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212 C1553M-B (4/05)
ADD A NEW TIMER
1. Navigate the Object Browser to [project name] > Timers. Double-click <Add New Timer> in the right pane, or right-click Timers in the left
pane and select Add New from the pop-up menu. The Add New Timer dialog box opens.
Figure 235. Add New Timer Dialog Box
2. Name: Type a unique name for the timer you want to add. Timer names are at most 50 characters long and can include any letter, digit or
special character, with the exception of single and double quotation marks. Timer names are not case sensitive. A tag resembling the timer
name appears in the Script Tag box. If the timer name contains special characters, they are omitted from the tag. Spaces are replaced with
underscores. Leading digits are removed.
3. Script tag: If you do not want to use the script tag provided by the server, type a unique, meaningful tag. Script tags are, at most, 50
characters long. They can include any letter, digit or the underscore character, but cannot begin with a digit. They cannot contain spaces or
special characters. Tags are not case sensitive. Use the script tag to refer to the timer in scripts and expressions. For a list of timer
properties that can be scripted, refer to Scripts and Expressions - Properties of Objects.
4. Expression: Type the expression that will start the timer when it becomes true and reset the timer when it becomes false. If the
expression is too long for the box, open the expression editor by clicking the expression editor button . This provides you with a larger
window to work in.
Or you can use the expression wizard to create the timer expression by clicking the Wizard button .
Refer to Scripts and Expressions for information on the syntax of expressions.
5. Delay value: In the “Enable timer output after _ seconds box,” type in the number of seconds for the timer to count down. The delay value
must be between 0.1 of a second and 86,400 seconds (24 hours).
6. Click OK. The Add New Timer dialog box closes and the new timer is created. The name of the new timer appears in the Object Browser.