Sinumerik Alarm 16820 Channel %1 block %2 traverse instruction ACN for axis %3 not allowed
Parameters:
%1 = Channel number
%2 = Block number, label
%3 = Axis name, spindle number
Definitions:
The keyword ACN (Absolute Coordinate Negative) is only allowed for “modulo axes”. It causes approach of the programmed absolute position in the specified direction.
Reactions:
– Alarm display.
– Interface signals are set.
– Interpreter stop
– NC Start disable in this channel.
Remedy:
Please inform the authorized personnel/service department. In the displayed NC block, replace the keyword ACN by specifying AC (Absolute Coordinate). If the alarm display is based on an incorrect axis definition, the axis with the axis-specific MD 30300: IS_ROT_AX and MD 30310: ROT_IS_MODULO can be declared a rotary axis with modulo change. Corresponding machine data: Modify MD 30320: DISPLAY_IS_MODULO
Program Continuation:
Clear alarm with the RESET key. Restart part program
References
- Siemens Diagnostics Guide by Siemens