Increase the power supply anti-reverse connection function, the wrong power supply will not damage the module fault-tolerant design, the control line is broken, the relay will not operate The module adopts high-quality relays, normally open interface rated load: AC 250V/10A, DC 30V/10A It adopts small bidirectional isolation optocoupler, which has strong anti-interference ability and stable performance the trigger current only needs 5mA The working voltage of the module is 5V, 12V, and 24V to choose from there are also 4-way, 8-way, 12-way, and 16-way modules to choose from The interface design is humanized, and all interfaces can be directly connected through the terminals, which is very convenient.There are four 3mm fixing bolt holes for easy installation 1. DC+: Positive pole of external DC power supply2. DC-: Negative pole of external DC power supply3. : common terminal of photoelectric isolation chip 1. NO1--NO16: The relay normally open interface, the relay is suspended before the pull-in, and it is short-circuited with COM after the pull-in2. COM1--COM16: Relay public interface3. NC1--NC16: Normally closed interface of the relay, short-circuit with COM before the relay pulls in, and hang in the air after the pull-in Power indicator light (red), 16-way relay status indicator light (blue) Module control terminal: There are 19 wire interfaces, all interfaces have terminal blocks, which is convenient for users to connect If high level control is used: this signal should be connected to the negative pole of the power supply of the user control board If low-level control is used: this signal should be connected to the positive pole of the user control board power supply 4. X1-X16: relay control interface, If is connected to the negative/positive pole of the power supply: when this port is high (relative to ), the corresponding relay is closed Note: The isolated relay module is designed to adapt to the occasions where the electromagnetic environment is relatively harsh or the signal requirements are relatively high. If a complete isolation effect is to be achieved, the power supply of the user control board (that is, the reference power supply connected to ) and the power supply supplied by the relay module (DC+/DC-) should be distinguished. Relay output terminal: There are 48 wire interfaces, all interfaces have wiring terminals, which is convenient for users to wire note: Due to different batches, the appearance and color of the product , but it does not affect the use. size: 15.3cm x 10cm x 2.0cm Material: PCB colour: As shown Package Contents: 1 x relay control module Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.