Compact I/O and relay expansion module designed for scalable access control and security systems. Compatible with AXIS A9210 and Axis door controllers, it delivers 16 supervised inputs/outputs and 16 Form C relay outputs, with support for up to 128 I/Os and 64 relays via a single IP connection. Ideal for high‑density applications like elevators and data centers, it offers flexible installation and seamless integration with third‑party systems. Part number 03504-001.