ISO INTERNATIONAL STANDARD 20401 Second edition 2017-07 Pneumatic fluid power systems Directional control valves - Specification of pin assignment for 8 mm and 12 mm diameter electrical round connectors Transmissions pneumatiques - Distributeurs de commande directionnels - Spécification de I'affectation des broches des connecteurs électriques ronds de diametres 8 mm et 12 mm Reference number IS0 20401:2017(E) ISO @ IS0 2017 IS0 20401:2017(E) GetmoreFREEstandardsfromStandard SharingGroupand ourchats COPYRIGHT PROTECTED DOCUMENT @ IS0 2017, Published in Switzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 [email protected] www.iso.org ii @ IS0 2017 - All rights reserved IS0 20401:2017(E) Contents Page Foreword iv Introduction V 1 Scope. 1 2 Normative references 1 3 Terms and definitions 1 4 Integral connectors for plug-in proximity switches 5 Graphical symbols .2 6 Electrical contacts (pin allocation) 2 6.1 Identification 2 6.2 Pin allocation for valves with a single solenoid 3 6.3 Pinallocationforvalveswithdoublesolenoidsandoneconnector 3 6.4 Pinallocationforvalveswithdoublesolenoidsandtwoconnectors 3 Bibliography 5 IS02017-Allrightsreserved iii