Product Description:

The X20DC2395 is a counting and timing extension manufactured by B&R Automation for the X20 Fieldbus Input Output Modules series. Mounted on the system backplane, it collects high-frequency pulse streams from motion sensors and delivers precise position or speed data to the CPU. By bringing high-resolution encoder feedback into the control network without external wiring converters, the unit simplifies axis coordination and event logging in packaging, printing, and general assembly lines.

The module is specified as a Digital Counter Module, which means its internal logic can latch edge changes with microsecond resolution and forward a numeric value to the CPU during each scan cycle. Its front-edge terminals accept 2 AB inputs for quadrature channels, letting the controller derive direction and velocity from incremental encoders. A separate differential path provides 1 ABR input so that a zero marker can be captured without sharing wires with the A and B tracks. To supply these sensors, the board furnishes a regulated 24 VDC encoder voltage that is short-circuit monitored. For discrete production metrics, it maintains 4 event counters that run independently of the main processor, avoiding jitter when multiple machines pulse at the same time.

Complementing the input functions, the card also generates motion references through 2 PWM outputs, enabling onboard duty-cycle control for proportional valves or low-voltage actuators without occupying the central processor. Absolute position devices can be wired to the dedicated 1 SSI input, giving the controller a loss-free fallback whenever incremental channels are unavailable. Timestamp accuracy is maintained by local time measurement, so every captured pulse is labeled against the module’s own clock rather than the bus scan, reducing synchronization drift in distributed architectures that rely on high-speed quadrature feedback during quick indexing moves.