Manufacturing Message Specification is an international standard 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. 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 is the main object and all other objects like variables, domains, journals, files etc. comes under VMD.
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