Connecting
5.4 Connecting the Equipotential Bonding Circuit
SIMATIC HMI IPC677C
50 Operating Instructions, 04/2013, A5E02722710-04
Steps for connecting the device to the 24 V DC power supply
4 Fasten the cable with the supplied power plug
latch, if necessary.
Note
Reverse-polarity protection
The DC power supply (24V) has a mechanism to protect against reverse polarity. In the
event the 24 V DC lines are reversed (24 V DC nominal (-15% / +20%) and connected to
ground, the device will not sustain any damage. The device will simply fail to turn on. After
the power supply has been connected correctly, the device will again be ready to operate.
5.4 Connecting the Equipotential Bonding Circuit
A low-resistance ground connection ensures that interference signals generated by external
power supply cables, signal cables or cables to the I/O modules are safely discharged to
ground.
The equipotential bonding connection of the device is located underneath the device and is
identified by the following symbol:
Figure 5-1 Equipotential Bonding
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