Forced Dormant Error Detection - Siemens SINAMICS S120 Function Manual

Safety Integrated Extended Functions

5.13 Forced dormant error detection

5.13 Forced dormant error detection
Forced dormant error detection and function test through test stop
The functions and switch-off signal paths must be tested at least once within a defined time
interval in order to meet requirements as per EN ISO 13849-1 (2006) and IEC 61508 in
terms of timely fault detection.
The maximum permissible interval for forced dormant error detection with the Basic and
Extended Functions is 9000 hours or once a year.
This functionality must be implemented by means of test stop triggering either in cyclic
manual mode or by the automated process.
The test stop cycle is monitored. On expiration of the programmed timer, the 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.
The test stop must be initiated application-specific and be executed at a time which suits
application requirements. This functionality is implemented by means of a single-channel
parameter p9705 which can be wired via BICO either to an input terminal on the drive unit
(CU), or to an IO-PZD in the drive telegram.
● p9559 SI Motion Forced dormant error detection timer (Control Unit)
● p9705 BI: SI Motion Test stop signal source
● r9723.0 CO/BO: SI Motion diagnostics signals integrated in the drive
A test stop does not require POWER ON. The acknowledgment is set by canceling the test
stop request.
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, only an
alarm is output to inform the user that a forced dormant error detection run is due and to
request that this be carried out at the next available opportunity.
Examples of when to carry out forced dormant error detection:
● When the drives are at a standstill after the system has been switched on.
● Before the protective door is opened.
● At defined intervals (e.g. every 8 hours).
● In automatic mode (time and event dependent)
Note
STO is triggered when a test stop is carried out for the Safety functions. It is not permissible
to select STO before selecting the test stop and the axis must not be in operation.
When using blocksize Power Modules, the test stop must be initiated at closed-loop
controlled standstill (speed setpoint of 0, current is flowing through the motor).
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Function Manual, (FHS), 11/2009, 6SL3097-4AR00-0BP0
Safety Integrated