7AT351.7 B & R Automation
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The B & R Automation 7AT351.7 is part of the System 2003 Controllers series and uses a PT100 sensor type following the IEC/EN 60751 standard. This screw-in module features 1 input, automatic temperature conversion, and supports 3-wire wiring. It consumes 0.3 W of power and has a measurement current of 2 mA.
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Product Description:
The 7AT351.7 is a temperature measurement module produced by B&R Automation for the System 2003 Controllers series. Installed on the controller backplane, the module provides a dedicated channel for resistance-based temperature sensing and feeds the result to the CPU for closed-loop regulation or data logging functions within an automated line. By integrating a discrete sensor interface inside the control rack, machine builders can avoid external transmitters and keep signal conditioning close to the PLC. This arrangement keeps the sensor path short inside the cabinet after field wiring reaches the rack.
This screw-in module offers 1 input that sources a constant 2 mA excitation current through the connected element. Because the measurement principle is resistance, the module directly interprets the variation in ohmic value of a PT100 sensor to derive temperature. Accuracy is supported by conformity with IEC/EN 60751, so the conversion coefficients match the standardized alpha value of platinum probes. With automatic temperature conversion enabled, the controller receives scaled engineering units without additional code. Mounting is handled by the screw fastener integrated into the housing.
Electrical loading on the I/O rack remains low because the board draws only 0.3 W during operation. When connected with a 3-lead cable, the internal circuitry compensates for line resistance, and the required topology is a 3-wire arrangement. For narrow control ranges, the small-span path of the converter provides 0.01 °C resolution, while over the full operating span the step width is 0.1 °C. The input channel is not isolated from the processor common, so shielding and proper grounding must be used to prevent ground loops. The CPU receives temperature data directly from the module rather than from a separate external conversion stage.
Frequently Asked Questions about 7AT351.7:
Q: How many input channels are available on the 7AT351.7 module?
A: The 7AT351.7 is equipped with a single input channel for signal measurement.
Q: Which sensor types does the 7AT351.7 support for temperature measurement?
A: This module is compatible with PT100 sensors as per IEC/EN 60751 standards.
Q: What is the minimum temperature resolution available on the 7AT351.7?
A: The 7AT351.7 provides a fine small-range resolution of 0.01 °C.
Q: What type of mounting does the 7AT351.7 module utilize?
A: Mounting is achieved using a screw-in module design for secure installation.
Q: What is the measurement current for the 7AT351.7 module?
A: This model requires a measurement current of 2 mA during operation.
