IEC 61131-1 pdf download

IEC 61131-1 pdf download Programmable controllers – Part 1 : General information
1 Scope
This Part of lEC 61131 applies to programmable controllers (PLC) and their associated peri-pherals such as programming and debugging tools (PADTs), human-machine interfaces(HMIs)，etc.，which have as their intended use the control and command of machines andindustrial processes.
PLCs and their associated peripherals are intended to be used in an industrial environmentand may be provided as open or enclosed equipment. lf a PLC or its associated peripherals areintended for use in other environments，then the specific requirements，standards andinstallation practices for those other environments must be additionally applied to the PLCand its associated peripherals.
The functionality of a programmable controller can be performed as well on a specific hardwareand software platform as on a general-purpose computer or a personal computer with industrialenvironment features.This standard applies to any products performing the function of PLCsand/or their associated peripherals. This standard does not deal with the functional safety orother aspects of the overall automated system.PLCs， their application programme and theirassociated peripherals are considered as components of a control system.
Since PLCs are component devices， safety considerations for the overall automated systemincluding installation and application are beyond the scope of this Part. However, PLC safety asrelated to electric shock and fire hazards, electrical interference immunity and error detectingof the PLC-system operation (such as the use of parity checking, self-testing diagnostics,etc.),are addressed.Refer to lEc 60364 or applicable national/local regulations for electrical instal-lation and guidelines.
This Part of lEC 61131 gives the definitions of terms used in this standard. lt identifies theprincipal functional characteristics of programmable controller systems.
2Normative references
The following referenced documents are indispensable for the application of this document. Fordated references,only the edition cited applies.For undated references,the latest edition ofthe referenced document (including any amendments) applies.
IEC 61131-2,Programmable controllers – Part 2: Equipment requirements and tests1IEC 61131-3:2003,Programmable controllers – Part 3: Programming languages
3Terms 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 theintended 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 lEC 61131, in which PLC-systems are incorporated by orfor the user, but which also contains other components including their application programmes
3.3
field device
catalogued part to provide input and/or outputinterfaces or to provide data pre-processing/post-processing to the programmable controller system.A remote field device mayoperate autonomously from the programmable controller system. It can be connected to theprogrammable controller using a field bus
3.4
ladder diagram or relay ladder diagram
one or more networks of contacts，coils，graphically represented functions，function blocks,data elements，labels,and connective elements，delimited on the left and (optionally) on theright by power rails
3.5
programmable (logic) controller(PLC)
digitally operating electronic system, designed for use in an industrial environment,which usesa programmable memory for the internal storage of user-oriented instructions for implementingspecific functions such as logic，sequencing，timing，counting and arithmetic,to control,through digital or analogue inputs and outputs，various types of machines or processes.Boththe PLC and its associated peripherals are designed so that they can be easily integrated intoan industrial control system and easily used in all their intended functions
NOTE The abbreviation PLC is used in this standard to stand for programmable controllers，as is the commonpractice in the automation industry. The use of PC as an abbreviation for programmable controllers leads toconfusion with personal computers.