Product Description:

The 7AT352.70 is a temperature acquisition module produced by B&R Automation for its System 2003 Controllers series. Designed for connecting platinum resistance sensors directly to the PLC backplane, the card digitizes PT100 feedback so process temperatures can be monitored and controlled within an automation cell. By mounting beside CPU and I/O modules, it extends the controller with high-precision RTD measurement capability required in batch processing, packaging, and climate management stations.

Two independent input channels accept three-wire resistance signals. The converter works with a 16-bit delta-sigma ADC, allowing a step size of 0.1 °C over a large range and, on a narrow span, increments down to 0.01 °C. At mains-synchronized sampling, the module completes one conversion in 20 ms when the surrounding network is 50 Hz and 16.67 ms at 60 Hz, so transient thermal changes are captured without aliasing. Device accuracy is specified as ±(0.17 + 0.0005 × TF) °C, which combines an offset term with a temperature-dependent component to bound measurement error across the sensor range. Digitized values are placed on the System 2003 backplane in INT format, giving the PLC direct access to scaled temperature words for arithmetic or alarm comparison.

The card draws only 0.4 W, easing heat budgeting in dense racks. Because there is no channel-to-channel or channel-to-PLC isolation, the field wiring must share a common reference, yet supply-voltage protection on each input prevents damage if a sensor lead is mistakenly shorted to 24 V. Front wiring is handled through a plug-in terminal block with 12 pins, simplifying service replacement. The housing has an IP20 rating, suitable for installation inside a closed panel. The module is calibrated for PT100 elements, aligning its resistance tables with the most common industrial RTD standard.