Panasonic HMWIN User Manual page 164

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number of data transfers defined in the Data Transfer editor

number of data transfers eventually occurring at the same time
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frequency of the changes of the plc's variables that are monitored
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Number and size of features used in the project (i.e. tags, Alarms, Trends...). Always test
performance of operation during project development.

If inappropriately set, data transfer tasks can lead to conditions where the tags involved
create loops. Identify and avoid such conditions.

Using the "OnUpdate" mode of the Data Transfer you force the system to continuously read all the
defined source tags to check if there are changes that need to be transferred. Consider to reduce
the update rate of the source tags that need to be checked. The default value of the update rate of
each tag is 500 mSec and can be modified from the tag editor using the advanced view. To use two
different rates for data transfer & Pages, tags can be defined two times in tag editor, one for pages
and another for data transfers.

Data Transfer configured using the OnTrigger mode is preferred over the OnUpdate mode because
you have the possibility to force the Data Transfer based on your needs. You can use the scheduler
to calibrate the update rate based on the performance of your entire application. Also using
OnTrigger system is monitoring just trigger tag and not all tags to transfer.

Using tags of type array allows server engine to optimize data transfer and reduce workload.

Too many Data Transfers can introduce side effects on page change time and on boot time.
ACGM0195V1EN
HMWIN Studio User Manual
164