Siemens Industrial PC Simatic Panel PC 677B - Manual (Page 23)

Connecting
4.4 Connecting the Equipotential Bonding Circuit
SIMATIC Panel PC 677B
Operating Instructions (Compact), 06/2008, A5E02217246-01
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4.4 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 4-1 Equipotential Bonding
Connecting the Equipotential Bonding Circuit
You require a TORX T20 screwdriver to connect the equipotential bonding conductor.
Steps for connecting the equipotential bonding
(1) Connect the equipotential bonding connection (M4 thread) (1)
on the device (large surface, large-area contact) with the
central grounding point of the control cabinet.
The minimum permissible cross-section is 5 mm 2 .