The Siemens 6ES7431-1KF20-0AB0 is an 8-channel analog input module. It accepts voltage, current, and resistance inputs with a basic conversion time of 52 µs and typical power loss of 4.9 W.
Input flexibility and isolation
Input ranges include ±10 V, ±1 V, 1–5 V, 4–20 mA, ±20 mA, and 0–600 Ω. Input resistance varies: 10 MΩ on ±1 V and 1–5 V ranges, 50 kΩ on 4–20 mA, 50 Ω on ±20 mA — relevant when calculating loop loading for passive sensors. Isolation is internal/external with tested breakdown at 2 120 V DC between bus and analog section and 500 V DC between analog part and L+/M. The module draws up to 1 000 mA from the 5 V DC backplane bus. The 24 V DC supply is only required if powering 2-wire transmitters. Shielded cable runs up to 200 m are supported.
Lifecycle stage is listed as mature. This is an established part, not flagged for discontinuation.