Siemens SINUMERIK 840D Diagnostics Manual page 398

1 Alarms
27100
Definitions:
Reactions:
Remedy:
Program Continuation:
27101
Parameters:
Definitions:
Reactions:
Remedy:
Program Continuation:
1-398
At least one axis is not safely referenced
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 veri-
fied through follow-up referencing.
Even if the axis is already referenced, there is no confirmation that referencing has sup-
plied 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.
- Alarm display.
SGA "Axis safely referenced" is not set. SE will be switched off, if the actual safety posi-
tion 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 signifi-
cance is limited, as referencing has not been confirmed.
Move all SI axes to known positions and change to "Referencing" mode. Check the posi-
tions 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, ref-
erence the axes again.
Changing the user confirmation will be possible only in key switch position 3 or after pass-
word entry
Alarm display showing cause of alarm disappears. No further operator action necessary.
Axis %1 difference in function safe operational stop, NCK: %2 drive: %3
%1 = Axis number
%2 = Monitoring status safe operating stop
%3 = Monitoring status safe operating stop
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
- 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.
Check whether the safe inputs have switched to the same status in both monitoring chan-
nels 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.
Clear alarm with the RESET key. Restart part program
 Siemens AG, 2004. All rights reserved
SINUMERIK 840D/840Di/810D Diagnostics Guide (DA), 10.04 Edition
10.04