IEC PAS 62408:2005

Real-time Ethernet Powerlink (EPL)

It extends Ethernet according to the IEEE 802.3/ISO/IEC 8802-3 standard with mechanisms to transfer data with predictable timing and precise synchronisation. The communication profile meets timing demands typical for high-performance automation and motion applications. It does not change basic principles of the Fast Ethernet Standard IEEE 802.3 but extends it towards RTE. Thus it is possible to leverage and continue to use any standard Ethernet silicon, infrastructure component or test and measurement equipment like a network analyzer.

General Information

• Status: Replaced
• Publication Date: 27-Jun-2005
• ICS: 25.040.40 - Industrial process measurement and control
• ICS: 35.100.05 - Multilayer applications
• ICS: 35.240.50 - IT applications in industry
• Technical Committee: SC 65C - Industrial networks
• Drafting Committee: WG 9 - TC 65/SC 65C/WG 9
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 14-Dec-2007

Relations

• Replaced By: IEC 61158-5-13:2007 - Industrial communication networks - Fieldbus specifications - Part 5-13: Application layer service definition - Type 13 elements
• Effective Date: 05-Sep-2023
• Replaced By: IEC 61158-3-13:2007 - Industrial communication networks - Fieldbus specifications - Part 3-13: Data-link layer service definition - Type 13 elements
• Effective Date: 05-Sep-2023
• Replaced By: IEC 61158-4-13:2007 - Industrial communication networks - Fieldbus specifications - Part 4-13: Data-link layer protocol specification - Type 13 elements
• Effective Date: 05-Sep-2023
• Replaced By: IEC 61158-6-13:2007 - Industrial communication networks - Fieldbus specifications - Part 6-13: Application layer protocol specification - Type 13 elements
• Effective Date: 05-Sep-2023

Standards Content (Sample)

PUBLICLY
IEC
AVAILABLE
PAS 62408
SPECIFICATION
First edition
2005-06
Real-time Ethernet Powerlink (EPL)

Reference number
IEC/PAS 62408:2005(E)
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PUBLICLY
IEC
AVAILABLE
PAS 62408
SPECIFICATION
First edition
2005-06
Real-time Ethernet Powerlink (EPL)

© IEC 2005 – Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
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International Electrotechnical Commission
Международная Электротехническая Комиссия
For price, see current catalogue

– 2 – PAS 62408 © IEC:2005 (E)

CONTENT
FOREWORD . 14

1 General . 15

1.1 Scope and general description . 15

1.1.1 Slot Communication Network Management (SCNM) . 15

1.1.2 EPL key features. 16
1.1.3 Integration .17
1.1.4 Modular Machines. 18

1.2 Normative references. 19

1.3 Definitions and Abbreviations . 20

1.3.1 Definitions .20
1.3.2 Abbreviations . 23
2 Modelling. 24
2.1 Reference Model. 24
2.1.1 Application Layer . 24
2.1.1.1 Service Primitives . 25
2.1.1.2 Application Layer Service Types . 25
2.2 Device Model . 26
2.2.1 General .26
2.2.2 The Object Dictionary . 27
2.2.2.1 Index and Sub-Index Usage . 28
2.3 Communication Model . 28
2.3.1 Master/Slave relationship . 28
2.3.2 Client/Server relationship. 29
2.3.3 Producer/Consumer relationship - Push/Pull model. 30
2.3.4 Superimposing of Communication Relationships . 30
3 Physical Layer. 31
3.1 Topology . 31
3.1.1 Hubs. 31
3.1.2 Switches.31
3.2 Network Guidelines. 31
3.3 Connectors.32
3.3.1 RJ-45 . 32
3.3.2 M12 . 32
3.3.3 Cross Over Pin Assignment. 33
3.3.3.1 RJ45 to RJ45 . 33
3.3.3.2 M12 to M12. 34
3.3.3.3 M12 to RJ45. 34
3.4 Cables (recommendation). 34
4 Data Link Layer.35

4.1 Modes of Operation . 35
4.2 EPL Mode . 35
4.2.1 Introduction . 35
4.2.2 EPL Nodes. 35
4.2.2.1 EPL Managing Node. 35
4.2.2.2 EPL Controlled Node . 36
4.2.2.2.1 Isochronous CN . 36
4.2.2.2.2 Async-only CN . 36
4.2.3 Services .36
4.2.4 EPL Cycle . 36
4.2.4.1 Isochronous EPL Cycle . 36
4.2.4.1.1 Start period . 37
4.2.4.1.2 Isochronous period . 37
4.2.4.1.2.1 Multiplexed Timeslots . 38
4.2.4.1.3 Asynchronous period. 38
4.2.4.1.3.1 Asynchronous Scheduling . 39

PAS 62408 © IEC:2005 (E) – 3 –

4.2.4.1.3.2 Asynchronous Transmit Priorities. 40

4.2.4.1.3.3 Distribution of the Asynchronous period. 40

4.2.4.1.4 Idle Period. 40

4.2.4.2 Reduced EPL Cycle. 40

4.2.4.3 EPL CN Cycle State Machine. 41
4.2.4.3.1 Overview. 41
4.2.4.3.2 States. 41
4.2.4.3.3 Events. 41

4.2.4.3.4 Usage of the the NMT_CS state by the DLL_CS . 42

4.2.4.3.4.1 State NMT_CS_OPERATIONAL, NMT_CS_PRE_OPERATIONAL_2,

NMT_CS_READY_TO_OPERATE . 42

4.2.4.3.4.1.1 Transitions . 43

4.2.4.3.4.2 Other States. 44

4.2.4.3.4.2.1 Transitions in other NMT states. 45
4.2.4.4 EPL MN Cycle State Machine . 45
4.2.4.4.1 Overview. 45
4.2.4.4.2 States. 45
4.2.4.4.3 Events. 45
4.2.4.4.4 Usage of the NMT_MS state by the DLL_MS . 46
4.2.4.4.4.1 State NMT_MS_OPERATIONAL . 46
4.2.4.4.4.1.1 Transitions . 48
4.2.4.4.4.2 Other Modes . 49
4.2.5 Recognizing Active Nodes. 49
4.3 Basic Ethernet Mode. 49
4.4 MAC Adressing . 50
4.4.1 MAC Unicast. 50
4.4.2 MAC Multicast. 50
4.4.3 MAC Broadcast. 50
4.5 EPL Addressing . 50
4.6 Frame Structures . 51
4.6.1 Integration with Ethernet. 51
4.6.1.1 EPL Frame. 51
4.6.1.1.1 EPL Basic Frame. 51
4.6.1.1.2 Start Of Cyclic (SoC) . 52
4.6.1.1.3 PollRequest (PReq) .
...