IEC 61131-2:2007 specifies requirements and related tests for programmable controllers (PLCs) and their associated peripherals (for example, 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. It establishes the definitions and identifies the principal characteristics relevant to the selection and application of PLCs and their associated peripherals. It specifies 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. This third edition of IEC 61131-2 cancels and replaces the second edition published in 2003 and constitutes a technical revision. This third edition includes the following technical changes: - Correction of the tests of Clause 6 and 9; - Change of EMC requirements in Clause 8; - New organization of Clause 11. This bilingual version (2012-05) corresponds to the monolingual English version, published in 2007-07.