This paper reports the development of an automatic programmable controller programming system prototype. This windows-based system uses the concept of an object-oriented paradigm to specify the control logic. This object-oriented specification is automatically translated to a specific programmable controller programming language. Actually, the system can automatically generate a subset of the PLC5 programming language. Through this type of system, productivity of the programming activity is increased, specifically in environments where a large number of different programmable controllers coexist. Portability of the developed control software is also guaranteed, because a common description can be translated to different formats. The system is being written using Pascal with Objects and Arity PROLOG. >