Siemens 6ES7431-7QH00-0AB0 SIMATIC S7-400 SM 431 16AI 16-Bit U/I/R/TC/RTD Input Module

The Siemens 6ES7431-7QH00-0AB0 is a SIMATIC S7-400 SM 431 analog input module with 16 isolated channels at up to 16-bit resolution. Each channel is individually parameterizable for voltage, current, resistance, thermocouple, or resistance-thermometer (Pt100/Pt1000/Ni100/Ni1000) measurement, covering five sensor types on a single module, with a parameterizable diagnostic alarm reporting out-of-range readings back to the CPU.

Technical Specifications

Selection Notes

Choose this SM 431 variant when a single module must cover more sensor types than a standard analog input card, since it accepts voltage, current, resistance, thermocouple, and resistance-thermometer signals on the same 16 channels rather than a fixed subset. The 16-channel density also halves the module count versus 8-channel SM 431 variants in installations mixing several signal types across one rack, at the cost of losing one channel's worth of terminals per measurement type change during commissioning.

Applications

The five supported sensor types on 16 channels suit process racks that combine RTD temperature loops, thermocouple points, and standard 4-20 mA transmitters on one S7-400 slot, common in batch and utility skids. Per-channel parameterization lets each input be reconfigured for a different sensor type without rewiring.