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10 Input Wiring Procedures
10.1 Before Starting Input Wiring
142
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
3. Instructions for using
• Mixed use of sink/source inputs
It is possible to set all input terminals (X) of the main unit to either sink input or source input mode.
However, a mixture of sink and source input terminals cannot be set within a single unit.
- It is possible to set sink or source input mode for main units and powered input/output extension units.
- The input mode of input/output extension blocks is determined based upon the selection of the sink or
source input mode of the main unit or powered extension unit (power source).
• Cautions when selecting a model
Sink/source input type and sink input type only unit models are both available. Select the proper type for
the application.
Differences from FX1N PLCs in input specifications (reference)
Sink input type only FX
1N PLCs (manuals in Japanese are supplied) and sink/source input type FX1N PLCs
(manuals in English are supplied) have different model names.
• For sink input type only FX
1N PLCs, the S/S terminal and the 24V terminal are connected internally, unlike
in FX
3G PLCs.
When replacing a sink input type only FX
1N PLC with a FX3G PLC, short-circuit the [S/S] and [24V]
terminals, and use the [0V] terminal of the FX
3G as the [COM] terminal of the FX1N for wiring.
• Sink/source input type FX
1N PLCs are configured in sink or source input mode using external wiring in the
same way as FX
3G PLCs.