Measurement data

Each module of the Measure group provides the recorded measurement data as output process data via a defined Data Area.

The measurement data is divided into logically separate structures, which can be individually enabled or disabled as required under Data Area in the Enable column. When starting up, the module automatically recognizes the activated structures and only reads the relevant measured values from the EtherCAT Terminal or carries out the necessary calculations.

Each of these structures begins with a timestamp (nTimestamp), which indicates the time of the last update in distributed clocks time (DC time). This is followed by the diagnostic structure (Diag), which contains status information such as when measuring ranges are exceeded or not reached. This is followed by the actual measurement data, which can be divided into further substructures, for example to distinguish between phase-neutral (LN) and phase-phase voltages (LL).

By default, the measured values are provided as effective values per phase and as a mean value across all three phases. The power is output as a sum across all three phases. All values are given in SI units (e.g. volts, amperes, watts) and are represented as single-precision floating-point numbers in accordance with IEEE 754.

The following is an overview of the data types for corresponding structures: