Trigger

Computes the local pipe value from the timestamp of a Fast Input time event.

• Pipe input values are passed through to the block output with no influence on the flow of pipe values.
• Typical application is for PLCopen Registration.

Figure 1: Example: Trigger extrapolates output value

There are network and mechanical delays in systems that make capturing a correct pipe position difficult.

To remove the delays, use a sampler block to capture the actual position of an axis.

Figure 2 shows how this works:

Figure 2: Example: Trigger Block

• This sampler block is configured to capture the actual position of axis 1.
  • The conversion and axis blocks are only needed to terminate the pipe.
  • MLTrigWriteDelay may still be needed to compensate for sensor delay.
    
• If you need to calculate the master pipe value corresponding to the captured axis position, add the difference between the axis command position and the master pipe value.

Parameter	Description
Input_Axis	Name of the axis where the Fast Input is located.
InputID	ID number of the Fast Input. InputID INT Range = 0 to 1 0 = Touch Probe 1 / Capture Engine 0 1 = Touch Probe 2 / Capture Engine 1
TriggerMode / Edge	The edge to trigger on. 0 = Disable the Fast Input. 1 = Rising edge. 2 = Falling edge.

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• • The trigger delay must be calculated by you and set with MLTrigWriteDelay.
  • This delay belongs to the sensor.
  • It is in addition to the MLTrigReadTime / MLTrigReadPos.

When you call the MLTrigClearFlag function, the flag for trigger is reset to FALSE. (Figure 3)

Figure 3: Example: MLTrigClearFlag = FALSE

When a Fast Input is set, the MLTrigIsTriggered function returns TRUE. (Figure 4)

Figure 4: Example: MLTrigIsTriggered = TRUE

Then call the MLTrigReadPos and MLTrigReadTime functions to get more details. (Figure 5)

Figure 5: Example: MLTrigReadPos and MLTrigReadTime details