Checking The Keys - HEIDENHAIN iTNC 530 Service Manual

22.4 Checking the Keys

This includes the keys on the TE keypad unit and the keys (soft keys) on the BF flat-panel
display. The soft keys of the screen are connected by ribbon cable with the keypad board.
Correct operation? 
Visual inspection 
The key may thus get caught.
In such a case, the keypad must be cleaned carefully.
Does the control To be sure you can observe the key code in PLC word W274 when
receive the the keys are pressed:
key signal?
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Text file As an alternative to test whether the control receives the key signals, you can create a text file,
KEYTEST.A e.g. KEYTEST.A.
The keys pressed on the ASCII field (blue keys) are displayed directly. Other keys mostly
generate the message "Key non-functional" or a corresponding reaction, e.g., change to a
machine operating mode.
22 – 360
Make sure that the key in the selected operating mode really functions.
--> Ask the machine operator or look it up in the User's Manual!
First check the keypad visually!
Is the key strongly contaminated (grease, dust, oil, etc.)?
Are there jammed chips?
DANGER
When liquid cleaning agents have be used, the electrical units must dry completely before
they are operated again.
Press EMERGENCY STOP.
Reboot the control.
Do not acknowledge the "Power interrupted" message.
Call the PLC table for the words (see "The TABLE Function" on page 10 – 76).
Press the key to be examined and check if the display changes to the valid key code and/or
the key reacts correspondingly. --> See note.
Note
When examining these keys, please check if the following reactions are generated:
END --> To leave the PLC table.
PG UP --> The cursor jumps one page up.
PG DN --> The cursor jumps one page down.
GOTO --> A target must be entered at the top of the screen
(press NO ENT to exit!).
END BLOCK --> To leave the PLC table.
MACHINE OPERATING MODES --> The corresponding machine operating mode is called.
HEIDENHAIN Service Manual iTNC 530