Note: Power supply of the FP-X expansion units
Be sure to supply power to the FP-X expansion units and the control unit from the same power supply,
and turn the power on and off simultaneously for both.
To avoid the influence of noises
Use the power supply causing less noise. The inherent noise resistance is sufficient for the noise
superimposed on the power wires, however, the noise can be attenuated further by using the isolation
transformer.
Also, twist the power supply cables to minimize adverse effects from noise.
Grounding
Ground the instrument to increase noise suppression.
Exclusive grounding
• For grounding purposes, use wiring with a minimum of 2 mm
2
. The grounding connection should have
a resistance of less than 100Ω.
• The point of grounding should be as close to the PLC unit as possible. The ground wire should be as
short as possible.
• If two devices share a single ground point, it may produce an adverse effect. Always use an exclusive
ground for each device.
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