BECKHOFF DK9222-0909-0005 - Manual

XFC
XFC technology oversampling
Application Note DK9222-0909-0005
Keywords
XFC
oversampling
Distributed Clocks
EtherCAT
EL1262
EL2262
EL3632
EL3702
EL3742
EL4712
EL4732
Oversampling
Oversampling is a special type of signal sampling that is used for refining the time resolution of a signal.
Detection of the signal curve is refined according to the set oversample factor, so that high resolutions of
up to 1 µs (digital EL12xx input terminals) and 10 µs (analog EL37xx input terminals) are possible.
Technical background
Oversampling means that a signal is scanned with a higher frequency within the terminal than would be required for the signal
transfer. The time window of the signal variation is narrower than the duration of a communication cycle, since sampling takes
place several times within a communication cycle. In order to maintain the chronology of the events, a whole set of process
data is transferred to the controller during the next communication cycle.
Achieving shorter cycle times via high-performance fieldbus technology and high-performance processors is one technique for
improving the time resolution of the signal curve in the field. Alternatively, the higher precision can be achieved through high-
precision input and output terminals, rather than during data transfer. This technical approach for finer time resolution of the
data requires a reliable time relationship between all system devices to be generated.
New Automation Technology Beckhoff 
For application notes see disclaimer on the last page