Schneider M580 PLC - Unity Pro8.1

Hello, I'm having difficulty program the M580 Schneider PLC (EPAC line).I need to work with matrices of two or more dimensions, eg. 2x2, 15x1 ....
I would like to program a three-dimensional interpolation block, only for that I need to use matrix in "ST" language.
Someone has managed to create a data type of matrix in Unity?

Thank you for your help!

SOLVED.

To create a matrix just select the type, as is the default, and the next button to access the options. It select the "Array" which is in the page footer and the display alongside fill with dimensions "[0..x, 0..y]" (where X and Y are the desired size.)