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360° (Signal period)
NAS
Z
2
Z
0
Z
1
a
0
0
0
0
90° (Phase difference)
Signal Curve
NAS high:
Encoder functioning properly, input signals
within tolerance range
NAS low:
Check the measuring system
a:
Minimum edge separation as a function of
the interpolation factor and traversing speed
(see also 3.4. or speed chart at 9.2.)
Image 13
Encoders with TTL interface incorporate electronics that digitize sinusoidal scanning signals
with or without interpolation� The incremental signals are transmitted as the square-wave pulse
trains Z
1
and Z
2
, phase-shifted by 90° elec� The reference mark signal consists of one or more
reference pulses Z
0
, which are gated with the incremental signals�
In addition, the integrated electronics produce their inverted signals Z
1-
, Z
2-
and Z
0-
for noise-
proof transmission. The illustrated sequence of output signals (with Z
2
lagging Z
1
) applies to the
direction of motion shown in the dimension drawing