IEC 61131-1:2003 pdf free download

IEC 61131-1:2003 pdf free download Programmable controllers – Part 1 : General information
1 Scope
This Part of IEC 61 1 31 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 programme 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 Part. 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 61 1 31 gives the definitions of terms used in this standard. It identifies the principal functional characteristics of programmable controller systems.
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 61 1 31 -2, Programmable controllers – Part 2: Equipment requirements and tests 1
IEC 61 1 31 -3:2003, Programmable controllers – Part 3: Programming languages
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
application programme or user programme
logical assembly of all the programming language elements and constructs necessary for the intended signal processing required for the control of a machine or process by a PLC-system
3.2
automated system
control system beyond the scope of IEC 61 1 31 , in which PLC-systems are incorporated by or for the user, but which also contains other components including their application programmes