IEC 62264-1:2003

INTERNATIONAL IEC
STANDARD
62264-1
First edition
2003-03
Enterprise-control system integration –
Part 1:
Models and terminology
Reference number
Publication numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60000 series. For example, IEC 34-1 is now referred to as IEC 60034-1.
Consolidated editions
The IEC is now publishing consolidated versions of its publications. For example,
edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the base publication, the
base publication incorporating amendment 1 and the base publication incorporating
amendments 1 and 2.
Further information on IEC publications
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology. Information relating to
this publication, including its validity, is available in the IEC Catalogue of
publications (see below) in addition to new editions, amendments and corrigenda.
Information on the subjects under consideration and work in progress undertaken
by the technical committee which has prepared this publication, as well as the list
of publications issued, is also available from the following:
• IEC Web Site (www.iec.ch)
• Catalogue of IEC publications
The on-line catalogue on the IEC web site (http://www.iec.ch/searchpub/cur_fut.htm)
enables you to search by a variety of criteria including text searches, technical
committees and date of publication. On-line information is also available on
recently issued publications, withdrawn and replaced publications, as well as
corrigenda.
• IEC Just Published
This summary of recently issued publications (http://www.iec.ch/online_news/
justpub/jp_entry.htm) is also available by email. Please contact the Customer
Service Centre (see below) for further information.
• Customer Service Centre
If you have any questions regarding this publication or need further assistance,
please contact the Customer Service Centre:
Email: custserv@iec.ch
Tel: +41 22 919 02 11
Fax: +41 22 919 03 00
INTERNATIONAL IEC
STANDARD
62264-1
First edition
2003-03
Enterprise-control system integration –
Part 1:
Models and terminology
 IEC 2003
All rights reserved. Unless otherwise specified, 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.
IEC Copyright Office Case postale 56 CH-1211 Genève 20 Switzerland
• • •
PRICE CODE
XB
For price, see current catalogue

– 2 – 62264-1  IEC:2003(E)
CONTENTS
FOREWORD . 5
INTRODUCTION .7
1 Scope. 9
2 Normative references . 9
3 Terms and definitions .10
4 Enterprise-control system integration overview.13
4.1 Introduction .13
4.2 Criteria for inclusion in manufacturing operations and control domain.14
5 Hierarchy models .15
5.1 Hierarchy model introduction .15
5.2 Scheduling and control hierarchy.15
5.3 Equipment hierarchy.19
5.4 Decision hierarchy .21
6 Functional data flow model.22
6.1 Functional data flow model contents .22
6.2 Functional data flow model notation.22
6.3 Functional enterprise-control model .23
6.4 Functions.23
6.5 Information flows .29
7 Object model.34
7.1 Model explanation .34
7.2 Categories of information.35
7.3 Object model structure.42
7.4 Object model extensibility .43
7.5 Resources and views.43
7.6 Production capability information .52
7.7 Product definition information .56
7.8 Production information.59
7.9 Model cross-reference .67
8 Completeness, compliance and conformance .70
8.1 Completeness.70
8.2 Compliance .70
8.3 Conformance .70
Annex A (informative) IEC 62264 relationship with some other standardization work in
the manufacturing related area.71
Annex B (informative) Business drivers and key performance indicators .77
Annex C (informative) Discussion on models.84
Annex D (informative) Selected elements of the Purdue Reference Model.87
Annex E (informative) PRM correlation to MESA International
model and IEC 62264 models.131
Annex F (informative) Systems, resources, capability, capacity and time .134
Bibliography.141

