7AT664.7 B & R Automation
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The B & R Automation 7AT664.7 is a screw-in module from the System 2003 Controllers series, designed for temperature measurements using thermocouples J, K, and S. It offers four sensor inputs with a 16 bit resolution and supports automatic in-module conversion with a raw value resolution of 2 microvolts per LSB. The module features per input sensor selection, temperature compensation, and a maximum power consumption of 0.4 watts.
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Product Description:
The 7AT664.7 thermocouple input module is produced by B&R Automation for the System 2003 Controllers series. This screw-in expansion unit installs beside the CPU and converts millivolt signals from attached thermocouples into numerical data that the controller can use for temperature monitoring, alarming, or closed-loop control in industrial machines. It supports applications such as heating sections, molding equipment, and process vessels where thermal conditions must be tracked continuously. By placing temperature acquisition in a dedicated module, the control system can handle several sensing points without relying on separate signal converters.
The onboard A/D converter works at 16-bit resolution, allowing each of the module’s 4 input channels to capture fine changes in junction voltage. With a raw value step size of 2 µV/LSB, the electronics can detect very small voltage differences, which corresponds to a temperature granularity of 0.1 °C/LSB after linearization. Despite this precision, the device draws only 0.4 W at maximum load, which helps when several modules share the same backplane power bus. Each channel can be assigned its own sensor type, so different process zones can be monitored independently and compared by the controller during operation.
The module uses automatic in-module conversion, which offloads temperature calculation from the host CPU and simplifies application processing. Mechanical integration is supported by its screw-in module format, and it is keyed for the AF101 Adapter Module, CP-Interface slot used in every System 2003 rack. Cold-junction compensation helps limit measurement drift, and the lack of input-to-input and input-to-controller isolation keeps the circuit arrangement straightforward. Compatibility with J, K, and S thermocouples broadens the usable range for furnaces, cryogenic lines, and standard process heating zones. This flexibility allows the same module family to support both high-temperature and low-temperature sensing tasks within the same control platform.
