What the I/O configuration means for your panel
The FX3U-80MR-ES/A carries 40 digital inputs and 40 relay outputs, giving you 80 total I/O points in a single CPU chassis — enough for a medium-sized machine cell or a conveyor zone with local control. Relay outputs (rated for resistive loads up to 2 A per point typical for this class) handle inductive loads like contactors and small solenoids without external snubbers, but the mechanical life limits high-frequency switching — budget for solid-state output modules if your application cycles faster than once per second.
Panel fit and power budget
The 285x90x86 mm footprint fits a standard 90 mm wide DIN-rail enclosure — the depth leaves clearance for the backplane wiring ducts and the front-access terminal blocks. Power consumption is listed at 100 W total, with a separate 50 W figure likely covering the CPU and I/O bus — size your 24 VDC supply to handle the full 100 W draw plus any field devices powered from the same rail.
Sourcing and lifecycle reality
Lifecycle status is marked mature — the FX3U series is a well-established Mitsubishi platform still widely specified in existing installations, though not actively promoted for new greenfield designs.