X20ST4492 B & R Automation
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The X20ST4492 is a fieldbus input/output module manufactured by B & R Automation, part of the X20 Fieldbus Input Output Modules series. It supports two thermocouple input pairs with a voltage accuracy of 78 microvolts and a resolution of 2 microvolts, plus one RTD input pair with a Pt1000 accuracy of 0.53°C. The module offers 24-bit converter resolution, requires a nominal voltage of 24 VDC, and features channel-bus isolation rated at 500 VDC.
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Product Description:
The X20ST4492 analog temperature module is produced by B&R Automation within the X20 Fieldbus Input/Output Modules series. As a plug-in slice for the distributed I/O platform, it gathers precise temperature data from resistance temperature detectors and thermocouples and passes those values to the fieldbus. Integrating this module into a PLC station allows centralized logic to receive high-resolution measurements from remote zones, enabling closed-loop control of heating, cooling, or material processing stages in industrial automation. It connects over the system backplane and derives its logic supply from the bus, avoiding separate wiring while maintaining a compact footprint in control cabinets.
The module draws only 0.25 W from the backplane bus, while a separate 1.2 W internal supply powers its analog front end for stable sensor excitation. Electrical separation between field and logic is maintained by a 500 VDC channel-bus isolation barrier, limiting fault currents that could otherwise propagate to the controller. The sigma-delta converter digitizes inputs at 24-bit resolution, so small signal changes are preserved even after filtering. An analog low-pass network with a 500 Hz cutoff attenuates conducted noise before sampling, and the design maintains a common-mode rejection ratio above 70 dB to further suppress ground offsets. For typical installations, the module expects a system supply of 24 VDC and accepts source resistances up to 20 Ω without degrading linearity.
For resistance sensors, one RTD input pair is available, and line lengths may extend to 50 m with a maximum loop resistance of 5 Ω. When a Pt1000 element is connected, absolute measurement error stays within 0.53 °C, supporting tight process tolerances. Two thermocouple channels handle differential signals, and their front end achieves a voltage accuracy of 78 µV across a span of ±65 mV. The least significant code on those channels corresponds to only 2 µV, permitting detection of subtle temperature gradients in reactors, ovens, or dryers.
