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12.1.4 Output Signals

HTL

HTL square-wave signals

The design of encoders with HTL square-wave signals is similar that of encoders with TTL square-wave

signals. Output signals are HTL square-wave pulse trains Ua1 and Ua2 together with the reference pulse

Ua0 that is gated with the incremental signals Ua1 and Ua2.

To each square-wave pulse train the integral electronics in addition outputs the corresponding inverted

signal (not with ERN 1030). The outputs of encoder with HTL square-wave signals are short-circuit proof at

room temperature.

Incremental signals: HTL square-wave pulse trains Ua1 and Ua2 and their inverted

pulse trains

Ua1 and Ua2 (ERN 1030: no inverted pulse trains).

Ua2 lags Ua1 with ccw rotation (view on shaft or encoder flange).

Edge separation a ≥ 0.45 µs at 300 kHz scanning frequency

a ≥ 0.8 µs at 160 kHz scanning frequency

The scanning frequency depends on the encoder model and can be seen from the specifications.

Ref. mark signal 1 square-wave pulse Ua0 and its inverted pulse

Ua0

ERN 1030: no

Ua0

Pulse width 90° elec.

Delay time It

l ≤ 50 ns for gated ref. pulse

Fault detection signal 1 square-wave pulse

UaS

UaS = LOW: fault detected

UaS = HIGH: encoder operates properly

(short circuit not permissible after Up)

ERN 1030: no fault detection signal

UaS

Signal level HTL U

≥ 21 V with −I

= 20 mA

≤ 2.8 V with I

= 20 mA

if supply voltage is +24 V, without cable

Load capacity − I

≤ 200 mA (not true for

UaS )

≤ 200 mA

Load

≤ 1000 pF

Switching times Rise time: t

≤ 200 ns

Fall time: t

−

≤ 200 ns

1 2 ... 50 51 52 53 54 55 56 57 58 59 60 ... 89 90

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