Manufacturing Message Specification (MMS) is an international standard (
ISO 9506) dealing with messaging systems for transferring real time process
data and supervisory control information between networked devices 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
Virtual may refer to:
* Virtual (horse), a thoroughbred racehorse
* Virtual channel, a channel designation which differs from that of the actual radio channel (or range of frequencies) on which the signal travels
* Virtual function, a programming ...
(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 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:
MMS stack over TCP/IP
Because the
Open Systems Interconnection protocols are challenging to implement, the original MMS stack never became popular. In 1999, Boeing created a new version of MMS using
Internet protocols instead of the bottom four layers of the original stack plus RFC 1006 ("ISO Transport over
TCP
TCP may refer to:
Science and technology
* Transformer coupled plasma
* Tool Center Point, see Robot end effector
Computing
* Transmission Control Protocol, a fundamental Internet standard
* Telephony control protocol, a Bluetooth communication s ...
") in the transport layer. The top three layers use the same OSI protocols as before.
In terms of the seven-layer
OSI model, the new MMS stack looks like this:
With the new stack, MMS has become a globally accepted standard.
External links
MMS Protocol DetailsMMS OverviewMMS V1 Abstract Syntax* MMS Protocol Description
* MMS. Presentation by Prof. Dr. H. Kirrmann, ABB Research Center, Baden, Switzerland
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ISO standards