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Welcome to this new tutorial for Mitsubishi 
FX PLC.

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Our topic is about wiring of input devices 
to the FX Series PLC.

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PLC input signals could come from pushbuttons, 
on-off switch,

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key switch, limit switch, level or float 
switch, flow switch,

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pressure switch, temperature switch, photoelectric 
sensor or proximity sensors.

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Inputs from 1 to 8 are either normally open 
or

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normally closed voltage free contacts.

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Photoelectric or proximity sensors are usually 
transistor output

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which can be either NPN or PNP type transistor.

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Mitsubishi FX PLC input (X) terminals are 
common

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to sink or source  input of 24V DC internal 
power,

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except for earlier models like FX1S, FX1N 
and

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FX2N that has japanese specification.

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What is sink and source input?

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Sink and source refers to the direction of 
current flow

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into or out of the plc input terminals.

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Sink input is negative common.

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Sink input means a DC input signal with current 
flow

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from the input (X) terminal.

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From input going to the negative power supply 
(0V).

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When a sensor with a transistor output is 
connected,

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either proximity sensor or photoelectric 
sensor,

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NPN open collector transistor output can 
be used.

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It means if the PLC is connected as sink 
input

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NPN output sensors should be used.

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