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Manufacturing Message Specification (MMS) is an international standard (ISO 9506) dealing with messaging system for transferring real time process data and supervisory control information between networked devices and/or computer applications. The standard is developed and maintained by the ISO Technical Committee 184 (TC184). MMS defines the following * A set of ''standard objects'' which must exist in every device, on which operations like read, write, event signaling etc. can be executed. Virtual manufacturing device (VMD) is the main object and all other objects like variables, domains, journals, files etc. comes under VMD. * A set of ''standard messages'' exchanged between a client and a server stations for the purpose of monitoring and/or controlling these objects. * A set of ''encoding rules'' for mapping these messages to bits and bytes when transmitted. == MMS original communication stack == MMS was standardized in 1990 under two separate standards as # ISO/IEC 9506-1 (2003): Industrial Automation systems - Manufacturing Message Specification - Part 1: Service Definition # ISO/IEC 9506-2 (2003): Industrial Automation systems - Manufacturing Message Specification - Part 2: Protocol Specification This version of MMS used seven layers of OSI network protocols as its communication stack: 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Manufacturing Message Specification」の詳細全文を読む スポンサード リンク
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