July 2010 24 – 403
Checking the keys The function of most handwheel keys can be checked with the respective PLC marker. Use the
PLC diagnosis functions TABLE or LOGIC DIAGRAM:
8 Switch on the machine.
8 Press the EMERGENCY STOP key.
8 Activate the HR 420 (press the handwheel symbol on the HR 420). -->
The window Handwheel active appears on the screen.
8 Call the table with the PLC markers or the logic diagram.
--> See “Diagnosis Tools in the PLC Mode” on page 11 – 119.
8 Press the handwheel keys.
8 Check whether the corresponding markers are set (following table).
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