Siemens IP-Module Dokumentacja Strona 332

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Encoder Signals IP 240
Timing requirements for encoders with asymmetrical signals
Fig. 13-3. Timing Diagram for Asymmetrical Encoders
t
5
t
5
1) Position of the Z signal at minimal signal length
2) Position of the Z signal when the Z signal corresponds to the A signal
3) Position of the Z signal when the Z signal corresponds to the B signal
4) Position of the Z signal at maximum signal length
A* signal
B* signal
1) Z*
signal
2) Z*
signal
3) Z*
signal
4) Z*
signal
t
6
t
5
t
4
t
1
: min. 2.5 µst
2
: min. 5.0 µst
4
: min. 2.5 µst
5
: min. 2.5 µst
6
: min. 7.5 µs
b) Position and timing of the Z signal:
t
5
t
4
A* signal
B* signal
t
1
a) Skew between tracks A and B (minimum edge spacing):
t
1
t
1
t
1
t
2
t
2
13.2 Timing at Binary Input IN
Binary input IN is used as preliminary contact signal during reference point approach in position
decoding and positioning mode. For positioning with external synchronization, this input is also
used for connecting the synchronization signal.
Only bounce-free 5 V or 24 V encoders are permissible.
13-4
EWA 4NEB 811 6120-02a
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