X20DC4395 B & R Automation
Wake Industrial LLC is not an authorized distributor of this product.
The B & R Automation X20DC4395 is a digital counter module in the X20 Fieldbus Input Output Modules series. It supports up to four AB incremental encoders, two SSI absolute encoders, and four PWM outputs. The module features eight event counters and operates with an encoder signal voltage of 24 V.
Internal Product Review
The X20DC4395 is a highly capable digital counter module built for precise encoder interfacing in automated machinery. Support for 8 event counters and local time measurement gives timing and diagnostic tasks a very polished feel. Four PWM outputs add valuable control flexibility, making this module a strong fit for coordinated motion applications.
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Product Description:
The X20DC4395 is a plug-in module produced by B & R Automation for the X20 Fieldbus Input Output Modules series. It acts as a counting and timing interface that lets a machine controller capture fast edge changes from incremental or absolute encoders, tally production events, and generate pulse-width signals for motion or process tasks in automated equipment. This allows the control system to handle fast signal evaluation directly within the I/O station instead of relying on slower general-purpose processing.
This module is identified as a Digital Counter Module, so the onboard logic is optimized for high-speed pulse evaluation rather than analog conversion. It can accept feedback from 4 AB incremental encoders, letting a PLC determine position and speed on up to four axes that use quadrature signals. Two additional inputs are reserved for 2 ABR incremental encoders, and the index track supports precise zero referencing at every revolution. All encoder lines are read with a 24 V signal level, matching the standard sensor supply used in most industrial cabinets. For process totals or batch sizes, the board supplies 8 event counters, and each one can accumulate discrete triggers from proximity switches or photo eyes without taxing the main CPU.
The module can drive actuators or test devices through 4 PWM outputs, where duty cycle is modulated directly in hardware to regulate valves, LEDs, or small motors. It also accepts data from 2 SSI absolute encoders, giving single-turn or multi-turn position values over a synchronous serial link when incremental measurement is not sufficient. Time-stamping of every captured edge is supported by local time measurement, so motion events remain deterministic even if network jitter is present. A controller can therefore use one X20 slot for encoder capture, event counting, and hardware-modulated outputs.
