Timing Requirements For Encoders With Asymmetrical Signals; Timing At Binary Input In; Timing Diagram For Asymmetrical Encoders - Siemens Simatic S5 IP 240 Manual

Encoder Signals

Timing requirements for encoders with asymmetrical signals

a) Skew between tracks A and B (minimum edge spacing):
A* signal
t
1
B* signal
b) Position and timing of the Z signal:
A* signal
B* signal
1) Z*
signal
2) Z*
signal
3) Z*
signal
4) Z*
signal
t : min. 2.5 µs
1
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
Fig. 13-3. Timing Diagram for Asymmetrical Encoders

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
t
1
t
2
t
5
t
t
5
t
4
t : min. 5.0 µs t : min. 2.5 µs
2 4
t
1
t
2
t
5
6
t
5
t
4
t : min. 2.5 µs
5
IP 240
t
1
t : min. 7.5 µs
6
EWA 4NEB 811 6120-02a