MMS: A Communication Language for Manufacturing

193 Pages·1995·8.438 MB·

by  Lawrence Cox (auth.)

Research Reports ESPRIT
Project 7096 . CCE-CNMA . Volume 2
Edited in cooperation with the European Commission
Springer
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ESPRIT Consortium CCE-CNMA (Eds.)
MMS: A Communication
Language for
Manufacturing
Springer
Volume Editors
ESPRIT Consortium CCE-CNMA
c/o CSC Manufacturing Practice
Guild Centre Offices
Lords Walk, Preston, Lancashire PR1 1 RE, UK
ESPRIT Project 7096, CCE-CNMA (CIME Computing Environment:
Integrating CNMA) belongs to the CIME sector (Computer-Integrated
Manufacturing and Engineering) of the ESPRIT Programme (European
Specific Programme for Research and Development in Information
Technologies) supported by the European Commission.
CCE-CNMA builds on the results of ESPRIT projects 955, 2617, and 5104
on CNMA (Communications Network for Manufacturing Applications),
progressing to new areas of technology.
The main objective of the project is to specify, implement and validate an
environment for the development and execution of manufacturing
applications. This environment integrates technologies and standards
from various organisations such as OSF (Open Software Foundation), ISO
or X/OPEN. The consortium continues work on a communication
infrastructure for industrial applications that is based on international
standards and develops tools for migration to and administration of this
vendor-independent communication network.
The 16 members of the ESPRIT consortium CCE-CNMA consist of CIM
Users, CIM Vendors, System Integrators and Academic Institutes from 6
European countries.
Cataloging-in-Publication Data applied for
Die Deutsche Bibliothek - CIP-Einheitsaufnahme
MMS: a communication language for manufacturing / ESPRIT
Consortium CCE-CNMA (ed.). - Berlin; Heidelberg; New
York: Springer, 1995
(Research reports ESPRIT: Project 7096, CCE-CNMA ; Vol. 2)
ISBN 3-540-59061-7
NE: ESPRIT Consortium CCE-CNMA; Research reports ESPRIT I 7096
CR Subject Classification (1991): C.2, J.6, 0.3-4, J.1, H.2
ISBN-13: 978-3-540-59061-3 e-ISBN-13: 978-3-642-79639-5
001: 10.1007/978-3-642-79639-5
Publication No. EUR 16172 EN of the European Commission,
Dissemination of Scientific and Technical Knowledge Unit,
Directorate-General Telecommunications, Information Market and Exploitation of
Research, Luxembourg.
© ECSC-EC-EAEC, Brussels-Luxembourg, 1995
LEGAL NOTICE
Neither the European Commission nor any person acting on behalf
of the Commission is responsible for the use which might be made
of the following information.
Typesetting: Camera-ready by the editors
SPIN: 10486046 45/3142-543210 - Printed on acid-free paper
Preface
Today's manufacturing environment is characterised by significant change in the
way it is able to respond to its business objectives. Companies now face new
challenges to meet customer demands including greater flexibility, a wider range
of products, higher quality, improved lead time, whilst maintaining _c.ompetitive
prices.
The changes manifest in each company will differ but, the trend is towards
providing a leaner, more responsive organisation. This is reflected in the need for
Information Technology (IT) systems to be more integrated across an enterprise
and for the systems to be provided on a distributed basis. At the same time it is
imperative that the costs associated with these IT systems and the range of skills
required by an enterprise to develop and support such systems should be minimal.
One way of achieving this objective is to adopt the use of standards. During
recent years there has been a lot of activity to standardise the way that
manufacturing devices communicate with each other. Considerable progress has
been made, thanks not least to the success of the international effort of stand
ardisation bodies like ISO, IEEE and IEC, and projects applying standardised
protocols like Manufacturing Automation Protocol (MAP), in the USA, Commun
ications Network for Manufacturing Applications (CNMA) in Europe and not
forgetting Mini-MAP and Fieldbus technology.
The most notable standard defined is ISO 9506-1 and 9506-2, Manufacturing
Message Specification (MMS) which provides the generic services designed to
facilitate the interworking of programmable devices on the shop floor. These
services are intended to be erihanced and augmented by companion standards,
each of which is oriented towards a specific class of application.
VI Preface
The purpose of this book is to describe what MMS is and how it can be used,
taking for example a real production facility at Mercedes-Benz, Germany. This
book is intended for engineers who are responsible for the specification, design,
development and integration of manufacturing systems. Familiarity with manu
facturing applications, existing communication protocols, and how manufacturing
equipment and devices can be integrated will increase the reader's appreciation of
the contents. The reader of this book will gain an understanding of how MMS can
be used, to derive its benefits and subsequently be able to either specify their own
requirements, or assess the advantages of solutions provided by vendors or
systems integrators.
References at the end of this book point to additional reading.
May 1995
Lawrence Cox / Patrick Pleinevaux
Trademarks
The following trademarks used in this book are hereby acknowledged:
• MAP is a registered trademark of General Motors.
• Intel is a registered trademark of Intel Corporation
• Microsoft, Windows, MS, DOS, Visual Basic, Visual C++, ODBC, Access,
Excel are registered trademarks of Microsoft Corporation
• IBM, SNA, CICS, CP/-C are registered trademarks of International Business
Machines
• INGRES is a registered trademark of Ingres Corp.
• SINEC HI, SINEC AP-TF are registered trademarks of Siemens
• UNITELWAY, MAPWAYare registered trademarks of Telemecanique
• MODBUS is a registered trademark of MODICON
• DECnet is a registered trademark of Digital
• Lotus 1-2-3 is a registered trademark of Lotus Development Corporation
• ORACLE is a registered trademark of Oracle Corporation
Contents
Preface ............................................................................................................... V
1. Introduction .......................................................................................... 1
Lawrence Cox
1.1 The need for standards ........................................................................... 1
1.2 Motivation for the book ......................................................................... 3
1.3 Purpose of the book ............................................................................... 3
1.4 Organisation of the book ...................................................................... .3
1.5 Acknowledgements ............................................................................... 5
2. Rationale and Context ......................................................................... 9
Patrick Pleinevaux
2.1 Rationale for MMS ................................................................................ 9
2.2 The OSI reference model ..................................................................... 10
2.3 MAP and CNMA ................................................................................. 12
2.4 Mini-MAP ........................................................................................... 13
2.5 Profibus ............................................................................................... 14
2.6 Summary ............................................................................................. 14
3. Manufacturing Message Specification (MMS) ................................ 15
Manfred Gaertner, Patrick Pleinevaux
3.1 Basics ................................................................................... , .............. 15
3.2 The MMS object model ....................................................................... 17
3.3 Confmned and unconfmned services .................................................. 21
