What it means
A01678 is raised by the Safety Integrated (SI) monitoring channel: the time set in p9661 to monitor the forced checking procedure — the test stop — for the "STO via the terminals at the Power Module" function has been exceeded, so a new forced checking procedure is due. According to the manual, this message does not result in a safety stop response
. The test must be carried out within a defined maximum interval (p9661 allows at most 9000 hours) so that timely fault detection meets the requirements laid down in the standards and the failure rates of the safety functions (PFH value) can be calculated correctly. The manual adds: 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.
Depending on the drive's configuration, the same condition can also be issued as the fault F01678 instead of this alarm.
Why it appears
- The monitoring time set in p9661 for the forced checking procedure (test stop) of the "STO via terminals at the Power Module" function has been exceeded.
- A new forced checking procedure is therefore required.
What to check
- Select the "STO via terminals at the Power Module" function.
- Deselect the function again: after the next deselection the message is withdrawn and the monitoring time is reset.
- If you want to see how much time remains until the next test stop, read r9662, which displays the remaining time of the monitoring interval.
Parameters the manual names
- p9661 — sets the monitoring time for the forced checking procedure (test stop) for STO via the PM terminals; a maximum of 9000 hours is permitted. A01678 appears when this time is exceeded.
- r9662 — shows the remaining time before the forced checking procedure (test stop) for STO via the PM terminals becomes due again.
Acknowledging and restarting
The alarm does not have to be acknowledged manually. It clears itself: after the next time the "STO via terminals at the Power Module" function is deselected, the message is withdrawn and the monitoring time is reset, so a fresh interval begins.
The same on every family
Every manual that describes A01678 gives it the same reaction, acknowledgement and message class.
| Drive family | Reaction | Acknowledge | Message class | Component | Manual |
|---|---|---|---|---|---|
| G120 | NONE | NONE | Safety monitoring channel has identified an error (10) | — | SINAMICS G120 · p. 847 |
The drives this code lives on
A01678 is described for G120. These are the converters of those families in our catalogue — price on request.
Questions technicians ask
How do I clear A01678 on a SINAMICS G120?
Select the "STO via terminals at the Power Module" function and then deselect it again. The message withdraws after the next deselection and the monitoring time is reset, so no manual acknowledgement is needed.
How often must the test stop for STO via the PM terminals be performed?
Within the interval set in p9661, which allows at most 9000 hours, in order to comply with the standards for timely fault detection and the conditions for calculating the PFH value of the safety functions.
Does A01678 stop the drive or trigger a Safe Torque Off?
No. The manual states that this message does not result in a safety stop response; it only demands a new forced checking procedure.
How can I see how much time is left before the test stop is due?
Read r9662, which shows the remaining time of the monitoring interval for the forced checking procedure of STO via the PM terminals.
Codes next to this one
Source
Written from Siemens' own List Manuals and operating instructions; every number, designation and parameter on this page is checked against them before publication.
All SINAMICS codes: fault and alarm codes · the A01xxx group · SINAMICS manuals · Siemens manuals