Delta RMC151 - Manual (Page 349)

5 Programming
REAL[20] array with the index 4. This is
actually the fifth element
because the indices are zero-
based.
MyArray as
REAL[10]
Myindex as DINT
MyArray[MyIndex] The value of 'Myindex' specifies
the element in 'MyArray'.
MyArray as
DINT[5]
MyVar as REAL
MyArray[ REAL_TO_DINT
(MyVar +5.0) ]
If you wish to use a REAL value
as an index, you can convert it
to a DINT as illustrated here.
_VarTbl.CurVal[2] You can index variables as
shown here, but it is much
better to first assign a tag
name to a variable, then use
the tag name, as shown in the
MyArray example above.
_Axis[0] Specifies the first axis. Note
that '_Axis[0]' is not a valid
data type by itself. You must
specify a tag, such as
_Axis[0].ActPos.
i as DINT _Axis[i+2] An index can be an expression,
but must evaluate to a DINT.
Special Case: _Axis[] with no specified element
In the user programs, the "_Axis[]" tag can be used without any value in the brackets. In
this case, the default axis of the task that is running the user program will be used. This
is for advanced users only. See the Default Axis section of the Tasks topic for details.
Special Case: _Task[] with no specified element
In the user programs, the "_Task[]" tag can be used without any value in the brackets. In
this case, the task that is running that user program will be used. This is for advanced
users only.
For example, you can use _Task[].CurAxis to change the default axis of the task.
Using Variable Arrays
Many types of data in the RMC are already in the form of arrays, such as axes, tasks, and
variables. In addition, you can declare arrays in the Variable Table Editor.
Variable arrays are useful for storing data that needs to be used sequentially. Using
arrays can make user programs shorter and easier to read. For example, if your
application requires sequentially moving to a number of positions, you can store those
positions in an array. You can then create a loop in a user program to move to each
position. You can increment an index variable each loop to specify which position to move
to.
Declaring Variable Arrays
To declare an array in the variable table:
1. Open the Variable Table Editor.
2. On the Edit tab, click the Type cell for some variable, then click the ellipsis button (
).
3. Choose the Data Type and the Size of the array, then click OK.
4. For each element in the array, you can set the initial value in the same manner as for
any variable.
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