Manufacturing Message Specification
Encyclopedia
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
This version of MMS used seven layers of OSI network protocols
as its communication stack:
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
") 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.
Data
The term data refers to qualitative or quantitative attributes of a variable or set of variables. Data are typically the results of measurements and can be the basis of graphs, images, or observations of a set of variables. Data are often viewed as the lowest level of abstraction from which...
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
OSI protocols
The Open Systems Interconnection protocols are a family of information exchange standards developed jointly by the ISO and the ITU-T starting in 1977....
as its communication stack:
| Application | Association Control Service Element (ACSE)- ISO 8649/8650 |
| Presentation | Connection Oriented Presentation - ISO 8822/8823 Abstract Syntax Notation (ASN)- ISO 8824/8825 |
| Session | Connection Oriented Session - ISO 8326/8327 |
| Transport | Connection Oriented Transport - ISO 8072/8073 |
| Network | Connectionless network - ISO 8348 |
| Link | MAC - ISO 8802-3 [Ethernet] MAC - ISO 8802-4 [Token Ring] |
| Physical | Ethernet Token Ring |
MMS stack over TCP/IP
Because the Open Systems InterconnectionOpen Systems Interconnection
Open Systems Interconnection is an effort to standardize networking that was started in 1977 by the International Organization for Standardization , along with the ITU-T.-History:...
protocols are challenging to implement, the original MMS stack never became popular. In 1999, Boeing created a new version of MMS using Internet protocols
Internet protocol suite
The Internet protocol suite is the set of communications protocols used for the Internet and other similar networks. It is commonly known as TCP/IP from its most important protocols: Transmission Control Protocol and Internet Protocol , which were the first networking protocols defined in this...
instead of the bottom four layers of the original stack plus RFC 1006 ("ISO Transport over TCP
Transmission Control Protocol
The Transmission Control Protocol is one of the core protocols of the Internet Protocol Suite. TCP is one of the two original components of the suite, complementing the Internet Protocol , and therefore the entire suite is commonly referred to as TCP/IP...
") in the Transport layer. The top three layers use the same OSI protocols as before.
In terms of the seven-layer OSI model
OSI model
The Open Systems Interconnection model is a product of the Open Systems Interconnection effort at the International Organization for Standardization. It is a prescription of characterizing and standardizing the functions of a communications system in terms of abstraction layers. Similar...
, the new MMS stack looks like this:
| Application | Association Control Service Element (ACSE)- ISO 8649/8650 |
| Presentation | Connection Oriented Presentation - ISO 8822/8823 Abstract Syntax Notation (ASN)- ISO 8824/8825 |
| Session | Connection Oriented Session - ISO 8326/8327 |
| Transport | ISO transport over TCP - RFC 1006 Transmission Control Protocol (TCP) - RFC 793 |
| Network | Internet Control Message Protocol (ICMP) - RFC 792 Internet Protocol (IP)- RFC 791 Address Resolution Protocol (ARP)- RFC 826 |
| Link | IP datagrams over Ethernet - RFC 894 MAC - ISO 8802-3 [Ethernet] |
| Physical | Ethernet |
With the new stack, MMS has become a globally accepted standard.