Description of the Software Modules and Parameters
Parameter manual
b maXX
BM5800
Document No.: 5.16029.03
221
3
With triggering from a digital input, the allocation positive/negative edge is dependent on
the direction of revolution. The measured values of the positive edge at positive direction
of revolution are equal to the measured values of the negative edge at negative direction
of revolution. The measured values of the negative edge at positive direction of revolution
are equal to the measured values of the positive edge at negative direction of revolution,
and where necessary adding the measuring inaccuracy due to the encoder’s resolution.
With triggering from zero pulse, the measured value of the positive edge is independent
of the direction of revolution, the measured value of the negative edge differs depending
on the direction of revolution by maximum ± ¼ number of pulses.
So only the positive edge should be analyzed by triggering from zero pulse.
Figure 68:
Direction of revolution
High
Low
J
High
Low
J
High
Low
J
High
Low
J
Zero pulse
Positive direction of revolution
Zero pulse
Negative direction of revolution
Digital input
Digital input
Positive
(rising)
edge
Negative
(falling)
edge
Positive
(rising)
edge
Negative
(falling)
edge
Positive direction of revolution
Positive
(rising)
edge
Negative
(falling)
edge
Negative direction of revolution
Positive
(rising)
edge
Negative
(falling)
edge