62264-1  IEC:2003(E) – 3 –
Figure 1 – Outline of models in the standard .13
Figure 2 – Enterprise-control system interface .14
Figure 3 – Functional hierarchy .15
Figure 4 – Equipment hierarchy.19
Figure 5 – Functional enterprise/control model.23
Figure 6 – Areas of information exchange .35
Figure 7 – Production capability information.36
Figure 8 – Process segment capabilities .37
Figure 9 – Production information definition .38
Figure 10 – Example of process segments .39
Figure 11 – Possible information overlaps .40
Figure 12 – Production information.40
Figure 13 – Segment relationships .42
Figure 14 – Personnel model.44
Figure 15 – Equipment model.45
Figure 16 – Material model.48
Figure 17 – Process segment model .51
Figure 18 – Production capability model.53
Figure 19 – Process segment capability model.55
Figure 20 – Current and future capacities.56
Figure 21 – Product definition model .57
Figure 22 – Production schedule model.60
Figure 23 – Production performance model .64
Figure 24 – Object model inter-relations.68
Figure B.1 – Multiple business and production processes.78
Figure C.1 – Scope for Purdue Reference Model (PRM) for manufacturing.86
Figure D.1 – Assumed hierarchical computer control structure for a large
manufacturing complex .88
Figure D.2 – Assumed hierarchical computer control system structure for an industrial
plant.89
Figure D.3 – Assumed hierarchical computer control structure for an industrial
company to show Level 5 and its relationship to Level 4.90
Figure D.4 – Definition of the real tasks of the hierarchical computer control system (as
modified).94
Figure D.5 – Hierarchy arrangement of the steel plant control to show relationship of
hierarchy to plant structure.99
Figure D.6 – Hierarchy arrangement of the steel plant control system as studied for
energy optimization.99
Figure D.7 – Hierarchy arrangement of the paper-mill control to show relationship of
hierarchy to plant structure.100
Figure D.8 – The hierarchy control scheme as applied to a petrochemical plant .100
Figure D.9 – The hierarchy control scheme as applied to a pharmaceuticals plant .101
Figure D.10 – Computer-integrated manufacturing system (CIMS) (Cincinnati-Milicron
proposal).101
Figure D.11 – Relationship of the several classes of functional entities which comprise
the CIM reference model and computer-integrated manufacturing itself.109

– 4 – 62264-1  IEC:2003(E)
Figure D.12 – Major external influences as used in the data-flow model.109
Figure D.13 – Requirements interfacing of corporate management and staff functional
entities to the factory.110
Figure D.14 – Report interfacing to corporate management and staff functional entities
from the factory.110
Figure D.15 – Interface of government regulations, etc., to the factory .111
Figure D.16 – 0.0 facility model.112
Figure D.17 – 1.0 order processing .113
Figure D.18 – 2.0 production scheduling .114
Figure D.19 – 3.0 production control .115
Figure D.20 – 3.1 process support engineering .116
Figure D.21 – 3.2 maintenance .117
Figure D.22 – 3.3 operations control .118
Figure D.23 – 4.0 materials and energy control .119
Figure D.24 – 5.0 procurement.120
Figure D.25 – 6.0 quality assurance .121
Figure D.26 – 7.0 product inventory .122
Figure D.27 – 8.0 cost accounting .123
Figure D.28 – 9.0 product shipping administration.124
Figure F.1 – Production or manufacturing system.137
Figure F.2 – IDEFO actigram .137
Table 1 – Yourdon notation used.22
Table 2 – UML notation used.43
Table 3 – Model cross-reference . 69-70
Table D.1 – Generic list of duties of all integrated information and automation systems .92
Table D.2 – An overall plant automation system provides.92
Table D.3 – Notes regarding optimization (improvement) of manufacturing efficiency.93
Table D.4 – Summary of duties of control computer systems.93
Table D.5 – Potential factors for facilitating integrated control system
development and use .95
Table D.6 – Required tasks of the intra-company management information system
(Level 4B of Figure D.1 or Figure D.2 or Level 5 of Figure D.3) .95
Table D.7 – Duties of the production scheduling and operational management level
(Levels 4A or 5A) .95
Table D.8 – Duties of the area level (Level 3).96
Table D.9 – Duties of the supervisory level (Level 2).97
Table D.10 – Duties of the control level (Level 1) .97
Table D.11 – Information flow model of generic production facility mini-specs
(definition of functions).102-108
Table D.12 – Correlation of information flow tasks with the tasks
of the scheduling and control hierarchy .125

62264-1  IEC:2003(E) – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
ENTERPRISE-CONTROL SYSTEM INTEGRATION –
Part 1: Models and terminology
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International
Organization for Standardization (ISO) in accordance with conditions determined by agreement between the
two organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical specifications, technical reports or guides and they are accepted by the National
Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62264-1 has been developed by subcommittee 65A: System aspects,
of IEC technical committee 65: Industrial-process measurement and control, and by
ISO technical committee 184/SC5: Architecture, communication and integration frameworks.
This standard is based upon ANSI/ISA-95.00.01-2000, Enterprise-Control System Integration,
Part 1: Models and Terminology. It is used with permission of the copyright holder, the
*
Instrumentation, Systems and Automation Society (ISA) . ISA encourages the use and
application of its industry standards on a global basis.
This standard was submitted to the National Committees for voting under the Fast Track
Procedure as the following documents:
FDIS Report on voting
65A/369/FDIS 65A/373/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table. In ISO, the standard has been approved by 10 P members
out of 10 having cast a vote.
___________
*
For information on ISA standards, contact ISA at: ISA – The Instrumentation, Systems and Automation Society,
PO Box 12277, Research Triangle Park, NC 27709, USA, Tel. 1+919.549.8411, URL: standards.isa.org.