3.3.1 Confmned services .............................................................................. 22
3.3.2 Unconfmned services .......................................................................... 23
3.4 The MMS-related standards ................................................................ 24
3.5 Summary ............................................................................................. 26
VIII Contents
4. MMS Core Object Classes ................................................................ 27
Manfred Gaertner
4.1 Virtual Manufacturing Device (VMD) ................................................ 27
4.1.1 Attributes of the VMD ......................................................................... 29
4.1.2 A simple example ................................................................................ 32
4.1.3 The UnsolicitedStatus service .............................................................. 33
4.1.4 Other attributes .................................................................................... 34
4.1.5 Naming in MMS ................................................................................. .34
4.1.6 Associations and the MMS environment ............................................. 34
4.2 Domains .............................................................................................. 35
4.2.1 Attributes of the domain object ........................................................... 36
4.2.2 Domain download initiated by the client ............................................. 39
4.2.3 Domain download initiated by the server ............................................ 43
4.2.4 Domain upload .................................................................................... 44
4.2.5 Deletion of a domain ........................................................................... 46
4.2.6 Getting the attributes of a domain ........................................................ 47
4.2.7 Practical example ................................................................................ 48
4.3 Program invocations ............................................................................ 49
4.3.1 Attributes ofa program invocation ...................................................... 50
4.3.2 Creation ofa program invocation ........................................................ 52
4.3.3 Starting a PI ......................................................................................... 53
4.3.4 Obtaining the state of a PI ................................................................... 54
4.3.5 Deletion ofa PI .................................................................................... 55
4.4 MMS variables .................................................................................... 56
4.4.1 Attributes of a named variable ............................................................. 56
4.4.2 Data types ............................................................................................ 57
4.4.3 Alternate access ................................................................................... 58
4.4.4 Getting the attributes ofa variable ....................................................... 59
4.4.5 Reading variables ................................................................................ 60
4.4.6 Writing variables ................................................................................. 60
4.5 Summary ............................................................................................. 60
5. MMS in Real Manufacturing Devices .............................................. 61
Patrick Pleinevaux, Werner Blumenstock
5.1 Introduction ......................................................................................... 61
5.2 The Siemens MMS implementation for
SIMATIC PLCs ................................................................................... 62
5.2.1 VMD related services ............................................................., . ............ 62
5.2.2 Accessing variables in the PLC ........................................................... 62
5.2.3 Managing domains in the PLC ............................................................ 63
5.2.4 Managing programs on the PLC .......................................................... 64
5.3 The Siemens MMS implementation for
SINUMERIK NCs ............................................................................... 64
5.3.1 Structure of the NC .............................................................................. 64
Contents IX
5.3.2 Accessing variables ............................................................................. 64
5.3.3 Managing domains .............................................................................. 65
5.3.4 Controlling programs ........................................................................... 65
5.3.5 Alarms ................................................................................................. 66
5.4 The TeIemtkanique MMS implementation for
TSX 47 PLCs ....................................................................................... 66
5.4.1 VMD related services .......................................................................... 66
5.4.2 Accessing variables in the PLC ........................................................... 66
5.4.3 Managing domains in the PLC ............................................................ 68
5.4.4 Managing programs on the PLC .......................................................... 68
5.5 Comparison of the two PLC MMS implementations ........................... 69
5.6 Summary ............................................................................................. 70
6. Use of MMS in a Real Manufacturing Application ........................ 71
Manfred Gaertner
6.1 Overview ............................................................................................. 71
6.2 Rail guided vehicle (RGV) .................................................................. 72
6.2.1 RGV state diagram .............................................................................. 73
6.2.2 Transportation of a pallet from a clamping station to
the pallet store ......................................................................•.............. 74
6.2.3 Transportation of a pallet from the pallet store to a
machining centre ................................................................................. 75
6.2.4 Mapping to MMS objects .................................................................... 76
6.2.5 MMS services offered by the RGV ..................................................... 78
6.3 Machining centre ................................................................................. 80
6.3.1 Overview of the information flow ....................................................... 80
6.3.2 Mapping to MMS objects and services ................................................ 80
6.3.3 NC-CS models used in the example manufacturing
facility .................................................................................................. 81
6.3.4 NC system state model ........................................................................ 82
6.3.5 NC device control model ..................................................................... 82
6.3.6 Alarm model ........................................................................................ 84
6.3.7 NC data store model ............................................................................ 85
6.3.8 Tool management ................................................................................ 86
6.3.9 NC program management .................................................................... 88
6.3.10 Tool data transfer ................................................................................. 89
6.4 Summary ............................................................................................. 90