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Displays
For more information, see the topic 'Display scripting reference' in the HMIWeb Display
Building Guide.
Display design
When designing custom displays, you should determine:
The purpose of each display from an operator's point-of-view
n
How operators will navigate from one display to another (For example, you could have
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a 'home' display, showing the entire plant, with a set of buttons to link to other displays
that show specific assets or processes.)
The security requirements of each display (You can use assignable assets to restrict
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access of a custom display to operators or Stations that have been assigned a specific
asset.)
You should present information in an appropriate form, so that it is intuitive and easy to use.
Also, consider using a presentation style similar to that used in the system displays, so that
operators are not confronted with two presentation styles.
Display security
The data that can be viewed with a system display is primarily controlled by assigning to
operators (or Stations) the assets that contain the data. Values can be seen if the asset
permissions is View or higher. Values can be changed if the access is Oper or higher.
With custom displays, however, the security needs to be configured on the display itself.
There are two ways to achieve this:
A display may be assigned to an asset, so that the operator has to have View access to
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that asset in order to call up the display.
An individual database link can have data entry permissions set. Data entry can be
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totally prevented; that is, the field is read-only, or a security level may be applied, allow-
ing an operator with lower level to see the data, but not modify it. (This technique is
also used on many system displays to restrict data entry to Admin level only.)
Acronyms
An acronym describes the meaning of a parameter's state (or integer value). For example, the
acronyms 'Stopped' and 'Running' are more meaningful in displays than the raw parameter
values '0' and '1'.
Experion includes a comprehensive collection of acronyms that are suitable for most purposes
(Open/Closed, Manual/Automatic, and so on). However, you can create your own acronyms
if needed.
Honeywell 2017
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