Mitsubishi GX-Developer V8.91 is a PLC programming program that can be programmed for FX series such as FX3U, FX3G. It is used with the SC-09 programming cable. FX3G programming uses the same cable that is used to program FX3U. The FX3G and G3 programming cables have the same connector for the FX3U and FX3G, but they have different color schemes for the programming cables. The FX3G program cable has an orange connector for the FX3G. The FX3G program cable has a green connector for the FX3G and a blue connector for the FX3U.
The FX3U is a PLC programming device that can be used to program the FX3G/FX3U. https://www.weactgreen.com/upload/files/2022/06/AM6i6D3qdAr7WbTC3cWl_07_cad299d0fe5cd97a711cb27e4d90bad3_file.pdf