1 Scope
This standard applies to all electronic equipment for control, regulation, protection,
supply, etc., installed on rail vehicles and associated with:
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- either the accumulator battery of the vehicle;
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- or a low voltage power supply source with or without a direct connection to the contact
system (transformer, potentiometer device, auxiliary supply);
with the exception of electronic power circuits, which conform to EN 50207.
This standard covers the conditions of operation, design, construction, and testing
of electronic equipment, as well as basic hardware and software requirements considered
necessary for competent, reliable equipment.
Additional requirements in other standards or individual specifications may complement
this standard, if they are justified.
Specific requirements related to practices necessary to assure defined levels of functional
safety are to be determined in accordance with 4.6.3.1 and 4.6.3.2 of EN 50126 and its informative Annex A.
Software safety integrity level of 1 or higher shall only be considered when it is
shown that a residual safety risk remains and that it has to be carried by the software
driven programmable electronic system. In such a case (i.e. software safety integrity
level 1 or higher), EN 50128 is applicable.
For the purpose of this standard, electronic equipment is defined as equipment mainly
composed of semiconductor devices and recognized associated components. These components
will mainly be mounted on printed boards.
NOTE Sensors (current, voltage, speed, etc.) and firing unit printed board assemblies for power electronic devices are covered by this standard. Complete firing
units are covered by EN 50207.