X20DS438A B & R Automation
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The X20DS438A is a digital input/output module manufactured by B & R Automation as part of the X20 Fieldbus Input Output Modules series. It features four IO-Link master ports, supports a digital I/O voltage of 24 VDC, and operates with IO-Link version 1.1. This module has an IP20 protection rating and is designed for control cabinet installation with a maximum operating elevation of 2000 meters.
Internal Product Review
The X20DS438A is a B & R Automation fieldbus input/output module with 4 IO-Link master ports and 24 VDC digital I/O capability. IO-Link V1.1 support and Nettime functionality make this unit especially effective for synchronized communication in distributed automation. A strong choice for control cabinet installations, highlighted by the 4-port IO-Link master configuration.
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Product Description:
The X20DS438A is a fieldbus I/O module built by B&R Automation for the X20 Fieldbus Input Output Modules series. It combines digital input and output channels with IO-Link master functionality, allowing connection of standard 24 V sensors and actuators while also communicating with smart IO-Link devices. Within an automation system, the module transfers process data between remote sensors and the central controller and supports time-critical synchronization over the network. By handling standard switching signals and intelligent device communication in one slice, it can reduce the need for separate interface hardware in a compact I/O station. This makes it suitable for machine sections where local signals and serial sensor data must be gathered at the same network node.
The digital section operates from a supply of 24 VDC, so wiring can follow common control-level power standards. The module provides 4 independent IO-Link channels, and the transceiver complies with IO-Link specification V1.1. It operates as the network Master, which allows the PLC to manage device parameters, diagnostics, and cyclic data exchange through the module. An enclosure protection rating of IP20 requires installation inside a control cabinet. The design permits mixed inputs and outputs on each channel, and the NetTime function is available for deterministic time stamping. Each port can support direct device communication without requiring an external IO-Link hub, which simplifies local wiring in compact assemblies.
In service, the module tolerates installation heights up to 2000 m above sea level and can work in environments with relative humidity up to 95% when no condensation forms. It withstands shock loads of 15 g and vibration levels of 1 g, which supports use on machinery with moderate dynamic loads. The product is rated for Overvoltage Category II, is not intended for condensing operation, and uses conformal coating on the electronics to help resist atmospheric moisture. These limits suit enclosed industrial control cabinets where airborne moisture may be present but liquid water is not expected to form on energized components.
