Siemens SINUMERIK 840D sl Function Manual page 602

Diagnostics
11.2 NCK safety alarms for SINUMERIK 840D sl
27000 Axis %1 is not safely referenced
Parameter %1 = axis name, spindle number
Explanation There are two reasons for this alarm:
● the user has still not acknowledged the machine position,
● the machine position has not yet been verified through follow-up referencing.
Even if the axis is already referenced there is no acknowledgement that referencing has supplied the correct
result. For example, incorrect results can occur if the axis was moved after the control was powered-down -
with the result that the stop position saved prior to powering-down is no longer correct. To ensure that this
does not happen, the user must acknowledge the displayed actual position after the first referencing opera‐
tion.
After the user agreement has been set for the first time, the axis must be subsequently referenced each time
that the control is booted (with absolute encoders, this subsequent referencing is automatically executed).
This procedure is carried out to verify the stop position saved prior to powering-down the control.
The alarm display can be set using MD10094 $MN_SAFE_ALARM_SUPPRESS_LEVEL (MD≥3) so that the
group alarm 27100 is displayed for all SI axes.
Response Alarm display
The SGA "axis safely referenced" is not set. SE is disabled if the safe actual position has not yet been
acknowledged by the user agreement. If the user agreement is set, SE remains active. The Safe Cams are
calculated and output, but their significance is limited because referencing has not been acknowledged.
Remedy Move the axis to a known position, change to the "referencing" mode and press the softkey "Agreement".
Check the positions displayed in the agreement screen at the machine. If these correspond to those expected
at the known position, confirm this using the toggle key. If the user agreement has already been set, re-
reference the axis.
The user agreement can only be changed in key-actuated switch setting 3 or after entering a password.
Warning:
If the axis has not been safely referenced and the user has not issued a user agreement, then the following
applies:
- the Safe Cams are still not safe.
- the safe limit positions are still not active
Program con‐ The alarm is no longer displayed when the alarm cause has been removed. No other operator actions are
tinuation required
602
Function Manual, 12/2017, 6FC5397-4BP40-6BA1
Safety Integrated