Siemens 6ES7531-7NF00-0AB0 SIMATIC S7-1500 AI 8xU/I HF 24-Bit Analog Input Module

The Siemens 6ES7531-7NF00-0AB0 SIMATIC S7-1500 AI 8xU/I HF module reads 8 analog channels configurable for voltage or current, at up to 24-bit resolution with plus/minus 0.1% operational accuracy. It supports measuring-range adjustment and calibration in RUN, draws 55 mA at 19.2 V supply, and dissipates 1.9 W typical, with 16 byte input address space.

Technical Specifications

Selection Notes

The AI 8xU/I HF combines voltage and current inputs on the same 8 channels and reaches up to 24-bit resolution in Fast mode when the project uses scaled REAL format, dropping to 16-bit INTEGER in S7 format — decide the data format before relying on the extra resolution. Its 60 V DC / 30 V AC common-mode voltage rating and 2 000 V DC isolation test between channels, backplane bus, and supply voltage L+ exceed a standard-accuracy analog module, which is the reason to specify the HF variant on installations with mixed ground potentials or tighter channel-to-channel isolation needs. Front connectors, screw-in or push-in, are not included and must be ordered separately.

Applications

Fits S7-1500 process I/O needing mixed voltage and current instrumentation on one module: 4-20 mA transmitters, plus/minus 10 V position feedback, and installations where channel isolation matters more than on a standard-accuracy analog module.