Super Systems Compact HMI - Manual (Page 17)

Compact HMI and Compact HMI Editor Operations Manual
Super Systems Inc. Page 17 of 60
Please refer to Appendix 1: Software Best Practices, “When Configuring Connections and Tags
in Compact HMI Editor,” for information on best practices for configuring connections and tags
in Compact HMI Editor.
Expression Editor
The Expression Editor is used in conjunction with two Control properties: Display Expression
and Display Conditions. The Expression Editor will be displayed when Display Expression or
Display Conditions is selected (for example, from the Control Properties Grid).
NOTE: Some Display Conditions (described in more detail below) and the Expression Editor
utilize Tags.
Figure 18 - Expression Editor window
Expression Operators, Constants, and Functions
Tag names identify register locations within a data device. Each register is constituted by a word
containing 16 bits. Compact HMI Editor provides ways of evaluating values contained within data
device registers against values defined by the user. In order to program valid expressions, it is
important to understand the expression syntax used in Compact HMI.
A Tag can be called using the following syntax:
Tag(“[ConnectionName]TagName”)
where ConnectionName is the name of a defined
connection and TagName is the name of a defined Tag within that connection.
A particular bit can be called according to one of the following two syntaxes: