Study of PLCopen motion block′s parameter passing

LUO Lin-dan, BAO Jian

(College of Computer, Hangzhou Dianzi University, Hangzhou 310018, China)

Abstract: Aiming at the problems of parameter passing in PLCopen motion control specification′s implementation, the types, independence and discontinuity of parameters in PLCopen motion control specification and the IEC61131-3 standard programming norms were studied. Two methods called IL passing method and parameter template structure method were proposed. IL instructions were used by the first method to transfer parameters, and static function library was used to implement blocks.The parameter template was used by the second method to generate the definition and feedback of parameters dynamically, and dynamical function library was used to implement blocks. Different from traditional methods of passing value or reference based on C language or other senior language, the IEC61131-3 standard programming norms were supported and PLC available memory was reduced. Comparison and analysis were done and the results indicate that two methods can achieve PLCopen motion control specification, and each has advantages satisfy varied requirements.

Key words: motion control block; component; IL instructions; parameters template