Triggering Acquisitions Internally

To test the maximum possible rate without an external trigger, a trigger inspection can be created. Its job is to generate triggers at regular intervals to another inspection. The Job achieves this by selecting a virtual I/O signal to be generated from one Inspection and then using the same signal as the trigger in another Inspection, as shown in Figure 1-9.

FIGURE 1-9. 

Trigger Inspection for Pipeline Continuous Mode

Two Digital I/O Steps create a High->Low transition on the Virtual I/O Point 101. The Acquire step in Vision Inspection is programmed to accept Virtual I/O Point 101 for the trigger with High->Low polarity. The Wait Step wait time is selected such that the inspection can run at maximum speed without overrunning.

Note: This can also be achieved from the host with VB code attached to a Timer object. Then, the VB code can assert a Virtual I/O Point at periodic intervals, causing the inspection running on the GigE Camera or VS-1 Smart Camera to receive a trigger.