Safety and Reliability 2.5. Electromagnetic compatibility 2.5.1. Definition Electromagnetic compatibility is the ability of a device to func- tion 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 cer- tain range occurs at the location of a given device. This noise depends on the exact location. It is determined 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 - Electrostatic discharge, ESD in accordance with IEC 801-2, 3rd degree of sharpness - Fast transient interference, Burst in accordance with IEC 801-4, 3rd degree of sharpness - Irradiation resistance of the device, HF in accordance with IEC 801-3, 3rd degree of sharpness - Immunity to damped oscillations in accordance with IEC 255-4 (1 MHz, 1 kV) 2 - 5