Example: Table with IEC addresses column E/A area, variable names column identifier for input/output and
texts for the visualisation LDSWin:
6.2.3 Marker $REF - channel reference
A data point is uniquely identified in LDSWin via the channel reference. All properties of a data point including
the variable name ($EA1) and the variable address in the process image ($EA2) can be changed without
affecting an already existing visualisation in LDSWin. The channel reference must be unique within the entire
system, i.e. the signal lists of two different controllers must not both contain the same channel reference.
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