HEIDENHAIN CNC Pilot 4290 V7.1 - Manual (Page 54)

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Additional information on error messages
When an error message occurs, press the info key, or place the cursor
on the error message in the error display and then press the info key,
to get further information on the respective error.
Meaning of the soft keys:
U Information on the next error message.
U Information on the previous error message.
U Switches to the general info system
U Switches to the general info system
PLC display
The PLC window is used for PLC messages and the PLC diagnosis.
Your machine manual provides more detailed information on the PLC
window.
Activating the PLC display:
U Opens the “error display”
U Switches to the PLC window
U Close PLC window
U Return to error display
The PLC window is shown as alternative to the error window.