Osisoft - The xy plot in pi processbook. v3.0

In ProcessBook Version 3, there was a new hybrid introduced -- a hybrid type of Trend called the XY Plot, and in the XY Plot, instead of having Time on the Horizontal Scale, what you have is another Tag's Value. So, you are not comparing a Tag's Values over time, you are comparing a -- one Tag's Values to another Tag's Values, and hopefully you are comparing them at reasonably close intervals. And, we will show you what we mean by that. If you click on Draw and XY Plot, you will notice that the cursor changes to very -- something very similar to the Trend Object. I will draw on my little square here. And this looks very much like the Trend Control, with a few small differences. First, let's go to the Tag Search, and in this case, I have two tags on my system that are Sine Waves. They are Sinusoid and SinusoidU, the difference being that SinusoidU is based on UTC, and Sinusoid is based on my, my current location as my offset from UTC. And, the difference in the tags in Plot Area is that in the XY Plot there is a radio button And we have to tell the system which tag to use for the X Axis. Now, you can compare it to multiple tags. I could have five tags listed here. Whichever tag had the radio button checked would be the one that is the base for the comparison, or the X Axis, the tag's that's along the bottom. And what we need to do is determine the re... data retrieval methods for each one of these tags. So, for the X, X Axis Tag on the bottom, we could either use an interpolated method or use a recorded method. Interpolated will get Values over a certain period of time. Let's, let's do Now minus two hours. And it will get those Values every ten minutes, and you can put any, any Value in here you want. If you want a little greater interval, you can do that. And, for the additional tags, you will notice when I click on the tag that's not checked with a radio button, the data retrieval method switches to the Y Tags, and these I have many choices. I can either use the same interpolated or recorded choices, or I can choose to synchronize or match my data to the, the other tag's data. I am going to use Synchronize which will use the same timestamps that we used for the original tag. Again, I am going to use my Now minus two hours, and Now for my Flat Time Interval of five minutes. And, over in the Scale, we have the same Options that we had for the Trend Object. And, the Plot Title I can call my Scatter Plot. That's very often what they are called. And, when we click OK, we can see that we get a Trend Object that, instead of Trending Tags Values over time, we are Trending Tags Values against one another. And you can see, if I mouse over one of the Values, you can see the, the intersection, the, the Value of SinusoidU vs the Value of Sinusoid. So, my Value of SinusoidU is my Y Axis, and my Value for Sinusoid, which in this case is 98.542, is the, is along the X Axis. And, up at the top, you can see the coefficient is Negative .8789. Closer you are to One is the, the stronger correlation. Now, the only differing in the Display Format and the Plot Format, really, the, the most important disp... difference is this last and next to last Marker Color. If you uncheck Match Trace, you can set individual colors for the last color and next-to-last, which kind of makes it interesting because then you can see where, which direction things are going. And in this case, my last Marker Color was bright red and my next-to-last was a littler darker red. So you can see that we are moving along this Trend in a certain progression. And you can sort of see which end of the Trend or which, which way you are going, so that's [inaudible] of the XY Plot.