4-16 Input / Output MN1957
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4.4.3.1 Encoder input frequency
The maximum encoder input frequency is affected by the length of the encoder cables.
The theoretical maximum frequency is 10 million quadrature counts per second. This is
equivalent to a maximum frequency for the A and B signals of 2.5 MHz. However, the effect
of cable length is shown in Table 1:
The maximum recommended cable length is 30.5 m (100 ft).
A and B signal
frequency
Maximum cable length
meters feet
1.3 MHz 26.56
500 kHz 10 32.8
250 kHz 20 65.6
100 kHz 50 164.0
50 kHz 100 328.1
20 kHz 300 984.2
10 kHz 700 2296.6
7kHz 1000 3280.8
Table 1: Effect of cable length on maximum encoder frequency
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07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
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