Sinumerik Alarm 10721 Channel %1 block %3 axis %2 software limit switch %4
%1 = Channel number
%2 = Axis name, spindle number
%3 = Block number, label
%4 = String ( + or – )
For the axis, the planned motion violates the software limit switch. The alarm is activated during the preparation of approach or rest blocks at REPOS.
– Local alarm reaction.
– Interface signals are set.
– Alarm display.
Check in the NC program and current positions. Check the axis-specific interface signals “2nd software limit switch plus/minus” (DB31-61, DBX 12.2 or 12.3) to see whether the 2nd software limit switch is selected. Check currently active zero offset via the current frame. Check the machine data for the software limit switch (36100 POS_LIMIT_MINUS / 36120 POS_LIMIT_MINUS2 or 36110 POS_LIMIT_PLUS / 36130 POS_LIMIT_PLUS2). Interrupt the NC program via NC reset.
Clear alarm with the RESET key. Restart part program
- Siemens Diagnostics Guide by Siemens