Manufacturing Message Specification

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 (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

  1. ISO/IEC 9506-1 (2003): Industrial Automation systems - Manufacturing Message Specification - Part 1: Service Definition
  2. 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:

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 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") 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:

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.

External links

Generic Substation Events

Generic Substation Events (GSE) is a control model defined as per IEC 61850 which provides a fast and reliable mechanism of transferring event data over entire electrical substation networks. When implemented, this model ensures the same event message is received by multiple physical devices using multicast or broadcast services. The GSE control model is further subdivided into GOOSE (Generic Object Oriented Substation Events) and GSSE (Generic Substation State Events).

IEC 60870-6

IEC 60870 part 6 is one of the IEC 60870 set of standards which define systems used for telecontrol (supervisory control and data acquisition) in electrical engineering and power system automation applications. The IEC Technical Committee 57 (Working Group 03) have developed part 6 to provide a communication profile for sending basic telecontrol messages between two systems which is compatible with ISO standards and ITU-T recommendations.

IEC 61850

IEC 61850 is an international standard defining communication protocols for intelligent electronic devices at electrical substations. It is a part of the International Electrotechnical Commission's (IEC) Technical Committee 57 reference architecture for electric power systems. The abstract data models defined in IEC 61850 can be mapped to a number of protocols. Current mappings in the standard are to MMS (Manufacturing Message Specification), GOOSE (Generic Object Oriented Substation Event), SMV (Sampled Measured Values), and soon to Web Services. These protocols can run over TCP/IP networks or substation LANs using high speed switched Ethernet to obtain the necessary response times below four milliseconds for protective relaying.

List of International Organization for Standardization standards, 9000-9999

This is a list of published International Organization for Standardization (ISO) standards and other deliverables. For a complete and up-to-date list of all the ISO standards, see the ISO catalogue.The standards are protected by copyright and most of them must be purchased. However, about 300 of the standards produced by ISO and IEC's Joint Technical Committee 1 (JTC1) have been made freely and publicly available.

ISO standards by standard number
1–9999
10000–19999
20000+

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