– 6 – 62264-1  IEC:2003(E)
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
IEC 62264 consists of the following parts under the general title Enterprise-control system
integration:
– Part 1: Models and terminology
– Part 2: Object models and attributes
– Part 3: Models of manufacturing operations
The committee has decided that the contents of this publication will remain unchanged until
2006. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
A bilingual version of this standard may be issued at a later date.

62264-1  IEC:2003(E) – 7 –
INTRODUCTION
IEC 62264 is a multi-part standard that defines the interfaces between enterprise activities
and control activities. This standard provides standard models and terminology for describing
the interfaces between the business systems of an entreprise and its manufacturing-control
systems. The models and terminology presented in this standard
a) emphasize good integration practices of control systems with enterprise systems during
the entire life cycle of the systems;
b) can be used to improve existing integration capabilities of manufacturing control systems
with enterprise systems; and
c) can be applied regardless of the degree of automation.
Specifically, this standard provides a standard terminology and a consistent set of concepts
and models for integrating control systems with enterprise systems that will improve
communications between all parties involved. Some of the benefits produced will
a) reduce users' times to reach full production levels for new products;
b) enable vendors to supply appropriate tools for implementing integration of control systems
to enterprise systems;
c) enable users to better identify their needs;
d) reduce the costs of automating manufacturing processes;
e) optimize supply chains; and
f) reduce life-cycle engineering efforts.
It is not the intent of this standard to
− suggest that there is only one way of implementing integration of control systems to
enterprise systems;
− force users to abandon their current methods of handling integration; or
− restrict development in the area of integration of control systems to enterprise systems.
This standard discusses the interface content between manufacturing-control functions and
other enterprise functions, based upon the Purdue Reference Model for CIM (hierarchical
form) as published by ISA. This standard presents a partial model or reference model as
defined in ISO 15704.
The scope of this standard is limited to describing the relevant functions in the enterprise and
the control domain and which objects are normally exchanged between these domains.
Subsequent parts will address how these objects can be exchanged in a robust, secure, and
cost-effective manner preserving the integrity of the complete system.
The intent of Clause 4 is to describe the context of the models in Clause 5 and Clause 6. It
gives the criteria used to determine the scope of the manufacturing control system domain.
Clause 4 does not contain the formal definitions of the models and terminology but describes
the context to understand the other clauses.
The intent of Clause 5 is to describe hierarchy models of the activities involved in
manufacturing-control enterprises. It presents in general terms the activities that are
associated with manufacturing control and the activities that occur at the business logistics
level. It also gives an equipment hierarchy model of equipment associated with manufacturing
control.
– 8 – 62264-1  IEC:2003(E)
The intent of Clause 6 is to describe a general model of the functions within an enterprise
which are concerned with the integration of business and control. It presents, in detail, an
abstract model of control functions and, in less detail, the business functions that interface to
control. The purpose is to establish a common terminology for functions involved in
information exchange.
The intent of Clause 7 is to state in detail the objects that make up the information streams
defined in Clause 6. The purpose is to establish a common terminology for the elements of
information exchanged.
Annex A defines the relationship of this standard with other related standardization work in
the manufacturing area.
The intent of Annex B is to present the business reasons for the information exchange
between business and control functions. The purpose is to establish a common terminology
for the reason for information exchange.
Annex C discusses the rationale for multiple models.
Annex D contains selected elements from the Purdue Reference Model that may be used to
place the functions described in Clauses 5 and 6 in context with the entire model.
Annex E is informative. It correlates the Purdue Reference Model to the MESA International
Model.
This standard is intended for those who are
– involved in designing, building, or operating manufacturing facilities;
– responsible for specifying interfaces between manufacturing and process control systems
and other systems of the business enterprise; or
– involved in designing, creating, marketing, and integrating automation products used to
interface manufacturing operations and business systems.
Annex F is a discussion of systems, resources, capability, capacity, and time as used in this
