Siemens SINAMICS G120 List Manual page 1062

4 Faults and alarms
4.2 List of faults and alarms
A01774 SI Motion P1 (CU): Test stop for fail-safe digital outputs required
Message class: Safety monitoring channel has identified an error (10)
Reaction: NONE
Acknowledge: NONE
Cause: The time set in p10003 for the forced checking procedure (test stop) for the fail-safe digital outputs has been
exceeded. A new forced checking procedure is required.
After the next time the forced checking procedure is selected, the message is withdrawn and the monitoring time is
reset.
Note:
- this message does not result in a safety stop response.
- the test must be performed within a defined, maximum time interval (p10003, maximum of 8760 hours) in order to
comply with the requirements as laid down in the standards for timely fault detection and the conditions to calculate
the failure rates of safety functions (PFH value). Operation beyond this maximum time period is permissible if it can
be ensured that the forced checking procedure is performed before persons enter the hazardous area and who are
depending on the safety functions correctly functioning.
See also: p10003 (SI Motion forced checking procedure timer)
Remedy: Carry out the forced checking procedure for the digital outputs.
The signal source to select the forced checking procedure is set via binector input p10007.
Note:
F-DO: Fail-safe Digital Output
See also: p10007 (SI Motion forced checking procedure F-DO signal source)
A01788 SI: Automatic test stop waits for STO deselection via motion monitoring functions
Message class: Safety monitoring channel has identified an error (10)
Reaction: NONE
Acknowledge: NONE
Cause: The automatic test stop (forced checking procedure) was not able to be carried out after powering up.
Possible causes:
- the STO function is selected via safe motion monitoring functions.
- a safety message is present, that resulted in a STO.
Note:
STO: Safe Torque Off
Remedy: - deselect STO via safe motion monitoring functions.
- remove the cause of the safety messages and acknowledge the messages.
Note:
The automatic test stop is performed after removing the cause.
A01790 SI: Power up stopped due to STO via terminals
Message class: Safety monitoring channel has identified an error (10)
Reaction: NONE
Acknowledge: NONE
Cause: When powering up, the automatic internal self test of the Control Unit was not able to be completed as the pulses
were not enabled. It is possible that the "STO via terminals at the Power Module" function is being used, and STO is
selected in at least one hardware switch-off signal path at the Power Module.
Remedy: - Deselect STO via the STO terminals at the Power Module (connect STO_A and STO_B to 24 V).
- if required, deactivate the "STO via terminals at the Power Module" function via the DIP switch (both DIP switches
set to "OFF").
Note:
- After the cause has been removed, the Control Unit continues to power up.
- While the alarm remains, a possibly existing brake is kept closed.
STO: Safe Torque Off
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SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890