FU25201a_e_A5 / Nov-07
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2.2.
Operating range
The full scale frequency (i.e. the input frequency where the analogue output reaches 10 V or
20 mA) can be set in a range from –1 MHz to +1 MHz. The operating range of the unit can be
assigned to any frequency window inside this frequency range.
Also a zero output frequency can be set to guarantee defined operation of the converter with
low input frequencies.
For applications with unstable input frequencies, the unit provides programmable digital filters
for smoothing of the output signal.
2.3.
Suitable encoders and sensors
The FU252 converter can accept the following impulse sources:
•
Quadrature encoders with HTL level output (10 – 30 V) and either PNP or NPN or
Push-Pull or NAMUR characteristics, using A and B outputs wit 90° displacement
•
Single channel impulse sources like proximity switches or photocells, providing HTL
level at PNP or NPN or Namur characteristics
•
TTL / RS422 quadrature encoders with output lines A, /A ,B and /B
•
Symmetric single channel sources with TTL / RS422 output, providing differential
signals (e.g. A and /A)
•
Asymmetric single channel sources wit TTL level (without inverted signals, e.g. A only)
In general, HTL encoders will be supplied from the same source as the converter itself.
For supply of TTL encoders, the xit provides an auxiliary output of 5.5 volts (stabilized, max.
250 mA).
