Specifications

IP 240 Encoder Signals
Fig. 13-2. Timing Diagram for Symmetrical Incremental Encoders (Continued)
A signal
A signal
B signal
B signal
Z sign.
1)
Z sign.
Z sign.
2)
Z sign.
Z sign.
3)
Z sign.
Z sign.
4)
Z sign.
t
4
t
4
t
5
t
4
: min. 50 ns t
5
: max. 250 ns t
6
: min. 500 ns
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
An edge steepness of at least 5 V/µs is required for all signals.
t
6
c) Position and timing of the Z signal:
t
5
t
5
t
5
If the encoder has no Z signal, the Z input of a symmetrical encoder must be applied to a 1 signal
and the Z input to a 0 signal.
Note
The requirements regarding the position of the Z signal do not apply to IP 252
expansion mode, as neither reference point approach nor zero mark monitoring is
possible in this mode.
EWA 4NEB 811 6120-02a 13-3