Technical Reference Manual - InduSoft

Communication with Other Devices
A new OPC .Net Client worksheet is displayed:
OPC .Net Client worksheet
2. In the Description box, type a description of the worksheet. This is for documentation purposes only and
does not affect the execution of the worksheet.
3. In the Connection list, select the OPC Server connection that you configured earlier.
4. For more connection options, click Advanced.
The Advanced dialog is displayed:
Review the options and configure as needed:
Area / Element
Read actions
Enable subscription
Description
When this value is TRUE (non-zero), the client will constantly request updates from the server.
Note: This is enabled by default. If it is disabled, then you must use a read trigger (see
below).
Maximum group size
Synchronous read
trigger
The maximum number of tag reads that may be performed in a single read operation.
For example, if you have 1000 items/rows configured in the worksheet and Maximum group size is set
to 100, then 10 read operations will be performed during each scan of the worksheet.
When the value of this tag/expression changes, the worksheet is scanned and all tag values are read
from the server. The project waits for the scan to complete before continuing.
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