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Input / Output 4-13MN1904
4.7.2 Encoder input frequency
The maximum encoder input frequency is affected by the length of the encoder cables. The
theoretical maximum frequency is 7.5 million quadrature counts per second. This is equivalent
to a maximum frequency for the A and B signals of 1.87MHz. However, the effect of cable
length is shown in the Table 1:
Encoder
Maximum cable length
E
n
c
o
d
e
r
Frequency
meters feet
1.3MHz 2 6.56
500kHz 10 32.8
250kHz 20 65.6
100kHz 50 164.0
50kHz 100 328.1
20kHz 300 984.2
10kHz 700 2296.6
7kHz 1000 3280.8
Table 1 - Effect of cable length on maxim um encoder frequency
The maximum recommended cable length is 30.5m (100ft).