The graph window

Use

You can use the graph window during supervision to evaluate the state of one or more process components over time and to detect adverse trends at an early stage. IGSS is capable of combining current trends and historical data in the same graphs. You can thus see at a glance what happened in the process just before and immediately after an intervention.

Description

A graph can be predefined by the system designer or created on-the-fly by the operator during supervision. A predefined graph belongs to an area and can be accessed from the Graph menu when the parent area is active.

You may specify or modify the properties of a graph in the Define Graph Parameters dialogue. Click here for details

Graph window elements

The graph window contains the following elements. Click the Show Me button at the top of this window to see the location of each element.

The graph window contains the following elements.

Element	Description
Title bar	contains the following elements: · $images\ico_sys.gif$ System menu box Click this button to access a menu from which you can move, resize, minimize, maximize and close the current graph window or go to the next graph window. · Name and/or description of the graph, for example, Temperature_T1. · $images\ico_min.gif$ Minimize button Click this button to minimize the graph window. · $images\ico_max.gif$ Maximize button Click this button to maximize the graph window. · $images\ico_close.gif$ Close button Click this button to close the graph window.
Graph area	shows the graph according to the properties specified in the Define Graph Parameters dialogue which is accessed by right-clicking on the graph.
Horizontal scroll bar	allows you to scroll through graph data on the time scale. This means you can look backward in time and display past time responses of the process object by moving the scroll bar to the left.
Graph status bar	shows the current date and time and the numerical values of the y-variables displayed in the curves of the chart.