```
Traceback (most recent call last):
  File "/home/jauria/Proyectos/qtpyvcp/qtpyvcp/actions/machine_actions.py", line 697, in <lambda>
    STATUS.limit.onValueChanged(lambda: _override_limits_ok(widget))
  File "/home/jauria/Proyectos/qtpyvcp/qtpyvcp/actions/machine_actions.py", line 680, in _override_limits_ok
    aletter = 'XYZABCUVW'.index(anum)
```