Using the Graphics Editor SECTION 2 Basic Tutorial Now that the main structure of the traffic signal is complete (although rather basic), work can begin on the coloured lights. Only two lights are needed, one red and one green; 6. From the Graphic Object Bar toolbar, click the button and draw a circle of appropriate size to represent the light. Holding the CTRL key down while drawing an ellipse ensures that a true circle is drawn. 7. Select the colour red and then position the light at the top of the traffic signal. 8. Repeat the process for the green light and position this at the bottom of the traffic signal.
2-5-1 Adding a Point Now we need to define a variable by which the traffic signal is to be controlled. As there are only 2 states i.e. 'GO' and 'STOP' a Boolean or digital value will be used. For simplicity of this tutorial this 'Point' or variable will be a local memory point. For a real application of course we would be connecting to a PLC and reading a digital input. Except for the following point definition the rest of this tutorial is identical to a real monitoring application. 1, 2, 3… 1. From the main toolbar, click the button. The Point Editor window opens. 2. Click the button. The Add Point dialog is opens: 15