Product Description:

The B & R Automation 3AM374.6 is an analog I/O module for the System 2005 Controllers series. It occupies one slot on the controller backplane and supplies four differential analog inputs alongside four analog outputs, so a CPU can read sensor signals and drive actuators from the same housing. By combining inputs and outputs on one board, the unit reduces wiring inside distributed control panels and simplifies expansion of existing System 2005 installations. This arrangement is useful in compact machines that need to monitor transmitters and issue analog control signals without adding separate input and output cards.

The analog input section attains a basic accuracy of ±0.1% at 25 °C, allowing the controller to treat measured deviations as real process changes rather than conversion error. Sensors connected to the inputs face a load of only 50 Ω, so most loop-powered transmitters maintain their calibrated range. A front-end impedance of 2 MΩ limits current draw when high-resistance probes are used, and each conversion is performed with 12-bit resolution for 4096 quantization steps across supported voltage and current ranges. The electronics are housed in an enclosure rated IP20, and the channels are galvanically separated from the controller bus, which provides isolation without external barriers. Differential measurement also helps the module interpret low-level signals more reliably when sensor wiring runs through electrically noisy cabinets.

The output side mirrors the four-channel structure and sends values in INT format when commanded by the CPU. Current signals leave the card with an accuracy of ±0.15% at 25 °C, while voltage signals hold to ±0.3% at 25 °C, enabling consistent actuation of proportional valves or analog speed references. Overall consumption reaches 6.5 W when both the 24 V DC and 5 V DC rails are active, so rack power budgets must reserve that amount for continuous service. Keeping the acquired and generated data on one module also helps maintain straightforward scaling between measured values and output commands during closed-loop control tasks.