Core contents of the standard: First, functional safety requirements, clarifying the functional safety level requirements of elevator functional safety fieldbus, stipulating the division and application requirements of safety integrity level (SIL), ensuring that the fieldbus system can safely enter the predetermined safe state when a fault occurs; Second, communication protocol specification, unifying the communication protocol requirements of elevator functional safety fieldbus, stipulating data transmission format, communication rate, error detection and correction mechanism, real-time requirements, etc., ensuring the reliability and real-time performance of communication; Third, system architecture requirements, clarifying the architecture requirements of functional safety fieldbus systems, including bus topology, node design, redundant design, fault diagnosis and isolation requirements, etc., to improve the reliability and availability of the system; Fourth, test and verification requirements, stipulating the test methods, test items and acceptance standards of functional safety fieldbus systems, including functional test, performance test, safety test, electromagnetic compatibility test, etc., to ensure that the system meets the functional safety requirements; Fifth, engineering application specifications, clarifying the design, installation, commissioning, maintenance and management requirements of functional safety fieldbus systems in elevator engineering, providing technical guidance for engineering applications.