Mitsubishi MELSEC - Wiring; The Precautions on the Wiring

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10.3 Wiring
10.3.1 The precautions on the wiring
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LOADING AND INSTALLATION
10.3 Wiring
10.3.1 The precautions on the wiring
DANGER
Be sure to shut off all phases of the external supply power used by the
system before wiring.
Not completely turning off all power could result in electric shock or dam-
age to the product.
When energizing or operating the module after installation or wiring, be
sure to close the attached terminal cover.
Not doing so may result in electric shock.