PLC Task

The PLC Camera Base handles the PLC to Camera interaction. By separating the PLC task and Vision task, the PLC task is allowed to run at a faster clock cycle than the Vision task so that other PLC functions are not affected by the slower processing of images. The PLC task is used to run the vision jobs that are setup in the vision task. It also has access to vision results so that it may be used in a PLC process.

FB_PlcCameraBase

1	`FUNCTION_BLOCK FB_PlcCameraBase EXTENDS FB_ComponentBase`

Class Diagram

classDiagram


class FB_PlcCameraBase{
    CreateEventsI()
    CyclicLogic()
    GetResults()
    Reset()

    RunVision
    TriggerImage
    VisionAlarms
}

FB_PlcCameraBase--|>FB_ComponentBase

Outputs

Name	Type	Description
RunVision	BOOL	This will run the vision to aquiring when high and stop the aquiring when low
SoftwareTrigger	BOOL	This will software trigger the camera to take an image
Reset	BOOL	This is used to reset vision system when under error

Inputs

Name	Type	Description
CameraState	ETcVnCameraState	This is a status of the camera's state
ResultsAvailable	BOOL	This will let the PLC task know that there are results
NumberOfResults	UDINT	This is the number of elements found in the results
Results	ARRAY[1..MAX_RESULTS_BUFFER_BYTES] of BYTE	The data type that is put into buffer will be decided at application time from the process of analysis. Each side will have to define the structure of results needed for PLC task to function
VisionError	BOOL	This is set when there is an error
VisionErrorID	UDINT	This is the value of the Alarm when one is set
VisionAlarms	ARRAY[1..5] of FB_TcAlarm	Alarm object used with Event Logger