standard.
62264-1  IEC:2003(E) – 9 –
ENTERPRISE-CONTROL SYSTEM INTEGRATION –
Part 1: Models and terminology
1 Scope
This standard describes the interface content between manufacturing control functions and
other enterprise functions. The interfaces considered are the interfaces between Levels 3 and
4 of the hierarchical model defined by this standard. The goal is to reduce the risk, cost, and
errors associated with implementing these interfaces.
The standard can be used to reduce the effort associated with implementing new product
offerings. The goal is to have enterprise systems and control systems that inter-operate and
easily integrate.
The scope of this standard is limited to
a) a presentation of the scope of the manufacturing operations and control domain;
b) a discussion of the organization of physical assets of an enterprise involved in
manufacturing;
c) a listing of the functions associated with the interface between control functions and
enterprise functions; and
d) a description of the information that is shared between control functions and enterprise
functions.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 61512-1:1997, Batch control – Part 1: Models and terminology
ISO/IEC 19501-1, Information technology – Unified Modeling Language (UML) – Part 1:
Specification
ISO 10303-1:1994, Industrial automation systems and integration – Product data
representation and exchange – Part 1: Overview and fundamental principles
ISO 15531-1, Industrial automation systems and integration – Industrial manufacturing
management data – Part 1: General overview
ISO 15704:2000, Industrial automation systems – Requirements for enterprise-reference
architectures and methodologies
___________
To be published.
To be published.
– 10 – 62264-1  IEC:2003(E)
3 Terms and definitions
For the purposes of this document, the following definitions apply.
3.1
area
physical, geographical or logical grouping determined by the site
NOTE It can contain process cells, production units, and production lines.
3.2
available capacity
portion of the production capacity that can be attained but is not committed to current or
future production
3.3
bill of lading
BOL
contract or receipt for goods that a carrier agrees to transport from one place to another and
to deliver to a designated person or that it assigns for compensation upon the conditions
stated therein
3.4
bill of material
BOM
listing of all the subassemblies, parts, and/or materials that are used in the production of
a product including the quantity of each material required to make a product
3.5
bill of resources
listing of all resources and when in the production process they are needed to produce
a product
NOTE It is also a listing of the key resources required to manufacture a product, organized as segments of
production and is often used to predict the impact of activity changes in the master production schedule on the
supply of resources.
3.6
capability
ability to perform actions, including attributes on qualifications and measures of the ability
as capacity
NOTE See Annex F for additional background on this concept.
3.7
capacity
measure of the ability to take action, a subset of a capability
NOTE See Annex F for additional background on this concept.
EXAMPLE  Measures of the production rates, flow rates, mass or volume.
3.8
certificate of analysis
COA
certification of conformance to quality standards or specifications for products or materials
NOTE It can include a list or reference of analysis results and process information. It is often required for custody
transfer of materials.
62264-1  IEC:2003(E) – 11 –
3.9
committed capacity
portion of the production capacity that is currently in use or is scheduled for use
3.10
consumables
resources that are not normally included in bills of material or are not individually accounted
for in specific production requests
3.11
control domain
in this standard, control domain is synonymous with the manufacturing operations and control
domain
3.12
enterprise
one or more organizations sharing a definite mission, goals and objectives to offer an output
such as a product or service
3.13
equipment class
means to describe a grouping of equipment with similar characteristics for purposes of
scheduling and planning
3.14
finished goods
final materials on which all processing and production is completed
3.15
finished good waivers
approvals for deviation from normal product specifications
3.16
in-process waiver requests
requests for waivers on normal production procedures due to deviations in materials,
equipment, or quality metrics, where normal product specifications are maintained
3.17
manufacturing operations and control domain
MO&C
domain that includes all the activities in Level 3 and information flows to and from levels 0, 1,
and 2 across the boundary to Level 4
3.18
material class
means to describe a grouping of materials with similar characteristics for purposes of
scheduling and planning
3.19
material lot
uniquely identifiable amount of a material
NOTE It describes the actual total quantity or amount of material available, its current state, and its specific
property values.
3.20
material definition
definition of the properties and characteristics for a substance

