GB/T 20438.3-2006

This standard specifies software safety lifecycle requirements for electrical, electronic, and programmable electronic systems performing safety functions. It is applied in industries such as industrial automation, process control, machinery, and automotive manufacturing to ensure that software development, verification, and validation activities meet defined safety integrity levels (SILs). The standard is used by engineers and procurement professionals to specify, design, and assess software for safety-critical applications like emergency shutdown systems, robot controllers, and automotive electronic controls.