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 supply;2. DC-: Negative pole of external DC power supply;3. : 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-in;2. COM1--COM16: Relay public interface;3. 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.