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 gounding 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.
5.3.2 Service Power Supply for Input (For L30, L40 and L60 types)
Service power supply for input
- Use it for input and the expansion FP0 adapter. (Use an external power supply for the FP0/FP0R
expansion unit.)
- When it is used for another device, confirm the consumption current of the device side before it is
connected. If excess current is being supplied for a long time, the power supply may be damaged.
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