Mitsubishi Melsec-Q Series User Manual page 214

9.2.5 Grounding
There are the following two different ground terminals.
Use either ground terminal in an grounding status.
Protective grounding
Functional grounding
9.2.6 External wiring
(1) Module power supply and external power supply
For the remote module which requires 24VDC as module power supply, the 5/12/24/48VDC I/O module, and the
intelligent function module (special function module) which requires the external power supply, use the 5/12/24/
48VDC circuit which is doubly insulated from the hazardous voltage circuit or use the power supply whose
insulation is reinforced.
(2) External devices
When a device with a hazardous voltage circuit is externally connected to the programmable controller, use a
model whose circuit section of the interface to the programmable controller is intensively insulated from the
hazardous voltage circuit.
(3) Intensive insulation
The intensive insulation covers the withstand voltages shown in Table9.7.
Rated voltage of hazardous voltage area
9 - 18
: Maintains the safety of the programmable controller and improves the noise resistance.
: Improves the noise resistance.
Table9.7 Intensive Insulation Withstand Voltage (Installation Category II, source : IEC 664)
150VAC or below
300VAC or below
Surge withstand voltage
(1.2/50 s)
2500V
4000V