This dialog appears if you choose to view or edit the properties of an existing equipment specification variable, or if you choose to create a new equipment specification variable, through the Specification Variables Databank Dialog.
This dialog allows you to view or edit the properties of an equipment specification variable. These include the Name, Type and Default value of the variable. A variable can take one of the following specification types:
● Numerical
The numerical specification type can be described by the units, the number of decimal points, a default value and a minimum and/or maximum value if required.
● Range
The range specification type can be described by the units the number of decimal pints the default range of values and the minimum and/or maximum value if required.
● Boolean
The boolean specification type can take one value either true or false.
● Text
This specification type can take a string value up to 32 characters long.
● Selection
A selection can take different options from which a value can be chosen. Options may be added to the list and then the default can be selected from the drop down list box. (e.g. the specification variable Color which can take as options different color descriptions: blue, red, green orange etc)
Depending on the calling interface, you might not be allowed to edit all the above data. Typically, the Name and Type of the variable can only be changed when interacting directly with the ‘User’ database. Even in that case, though, the variable type cannot be changed if it creates conflicts with registered site equipment or vendor equipment that already use this variable as part of their description. You will have first to remove it from the specification list of all equipment and then change its type or delete it. Any other change in the specification variable databank will have no effect in existing process files.
See Also:
● Specification Variables Databank