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The following diagram shows the power limit module (ic-pwlm) that reuses the data-point concept from the ic-data module. The ic-pwlm module also reuses the device and state concepts from SAREF, extending the `saref:State` class with additional states needed by the InterConnect pilots for the power limit use case, namely `ic-pwlm:PowerLimitState` and `ic-pwlm:FailsafeState`.
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A power limit (`ic-pwlm:PowerLimit`) is defined as the maximum value for power consumption and/or production that must not be exceeded by e.g. a (group of) device(s), a building, or also a district. The value of a power limit is expressed using a `ic-data:DataPoint`. Optionally, the limit may come with a time period of validity based on duration (`time:Duration`). This is e.g. used for grid congestion management. Additional constraints may apply, such as that premises may be subject to a contractual limitation to power consumed and/or produced. Moreover, a device may have nominal power consumption and/or production values (`ic-pwlm:NominalPowerLimit`) that are defined by the manufacturer and must not be exceeded, so that the power limit must stay within these constraints. A device must acknowledge (ACK) a received power limit. A power limit is associated with a state (`ic-pwlm:PowerLimitState`), meaning that a power limit may be toggled active or inactive.
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