What it is and where it fits
The FX3U-4AD: Power is drawn from two rails: 110 mA from the PLC internal DC 5 V supply, plus 90 mA from an external DC 24 V ±10% supply. Occupies 8 I/O points on the PLC (configurable as input or output).
Installation constraints
Grounding must be Class D with ground resistance 100 Ω or less; dedicated or common grounding is specified. No channel-to-channel isolation exists – analog inputs share a common reference – but photo-coupler isolation separates the analog section from the PLC core. Withstand voltage between all terminals and ground is 500 VAC for 1 minute. Operating ambient temperature is 0 to 55 °C; storage -25 to 75 °C. Relative humidity 5 to 95% non-condensing. The module must not be used at altitudes above 2000 m.