Both of the major platforms Allen Bradley RSLogix 5000 and Schneider Electric Unity allow the programmer to create objects of user defined data types and functi

Both of the major platforms Allen Bradley RSLogix 5000 and Schneider Electric Unity allow the programmer to create objects of user defined data types and functions that can operate on elementary (eg float, INT) or user defined data types. They also support arrays, and arrays of objects. They also both support structured text so you can type if statements and for loops and call functions. So for at least those PLC platforms it is not exclusively visual and you can write a function once and use it many times.