RDB-D08 is a terminal board used to duplex digital input module (DI), supporting spring clamp terminal wiring, which can effectively simplify the wiring process and shorten the system installation time. It supports disconnection detection function to ensure that the alarm will be trigged in time when it disconnects from the I/O module and further improves the safety and stability of wiring signals to reduce the risk of system failure. These features are especially important for industrial environments that require high reliability and stability.