Chapter 9 Installation and Wiring
(8) To prevent surge from lightning, use the lightning surge absorber as presented below.
(1) Isolate the grounding(E1) of lightning surge absorber from the grounding(E2) of the PLC.
(2) Select a lightning surge absorber
type so that the max. voltage may not the specified
allowable voltage of the absorber.
(9)
When noise may be intruded inside it, use an insulated shielding transformer or noise filter.
(10) Wiring of each input power should be twisted as short as possible and the wiring of shielding transformer or
noise filter should not be arranged via a duct.
E2
PLC
I/O device
E1
Surge absorber to prevent
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