Control Techniques SM-Encoder Output Plus, Руководство пользователя

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SM-Encoder Plus & SM-Encoder Output Plus User Guide
33
Issue: 4 www.controltechniques.com
How to
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Index
The output marker pulse is derived directly from the encoder simulation input source
marker pulse. The width of the marker pulse is not adjusted with the encoder simulation
ratio, but remains the same width as the input marker pulse. If a mode without marker
lock is selected then the relationship between the marker pulse position and the
incremental signals is undefined. If a mode with marker lock is selected the incremental
position is shifted when the first input marker pulse occurs so that with Ab mode the
marker pulse is aligned with A high and B high, and with Fd mode the marker pulse is
aligned with F high. Marker lock is required when the system that is receiving the
encoder simulation signals requires a defined relationship between the marker pulse
and the incremental signals. Marker lock should not be used if the drive encoder
equivalent lines per revolution (ELPR) in Pr
3.34 , is not a power of 2 or the ELPR of the
encoder simulation output is less than 1 after the divide ratio has been applied.
This position is taken from the position feedback device and is not affected by the
marker or the freeze inputs.
Each time the marker becomes active, the non-marker position values (Pr x.29 and Pr
x.30 ) are sampled and stored in Pr x.32 and Pr x.33 .
x.29 Non-marker reset revolution counter
RO Uni NC PT
Ú 0 to 65,535 revolutions Ö
Update rate: 4ms x number of dumb modules
x.30 Non-marker reset position
RO Uni NC PT
Ú
0 to 65,535 (1/2
16
ths of a
revolution)
Ö
Update rate: 4ms x number of dumb modules
x.32 Marker revolution counter
RO Uni NC PT
Ú 0 to 65,535 revolutions Ö
Update rate: 4ms x number of dumb modules
x.33 Marker position
RO Uni NC PT
Ú
0 to 65,535 (1/2
16
ths of a
revolution)
Ö
Update rate: 4ms x number of dumb modules
x.35 Freeze revolution counter
RO Uni NC PT
Ú 0 to 65535 revolutions Ö
Update rate: 4ms x number of dumb modules