Geo Brick Drive User Manual
Pinouts and Software Setup
67
Encoder Count Error (Mxx18)
The Geo Brick Drive has an encoder count error detection feature. If both the A and B channels of the
quadrature encoder change state at the decode circuitry (post-filter) in the same hardware sampling clock
(SCLK) cycle, an unrecoverable error to the counter value will result (lost counts). Suggested M-Variable
Mxx18 for this channel is then set and latched to 1 (until reset or cleared). The three most common root
causes of this error:
-
Real encoder hardware problem
-
Trying to move the encoder (motor) faster than it’s specification
-
Using an extremely high resolution/speed encoder. This may require increasing the SCLK
The default sampling clock in the Geo Brick Drive is ~ 10MHz, which is acceptable for virtually all
applications. A setting of I7mn3 of 2257 (from default of 2258) sets the sampling clock SCLK at about
~20MHz. It can be increased to up to ~40 MHz.
Note
No automatic action is taken by the Geo Brick Drive if the encoder
count error bit is set.
Содержание Geo Brick
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