Allen-Bradley 1756-IF4FXOF2F Analog I O Module

The Allen-Bradley 1756-IF4FXOF2F is a ControlLogix high-speed analog I/O module that provides four differential analog input channels and two high-speed analog output channels in a single 36‑pin module for fast, synchronized signal conditioning within a ControlLogix chassis. The inputs support multiple ranges—±10 V, 0–10 V, 0–5 V, and 0–20 mA—with overrange indication when exceeded; input impedance for voltage is >1 MΩ and 249 Ω for current, and the module uses a successive-approximation conversion method with an approximate 14-bit resolution across ±10.5 V (21 V total) and about 12–14 bits depending on the range. Open-circuit detection provides a positive full-scale reading within 1 s, and overvoltage protection is rated at 30 V DC (8 V AC/DC for current). Calibrated accuracy is 0.05% of range at 25 °C, with gain drift up to 25 ppm/°C for voltage and 35 ppm/°C for current, and a calibration interval of 12 months. Module scan time begins at 300 μs (minimum), supporting fast data capture, while the two outputs enable rapid current or voltage actuation to complement the four inputs in demanding control and monitoring applications.