Moore Industries NET Concentrator System AOM, Руководство пользователя

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NET Concentrator System
®
NCS
- 30 -
Moore Industries-International, Inc.
www.miinet.com
Retain Variables
Variables marked as “retained” in the dictionary
are saved at the end of each execution cycle. This
feature is useful to store operating modes, settings
and PID tuning constants across NCS power cycles.
Stored data is identified by the programmer assigned
Resource Number. When a resource starts up, it
attempts to restore the retain variables. If they are not
found, or the data does not match, an error bit will be
set. Also, if there is no room to store the retain data,
an error will be set.
Removing Resources
To remove a resource from an Interface Module, you
must FTP into the unit and delete all of the contents
of the hds folder. This will prevent the resource(s)
from being started when the Configuration Manager
Service attempts to locate them, but will not remove
any already loaded into memory. To do this, ISaGRAF
must be either stopped and restarted, or the Interface
Module rebooted.
ISaGRAF Web Page
The ISaGRAF web page shows the execution status
of ISaGRAF, including if it is running or stopped,
and any errors. Clicking the Stop button will cause
resource execution to be stopped, and the entire
ISaGRAF subsystem to be shut down. Clicking the
Start Button causes the ISaGRAF services to be
restarted.
The “Clear Retain Variables” button
The NCS will never delete retain variables, except in
response to this button being clicked. However it will
overwrite data if the resource number matches. As
a result, if a resource is deleted from the system, it’s
retain data may be left behind. Then if a resource
with a different number is downloaded, there may not
be enough room for the retain variables. Clearing the
Retain Variables removes this left over data, making
room for the new data.