Open Metering System
The Open Metering System (OMS ) is a vendor-and interdisciplinary communication architecture for smart meters based on the M-Bus as part of the smart metering. It is the only system definition that integrates all media (electricity, gas, heat and water, including submetering ) to a system in the world.
Background
On the basis of Directive 2006/32/EC of the European Parliament and of the Council of 5 April 2006 on energy end use efficiency and energy services (in particular, Article 13 of the Directive) have several German multi-utility companies (ie catering, which multiple lines of business, such as electricity, gas water or district heating offer ) teamed up and the manufacturer of such instruments asked to implement a uniform standard. The aim should be that the measuring instruments have standardized communication interfaces. On the manufacturing side i W. members of the associations FIGAWA, KNX and ZVEI got together and based on the M-Bus standard (DIN EN 13757 part 1 to part 6) taken as well as the Dutch NTA 8130 common provisions which, a cross-manufacturer interoperability guarantee.
The Open Metering System Specification
Several working groups of the Open Metering initiative since May 2007, the use of existing standards for an interoperable communication of measurement systems tested and developed amendments and specifications. For the defined as the primary communication data transmission between the actual meters and the gateway ( eg MUC ) EN 13757 -x was identified as currently applicable standard. This series of standards describes the M-Bus interface both as a physical, wired and wireless, as well as the data protocol. For wireless communications use both the OMS specification and the KNX standard, the standard EN 13757-4. Thus both measurement data and data from the field of building automation can be transmitted via the same system.
The remote communication is achieved with proven Internet standards, the transfer should be independent of the physical medium, provided the necessary Sichheitsmechanismen be respected.
For data visualization ( fuel gauge ), the connection of the building automation to the end customer, and for future services such as tariff and load management devices are used, which according to the widely KNX standard (ISO / IEC 14543-3 = EN 50090 ) working.
In the specification work, international interests were taken into account, because on the basis of the mandate M/441 of the European Commission is to function enabling communication protocols, the Smart Metering with an open architecture involving interoperability. For this purpose, cooperating to harmonize with the Dutch rules NTA 8130/DSMR with KEMA.
As a crucial prerequisite for the acceptance of intelligent metering systems that requirements were taken into account for data security and access protection. A device-specific encryption consumption data based on common algorithms is part of the OMS Specification. The BSI ( Federal Office for Security in Information Technology ) refers in his TR- 03109 explicitly to the OMS specification as one of the allowed interfaces in LMN (Local Metrological Network).
The Open Metering System Group has already initiated the next steps for the implementation of the standards: a neutral body will set a mandatory certification to ensure the compatibility of all devices of the OMS specification in practice.
Standardization
The work of the OMS are introduced since 2009 in the Technical Committee CEN / TC 294, which is the standard series EN 13757 cultivates. This essential components of the OMS specification have been incorporated into revised European standards. This process will be continued in the future. The standards and the published draft standards available to everyone available for purchase.