Siemens 6ES7531-7QD00-0AB0 SIMATIC S7-1500 Analog Input AI 4xU/I/RTD/TC ST 16-bit PLC I/O Module

The Siemens 6ES7531-7QD00-0AB0 is a SIMATIC S7-1500 universal analog input module with 4 channels that each accept voltage, current, RTD, or thermocouple signals at 16-bit resolution, with 2 of the 4 channels usable for resistance thermometers. It ships with a push-in front connector, infeed element, and shield bracket/terminal included, and supports thermocouple types B, E, J, K, N, R, S, and T.

Technical Specifications

Selection Notes

The ST (standard) module trades the HS module's fixed 62.5 microsecond cycle for multi-signal-type flexibility - voltage, current, RTD, and thermocouple on the same 4 channels - with parameterizable integration times from 2.5 to 100 ms that slow the measurement in exchange for the accuracy needed on RTD and thermocouple readings; pick the AI 8xU/I HS module instead when only voltage/current inputs are needed and fast oversampled sampling matters more than signal-type flexibility.

Applications

Temperature and process-value acquisition where a single module must mix RTD, thermocouple, and standard voltage/current signals - for example furnace or oven zone monitoring, or general process instrumentation on S7-1500.