Introduction into IEC 61131-2 Equipment Requirements and Tests

Scope

1. This International Standard specifies requirements and related tests for programmable controllers (PLC) and their associated peripherals {e.g., 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.
   
2. 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.
   
3. This standard also applies to any products performing the function of PLCs and/or their associated peripherals.
4. Equipment covered in this standard is intended for use in overvoltage category II (IEC 60664-1) in low voltage installations, where the rated mains supply voltage does not exceed AC 1000Vr.m.s. (50/60 Hz), or DC 1500V. {If PLCs or their associated peripherals are applied in overvoltage category III installations, then additional analysis will be required to determine the suitability of the equipment for those applications.}
   
5. 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.
   
6. 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.
   

Object of the Standard

The purposes of this standard are:

• To establish the definitions and identify the principal characteristics relevant to the selection and application of PLCs and their associated
  peripherals;
• To specify the minimum requirements for functional, electrical, mechanical, environmental and construction characteristics, service conditions, safety, EMC, user programming and tests applicable to PLCs and the associated peripherals
  

Object of This Part

This part specifies:

1. service, storage and transportation requirements for PLCs and their associated peripherals;
2. functional requirements for PLCs and their associated;
3. EMC requirements for PLCs and their associated peripherals;
4. safety requirements for PLCs and their associated;
5. information that the manufacturer is required to supply;
6. test methods and procedures that are to be used for the verification of compliance of PLCs and their associated peripherals with the requirements.

The tests are type tests or production routine tests, and not tests related to the ways PLC systems are applied.