Delta RMC151 - Manual (Page 323)

5 Programming
Expressions
The Expression command makes the User Programs very powerful. The Expression (113)
command can only be used in User Programs. It can be used for mathematical
calculations and to assign values to tags or variables.
There is no limit to the number of Expression commands that can be issued per step in
the User Programs.
Local variables can be declared in a step. These variables can only be accessed within the
step and are not retained after the user program jumps to another step, even if it is to
the same step. Local variables can be used in an expression command, in command
parameters, or in link conditions.
Importing and Exporting User Programs
User Programs can be exported to a file to be imported later into another project. When
exporting a User Program, all the variables and tags it uses are included. When importing
the User Program, a dialog guides you in assigning the variables and tags to the new
project.
See the Exporting and Importing User Programs for details.
If you simply wish to copy a User Program from one project into another without
including the variables and tags, you can use standard copy and paste functions.
Disabling User Programs
User programs can be disabled. Disabled user programs will be downloaded to the RMC,
but will not be able to be run. Disabling user programs is useful if you want to keep a
user program in the project for reference or later use even if it has errors.
To enable or disable a user program, right-click the program in the project pane and
choose Disable program or Enable program. You can also use the Programming
Properties dialog to disable and enable programs.
5.11.2. Creating User Programs
Follow the steps below to create a User Program. For example user programs, see the
Programming Examples Overview topic.
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