Wiring Of Inputs - Mitsubishi Electric FX Series Training Manual

Wiring
2.7.2

Wiring of Inputs

Connecting sink or source devices
The base units of the FX family series can be used with sink or source switching devices. The
decision is made by the different connections of the "S/S" terminal.
FX base unit
FX base unit
All inputs of a base unit or an extension unit can be either used as sink or source inputs, but it is
not possible to mix sink and source inputs in one unit. Separate units in one PLC however can be
set as sink or source inputs types, since the base unit and input/output powered extension units
are individually set to sink or source input mode.
Examples for input types
AC powered base units
2 - 14
L
N
24V
0V
S/S
X
L
N
24V
0V
S/S
X
Sink
L
N
S/S
0V
24V
X000
X001
X002
X003
In the case of the sink input type, the S/S
terminal is connected to the 24V terminal of
the service power supply or, when a DC pow-
ered base unit is used, to the positive pole of
the power supply.
Sink input means that a contact wired to the
input (X) or a sensor with NPN open collector
transistor output connects the input of the
PLC with the negative pole of a power
supply.
In the case of the source input type, the S/S
terminal is connected to the 0V terminal of the
service power supply or, when a DC powered
base unit is used, to the negative pole of the
power supply.
Source input means that a contact wired to
the input (X) or a sensor with PNP open col-
lector transistor output connects the input of
the PLC with the positive pole of a power
supply.
Source
L
N
S/S
0V
24V
X000
X001
X002
X003
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