I/O Timing Diagrams

This page details digital I/O timing specifications for the OV20i, including trigger signal timing, output latency, and recommended pulse widths.

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Digital Input Timing

Trigger Input Timing (Pin 16)

Parameter	Spec
Input Activation Type	NPN (Pull to GND)
Minimum Pulse Width	10 ms
Input Debounce	~5 ms
Max Input Frequency	~20 Hz
Signal Type	Dry contact or open collector

Trigger fires once per pulse

Ideal for sensors with clean output transitions

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Digital Output Timing

Result Output Timing (Pins 10 & 11)

Event	Timing
Output Activation Delay	~10–15 ms after inference
Output Active Duration	Configurable (default 100 ms)
Max Current	100 mA
Output Logic Type	NPN open collector (pulls to GND)

note

External pull-up to 24 VDC is required for most PLCs.

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Typical Timing Sequence (Digital Trigger)

CopyEdit
     Trigger Pulse
         ___
        |   |____________________
        |
        |<-- 10 ms -->|

     Inference Timing (AI Process)
                      _______________________
                     /
    Result Output __/

        |<-- ~10–15 ms after trigger -->|

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Recommended Setup

• Trigger via dry contact, NPN sensor, or PLC sinking output
• Set minimum pulse width: 10–20 ms
• Configure output duration via UI or PLC tag if required

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Best Practices

• Use shielded cables to minimize noise
• Confirm rising/falling edge behavior matches PLC expectations
• Check output with a test light or multimeter during setup
• Avoid signal bounce by using sensors with built-in debounce