Siemens SINUMERIK 840Di Diagnostic Manual page 471

11/2006
27100 At least one axis is not safely referenced
Definitions: There are two reasons for this alarm:
- the machine position of at least one of the axes monitored with SI has not yet been acknowledged
by the user, or
- the machine position of at least one of the axes monitored with SI has not yet been verified through
follow-up referencing.
Even if the axis is already referenced, there is no confirmation that referencing has supplied the
correct result. For example, wrong results can occur if the axis was moved after the control was
switched off, with the result that the standstill position saved prior to switching off is no longer correct.
To make sure that this does not happen, the user must acknowledge the displayed actual position
after the first referencing process.
When the user enable has first been set, follow-up referencing must be carried out each time the
control is booted (with absolute encoders, this follow-up referencing is executed automatically). This
procedure is carried out to verify the standstill position saved prior to switching off of the control.
Via the MD $MN_SAFE_ALARM_SUPPRESS_LEVEL (MD>=3), the alarm display can be set in such
a way that an alarm is given for each axis individually which has not been safely referenced.
Reaction: Alarm display.
SGA "Axis safely referenced" is not set. SE will be switched off, if the actual safety position has not
yet been confirmed by a user agreement. If the user agreement has been set, SE will remain active.
The safe cams are calculated and output. However, their significance is limited as referencing has not
been confirmed.
Remedy: Move all SI axes to known positions and change to "Referencing" mode. Check the positions on the
machine displayed in the user confirmation field and set "User confirmation" via the selection/toggle
key. If the user confirmation for the axes has already been set, reference the axes again.
Changing the user confirmation will be possible only in key switch position 3 or after password entry
Program Alarm display showing cause of alarm disappears. No further operator action necessary.
Continuation:
27101 Axis %1 difference in function safe operational stop, NCK: %2 drive: %3
Parameters: %1 = Axis number
%2 = Monitoring status safe operating stop
%3 = Monitoring status safe operating stop
Definitions: During cross-comparison of result list 1 a difference was detected between the NCK and drive
monitoring channels in the status of safe operating stop monitoring.
Safe operating stop: Bit 0,1 in result list 1
Monitoring status (%2, %3):
- OFF = Monitoring is inactive in this monitoring channel
- OK = Monitoring is active in this monitoring channel, limit values are not violated
- L+ = Monitoring is active in this monitoring channel, upper limit exceeded
- L- = Monitoring is active in this monitoring channel, lower limit exceeded
Reaction: Alarm display.
If a safe monitoring was active, STOP B was also triggered automatically. In this case, a power
OFF/ON of the control will be required.
Remedy: Check whether the safe inputs have switched to the same status in both monitoring channels within
the permissible time tolerance.
For further diagnostics, the drive machine data 1391, 1392 and the servo trace signals "Result list 1,
NCK" and "Result list 1, drive" can be used.
Program Clear alarm with the RESET key. Restart part program
Continuation:
© Siemens AG, 2006. All rights reserved
SINUMERIK, SIMODRIVE Diagnostics Manual (DA), 11/2006 Edition
Overview of Alarms
NCK alarms
2-471