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APPX
Appendix 6 EMC and Low Voltage Directives
External wiring
■ 24VDC external power supply
For 24VDC I/O modules or intelligent function modules requiring an external power supply, connect an external power supply
of which insulation between the 24VDC circuit section and the hazardous voltage circuit section is reinforced.
■ External devices
For external devices connected to a programmable controller, use the one of which insulation between the interface circuit
section to the programmable controller and the hazardous voltage circuit section is reinforced (if the device internally has a
hazardous voltage circuit section).
■ Reinforced insulation
Reinforced insulation means an insulation having the following withstand voltage.
(Overvoltage category , source: IEC 664)
Rated voltage of hazardous voltage Surge withstand voltage (1.2/50s)
150VAC or less 2500V
300VAC or less 4000V
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