Controller specification and integration constraints
FX3U-80MT/ES-A PLC CPU with 40 digital inputs (24 VDC sink/source) and 40 transistor sourcing outputs. Main supply is 100-240 VAC; no separate 24 V PSU needed for the I/O bus, though external load power still requires a dedicated 24 VDC source. Dimensions of 285 × 90 × 86 mm (W × H × D) dictate panel cut-out and rail spacing; verify clearance for cable ducts and heat dissipation around the base unit.
Comparison with FX2N-48ER-DS — not a drop-in replacement
Output type differs — transistor (source) on the FX3U versus relay on the FX2N — so load circuits designed for relay dry contacts are incompatible without interface modules. The FX3U-80MT/ES-A's 285 mm width exceeds the FX2N's probable envelope; existing DIN rail assemblies may need re-spacing.