 SI password input
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p9762 SI password new
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p9763 SI password acknowledgment
10.2.5 Forced checking procedure (test stop)
Forced dormant error detection or test of the switch-off signal paths (test stop) 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).