5 Wiring
5.1 Power Supply Wiring
36
FX3U-16CCL-M User's Manual
5.1 Power Supply Wiring
5.1.1 Power supply wiring
Power-on/off timing
The FX
3U-16CCL-M power supply should be turned ON simultaneously with or before the power supply of the
PLC main unit. Before turning the power OFF, ensure the safety of the system and then simultaneously turn
the main unit, FX
3U-16CCL-M, and other extension equipment (the special extension equipment is included)
OFF.
For details, refer to the respective PLC manual.
→ Refer to the FX
3G Hardware Edition.
→ Refer to the FX
3U Hardware Edition.
→ Refer to the FX
3UC Hardware Edition.
5.1.2 Grounding
Ground the cables as follows
• The grounding resistance should be 100 or less.
• Independent grounding should be established whenever possible.
Independent grounding should be performed for best results.
When independent grounding is not configured, perform "shared grounding" as shown in the following
figure.
For details, refer to the respective PLC manual.
→ Refer to the FX
3G Hardware Edition.
→ Refer to the FX
3U Hardware Edition.
→ Refer to the FX
3UC Hardware Edition.
• The grounding point should be close to the FX
3U-16CCL-M, and all grounding wires should be as short as
possible.
Grounding
(Ground resistance:
100 or less)
FX
3G/FX3U PLC
[main unit]
FX3U-16CCL-M
Grounding
(Ground resistance:
100 or less)
Stabilized
power supply
24 V DC
24-24+
FX3UC PLC
[Main unit]
FX3U-16CCL-M
Stabilized
power supply
24 V DC
24-24+
FX2NC-CNV-IF
or
FX3UC-1PS-5V
Grounding
(Ground resistance:
100
or less)
Grounding
(Ground resistance:
100
or less)
FX3U-
16CCL-M
Other
equipment
Shared grounding
Good condition
Shared grounding
Not allowed
Independent grounding
Best condition
FX3U-
16CCL-M
Other
equipment
FX3U-
16CCL-M
Other
equipment
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