FM26001c_e.doc / Nov-11
Page 4 / 27
1. Introduction
The FM 260 unit has been designed for use as a programmable impulse multiplier of incremental
encoder signals. Encoder impulses applied to the input will be scaled by means of two adjustable
Factors, and the resulting impulse sequence will appear at the output with only a few microseconds
of delay.
The output frequency f
out
may be higher or lower than the input frequency f
in
, depending on the
factor settings. In principle the function of the unit allows conversion of any input frequency inside
the specified range to any other proportional output frequency.
This unit considers every individual impulse, with consideration of the counting direction indicated by
the quadrature A/B input phase. The number of generated output pulses is therefore accurate and
error-free with regard to input count and Factor setting, even with vibrations and changes of the
direction.
f
ou
t = f
in
Factor 1
Factor 2
(Factor 1 = 0,0005 - 9,9999,
Factor 2 = 0,0005 – 9,9999 )
The five-decade resolution of both factors provides precision scaling of the desired output with
regard to the input signal.
Moreover, if applicable, a marker pulse with programmable ppr number can be generated, either
with or without synchronization to an input index pulse.
Setup of the unit requires setting of the few parameters only, which may be done by means of the
front keys and the LCD menu or via PC using the serial link or the USB port of the unit.
For all PC operation the operator software OS32 is suitable (included in delivery).
Some applications may require changing settings during operation (e.g. change of the input/output
ratio "on the fly"). This is easily possible via serial link, via USB or by means of a PROFIBUS network
(gateway PB251 needed).
The versatile impulse input of the unit can be set for use with all common standard encoders or
sensors. Independent of the selected input format the output provides always a full set of the signals
A, /A, B, /B and Z, /Z. The output stages are push-pull type and provide an output level of 5 – 30
volts corresponding to the remote supply voltage applied to the output drivers.
Concerning the shape of the output signals, please observe the special hint
given on page 6 of this manual
