Features: 1. Enhanced power supply anti-reverse connection function; incorrect power supply won't damage the module. Fail-safe design ensures the relay remains inactive if the control line breaks. 2. Utilizes genuine high-quality relays with a normal open interface load capacity of AC 250V/10A and DC 30V/10A. 3. Equipped with a high-quality, small, two-way isolated optocoupler for strong anti-interference capabilities and stable performance; requires only 5mA trigger current. 4. User-selectable relay control level: high-level or low-level trigger. 5. Built-in current-limiting resistor allows direct control by the positive and negative poles of the power supply or via the I/O port of a single-chip microcomputer. Specifications: Module Control Terminal: 19-wire interface with convenient wiring terminals for user connection. 1. DC+: External DC power supply positive (5V, 12V, and 24V modules available). 2. DC-: External DC power supply negative. 3. XM: Photoelectric isolation chip common terminal. - For high-level control: Connect this signal to the negative pole of the user control board's power supply. - For low-level control: Connect this signal to the positive pole of the user control board's power supply. 4. X1-X16: Relay control interface. - If XM is connected to the power supply's negative pole: The corresponding relay closes when this port is high (relative to XM). - If XM is connected to the power supply's positive pole: The corresponding relay closes when this port is low (relative to XM). Relay Output Terminal: 48-wire interface with convenient wiring terminals for user connection. 1. NO1--NO16: Relay normally open interface. The relay is suspended before closing and short-circuited to COM after closing. 2. COM1--COM16: Relay common interface. 3. NC1--NC16: Relay normally closed interface. The relay is short-circuited with COM before pull-in and suspended after pull-in. Package List: 1 x Module Note: This isolated relay module is designed for harsh electromagnetic environments or high signal requirements. For complete isolation, the power supply for the user control panel (connected to XM) and the power supply for the relay module (DC+/DC-) should be separate.