For the FX3U series, up to eight FX3U-1PGs can be connected. For the FX3UC series, up to six FX3U-1PGs can be connected.
* To connect the FX3U-1PG to the FX3UC series main unit, either of the FX3UC-1PS-5V extension power supply unit or the FX2NC-CNV-IF connector conversion adapter is required.