Object Oriented Design in Industrial Automation

Object Oriented Programming (OOP)  is supported by many PC programming languages.

How about PLC programming systems? Do you think that object oriented programming is possible for industrial automation systems?

Some automation gurus say that 'object oriented programming is for only programs, an automation system is not a program; may have a program but it is not a program, it is not a desktop application. So automation systems can not be object oriented'

And some gurus say that 'we are already designing in object oriented for many years, before it applied to PC programming'

What do you think?

I will be glad if you write some comments before starting a new post series. Should I define and describe the basics of object oriented design? Or directly run in to a case study of 'object oriented design in an automation system?'