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. This third edition includes the following significant technical changes with respect to the previous edition: DC power port requirements have been moved from Clause 8 to Clause 5, Correction of the tests of Clause 6, Change of EMC requirements in Clause 8, Correction of the tests in Clause 9, New organization of Clause 11.