1.1 This standard applies to all electronic equipment installed on railway vehicles for control, adjustment, protection, power supply, etc., and related to the following items: a) Vehicle storage batteries; b) Low-voltage power sources with or without direct connection to the overhead contact line (mains transformer, voltage divider resistor, auxiliary power source) or sometimes without direct connection. However, electronic circuits covered by JIS E 5008 or JIS E 6402 are excluded. This standard covers the operating, design, manufacturing and test conditions for electronic equipment, and also covers the basic hardware and software requirements considered necessary for useful and reliable equipment. do. This standard may be supplemented with additional requirements from other standards or individual specifications, if justified. Specific requirements regarding the methods necessary to ensure the specified level of functional safety are specified in 4.6.3.1 and 4.6.3.2 and Annex A of IEC 62278. Software is considered to have an integrated safety level of 1 or higher only if: a) If there remains a risk related to safety. b) Must be performed by a programmable electronic system driven by software. In such cases (the software should have an integrated safety level of 1 or higher), IEC 62279 can be applied. For the purposes of this standard, electronic equipment is defined as equipment consisting primarily of semiconductor devices, devices, and related parts. These parts are mainly mounted on printed circuit boards. Remarks 1. Although the power device sensor (for detecting current, voltage, speed, etc.) and the printed circuit board for the drive unit are based on this standard, the power device drive unit as a whole complies with JIS E 5008. Or JIS E 6402 applies. 2. The corresponding international standards of this standard are shown below. The symbols representing the degree of correspondence are IDT (matched), MOD (modified), and NEQ (not equivalent) based on ISOI/IEC Guide 21. IEC 60571:1998 Electronic equipment used on rail vehicles (MOD)