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Introduction into IEC 61131-1
General Information
Scope
The International Standard IEC 61131 applies to programmable controllers
(PLC) and their associated peripherals such as programming
and debugging tools (PADTs), Human-machine interfaces (HMIs),
etc. which have as their intended use the control and command
of machines and industrial processes.
PLCs and their associated peripherals are intended to be
used in an industrial environment and may be provided as
open or enclosed equipment. If a PLC or its associated peripherals
are intended for use in other environments, then the specific
requirements, standards and installation practices for those other environments
must be additionally applied to the PLC and its associated peripherals.
The functionality of a programmable controller can be performed
as well on a specific hardware and software platform as on
a general-purpose computer or a personal computer with industrial
environment features. This standard applies to any products
performing the function of PLCs and/or their associated peripherals.
This standard does not deal with the functional safety or
other aspects of the overall automated system. PLCs, their application program
and their associated peripherals are considered as components of a control
system.
Since PLCs are component devices, safety considerations for
the overall automated system including installation and application
are beyond the scope of this standard. However, PLC safety
as related to electric shock and fire hazards, electrical
interference immunity and error detecting of the PLC-system
operation (such as the use of parity checking, self-testing
diagnostics, etc.), are addressed. Refer to IEC 60364 or
applicable national/local regulations for electrical installation
and guidelines.
This part of IEC 61131 gives the definitions of terms used
in this standard. It identifies the principal functional
characteristics of programmable controller systems.
TABLE OF CONTENT - IEC 61131-1
(incl. page number)
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FOREWORD
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10
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INTRODUCTION
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12
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1
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Scope
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13
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2
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Normative references
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15
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3
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Definitions
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17
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4
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Functional characteristics
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35
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4.1
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Basic functional structure of a programmable controller system
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35
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4.2
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Characteristics of the CPU function
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43
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4.2.1
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Summary
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43
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4.2.2
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Operating system
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43
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4.2.3
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Memory for application data storage
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44
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4.2.4
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Execution of the application program
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44
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4.3
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Characteristics of the interface function to sensors and actuators
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45
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4.4
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Characteristics of the communication function
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45
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4.5
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Characteristics of the human-machine interface (HMI) function
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46
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4.6
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Characteristics of the programming, debugging, monitoring, testing
and documentation functions
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46
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4.6.1
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Summary
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46
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4.6.2
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Language
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46
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4.6.3
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Writing the application program
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47
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4.6.4
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Automated system startup
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47
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4.6.5
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Documentation
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48
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4.6.6
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Application program archiving
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48
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4.7
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Characteristics of the power supply functions
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49
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5
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Availability and reliability
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49
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