Structural Features:  1. Use Hongfa relay, stable and reliable performance;  2. Compatible with two input modes of positive control and negative control;  3. Each channel has an LED action indicator for a more intuitive understanding of product performance;  4. Each channel adopts optocoupler isolation to enhance anti-interference performance and isolation performance;  5. At the same time, the power supply and the "IN" control terminal are independently controlled;  6. The module adopts the standard "DIN" rail-type installation design, which is convenient and quick to install, firm and stable.     Technical Parameters:  1. Trigger signal: DC5V / 12 / 24V (Optional).  2. Each trigger signal current: 5mA.  3. Power supply voltage: DC5V / 12 / 24V.  4. Each coil current: 18.8mA.  5. Contact type: one normally open and one normally closed (single pole).  6. Maximum load current of each contact: 10A.  7. Action time: below 12ms.  8. Reset time: less than 4ms.  9. Maximum switching frequency: 18000 times / hour.  10. Mechanical life: more than 20 million times.  11. Relay installation: plug-in type (No).  12: Module installation method: DIN standard rail installation.     Positive control wiring introduction:  1. Power input terminal:  VCC is connected to the positive voltage, GND is connected to the negative voltage, and S / S is connected to the negative voltage IN1, IN2 are connected to positive voltage control, IN1 controls KI terminal, IN2 controls K2 terminal.  2. Control device output:  The output terminal is clearly marked with 234, 3 is a common point, 2 is normally open, and 4 is normally closed. K1, K2 means two relays work.  Negative control wiring introduction:  1. Power input terminal:  VCC is connected to the positive voltage, GND is connected to the negative voltage, and S / S is connected to the positive voltage IN1, IN2 are connected to negative voltage control, IN1 controls KI terminal, IN2 controls K2 terminal.  2. Control device output:  The output terminal is clearly marked with 234, 3 is a common point, 2 is normally open, and 4 is normally closed. KI, K2 means two relays work.     Package includes:  1 x Relay board