Prosoft-technology MVI46-DFNT Manual do Utilizador descarregar pdf (Página 139)

MVI46-DFNT ♦ SLC Platform Reference

EtherNet/IP Client/Server Communication Module User Manual

ProSoft Technology, Inc. Page 139 of 177

October 12, 2010

The C

OMMUNICATION DRIVER should be set to the ETHIP driver. Make sure the

LOCAL option is selected in the LOCAL OR REMOTE ADDRESSING section of the

dialog box. You should not have to alter any data on this tab, as RSLinx knows

the communication path. Now click the APPLY button to implement the options

and to establish the topic.

You are now ready to use the DDE link in a DDE client application. The following

example shows how to define a DDE link in an Excel Spreadsheet. It is also

possible to define a DDE link in a Visual Basic program. Any other Windows DDE

client application could be used including SoftLogix and RSSql.

Defining a DDE link in Excel

This is the simplest DDE link to define and should be used to make sure the

Topic is defined correctly before using more advanced applications. Before

attempting to make the link, verify that RSLinx is running and that the DFNT

module is seen. To make a DDE link in Excel, enter the application, topic and

item elements as a formula into a cell. The format for the formula is as follows:

=APPLICATION|TOPIC!ITEM

The "|" character (piping symbol) separates the application and topic fields and

the "!" (exclamation symbol) separates the topic and item fields. For our example

topic of ProLinx1, the entry into the cell is:

=RSLinx|CIP_Sample!'RealData[500]'

This causes the current value at the database double-word offset 500 (starting at

word address 1000) in the DFNT module to be displayed in the cell as a floating-

point value. This value updates at the frequency defined in the Topic

configuration in RSLinx. You can now place any database point in the DFNT

module using the same procedure in your work sheet. Note that the tag array

name is used for the item property and must be enclosed within the quote marks.

This is because the tag array name item reference looks like an Excel work sheet

reference. If you do not include the quotes, a formula error occurs. You can

select any of the defined tag array names defined in the module on your

spreadsheet.

When the items are used for the topic, RSLinx displays the following after

selecting the Active Topic/Items command on the DDE/OPC menu option:

Any DDE compliant program can be used in the same manner. For maximum

utility Visual Basic applications can be used to interface with module’s database

using DDE connectivity.

1 2 ... 134 135 136 137 138 139 140 141 142 143 144 ... 176 177

Sem comentários

Prosoft-technology MVI46-DFNT Manual do Utilizador Página 139