Camera frame and encoder position get out of sync in high belt speed

[spoorgholi74]

Camera frame and encoder position get out of sync in high belt speed

[HighImp]

Hi,
Just a guess, but like you said, the camera can still exposure or transmitt Image n, while Trigger n from plc is processed by the PC, and read the last complete Image from Buffer, which is Image n-1.

May you can wait in your plc for one frame period after the camera trigger before informing the PC?

Best regards

[cpt-wojtech]

Hello @spoorgholi74 ,
when utilizing the LatestImageOnly strategy the buffer in the queue is overwritten immediately if a new buffer is available. So basically there is no possibility that you read out the previous image if really a new image is available. That is why I think too it's an desync issue and your handshake with the PLC happens faster at some point while the camera hasn't delivered the image yet. This should happen more or less after a defined period of time (there is some variation because of possible jitter and transmission delays on the ethernet line) and after some more time the desync should get even bigger.

Please take into account the parameters ExposureTime and ResultingFramerate of the camera and calculate if the timings fit into the speed of you conveyor belt signal (some more info about acquisition timings here