This paper presents an application of object-oriented methodology to the development of Programmable Logic Controller (PLC) programs. PLC is widely used as computer controller of manufacturing machinery, principally because its robustness and programming simplicity. During the last years, IEC 61131-3 norm has been introduced aiming to provide standard languages and structure to the development environments of PLC programmes, that are instead strictly bound up to now to proprietary languages. Following IEC 61131-3 prescription, is it also possible to develop well structured, object-oriented control software, which was hardly possible with the former vendor-specific low-level languages. This paper describes an application of the novel standard IEC 61131-3 to the development of the control software of a medium complexity manufacturing machinery. Software development methodology is reported and comparison regarding development time, software re-usability and application structuring, is the...
Object-oriented approach to PLC software design for a manufacture machinery using IEC 61131-3 norm languages
BONFE', Marcello;
2001
Abstract
This paper presents an application of object-oriented methodology to the development of Programmable Logic Controller (PLC) programs. PLC is widely used as computer controller of manufacturing machinery, principally because its robustness and programming simplicity. During the last years, IEC 61131-3 norm has been introduced aiming to provide standard languages and structure to the development environments of PLC programmes, that are instead strictly bound up to now to proprietary languages. Following IEC 61131-3 prescription, is it also possible to develop well structured, object-oriented control software, which was hardly possible with the former vendor-specific low-level languages. This paper describes an application of the novel standard IEC 61131-3 to the development of the control software of a medium complexity manufacturing machinery. Software development methodology is reported and comparison regarding development time, software re-usability and application structuring, is the...I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
