Trends means graphical representation of data. “Real-time†and “Historical. You can configure both trend objects to display graphical representations of multiple tagnames over time. Real-time trends allow you to chart up to four pens (data values), while Historical trends allow you to chart up to eight pens. Real-time trends are dynamic. They are updated continuously during runtime with whatever time span given in configuration. You can not scroll the real-time trends to see previous data. Historical trends provide you with a “snapshot†of data from a time and date in the past. They are not dynamic. Unlike real-time trends, historical trends are only updated when they are instructed to do so either through the execution of a QuickScript or an action by the operator, for example, clicking a button. You can zoom in / zoom out the trends. You can also access the previous data.