I have 4 analog signals going to the input of SCAL change with a certain range. The output of SCAL is going to the trend. My question is how do i start and stop the trend with the external start and stop switch. It would be great help if someone can answer my question.
I have attached the jpg. file which shows the FBDs. Appreciate for you help.
Sorry for delayed answer was engaged in some morning sessions.
As answered above only way you can connect external switch to the EN pin of the block and as image attached in answer above set that via block parameterization.
But what is the usecase ? Because trend block used, not only for real-time value trending but for archiving also. and that is why you are using TREND block. I don't recommend start/stop trend. and that is why you can not find any button to start/stop trend as you can find incase of logs. incase you don't want to show some values you can remove it there is check box to display/hide in trend area. or if you don't want to archive but just want real time trending then use trend window from animate option.
Hope that helps.