Siemens S120 Manual page 342

Supplementary system components and encoder system integration
8.1 Sensor Modules
Note
Diminished level of interference immunity due to equalizing currents via the electronics
ground
Ensure that there is no electrical connection between the encoder system housing and the
signal cables, or the encoder system electronics. If this is not carefully observed, the system
may not be able to reach the required interference immunity level. (There is then a danger of
equalization currents flowing through the electronics ground.)
Note
Function equipotential bonding for distributed DRIVE-CLiQ nodes
Integrate all of the components that are connected via DRIVE-CLiQ into the function
equipotential bonding concept. The connection should be preferably established by mounting
on metallic bare machine and plant components that are connected with one another using
an equipotential bonding conductor.
Alternatively, you can establish equipotential bonding using a conductor (min. 6 mm²), which
as far as possible, is routed in parallel to the DRIVE-CLiQ cable. This involves all distributed
DRIVE-CLiQ nodes, for example SMCx.
Note
Functional faults caused by dirty DRIVE-CLiQ interfaces
Malfunctions can occur in the system through the use of polluted DRIVE-CLiQ interfaces.
• Close any unused DRIVE-CLiQ interfaces with the supplied cover plates.
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Manual, (GH6), 04/2014, 6SL3097-4AL00-0BP4
AC Drive