### Historical trend reporting logic To configure historical trend reporting, use the sequence of logic shown below in your graphic function block. This sequence is available from the InterOp® Tools section of the SuperVision® installation CD. The logic contains the following elements: The Alert Event microblock generates a trend report using an Event ID of TREND and the MbCode TRN1. NOTE Exec 3 controllers require a Message microblock because they do not support the Event microblock. The Binary parameter microblock determines whether trend reports are sent once per day or at some other frequency. This microblock uses the MbCode TRN2. A time parameter microblock determines how frequently the trend report is sent. This microblock uses the MbCode TRN3. If the trend report is sent once per day, a second time parameter microblock determines the time of day the trend report is sent. This microblock uses the MbCode TRN4. NOTE If you choose not to use this logic, you must at least include an Alert Event microblock in the GFB with an Event ID of TREND and enable trending on the Parameters page. When activated, this microblock tells the WebCTRL® application to collect historical trend data. You can include additional logic determining how often the TREND event should be activated, and set up the necessary parameters on the GFB’s Parameter page.