The Yokogawa F3XD16-4N is a highly reliable, 4-channel Digital Input Safety Relay module designed for use in Yokogawa's ProSafe-RS safety instrumented system (SIS).
Its primary function is to receive dry contact signals (e.g., from emergency stop buttons, pressure switches, limit switches, or other safety devices) and transmit the state of these signals to the ProSafe-RS safety controller for logic processing. As part of a certified SIS, it plays a critical role in monitoring the state of safety-critical field devices and initiating a safe shutdown or action when a dangerous condition is detected (e.g., a contact opening or closing).
