VX121P/151P/171P(-QM57)
User’s manual rev.0.0 (Preliminary)
MU-C656.xxxxxxxxxx r.0.0-EN
29 of 68
The Panel PC must be connected to earth by means of a conductor of suitable
cross section connecting the Equipotential Bonding screw on the chassis to the
quiet earth point.
The 0V (GND) of the internal supply ATX is connected to the metal frame and
then to the Equipotential Bonding screw for earthing.
When the Panel PC is connected, through a not insulated I/O port, (e.g. serial or
other port) to another equipment also with GND connected to the earth both of
them must be connected to the same earth point to avoid circulation of current
because of the difference of potential between earth points.
