SMD optocoupler isolation, strong driving ability, stable performance; trigger current 5mA
The module voltage 5V
Each channel module can be set high or low triggered by jumper
Fault-tolerant design, even if the control line is broken, the relay will not operate
Power indicator (green), relay state indicator (red)
Interface design user-friendly, all interfaces are available through the wiring terminal direct connection leads, very convenient
Module size:  141.5mm * 50mm * 18.5mm (L * W * H)
4 mounting bolts holes, hole 3.1mm, spacing 136.5mm * 45mm

Module Port:
DC+: DC power supply positive

DC-: DC power supply negative

IN1: Channel 1 signal trigger terminal

IN2: Channel 2 signal trigger terminal

IN3: Channel 3 signal trigger terminal

IN4: Channel 4 signal trigger terminal

……

Relay Output:
NC1: Channel 1 relay normally closed pin

COM1: Channel 1 relay common pin

NO1: Channel 1 relay normally opened pin

NC2: Channel 2 relay normally closed pin

COM2: Channel 2 relay common pin

NO2: Channel 2 relay normally opened pin

NC3: Channel 3 relay normally closed pin

COM3: Channel 3 relay common pin

NO3: Channel 3 relay normally opened pin

NC4: Channel 4 relay normally closed pin

COM4: Channel 4 relay common pin

NO4: Channel 4 relay normally opened pin

……

High And Low Level Trigger Option:

1. S1: It is option switch for channel 1 relay

2. S2: It is option switch for channel 2 relay

3. S3: It is option switch for channel 3 relay

4. S4: It is option switch for channel 4 relay

……