July 2010 22 – 363
22.4 Checking the Keys
This includes the hard keys on the TE keypad unit and the soft keys on the BF flat-panel
display. The soft-keys rows of the screen are connected by ribbon cable with the keypad board.
Correct
operation?
Make sure that the key really functions in the selected operating mode. --> Consult the machine
operator or see user's manual!
Visual inspection First check the keypad visually!
Is the key heavily contaminated (grease, dust, oil, etc.)?
Are there any jammed chips?
The key may thus get stuck.
In such events carefully clean the keyboard. --> See “Corrective Action” on page 22 – 371.
Is the key or the area around it heavily worn out?
This is an indication that the service life of the tool has expired and that is does not make contact
any longer.
Does the control
receive the key
signal?
Observe the key code in PLC word W274 when pressing the keys:
8 Switch on the machine.
8 Press the EMERGENCY STOP key.
8 Call the table with the PLC words. --> See “The TABLE function” on page 11 – 119.
8 Place the cursor on word 274.
8 Press the key to be examined and check if the display changes to a key code or if the key
reacts accordingly!
See the chapter "Machine Operating Panel" how to check the machine operating panel keys
on the TE 535 Q.
The key code is secondary. Important is, whether or not the control detects the keystroke.
If a key does not produce a reaction of the control, one does not know, whether the
pushbutton itself or the keyboard PCB, the keyboard cable or the control is defective.
Further tests are required. --> See following descriptions!
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