Reliability, Safety 2.5 Electromagnetic compatibility 2.5.1 Definition Electromagnetic compatibility is the ability of a device to function satisfactorily in its electromagnetic environment without itself causing any electromagnetic interference that would be intolerable to other devices in this environment Of all known phenomena of electromagnetic noise, only a certain range occurs at the location of a given device. This noise depends on the exact location. It is defined in the relevant product standards.
The international standard regulating construction and degree of noise resistance of programmable logic controllers is IEC 1131-2 which, in Europe, has been the basis for European standard EN 61131-2. 2.5.2 Resistance to interference Ш Electrostatic discharge, ESD in acc. with EN 61000-4-2, 3 Ш Irradiation resistance of the device, HF in acc. with EN 61000-4-3, 3rd degree of sharpness rd degree of sharpness Ш Fast transient interference, burst in acc. with EN 61000-4-4, 3rd degree of sharpness Ш Immunity to damped oscillations in acc. with EN 61000-4-12 (1 MHz, 1 kV) 13