Datalogic ENC-58 PROG, Instruction Manual, Page: 26 / 38

ENC58 PROG
21
NOTE
Please note that the maximum counting frequency of an encoder,
expressed in kHz, results from the number of revolutions per minute
(RPM) -i.e. its rotational speed- and the number of pulses per
revolution (PPR) -i.e. its resolution.
It can be calculated by using the following algorithm:
Maximum counting frequency (kHz) = RPM * PPR
60 * 1000
It follows that the higher the maximum rotational speed of the encoder and
its resolution, the higher the counting frequency. This has to be
considered carefully when you program the encoder, in particular referring
to the maximum counting frequency of the encoder as stated in the
technical specifications, to the following electronic equipment and to the
length of the cables.
If you reverse the formula you can easily calculate the maximum number
of revolutions starting from the value of the counting frequency (as
allowed by the encoder, permitted by the subsequent electronics and
accepted by the cable run) and the desired number of pulses per
revolution:
RPM = Maximum counting frequency (kHz) * 60 * 1000
PPR
The reversed formula can be very useful -for instance- when you
know the maximum counting frequency that is applicable to the
system (because of the encoder, the following electronics and the
cable length) and you need to calculate the maximum rotational
speed the encoder is allowed to reach at the desired resolution.
EXAMPLES
Here are some examples useful to better understand the application
field of the programmable resolution. We assume that the pulse
multiplication factor in the following electronics is x 1.