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 | |
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 maximum encoder frequency
The maximum recommended cable length is 30.5m (100ft).
MN1904 | Input / Output |
