Prosoft-technology MVI71-DFNT Manual de usuario descargar pdf (Pagina 137)

MVI71-DFNT ♦ PLC 5 Reference

EtherNet/IP Client/Server Communication Module User Manual

ProSoft Technology, Inc. Page 137 of 175

February 3, 2011

This section discusses setting up a DDE connection to the module in order to

transfer data between the module and a DDE compliant application.

DDE Connection

Each DDE connection requires three basic elements: Application, Topic and

Item. These three properties of a DDE link define the program providing the

connection, the topic to connect to and the item in the topic that you wish to

interface. All three are required for a connection. For this discussion, the

Application will always be RSLinx. The Topic is defined in the RSLinx OEM

release software and the Item is defined in the DDE client application where the

data is required. The link between the DDE server and the DDE client can be

established after these parameters are defined. The following illustration shows

the relationship of these elements and the facilities used in the DDE link.

1 The DDE Client application specifies the DDE link by specifying the

APPLICATION, TOPIC, and ITEM elements. For example, in Excel, enter

=RSLINX|CIP_Sample! 'ReadData[0]' into a cell.

2 RSLinx is the DDE Server: APPLICATION = RSLINX.

And

RSLinx defines the TOPIC.

This is the communication link to the DFNT module. In this example, a DDE

TOPIC is called "CIP_Sample" for the communication link to the DFNT

module.

3 The DFNT module is used to serve data to RSLinx using the EtherNet/IP

driver with explicit messaging. Database is accessed using tag names (e.g.

ReadData[0]).

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Prosoft-technology MVI71-DFNT Manual de usuario Pagina 137