Siemens 6ES7531-7KF00-0AB0 SIMATIC S7-1500 AI 8xU/I/RTD/TC ST 16-Bit PLC I/O Module

The Siemens 6ES7531-7KF00-0AB0 is a SIMATIC S7-1500 AI 8xU/I/RTD/TC ST analog input module providing 8 universal channels at 16-bit resolution, accepting voltage, current, RTD and thermocouple signals on the same module. Supply is 24V DC (19.2-28.8V) and the module draws 255mA max at 19.2V. Reparameterization and calibration are both possible while the CPU is in RUN.

Technical Specifications

Selection Notes

Because the AI 8xU/I/RTD/TC ST reads current, voltage, RTD and thermocouple signals on one module, it avoids a separate RTD/TC purchase when a station mixes standard 4-20mA transmitters with temperature channels on the same rack. The 4 dedicated RTD channels and 8 thermocouple channels cover most furnace, bearing or ambient temperature monitoring needs without a second card. CiR support for reparameterization and calibration in RUN lets a range be changed on a live line, which matters when a channel needs to switch from current to RTD input without stopping the CPU.

Applications

Suited to mixed analog and temperature measurement on continuous process or machine lines built on S7-1500, where RTD or thermocouple channels for thermal monitoring sit on the same module as standard current/voltage transmitter inputs.