Omron NX701-1700 User Manual page 134

4 Installation and Wiring
a) Connecting devices and noise sources to separate earth electrodes
This is an earthing method to separately ground an earth electrode of the device that is con-
nected with a communications cable or other devices and an earth electrode of a high-power
device that could be a noise source, such as a motor or inverter.
Each earth electrode must be ground to 100 Ω or less.
Connect the ground lines of the device that is connected with a communications cable and other
devices as a bundle to a single earth electrode. Be sure that the earth electrode is separated by
a minimum of 10 m from any other earth electrode of a device that could be a noise source.
Control panel
b) Connecting devices and noise sources to a common earth electrode
This is an earthing method to connect the device that is connected with a communications cable,
other devices, and a device that could be a noise source, to a common earth electrode.
This earthing method is not recommended because the device that could be a noise source may
interfere electromagnetically with other devices.
Control panel
 Daisy Chain
This is an earthing method to connect the device that is connected with a communications cable,
other devices, and a device that could be a noise source using a daisy-chain topology to a common
earth electrode.
This earthing method is not recommended because the device that could be a noise source may
interfere electromagnetically with other devices.
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Other device NX-series CPU Units
Hub
Other device NX-series CPU Units
Hub
A device that could be
NX-AUX01 a noise source
PLC
10 m min.
A device that could be
NX-AUX01 a noise source
PLC
NX-series CPU Unit Hardware User's Manual (W535)