The Swedish company Leine & Linde has extended its product range to incorporate absolute 25-bit multi-turn encoders for industry. Accuracy is claimed to be very high. Production hold-ups can be avoided or minimised due to advanced diagnostics and error-handling functions, thus saving time and money. The encoder, which is bus-connected, supports the standard SSI, PROFIBUS-DP, and CAN-bus interfaces.

According to the manufacturer, the encoder is suitable for applications such as materials handling, packaging and textile machinery, machine tools, and various automated manufacturing processes. The encoder is programmable and has advanced alarm and warning functions.
‘After a power failure, this type of encoder allows the operator to restart the machine without having to reset it’, explained Ulf Thorsander, designer at the company. ‘In the same way, an automatic warehouse truck fitted with a multiturn encoder can return to its programmed course after a breakdown without missing a retrieval point.
‘A machine tool can have as many as eight or ten spindles’ Thorsander continued. ‘So it takes a long time to get them all back to the datum point after a power failure. There’s a high risk of error, and a mistake in resetting can mean high scrappage rates in large production runs. Using an absolute multiturn encoder avoids these risks’.

Bus-connected encoder
Parallel and incremental encoders require input from one computer each. This new encoder is bus-connected, which means reduced costs for cabling and in some cases also for connector cards. Bus-connection also ensures intelligent communication between the encoder and the machine control system, the computer. The operator is thus given information on the encoder’s status and can rapidly change any encoder which is not functioning. In such cases, the machine is automatically shut down by the control system.
The device is a 25-bit high-quality multiturn encoder with a resolution of 13 bits per rev(8,192 positions), as well as 12-bit rev-counting, which is to say that it will count 4,096 revs before it restarts from zero. The resolution (gauge length) and zero-point can be adapted via the software for various mechanical installations. Measurement accuracy is claimed to be better than ± 0.5 bit.
‘We have brought about the development of a specification (profile) for how optical angle encoders communicate via the PROFIBUS-DP interface’, claimed Ulf Thorsander. ‘The new PROFIBUS encoder supports classes 1 and 2 in this profile’.
/ins
Footnote: Leine & Linde is certificated to the ISO 9001 quality standard. The company has 30 years’ experience of developing encoders and regards itself as Scandinavia’s leading manufacturer of opto-electrical angle-encoders with over 50% of the market.

Caption:The multiturn encoder is programmable and has advanced alarm, diagnostic, and warning functions. This ensures that costly production hold-ups can be avoided or minimised.

For further information please contact:
(UK:)
McLennan Servo Supplies Ltd
Jon Bentley
Yorktown Industrial Estate
Doman rd
CAMBERLEY, Surrey GU15 3DF
Tel: 01276 26146;
Fax: 01276 23452
******************

(Austria:)
Datatronic GmbH
Erich Proprenter
Triester Str. 14
A-2351 Wiener Neudorf
Tel: 2236 267780; Fax: 2236 23658

(Denmark:)
Berendsen Eltech
Peter Nielsen
/Benny Hansen (teknisk inf.)
Telefonvej 8
DK-2860 Søborg
Tel: 39 57 71 70; Fax: 39 57 71 72

(Finland:)
Finn Metric Oy
Reijo Litmanen
PL 4
FI-02201 ESPOO
Tel: (09) 476 1600
Fax: (09) 476 16700

(Germany:)
Leine & Linde Deutschland GmbH
Josef Klopfer
Spitalstraße 19
DE-73430 Aalen
Tel: 07361-961636
Fax: 07361-961635
E-mail: j.klopfer@leinelinde.de

(Italy:)
Servotecnica S.r.l.
Ugo Picinelli
Viale Lombardia 20
I-20095 Cusano Milanino (MI)
Tel:02 664201; Fax:02 66401020
E-mail: info@servotecnica.it

(Netherlands:)
Wim de Koning
Isotron Systems B.V.
Postbus 2232
NL-5202 CE ’s-Hertogenbosch
Tel: 073-6391 639
Fax: 073-6391 699

(Norway:)
Metric A/A
Jack Ski
Postboks 164, Holmlia
N-1203 Oslo
Tel:22-76 40 00; Fax:22-76 40 50

(Spain:)
Intertronic Internacional, S.L.
Enrique Gil Gandía
C/ Azagador de la Torre, 67-bis
ES-46026 Valencia
Tel: 996-375 80 50
Fax: 996-375 10 22

(Sweden:)
Leine & Linde AB
Bengt Rymell, Export Manager
Box 8
S-645 21 STRÄNGNÄS, Sweden
Tel:+46 1522 6500
Fax:+46 1522 6505
E-mail: info@leinelinde.se

(Switzerland:)
Bachofen AG
Walter Erb
Postfach 27
CH-8610 Uster
Tel: 1 9441111
Fax: 1 9441233

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