Technical Reference Manual - InduSoft

Communication with Other Devices
Area / Element
Description
Write actions
Asynchronous read
trigger
Read count
Status
Status message
Maximum aging
Enable write on tag
change
N/A for OPC .Net Client.
The name of a tag (Integer type) that will receive a count of the number of read operations performed
since the project was run.
The name of a tag (Integer type) that will receive a status code for the last read operation performed by
a trigger.
The name of a tag (String type) that will receive the corresponding status message.
N/A for OPC .Net Client.
When this value is TRUE (non-zero), a write will be automatically performed whenever the value of the
project tag changes.
Note: This is enabled by default. If it is disabled, then you must use a write trigger (see
below).
Reload trigger
Refresh IDs on startup
Enable bit notation
Maximum group size
Synchronous write
trigger
Asynchronous write
trigger
Write count
Status
Status message
The maximum number of tag writes to be performed in a single write operation.
For example, if you have 1000 items/rows configured in the worksheet and Maximum group size is set
to 100, then 10 write 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 written
to the server. The project waits for the scan to complete before continuing.
N/A for OPC .Net Client.
The name of a tag (Integer type) that will receive a count of the number of write operations performed
since the project was run.
The name of a tag (Integer type) that will receive a status code for the last write operation performed by
a trigger.
The name of a tag (String type) that will receive the corresponding status message.
Indirect tags (e.g., {MyTag}) configured in the body of the worksheet will be reloaded only when the
value of this tag/expression changes.
N/A for OPC .Net Client.
When this option is selected, bit notation is allowed in the Item column of the worksheet body.
5. Click OK to close the Advanced dialog and return to the worksheet.
6. In the Status box, type the name of a tag (Integer type) that will receive connection status codes during
project runtime.
7. In the Status Message box, type the name of a tag (String type) that will receive the corresponding status
messages.
8. In the Publish Rate box, type the frequency (in milliseconds) at which the client will request updates from the
server.
9. In the Disable box, type a tag/expression. When the value is TRUE (non-zero), the worksheet will not be
executed.
10.In the Root node or view box, specify the server node that will serve as the root for all items in the worksheet
body. Specifying a root node makes it easier to find items and improves runtime performance.
11.For each row of the worksheet body, specify the following:
• Tag Name: The name of a project tag.
You may use indirect tags (e.g., {MyTag}), but if you do, then be sure to configure the Reload trigger
option above.
• Item: The server item with which the project tag should be associated.
To browse the server's list of items, right-click in this field and then click Browse on the shortcut menu.
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