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FX2NC Series Programmable Controllers Installation notes 3.
3-18
3.12 Termination of connector style I/O
The I/O connector should be the 20-pin type and should conform to MIL C 83503 of Military
Standard.
This type of connector is also used for FX
2C
series programmable controllers.
The output connectors of the main unit and the connector-type 16-point output extension
blocks are the 16-point common type (8-point common type for the FX
2NC
-16MT).
These output connectors have two COM1 to COM3 pins that are connected to each other
inside the programmable controller. To connect the line to an external unit, shortcircuit
these two pins at the external circuit so that the load of each pin can be reduced.