– 12 – 62264-1  IEC:2003(E)
3.21
material sublot
uniquely identifiable subset of a material lot, containing quantity and location
NOTE This may be a single item.
3.22
personnel class
means to describe a grouping of persons with similar characteristics for purposes of
scheduling and planning
3.23
process segment
view of a collection of resources needed for a segment of production, independent of any
particular product at the level of detail required to support business processes that may also
be independent of any particular product
NOTE This may include material, energy, personnel, or equipment.
3.24
production capacity
ability of resources to perform production in the enterprise. The production capacity includes
the capacity of those resources and represents
a) the collection of personnel, equipment, material, and process segment capabilities;
b) the total of the current committed, available, and unattainable capacity of the
production facility;
c) the highest sustainable output rate that could be achieved for a given product mix, raw
materials, worker effort, plant, and equipment
3.25
production control
collection of functions that manages all production within a site or area
3.26
production line
series of pieces of equipment dedicated to the manufacture of a specific number of products
or families
3.27
production rules
information used to instruct a manufacturing operation how to produce a product
3.28
production unit
set of production equipment that converts, separates, or reacts one or more feedstocks to
produce intermediate or final products
3.29
product segments
shared information between a bill of resources and a production rule for a specific product
NOTE A logical grouping of personnel resources, equipment resources, and material specifications required to
carry out the production step.
3.30
resource
enterprise entity that provides some or all of the capabilities required by the execution of
an enterprise activity and/or business process (in the context of this standard, a collection
of personnel, equipment, and/or material)

62264-1  IEC:2003(E) – 13 –
3.31
unattainable capacity
portion of the production capacity that cannot be attained
NOTE Typically due to factors such as equipment unavailability, sub-optimal scheduling, or resource limitations.
3.32
work cell
dissimilar machines grouped together to produce a family of parts having similar manu-
facturing requirements
4 Enterprise-control system integration overview
4.1 Introduction
Successfully addressing the issue of enterprise-control system integration requires identifying
the boundary between the enterprise and the manufacturing operations and control domains
(MO&C). The boundary is identified using relevant models that represent functions, physical
equipment, information within the MO&C domain, and information flows between the domains.
Multiple models show the functions and integration associated with control and enterprise
systems.
a) Hierarchy models that describe the levels of functions and domains of control associated
within manufacturing organizations are presented in Clause 5. These models are based on
The Purdue Reference Model for CIM, referenced as PRM; the MESA International
Functional Model; and the equipment hierarchy model from IEC 61512-1.
NOTE 1 Selected elements of the Purdue Reference Model for CIM are included in Annex D.
NOTE 2 See the Bibliography for reference to the MESA white paper defining MES functionality.
b) A data flow model that describes the functional and data flows within manufacturing
organizations is given in Clause 6. This model is also based on The Purdue Reference
Model for CIM.
c) An object model that describes the information that may cross the enterprise and control
system boundary is given in Clause 7.
Domain Functions
Functions
descriptions in domains of interest
Information Categories Information
descriptions of information flows of interest
IEC  325/03
Figure 1 – Outline of models in the standard

– 14 – 62264-1  IEC:2003(E)
This standard provides models and information in multiple levels of detail and abstraction.
These levels are illustrated in Figure 1, which serves as a map to the rest of the document.
Each model and diagram increases the level of detail presented in the previous model.
The models start with a description of the domain of control systems and the domain of
enterprise systems. The domain discussion is contained in Clause 5.
Functions within the domains are presented in Clauses 5 and 6. Functions of interest that are
relevant to the standard are also given a detailed description in Clause 6. The information
flows of interest between the relevant functions are listed in 6.5.
The categories of information are given in 7.2. The formal object model of the information of
interest is presented in 7.5, 7.6, 7.7, and 7.8.
4.2 Criteria for inclusion in manufacturing operations and control domain
The hierarchy and data flow models describe most of the functions within a manufacturing
enterprise. Only some of those functions are associated with manufacturing control and
manufacturing control systems. The following list shows the criteria used to determine which
functions and which information flows are included in this standard.
a) The function is critical to maintaining regulatory compliance. This includes such factors as
safety, and compliance to environmental and current good manufacturing practices.
b) The function is critical to plant reliability
c) The life impacts the operation phase of the life of a facility, as opposed to the design,
construction, and disposal phases of the life of a facility.
d) The information is needed by facility operators in order to perform their jobs.
The information that flows between functions identified as being within the control domain
and those outside the control domain describe the enterprise-control system boundary.
Information exchanged between functions within the control domain and information
exchanged between functions outside the control domain are outside the scope of this
document. Figure 2 illustrates the enterprise-control system interface, as depicted in the data
flow model, between control and non-control functions; the blue circles indicate functions that
exchange information and are described in the data flow model. Functions depicted as white
circles and data flows depicted as dashed lines are those considered as outside the scope
of this standard.
Functions outside
the control domain
(for example, production
Information flows of interest
schelding)
(for example, production schedule
and production results)
Enterprise-control system boundary
Functions detailed
Functions not detailed
Data flows detailed
Functions within the control domain
(for example, equipment monitoring)
Data flows not detailed
IEC  326/03
Figure 2 – Enterprise-control system interface

