Open metering system
The Open Metering System (OMS) stands for a cross-manufacturer and cross-sector communication architecture for intelligent meters based on the M-Bus (fieldbus) in the context of smart metering . It is the only system definition worldwide that integrates all media (electricity, gas, heat and water including submetering) in one system.
background
On the basis of Directive 2006/32 / EC on energy end-use efficiency and energy services (in particular Article 13 of the Directive), several German cross-network companies (i.e. suppliers that offer several sectors such as electricity, gas, water or district heating) have come together and the manufacturers of corresponding measuring devices asked to implement a uniform standard. The aim should be that the measuring devices have uniform communication interfaces. On the manufacturer side , members of the FIGAWA , KNX and ZVEI associations have come together and, based on the M-Bus standard (DIN EN 13757 Part 1 to Part 6) and the Dutch NTA 8130, have made joint specifications that guarantee manufacturer-independent interoperability.
The Open Metering System Specification
Since May 2007, several working groups of the Open Metering Initiative have examined the application of existing standards for interoperable communication between metering systems and developed additions and specifications. For the data transmission between the actual meters and the gateway (e.g. MUC) defined as primary communication, EN 13757-x was identified as the currently applicable standard. This series of standards describes the M-Bus as a physical interface, wired and wireless, as well as the data protocol. Both the OMS specification and the KNX standard use the EN 13757-4 standard for wireless communication . This means that both measurement data and data from the field of building automation can be transferred via the same system.
Remote communication is solved with proven Internet standards, whereby the transmission should be independent of the physical medium as long as the necessary security mechanisms are observed.
For data visualization (consumption display), the connection of the building automation at the end customer and for future services such as B. Tariff or load management devices are used that work according to the popular KNX standard (ISO / IEC 14543-3 = EN 50090).
In the specification work, international concerns were also taken into account, because on the basis of mandate M / 441 of the European Commission, smart metering is to function with an open architecture, including communication protocols that enable interoperability. For this purpose, we cooperated with KEMA for harmonization with the Dutch regulations NTA 8130 / DSMR .
The requirements for data security and access protection were taken into account as a decisive prerequisite for the acceptance of intelligent measuring systems. A device-specific encryption of the consumption data on the basis of common algorithms is part of the OMS specification. In its BSI TR-03109, the Federal Office for Information Security (BSI) expressly refers to the OMS specification as one of the permissible interfaces in the Local Metrological Network (LMN).
The Open Metering System Group has already initiated the next steps for the implementation of the standard: A neutral body will set a binding certification in order to ensure the compatibility of all devices according to the OMS specification in practice.
standardization
Since 2009, the work of the OMS has been brought into the Technical Committee CEN / TC 294, which maintains the EN 13757 series of standards. This means that essential components of the OMS specification have been incorporated into updated European standards. This process will continue in the future. The standards or the published draft standards are available to everyone for purchase.
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