The Mitsubishi FX3G-14MT/ESS is a MELSEC-F series main unit packing 14 I/O — 8 digital inputs and 6 transistor source outputs — powered by 100-240 VAC. It comes with USB and RS-422 ports for programming and comms, and runs off a 32K step EEPROM that doesn't need a battery backup.
The 32K step EEPROM means this PLC can hold medium-size programs without a backup battery — handy for equipment that sits powered off for long stretches. Cycle time is 210 ns for basic LD instructions and 500 ns for MOV, so it's fast enough for most machine control loops. Expandable to 128 local I/O points and 256 total including remote. Transistor source outputs handle inductive loads. Ambient rating is 0 to 55 °C, IP10 means enclosure mounting only.
How it sits against the FX3S-20MT/ES
The FX3S-20MT/ES is a fixed-I/O unit: 20 points, not expandable, 16K step memory.