IEC 61850 MMS

What is IEC 61850 MMS?

IEC 61850 MMS

IEC 61850 MMS (Man­u­fac­tur­ing Mes­sage Spec­i­fi­ca­tion) is a client/server based pro­to­col for com­mu­ni­ca­tions between IEDs (IED – Intel­li­gent Elec­tron­ic Device) and high­er lev­el enti­ties (such as RTUs and SCADAs) over Ethernet.

It is part of the IEC 61850 stan­dard for com­mu­ni­ca­tion tech­nol­o­gy in sub­sta­tions and allows to access the serv­er through its IP address in order to write/read data and exchange files.

  • MMS was orig­i­nal­ly devel­oped by Gen­er­al Motors for com­mu­ni­ca­tions in auto­mat­ed man­u­fac­tur­ing systems.
  • It is defined in ISO 9506 and based on the Open Sys­tem Inter­con­nec­tion (OSI) model.
  • It pro­vides a range of func­tions that allows the client to obtain the data mod­el of the serv­er, read or mod­i­fy indi­vid­ual val­ues, delete entries as well as trans­fer files.
  • When an action is per­formed, the client sends a request to the serv­er, which process­es the request and responds to the client, also stat­ing whether the request was processed successfully.
  • The MMS pro­to­col is not only used by IEC 61850 for com­mu­ni­ca­tion in sub­sta­tions. There are sev­er­al more areas of appli­ca­tion for the MMS pro­to­col in smart grids, as for exam­ple the IEC 61400–25 stan­dard for com­mu­ni­ca­tion and mon­i­tor­ing in wind pow­er plants. or the IEC 60870–6 tele­con­trol pro­to­col, often used for com­mu­ni­ca­tion between con­trol centers.
  • The IEC 62351–4 stan­dard defines sev­er­al secu­ri­ty mea­sures to pro­tect the com­mu­ni­ca­tion via MMS in order to mit­i­gate the risks asso­ci­at­ed with the wide use of MMS in smart grids, .

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    IEC 61850

    The GOOSE (Gener­ic Object Ori­ent­ed Sub­sta­tion Event) pro­to­col is a com­mu­ni­ca­tion mod­el defined by the IEC 61850 stan­dard, which uses fast and reli­able mech­a­nisms to group any for­mat of data (sta­tus, val­ue) into a data set and trans­mit it through elec­tri­cal net­works with­in a time peri­od of 4 milliseconds.

    It is most com­mon­ly used for data exchanges between IEDs (IED – Intel­li­gent Elec­tron­ic Device) in elec­tri­cal sub­sta­tions over Ethernet.

    IEC 61850 MMS (Man­u­fac­tur­ing Mes­sage Spec­i­fi­ca­tion) is a client/server based pro­to­col for com­mu­ni­ca­tions between IEDs (IED – Intel­li­gent Elec­tron­ic Device) and high­er lev­el enti­ties (such as RTUs and SCADAs) over Eth­er­net that is part of the IEC 61850 stan­dard for com­mu­ni­ca­tion tech­nol­o­gy in substations.

    It is mapped onto TCP/IP and allows to access the serv­er through its IP address in order to write/read data and exchange files.

    The IEC 61850 stan­dard for sub­sta­tion automa­tion spec­i­fies a stan­dard­ized Substa­tion Con­fig­u­ra­tion Lan­guage (SCL) to trans­fer device descrip­tions and com­mu­ni­ca­tion para­me­ters amongst dif­fer­ent vendors/ manufacturers. 

    SCL files define sev­er­al capa­bil­i­ty sub­sets for the IED to instan­ti­ate its capabilities.

    The IED Capa­bil­i­ty Descrip­tion (ICD) file is a spe­cif­ic type of SCL file, which are the con­fig­u­ra­tion files defined by the IEC 61850 stan­dard for mod­ern sub­sta­tion automation.

    It is usu­al­ly sup­plied by man­u­fac­tur­ers and defines the full capa­bil­i­ty range of an IED.

    Log­i­cal nodes (abstract data objects) are the main ele­ments of the vir­tu­al object-ori­ent­ed IEC 61850 mod­el, which con­sists of stan­dard­ized data and data attributes.

    They can rep­re­sent switch­es in the grid, sen­sors, com­mu­ni­ca­tion inter­faces, or sim­ply con­tain descrip­tions of devices.

    IEC 61850 MMS & iGrid

    iGrid T&D has a spe­cial com­mite­ment to inter­op­er­abil­i­ty and IEC 61850 in par­tic­u­lar. For this rea­son, iGrid has devel­oped a spe­cial tool “iCon­fICD” to con­fig­ure IEC 61850 RTUs, SCADAs, I/O Exten­sion units and oth­er devices for IEC 61850 projects.

    All iGrid devices and soft­ware solu­tions sup­port the IEC 61850 MMS protocol

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    Com­pact and scal­able bay con­troller which can act as IEC 61850 client or serv­er, fea­tur­ing con­fig­urable I/O boards for direct data acqui­si­tion, high-pre­ci­sion time­stamp­ing and an option­al Eth­er­net switch for addi­tion­al Eth­er­net ports.

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