Product Description:

The X20IF1091-1 is a communication module produced by B&R Automation for the X20 Fieldbus Input Output Modules series. It functions as an X2X Link master, allowing a controller to coordinate distributed I/O nodes over the system bus used by the X20 platform in modular automation equipment. The device is installed on a line-topology segment and integrates through a 4-pin male multipoint connector that carries both data and supply lines to connected modules. Internal bus termination is included, so no external resistor is required at the end of the segment.

During cyclic exchange, the module can transmit and receive up to 1488 bytes per direction, which is the maximum user data block handled in each network scan. The module has one interface, which simplifies addressing in compact control cabinets. Transfer timing is deterministic, and the design inserts a 1-cycle runtime shift per direction between master and slaves to keep update latency predictable. Segment lengths can reach 100 m without repeaters when standard shielded cable is used, and the electronics consume only 1.29 W, which helps limit heat inside densely populated racks. The connector style supports straightforward installation, and module and data-transfer status are shown by two LEDs that indicate operating and traffic conditions.

At the network level, the master can address up to 253 stations, allowing sizable I/O configurations to share the same cable across longer machine sections without exceeding the available cyclic data capacity. The enclosure carries an IP20 protection rating, so the module must be mounted inside a control cabinet but does not require additional sealing for touch safety. The unit boots with default communication parameters, and it only requires address assignment from the host PLC. The module has no internal bus supply, so 24 V DC must be distributed through the backplane or an auxiliary feed to power attached slices.