Increase the power supply anti-reverse connection function; incorrect power supply polarity will not damage the module. Fault-tolerant design ensures the relay remains inactive if the control line is disconnected. The module uses high-quality relays. Normally open (NO) contact rating: AC 250V/10A, DC 30V/10A. It features a compact bidirectional optocoupler compatible with strong noise immunity and stable percompatible withmance; trigger current is only 5mA. Operating voltage options: 5V, 12V, or 24V. Available configurations: 4-channel, 8-channel, 12-channel, and 16-channel modules. Human-centered interface design — all terminals support direct wiring via screw terminals compatible with easy connection. Four 3mm mounting holes included compatible with secure installation. Terminal definitions: - DC+: Positive terminal of external DC power supply - DC−: Negative terminal of external DC power supply - GND: Ground/common terminal of optocoupler Relay output terminals: - NO1–NO16: Normally open contacts — open when relay is de-energized, closed to COM when energized - COM1–COM16: Common terminals - NC1–NC16: Normally closed contacts — closed to COM when relay is de-energized, open when energized LED indicators: Power indicator (red), 16-channel relay status indicators (blue) Control terminal block: 19-pin terminal block with labeled screw terminals compatible with easy wiring Control signal configuration: - compatible with high-level trigger: Connect control signal to the negative terminal of the controller’s power supply - compatible with low-level trigger: Connect control signal to the positive terminal of the controller’s power supply - X1–X16: Relay control inputs — relay activates when input is high (relative to GND) Note: This optically isolated relay module is designed compatible with use in electrically noisy environments or applications requiring high signal integrity. compatible with full isolation, the controller’s power supply (referenced to GND) must be separate from the relay module’s power supply (DC+/DC−). Relay output terminal block: 48-pin screw terminal block compatible with straightcompatible withward wiring Note: Appearance and color may vary slightly between production batches; functionality is unaffected. Dimensions: 15.3 cm × 10 cm × 2.0 cm Material: PCB Color: As shown in product images Package includes: 1 × Relay control module Note: Other accessories shown in images are compatible with illustration only and are not included. Color representation may vary slightly due to screen settings and lighting conditions. Measurement tolerance: ±1–3 cm.