The IF4 handles analog signals in voltage (±10 V, 0–10 V, 0–5 V) or current (0–20 mA, 4–20 mA), with ±0.2% full-scale accuracy (±0.4% at 0–5 V) across -25 to +60 °C. It delivers scan times under 0.4 ms and features module and I/O LEDs.