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3.2 Power Supply Wiring
Connect the 24V DC power supply line of the PNK-ADP to the 24+ and 24- terminals of
the terminal block.
3.2.1 To connect to FX3U Series PLC
Caution regarding connection of the power supply line
• Ground the " " terminal to a class-D grounding power supply line (100Ω or less)
together with the ground terminal of the PLC main unit.
• For the timing of power-on/off when using an external power supply, see the
following manual of the PLC to be connected.
→ Refer to the FX3U Series User's Manual - Hardware Edition.
3.2.2 To connect to FX3UC Series PLC
24V DC
Class-D
grounding
Terminal
block
PNK-ADP FX3U Series
PLC
(Main unit)
+5V
24+ 24-
1. To use an external power
Class-D
grounding
Terminal
block
PNK-ADP FX3U Series
PLC
(Main unit)
+5V
24-
2. To use the 24V DC power of the PLC
24V 0V 24+
FX
3.3 Selection of resistance thermometer sensors
→ For the terminal layout, refer to Section 1.2
Precautions on resistance thermometer wiring
• When using a 2-wire temperature sensor type, short-circuit the [L-] terminal
and the [I-] terminal. For the lead wire use a 10Ω resistance or less per line.
• Separate the cable of the resistance thermometer sensors from the other
power cables or areas easily affected by inductive noise (of the commercial
power, etc.).
Example of resistance thermometer wiring
1MΩ
ch…
PNK-ADP
+5V
Shield wire
Terminal
block
3-wire
sensors
type
1MΩ
47kΩ 47kΩ
1MΩ
ch…
+5V
1MΩ
47kΩ 47kΩ
2-wire
sensors
type
L…-
I…-
L…+
L…-
I…-
L…+
*2
Resistance thermometer
wiring