Pilz PSEN enc s2 eCAM Manual do Utilizador descarregar pdf (Página 72)

Installation / Preparation for commissioning

Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Deutschland

Telefon +49 711 3409-0, Telefax +49 711 3409-133, E-Mail: [email protected]

English

5.2 SSI communication mode

SSI mode is a synchronous serial communication mode for the position of the

measuring system. By using the RS422 interface for communication, sufficiently high

transmission rates can be achieved.

The measuring system receives a sequence of clock signals from the data receiver

(control system) and responds with the current position value, which is transmitted

serially and synchronously with the sent clock pulse.

As data transfer is synchronised by the start of the clock signals, it is not necessary to

use single-step codes such as Gray code, for example.

The data signals Data+ and Data– are sent using cable transmitters (RS422). The

clock signals Clock+ and Clock- are received via optocouplers to protect against

damage resulting from interference, potential differences or reverse polarity.

SSI-Clock+

SSI-Clock-

2.2 nF

N.C.

GND

+5V

BAV99

Opto-Koppler

Fig. 8: SSI principle input circuit (Key: Opto-Koppler – Optocoupler)

Data+

Data-

RS422

Fig. 9: SSI output circuit

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Pilz PSEN enc s2 eCAM Manual do Utilizador Página 72