February 2012 24 – 397
24.5 Checking the keys
Correct operation? Ensure that the key really has to function in the selected operating mode.
--> Consult the machine operator or the User's Manual!
Visual inspection Start with a visual inspection:
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 machine operating panel.
--> See ”Corrective action” on page 24 – 400.
Is the key or the area around it heavily worn?
This is an indication that the service life of the key has expired and that it does not make contact
any longer.
Description
of the buttons
The keys of the MB 620 are named as follows:
These names (e.g. S31) also appear in the HSCI bus diagnosis.
Does the control
receive the key
signal?
The keys and buttons of the MB 620 are assigned to PLC inputs defined by the OEM.
Connectors and pin layouts on MB 620 --> See ”Machine operating panel” on page 28 – 500.
The function of the MB keys can be checked with the HSCI bus diagnosis:
8 Switch on the machine.
8 Press the EMERGENCY STOP button.
8 Call the HSCI bus diagnosis. --> See ”Bus diagnosis” on page 12 – 147.
8 Open the path MB 620 / Digital Input and place the cursor on the key to be inspected.
8 Press the key. --> The input must change to 1.
Exception: NC STOP --> Changes to 0 when actuated (failsafe!)
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