D 5.12 'Write Variable' Operation - ABB Freelance 2000 Manual

Section D
highest priority message
newest message
oldest message

D 5.12 'Write variable' operation

After a process variable is specified for writing to by a DigiVis operation action, the type of
operation and associated operations log entry format must be specified. The value to be written
to the variable is either fixed as a configuration setting or to be entered by the DigiVis user. The
same dialogs are available for user entry of a value as are used for operating a tag allocation
faceplate:
• Values for variable of all data types except BOOL can be obtained with an input field or a
scroll bar.
• Values for all data types except REAL can be obtained from the user with fields of up to 6
radio buttons.
Values for structured variables can also be obtained via a graphic display. The operation of
each component of a structured variable is configured separately. In DigiVis the operation of
the components is carried out one after another. Not all components need participate in the
operation procedure.
After a graphic object is selected in DigiVis, a dialog is displayed on the bottom of the screen.
When the operation dialog is called up, the current value of the process variable to operate is
read and displayed as default value. For a description of the DigiVis user input dialog, see the
Operators Manual, Operator Station, Operating Philosophy.
Only one operation procedure can be configured on a graphic display for a given process
variable. It is not possible, for example, to configure one graphic object with an input field and
another graphic object with radio buttons to operate the same variable in the same graphic
display.
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D-40
All messages being equally important according to Criteria A and B are
sorted according to
Criterion C: Acknowledgment strategy.
Step 1 Acknowledgment strategy 1
Step 2 Acknowledgment strategy 2
Step 3 Acknowledgment strategy 3
From all messages being equally important according to Criteria A, B, and
C the oldest message will be determined.
The message with the highest priority. If more than one message with the
same priority exists, the 'most important' will be determined.
The message with the most recent time stamp. If more than one message
with the same priority exists, the 'most important' will be determined.
The unacknowledged message with the time stamp furthest in the past. If
more than one message with the same priority exists, the 'most important'
will be determined.
Graphic Display