Pulse Encoder 2 - Siemens SIMADYN D Hardware Manual

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Coarse / fine pulse
evaluation
Coarse pulse
Fine pulse
Evaluation signal
Case 1
Fig. 7-1 Coarse- and fine-pulse evaluation

7.2.3.1 Pulse encoder 2

Hardware - SIMADYN D
Edition 03.2001
HongKong|UK|China
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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 A fine pulse is received; the coarse pulse is not taken into
1 account; (also for disturbances/noise on the fine pulse)
Case Coarse- and fine pulse have an H signal level, however only 1
2
evaluation signal per coarse pulse (fine faults/noise are
suppressed)
Case
Coarse- and fine pulse have an H signal level,
3 fine pulse noise is not suppressed.
Case
After deleting the coarse pulse, a positive fine pulse edge was
4 identified.
Additional fine pulses (noise) are suppressed!
Case Coarse pulse is inactive (L signal level) and fine pulses are
5 active (H signal level),
the fine pulse noise is not suppressed!
Case 2 Case 3
Pulse encoders with different signal levels can be connected at encoder
input 2:
• RS422
• HTL± (± 3V)
• HTL (3V ... 8V)
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Case 4 Case 5
7
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