Omron CX-SUPERVISOR - V2.0 - INDEX

APPENDIX F – Obsolete Features OMRON
Page 314 Release 2.0
With ‘DDE Client Points’ all data transfers or conversations are initiated by CX-Supervisor either
sending data to or requesting data from external DDE Server Application(s). For example, a CX-
Supervisor point could be linked to update a cell on a Microsoft Excel worksheet.
With ‘DDE Server Points’ all data transfers are initiated by external DDE Client Application(s) either
requesting or sending point values. For example, a value could be entered into a cell in Microsoft
Excel which would update a CX-Supervisor point.
DDE Client Points
A DDE client point sends data to or requests data from an external server application. This chapter
explains how to create points that make use of the CX-Supervisor DDE Client capabilities. In order
for data to be transferred between a point and a server application the point must uniquely identify the
application and the data that is to be used in the transfer. DDE applications use a three-tiered
identification system to distinguish themselves from other DDE applications. An application name is
at the top of the hierarchy, the application name refers to a server application e.g. “EXCEL”. A topic
name further defines a server application e.g. for Microsoft Excel the topic would define the
worksheet to be used e.g. “SHEET1.XLS”, a server can support one or more topics. Finally each
topic can have one or more item names, which uniquely identifies a data item within a topic, i.e.
“R1C1” or a cell name reference identifies a single cell within a Microsoft Excel worksheet.
Example
A DDE Client point named “DDE1” that connects to Microsoft Excel, worksheet – “Sheet1.xls” and
cell “R1C1”, is created.
1, 2, 3…
1. Select the Add Point button from the Point Editor toolbar. The Add Point
dialog is displayed.
2. Enter “DDE1” in the Point Name: field.
3. Set the I/O Attributes setting to DDE and click on the Setup pushbutton.
The DDE attributes dialog is displayed.
4. Enter “Excel” in the Server Name: field. This is the name of the external
DDE server application.