Omron NX-AD series User Manual page 94

4 Installation and Wiring
It is not necessary to connect the shield normally. However, if noise affects the Unit, ground the end
of the shield on the Input Unit side. In this case, do not connect the end of the shield anywhere on
output device.
You can use the NX-TBX01 Shield Connection Unit to ground more than one shield.
Ground of
100 Ω
or less
Connect the shield of the cable to the SHLD terminal. And ground the functional ground terminal to
100 Ω or less.
Precautions for Correct Use
To ensure this NX Unit is kept in the best operating condition, observe the following points
when wiring to avoid the effects of the noise.
• Use a shield wire (2 conductors, twisted wire) or a shield wire (3 conductors) as the input
connection line for each input. Use the shield without connecting to anything normally.
• Wire the input connection lines and power lines (e.g., AC power supply lines or power lines)
separately. Do not place such lines in the same duct.
• Insert a noise filter into the power supply input section if noise comes from power supply
lines when using the same power supply to power an electrical welder or an electric dis-
charge machine, or there is a high-frequency source nearby.
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Shield Connection Current Input Unit
Unit NX-AD4204
NX-TBX01
B1
A1 A1
Input1+ Input2+
SHLD SHLD
SHLD SHLD Input1− Input2−
SHLD SHLD
Input3+ Input4+
SHLD SHLD
Input3− Input4−
SHLD SHLD Input5+ Input6+
SHLD
SHLD Input5− Input6−
SHLD SHLD Input7+ Input8+
Input7− Input8−
A8 B8 A8
NX-series Analog I/O Units User's Manual for Analog Input Units and Analog Output Units (W522)
Shield
Output
device
B1
Input +
Input −
B8
Do not ground the
shield on the output
device.