Digital Input Trigger Setup
This guide shows you how to configure the OV20i's digital inputs to trigger camera inspections from external devices. The camera has 2 digital inputs that detect True/False signals from sensors, switches, PLCs, or other automation equipment.
When to Use Digital Input Triggers: Automated production lines with sensors, manual trigger switches, PLC-controlled inspections, conveyor belt integration, or any external device that needs to signal the camera to start an inspection.
Prerequisites
- OV20i camera system set up and connected
- Active recipe configured with imaging and inspection setup
- External trigger device (sensor, switch, PLC output, etc.)
- Understanding of NPN digital input wiring
- M12 connector access for wiring
Digital Input Specifications
The OV20i provides 2 digital inputs accessible via the M12 connector:
| Input | Pin # | Wire Color | Function |
|---|---|---|---|
| Digital Input 1 | 8 | Orange | Configurable trigger input |
| Digital Input 2 | 9 | White | Configurable trigger input |
Operating Logic:
- NPN Input Type: Common ground switching
- True (ON): Input connected to ground (0V)
- False (OFF): Input open or at 24V
- Signal Voltage: 24V DC nominal
Digital Input Wiring
NPN Wiring Configuration
Standard NPN sensor connection:
+24V ──→ Sensor Power
Ground ──→ Common Ground
Sensor Output ──→ Camera Digital Input Pin
Important: The OV20i uses NPN inputs, which means the input goes True when connected to ground.
Use Node-RED to access the signal from the input nodes.