Watlow EZwarePlus Programming - Manual (Page 143)

EZwarePlus Programming Manual 135
The PLC must only enter window numbers that represent full-size windows when using the PLC Control Object
function. The HMI automatically closes any open windows before the window called by the PLC Control Object is
displayed.
The Direct and Indirect Window Objects
If you want the PLC to call up a popup window that is to be overlaid on top of other windows already open, then
there are two methods used to do this:
• Direct Window Object
• Indirect Window Object
 Unlike the PLC Control Object, the Direct and Indirect Window Objects are only active for the windows into which
they are placed.
The Direct Window Object is used to display a popup window using a PLC coil. The HMI continuously reads the value
of the PLC coil to determine its state. If the trigger state is detected, then the designated popup window is displayed
within the frame of the Direct Window Object..
The Indirect Window Object is used to display a popup window using a PLC data register. Similar to the PLC Control
Object, the HMI continuously monitors the selected PLC data register. It will display any popup window that
corresponds to the number placed into the PLC data register by the PLC.
The PLC must reference a window that is less than full size when using the Direct Window and Indirect Window
objects.

To call a popup window using the Direct Window Object:
1. From the Objects menu, select Direct Window. The New Direct Window Object dialog box appears.
2. Select the trigger state in the Trigger drop-down box (ON or OFF).
3. Click the Setting… button in the Read address section and select the PLC address according to Device type
selected from the drop down menu and then enter the address.
4. Select the format from the drop down menu and click OK.
5. Select the Window No. you want to call from the drop down menu under the Attribute heading.
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