RMS

Calculates the temporal RMS value for single and multi-channel real-valued signals.

The documentation of the corresponding PLC function block can be found here: FB_CMA_RMS

Configuration options

• Number of Channels: defines the number of independent channels. This must be greater than zero.
• Buffer Length: is the number of input values per channel held in the internal buffer.
• Transform to Decibel: is a Boolean value that indicates whether the result of the FFT is to be transformed to the decibel scale, according to transformation x -> 20 * log10(x).
• Decibel Threshold: is a very small floating point value greater than zero. Values that are less than this number are replaced with this value before any transformation to the decibel scale. (The purpose is the avoidance of value range errors. The logarithm of zero is not defined and strives infinitely towards minus for the limit value of small arguments. The same applies to the argument of the number zero, arg(0). The smallest possible value is 2.3e-308)

Output values

• Output: RMS value of the associated input data stream.
• Cnt Results: specifies the number of output arrays calculated.
• New Result: is a Boolean value that indicates whether a new result was obtained in the current cycle.