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5 Installation and Wiring
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
5-5 Control Panel Installation
5
5-5-6 Grounding
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.
General Precautions
• To prevent electrical shock, do not connect devices to ground poles (or steel frames) with
non-equalized potential to which multiple devices are connected.
• Use a ground pole as close to the Controller as possible and keep the ground line as short as pos-
sible.
• If the same ground is used for both the signal lines and the enclosure, isolate the channel base (a
grounded metal plate inside a control panel) with an insulating material.
Refer to Isolating the CPU Rack from the Control Panel on page 5-44 for how to isolate the CPU
Rack of an NX1P2 CPU Unit.
• If high-frequency equipment is present, then ground not only the high-frequency equipment but
also the panel itself in which the Controller is housed.
Precautions for Grounding
Hub
NX-AUX01
A device that could be
a noise source
NX-series NX1P2 CPU UnitNX-series CPU Unit
Control Panel Other device
Example: Insulating and Grounding an Enclosure
Independent ground
Insulating material
Channel base
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