The 5A1 PLC Addon Boards series is a group of ISA expansion boards designed to extend communication capability in B&R control and AT-compatible PC-based systems.
The series includes board variants for RS232, ARCNET, and Profibus communication, with configurations that provide two electrically isolated serial channels, four serial interfaces, or dedicated fieldbus network connections depending on the model. These boards are intended for ISA-slot installation, with certain versions designed for 16-bit full-size slots and others using more compact card formats. Serial interface versions support configurable COM port assignment and selectable interrupt settings through onboard jumper configuration, allowing the hardware to be adapted to the host system architecture. Overall, the 5A1 PLC Addon Boards series serves as a communication expansion platform for integrating serial devices and industrial networks into legacy B&R and PC-based automation environments.
