Product Description:

The 7AI354.70 is an input module produced by B&R Automation for the System 2003 Controllers series. Within a control rack, it accepts low-level sensor voltages and converts them to integer data that the controller CPU can process, allowing closed-loop control or monitoring tasks without external signal conditioners. Its design targets differential voltage sources commonly found in industrial automation, so field wiring noise is rejected and the control program receives accurate numeric representations of each process variable. This makes the module suitable for applications that collect signals from transducers, reference sources, or other analog devices that must be read directly by the controller.

The module performs analog-to-digital conversion at a resolution of 12-bit + sign, giving 4096 discrete steps plus polarity for each measured value. Each channel accepts a bipolar range of ±10 V, and the high-impedance front end presents 20 MΩ to the field device so connected transducers are not unnecessarily loaded. The module provides 4 inputs, allowing multiple analog points to be measured at the same time. Differential topology is used on every channel pair to suppress common-mode interference that can be introduced by long cable runs, nearby drives, or other electrical noise sources.

Accuracy parameters are kept tight: both gain and linearity deviations are limited to 0.1% of final value at 25 °C, while offset is confined to ±2.5 mV so scaling errors remain small across the full input span. After conversion, the resulting words are output in the controller’s INT format, which allows direct use in application code and simplifies data handling inside the CPU. Internal electronics draw only 0.5 W, which helps reduce cabinet heat and eases power-bus loading. Protective features include tolerance to supply-voltage miswiring at the inputs and an enclosure classified as IP20, supporting installation in ventilated control panels where finger-safe protection is required.