7AT352.70/PL3 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation 7AT352.70/PL3 is an analog input module from the System 2003 Controllers series. It features a 16-bit ADC resolution, supports two input channels, and measures temperatures from -200 to +850 degrees Celsius. The module is compatible with PT100 sensors under the IEC/EN 60751 standard and has IP20 protection.
Internal Product Review
The 7AT352.70/PL3 is a System 2003 Controllers analog input module engineered for PT100 temperature sensing. Technical performance is impressive, with 16-bit ADC resolution and fine 0.01 °C small-range resolution supporting accurate process feedback. A wide -200 to +850 °C measurement range makes the module an excellent fit for demanding industrial temperature monitoring.
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Product Description:
The 7AT352.70/PL3 belongs to the System 2003 Controllers series from B&R Automation. The unit is an analog input module that brings resistance-temperature detector signals into the controller backplane, allowing temperature feedback to be processed directly by the PLC without additional signal conditioning. Within an automation cell, it translates PT100 sensor values into digital data so the control program can monitor process heat, trigger alarms, or regulate heaters and chillers.
This module digitizes two independent channels with an A/D converter that operates at 20 ms when the mains frequency is 50 Hz and 16.67 ms when the mains frequency is 60 Hz, so cycle times remain synchronized with the power grid. Each conversion produces a 16-bit value, giving 65,536 discrete steps across the measurement range. Basic system error is limited to ±(0.17 + 0.0005 × TF) °C at 25 °C, combining offset and temperature-drift components for predictable accuracy. The board draws only 0.4 W from the internal supply, minimizing cabinet thermal load and permitting high-density I/O placement. Two front connectors accept field wiring, and the module remains passive because a fixed 2 mA measurement current is supplied to each sensor loop.
The temperature span extends from -200 °C up to +850 °C, matching the limits of the Class B platinum element listed in IEC/EN 60751. For wide spans, the controller records increments of 0.1 °C; in narrower application windows, it refines that to 0.01 °C to capture subtle variations. Wiring follows a 3-wire scheme that compensates for lead resistance without requiring a fourth conductor. Protection class IP20 permits installation in enclosed, ventilated panels, and conformance with the PT100 standard supports sensor interchangeability across vendors. All signals remain referenced to the shielded backplane, allowing the System 2003 base station to distribute conditioned temperature data to motion axes, safety interlocks, or recipe managers without additional hardware.
