Sinumerik Alarm 16903 Channel %1 program control: action %2 not allowed in the current state
%1 = Channel number
%2 = Action number/action name
The relevant action cannot be processed now. This can occur, for instance, during read-in of machine data.
– Alarm display.
Wait until the procedure is terminated or abort with Reset and repeat the operation.
Clear alarm with the Delete key or NC START.
- Siemens Diagnostics Guide by Siemens