Product Description:

The 7AT324.70-1 is an analog input module produced by B&R Automation for the System 2003 Controllers series. As a resistance-measurement device, it interfaces temperature and process sensors with the controller backplane. The screw-in mounting style secures the module in the I/O rack, while its IP20 housing protects the electronics against finger contact and settled dust. The unit converts precision resistance data into numeric values used for closed-loop control across industrial automation lines.

Each of the four input channels works on a 2-wire connection, so only the sensing element and return lead are required, reducing field wiring. A sigma-delta converter with 16-bit resolution digitizes the signal, giving 65,536 discrete steps over the programmed range. The module completes a full conversion in 60 ms per channel, and the multiplexer needs an additional sensor switch time of 190 ms, which sets the fastest scan rate when all points are read. With 4 channels available, thermal mapping or multivariable acquisition can be performed without additional cards. Measurement uncertainty is limited to ±0.1 % at 25 °C, supporting accurate energy or process balances.

The circuitry accepts platinum and silicon sensors directly. For platinum elements, the −200 to +850 °C span for PT100 or PT1000 probes is supported, while silicon types such as KTY84-130 operate across −40 to +300 °C and the related KTY10-6 range starts at −50 °C. Internally selectable shunts let the module evaluate resistances from 1 to 4 995 Ω or 1 to 2 497.5 Ω, accommodating both sensor families without external scaling. Despite this flexibility, the board draws only 0.1 W, minimizing controller thermal load. Supported sensors include KTY10-6, KTY84-130, PT100, and PT1000, so no transmitter is required when assembling a temperature-measurement chain.