62264-1  IEC:2003(E) – 15 –
5 Hierarchy models
5.1 Hierarchy model introduction
Clause 5 presents the hierarchy models associated with manufacturing control systems and
other business systems.
5.2 Scheduling and control hierarchy
5.2.1 Hierarchy levels
Figure 3 depicts the different levels of a functional hierarchy model: business planning and
logistics, manufacturing operations and control, and batch, continuous, or discrete control.
The model shows the hierarchical levels at which decisions are made. The interface
addressed in this standard is between Level 4 and Level 3 of the hierarchy model. This is
generally the interface between plant production scheduling and operation management and
plant floor coordination.
NOTE The figure is a simplified version of the Purdue Hierarchy Model, as shown in Figures D.1, D.2, D.3
and D.4 of Annex D.
Level 4
Business planning and logistics
Plant production scheduling,
operational management, etc.
Interface addressed
in this standard
Level 3
Manufacturing operations and control
Dispatching production, detailed production
scheduling, reliability assurance, etc.
Levels 2,1, 0
Batch Discrete
Continuous
control control control
IEC  327/03
Figure 3 – Functional hierarchy
Levels 2, 1, and 0 present the cell or line supervision functions, operations functions, and
process control functions and are not addressed in this standard. The discussion and labelling
of levels is based on a historical description, further described in Annex D. Level 0 indicates
the process, usually the manufacturing or production process. Level 1 indicates manual
sensing, sensors, and actuators used to monitor and manipulate the process. Level 2
indicates the control activities, either manual or automated, that keeps the process stable or
under control. There are several different models for the functions at these levels based on
the actual production strategy used.
5.2.2 Level 4 activities
Level 4 activities typically include
a) collecting and maintaining raw material and spare parts usage and available inventory,
and providing data for purchase of raw material and spare parts;
b) collecting and maintaining overall energy use and available inventory and providing data
for purchase of energy source;

– 16 – 62264-1  IEC:2003(E)
c) collecting and maintaining overall goods in process and production inventory files;
d) collecting and maintaining quality control files as they relate to customer requirements;
e) collecting and maintaining machinery and equipment use and life history files necessary
for preventive and predictive maintenance planning;
f) collecting and maintaining manpower use data for transmittal to personnel and
accounting;
g) establishing the basic plant production schedule;
h) modifying the basic plant production schedule for orders received, based on resource
availability changes, energy sources available, power demand levels, and maintenance
requirements;
i) developing optimum preventive maintenance and equipment renovation schedules in
coordination with the basic plant production schedule;
j) determining the optimum inventory levels of raw materials, energy sources, spare parts,
and goods in process at each storage point. These functions also include materials
requirements planning (MRP) and spare parts procurement;
k) modifying the basic plant production schedule as necessary whenever major production
interruptions occur;
l) capacity planning, based on all of the above activities.
5.2.3 Level 3
5.2.3.1 Level 3 activities
Level 3 activities typically include
a) reporting on area production including variable manufacturing costs;
b) collecting and maintaining area data on production, inventory, manpower, raw materials,
spare parts and energy usage;
c) the performance of data collection and off-line analysis as required by engineering
functions. This may include statistical quality analysis and related control functions;
d) carrying out needed personnel functions such as: work period statistics (for example, time,
task), vacation schedule, work force schedules, union line of progression, and in-house
training and personnel qualification;
e) establishing the immediate detailed production schedule for its own area including
maintenance, transportation and other production-related needs;
f) locally optimizing the costs for its individual production area while carrying out the
production schedule established by the Level 4 functions;
g) modification of production schedules to compensate for plant production interruptions that
may occur in its area of responsibility.
Descriptions of the major functionalities associated with these various activities are given in
5.2.3.2 through 5.2.3.12. The standard assumes all activities not explicitly presented as part
of the Level 3 control domain to be part of the enterprise domain. See Annex E for a
correlation of the activities to the MESA International Model.
5.2.3.2 Resource allocation and control
The control domain includes the functionality of managing resources directly associated with
control and manufacturing. The resources include machines, tools, labour skills, materials,
other equipment, documents, and other entities that are required for work to start and to be
completed. The management of these resources may include local resou
...