Heidenhain PWM 8 Manuel d'utilisateur télécharger pdf (Page 54)

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TTL signal level U

≥ 2.5 V with −I

= 20 mA

≤ 0.5 V with I

= 20 mA

Load capacity − I

≤ 20 mA

Load

≤ 1000 pF

Switching times Rise time: t

≤ 100 ns

Fall time: t

−

≤ 100 ns

The fault detection signal

UaS indicates a malfunction, such as break of a supply line, lamp failure etc.

TTL square-wave signals can be transferred over cable lengths up to 300 m to the subsequent electronics.

For this purpose a supply voltage of 5 V ± 10% (for RAN 460: range between 10 and 30 V) must be ensured

at the linear or rotary encoder.

In the subsequent electronics TTL square-wave signals can be interpolated 100-fold max. by means of

phase-locked control loops.

Recommended input circuit of the subsequent electronics

Recommended differential line receivers

AM 26 LS 32

MC 3486

SN 75 ALS 193

SN 75 ALS 195

We recommend not to exceed the cable length related to the scanning frequency, since otherwise the

switching times resp. the edge gradient cannot be maintained.

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Heidenhain PWM 8 Manuel d'utilisateur Page 54