Mitsubishi FX2N PLC input circuit wiring diagram and method

Mitsubishi FX2N Wiring

2026 Industrial Intelligence Report

FX2N input wiring—sink vs source. Here's from field experience.

Sink vs Source

Sink Input

Connection: +24V to input

COM: Negative

Flow: Current into PLC

Source Input

Connection: Input to COM

COM: Positive

Flow: Current out of PLC

Wiring Example

Push Button (NO)
Connect to input point, COM to ground
Sensor (PNP)
Brown wire to +24V, blue to input
Sensor (NPN)
Blue to input, black to COM

FX2N supports both sink and source on same module—16 points, 2 groups of 8.

— Senior Controls Engineer

Connection Types

Type Wiring>
Sink +24V to input, COM to 0V
Source Input to COM, +24V to device
Pro-Tip: Match sensor type to wiring—PNP needs source, NPN needs sink.

Check sensor specs before wiring.

FAQ

+16 inputs?
Yes—16 points, 2 groups of 8. Both sink and source supported.
+PNP vs NPN?
PNP = source wiring (high side switch). NPN = sink wiring (low side switch).
+Resistor needed?
No—FX2N has internal current limiting. External not needed.

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