Point attributes
ADM003GVAE1005 87
Manual input
The Manual data source is used when the operator needs to change the value
manually. This task is accomplished by issuing Operator Commands in the
Operate program where the operator can type in new data or select a command.
When this data source is selected, a SET button appears next to the database
point variable (for example, level) in the Tank Detail. In the Point Monitor display, a
modify button appears.
Entering an Operator Command sends the command directly to the
FMDataManager. FMDataManager immediately processes an Operator command
and issues the command to the appropriate destination based on point
configuration.
Operator Command requests are checked against the permissions assigned to
the User Group. If the command cannot be completed due to security or other
reasons, the system displays an operator message window describing why the
command is disallowed.
CommManager
The Comm option enables the user to connect to an external field device.
Depending on the point data format and variable type, only some points can be
assigned to the I/O connections. After selecting the Comm option, the
Communications Interface Configuration dialog box appears. This dialog box lists
all the interfaces available on the selected system.
Once an interface is selected, the user clicks I/O Point to view the I/O
connections. Only I/O connections compatible with the point data format and
engineering units configuration are displayed.
For more details on Comm connections, see the Communications section of this
manual.
Calculated value
This option defines that FuelsManager should calculate this value. This option is
only available for tank point variables that can be calculated (i.e. volume, mass
etc.).It is not available for variables that must be measured or manually entered
(i.e. Level or Temperature).
Local input
This data source option defines the value to be connected to another database
point and is only available for the Tank Point variable - Ambient Temperature.
OPC
The OPC option also allows the user to connect to an external field device, via a
Varec or third-party OPC server. The Hierarchy of tags available depends on the
OPC server selected. After selecting the OPC option, the OPC Server Source
select Dialog box appears.
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