They can be used together.
* 14/24-point type FX3G series main unit
・ An expansion board can be connected to BD1 (1st position) and a display module can be connected to BD2 (2nd position).
* 40/60-point type FX3G series main unit
When one expansion board is used, the expansion board is connected to BD1and a display module can be connected to BD2.
・ When two expansion boards are used, a display module can be connected to BD2 (2nd position).