Delta RMC151 - Manual (Page 344)

RMC70/150 and RMCTools User Manual
• In the Tags box, find the desired register and double click it. It will be placed
in Expression box. Then, in the Operators box, double-click the assignment
operator (:=). It will also be placed in Expression box.
Note:
You can also type the information directly in the Assignment Expression
box.
Local Variables:
If your expression needs temporary variables, you can declare variables in the user
program step. See Local Variables for details.
3. Complete the expression:
• Double-click any item in the lists on the Tags, Functions or Operators tabs
to insert into the expression.
• Type other items, such as register addresses or numeric values.
• To mix data types, you must explicitly convert them. For example, you cannot
directly assign a fractional value to an integer variable. You must use the data
type conversion functions.
• If you enter multiple expressions in the Expression command, each expression
must end with a semi-colon. See the examples above.
• If the expression is invalid, the Expression Builder give an error. When no
errors are listed, the expression is valid.
4. Click OK to close the dialog and enter the expression in the command.
5.13.3. Condition Expressions
Condition expressions are used in the Condition box of a Program Trigger item, and in the
Wait For and Conditional Jump link types. A condition expression must evaluate to True or
False.
Simple condition expressions can also be entered with the New Condition Wizard.
Sample Expressions
1. _Axis[0].Status.InPos = True //checks if the in Axis 0 Status Bit
named "In Position " is on.
2. _Axis[1].ActPos < 4.0 AND MyInput = True
3.
_Axis[0].ActPos > Pos1 AND _Axis[1].ActPos < 4.0
4.
MyVariable + SQRT (_ Axis[1].ActPrs ) >= 12900.1
5.
counter >= 300
Entering an Expression
Using a Wizard
In the Condition box of a Program Trigger or a link type, click the ellipsis button . The
New Condition Wizard will open. Use the wizard to create the following types of
expressions:
• Test a Status bit, such as the In Position bit.
• Test and Error bit, such as the Fault Input bit.
324 Delta Computer Systems, Inc.