Yes, when the charts are stopped the ival will not update. Perhaps if you moved the IO point to a variable and then connected the variable to the groov it would work better. You would have a chart running that would move the point to a variable, and this would cause the IVAL to update. There is not a lot of speed needed to read IO points from a brain. Where some people have problems is by having too many devices scanning a brain at one moment. Or if they have a chart that loops back to the top without a time delay in it to slow it down a little… even a few ms, I hope this makes sense to you, below is page 154 from the PAC manual #1700:
