IEC 61131-1:2003(E) PROGRAMMABLE CONTROLLERS -Part 1: General information
1Scope
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(HMls)，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.
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