Supported device types and versions
Communication line configuration
Communication station configuration
I/O tag configuration
Literature
Changes and modifications
Document revisions
Communication supports the DDE Client access using the XlTable data format (the format used by e.g. MS Excel, Wonderware Intouch I/O Servers) or CF_TEXT data format.
Communication with the DDE Server requires a separate line. There is not possible accessing several servers from one communication line.
Note: You can impersonate just an user with the logon rights Log on as a batch Job.
Table 1
Keyword | Full name | Meaning | Unit | Default value |
---|---|---|---|---|
REQ | Request | If the value is Yes, after each writing a value, there will be sent the request for backward reading the value. | YES/NO | NO |
TYPE | Server Type | Type of DDE server for communication:
|
COLD/WARM | WARM |
FORMAT | Data Format | Used data clipboard format for data transmission. | XLTABLE/TEXT | XLTABLE |
TIMEOUT | Transaction Timeout | Timeout of the function DdeClientTransaction, which determines the maximum amount of time (in miliseconds), that the DDE client will wait for a response from the DDE server in a synchronous transaction. | ms | 1000 |
Possible types: Ai, Ao, Ci, Co, Di, Do, TxtI, TxtO.
Address is the DDE Cell name (string containing up to 50 characters).
Note: If initialization of the connection to the server, topic or cell has failed, the attempt to connect is repeated in the interval of 5 seconds. It is true when the connection is lost (server shutdown etc.).
If the DDE server is installed on other PC within a local computer network, you can establish a connection via the NetDDE interface. For such a connection is valid:
It is possible using the MS Excel program. Run the MS Excel as the DDE server using the switch /e e.g. from the command prompt - excel.exe /e.
Complete access to a DDE cell is as follows:
Excel|Sheet1!”R1C1”
Where:
The naming is valid only for English versions of MS Excel.
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