Siemens SINAMICS G120 List Manual page 1158

4 Faults and alarms
4.2 List of faults and alarms
C30770 SI Motion P2: Discrepancy error affecting the fail-safe inputs
Message class: Safety monitoring channel has identified an error (10)
Reaction: NONE
Acknowledge: IMMEDIATELY (POWER ON)
Cause: The fail-safe digital inputs (F-DI) show a different state longer than that parameterized in p10002 / p10102.
Fault value (r0949, interpret binary):
Bit 0: Discrepancy error for F-DI 0
Bit 1: Discrepancy error for F-DI 1
...
Note:
If several discrepancy errors occur consecutively, then this message is only signaled for the first error that occurs.
Remedy: - check the wiring of the F-DI (contact problems).
Note:
This message can be acknowledged via F-DI or PROFIsafe.
Discrepancy errors of an F-DI can only be acknowledged if safe acknowledgment was carried out once after the
cause of the error was resolved (p10106, acknowledgment via PROFIsafe, extended message acknowledgment). As
long as safety acknowledgment was not carried out, the corresponding F-DI stays in the safe state internally.
When the "Extended message acknowledgment" function (p9307.0) is active, the following applies:
If the F-DI assigned for STO or SS1 is in a fail-safe state due to a discrepancy error, then when deselecting via this F-
DI, safe acknowledgment can no longer be executed.
For cyclic switching operations at the F-DI, it may be necessary to adapt the discrepancy time to the switching
frequency.
If the period of a cyclic switching pulse corresponds to twice the value of p10102, then the following formulas should
be checked:
- p10102 < (tp / 2) - td (discrepancy time must be less than half the period minus the actual discrepancy time)
- p10102 >= 12 ms (discrepancy time must be no less than 12 ms)
- p10102 > td (discrepancy time must be greater than the switch discrepancy time that may actually occur)
td = possible actual discrepancy time (in ms) that can occur with a switching operation. It must be at least 12 ms.
tp = period for a switching operation in ms.
When debounce p10117 is active, the discrepancy time is directly specified by the debounce time.
If the period of a cyclic switching pulse corresponds to twice the debounce time, then the following formulas should
be checked.
- p10102 < p10117 + 1 ms - td
- p10102 > td
- p10102 >= 12 ms
Example:
For a 110 ms switching frequency and p10117 = 0, the maximum discrepancy time that can be set is as follows:
p10102 <= (110/2 ms) - 12 ms = 43 ms
Rounded off, p10102 <= 36 ms is obtained (as the discrepancy time is rounded off as a multiple of 12 ms).
Note:
F-DI: Fail-safe Digital Input
A30772 SI Motion P2: Test stop for fail-safe digital outputs running
Message class: Safety monitoring channel has identified an error (10)
Reaction: NONE
Acknowledge: NONE
Cause: The forced checking procedure (test stop) for the fail-safe digital inputs is currently in progress.
Remedy: The alarm is automatically withdraw after successfully ending or canceling (when a fault condition occurs) the test
stop.
Note:
F-DO: Fail-safe Digital Output
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SINAMICS G120 CU250S-2 Control Units
List Manual, 09/2017, A5E33842890