February 2012 24 – 393
24 Machine operating panel
24.1 Introduction
HEIDENHAIN machine operating panel MB 620 with axis axis-direction keys for up to six axes:
Normally, the MB is installed below or already integrated in the TNC keyboard (as with TE 635 Q).
On the MB 620 machine operating panel there are:
îš„ EMERGENCY STOP button
îš„ CONTROL ON button
îš„ NC START button
îš„ NC STOP button
îš„ Keys for spindle start and spindle stop
îš„ Axis direction keys for 6 axes
îš„ Various function keys
îš„ Two bore holes for additional keys or key switches (shipped blocked with a cover).
HSCI bus The MB 620 is an HSCI bus device.
Key and button
signals
The keys and buttons of the MB are transmitted to the control as PLC inputs via the HSCI bus.
Emergency stop
button
Potentiometers With a ribbon cable, the potentiometers of the TE 6xx are powered and evaluated by the MB 620
machine operating panel. The information is transferred to the control via the HSCI bus.
Handwheel Supply and evaluation of handwheels is effected via the MB 620. The information is transferred to
the control via the HSCI bus.
PLC outputs MB 620 features 8 PLC outputs (which serve, for example, to control the lamps of the buttons).
The MB 620 keys are easily snapped off and exchanged.
With the MB 620 without FS, the EMERGENCY STOP must be wired externally in the
EMERGENCY STOP chain.
HEIDENHAIN recommends checking the function of the EMERGENCY STOP button on the
(customized) machine operating panel in regular intervals.
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