InduSoft Web Studio - InduSoft Corporation

InduSoft Web Studio
Tutorial training – Revision B – Sep/10/2000
© Copyright InduSoft Ltd. 2000
Increase read priority
If it's a reading sheet, and there's more reading sheets with the same read trigger or enabled when
idle, and a write event happens, the sheet with the priority increased will be the first one on the
next reading called by the read trigger or the "read when idle" event.
Read Trigger
This field can contain a tag that will generate a read event always when changed its value.
Enable Read When Idle
This field can contain a tag or a value that will enable the continuous reading, always when its
value is greater than zero.
Read Completed
This field can contain a tag that will have its value toggled when a reading event has been
finished.
Read Status
This field can contain a tag that will have its value filled with an integer value, always when a
reading event has been finished. If this value is equal to zero, the event has been Ok. Otherwise,
the event has finished in error. The errors message can be viewed at the Logwin module (when in
NT/2000), or checked at the MODBU.MSG file, in the DRV InduSoft Web Studio's directory.
Write Trigger
This field can contain a tag that will generate a write event of the whole spreadsheet, always
when changed its value. Here we have an extremely important point: when using this feature, the
driver will write the TAGs value in the PLCs memory. This operation writes using blocks, from
the first sheet operator up to the last. If there's an operator that has not been declared in such
spreadsheet, and its address is between the first and the last, it will receive the value zero.
Therefore, be sure about what do you want to write when using this trigger, and check out
whether there's any kind of hole in the spreadsheet, that could bring any problem to the system or
to the PLC's program.
Enable Write on Tag Change
This field can contain a tag that, when its value is greater than zero, enables the writing of only
the changed tag of the body's spreadsheet, different then the write trigger.
Write Complete
This field can contain a tag that will have its value toggled when a writing event has been
finished.
Write Status:
This field can contain a tag that will have its value filled with an integer value, always when a
reading event has been finished. If this value is equal to zero, the event has been Ok. Otherwise,
the event has finished in error. The errors message can be viewed at the Logwin module (when in
NT/2000), or checked at the OMPLC.MSG file, in the DRV InduSoft Web Studio's directory.
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