Technology subrack
Hardware - SIMADYN D
7-5
Edition 03.2001
7
A coarse/fine (zero) pulse evaluation is provided to suppress noise- or
bounce pulses for synchronous- and positioning tasks.
The coarse pulse enables a window for the fine pulse. Generally, coarse-
and fine pulse are defined by the mechanical design of the machine
(e.g. cams). The smoothing time of the coarse pulse input is approx. 1 ms
(as for binary inputs). The fine pulse has no smoothing time.
A differentiation is made between the following situations when evaluating
the coarse- and fine pulses:
The evaluation signal is generated, if...
Case
1
A fine pulse is received; the coarse pulse is not taken into
account; (also for disturbances/noise on the fine pulse)
Case
2
Coarse-
and
fine pulse have an H signal level, however only 1
evaluation signal per coarse pulse (fine faults/noise are
suppressed)
Case
3
Coarse-
and
fine pulse have an H signal level,
fine pulse noise is
not
suppressed.
Case
4
After deleting
the coarse pulse, a positive fine pulse
edge
was
identified.
Additional fine pulses (noise) are suppressed!
Case
5
Coarse pulse is inactive
(L signal level)
and
fine pulses are
active (H signal level),
the fine pulse noise is
not
suppressed!
Case 1
Case 2
Case 4
Case 5
Coarse pulse
Fine pulse
Evaluation signal
Case 3
Fig. 7-1 Coarse- and fine-pulse evaluation
7.2.3.1 Pulse encoder 2
Pulse encoders with different signal levels can be connected at encoder
input 2:
•
RS422
•
HTL± (± 3V)
•
HTL (3V ... 8V)
Coarse / fine pulse
evaluation
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www.aotewell.com
Industry Automation
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