7AM351.70 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 7AM351.70 is part of the System 2003 Controllers series and provides 16-bit ADC and DAC resolution. It features one differential input channel with a ±10 V range, 20 MΩ input impedance, channel-to-PLC isolation, and IP20 ingress protection. The module offers a power consumption of 1.4 W and includes one output channel also rated at ±10 V.
Internal Product Review
The 7AM351.70 is a System 2003 analog controller module suited for precision industrial signal processing. Matched 16-bit ADC and 16-bit DAC resolution give this unit a refined level of conversion performance. Channel-to-PLC isolation and ±0.02% input accuracy make this module especially attractive for high-integrity control loops.
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Product Description:
B&R Automation's 7AM351.70 module belongs to the System 2003 Controllers series. It is an analog I/O slice that pairs a single high-resolution input with a single output, allowing a controller rack to acquire and generate ±10 V signals used for pressure, position, or temperature loops. By converting field-level voltages into digital data and reproducing commanded values on the output side, the unit links sensors and actuators to the PLC backplane with minimal panel depth and supports distributed automation tasks in compact control cabinets.
On the input side, the module offers 1 input channel in a differential configuration. Incoming signals encounter 20 MΩ input impedance, so loading on the field device remains negligible. An integrated sigma-delta converter provides 16-bit ADC resolution, translating the analog span into fine measurement steps for closed-loop control. The input path handles a ±10 V input range and maintains accuracy of ±0.02% plus 0.9 µV at 24 °C. There is no channel-to-channel isolation, but electrical separation between the input circuitry and the PLC backplane helps reduce ground-loop problems because the channel and the PLC do not share the same reference directly.
Signal generation is handled by 16-bit DAC resolution, enabling deterministic analog control with output granularity that matches the measurement path. The board provides 1 output channel, and its driver can source or sink the required voltage span for actuators or external setpoint inputs. Output accuracy is held within ±0.02 % plus 1.2 µV output accuracy at 24 °C, supporting precise command reproduction in control loops. Overall demand on the backplane is limited to 1.4 W power consumption, which helps reduce heat buildup in densely populated racks. Installation inside control cabinets is suitable because the housing carries an IP20 rating, so wiring is protected against finger contact while ventilation openings remain available for convection cooling.
