Nuclear security level DCS platform security display control station and user login method

The safety display control system serves as an important system for man-machine interaction of a main control room of the nuclear power plant and mainly executes important safety functions of the nuclear power plant, such as bypass operation and shutdown circuit breaker reset. According to IEC628596.4. 2a) requirements: for an HMI (Human Machine Interface) of a digital instrument control system, if rapid access of an operator is needed due to power plant safety, password-based access control should not be adopted, and other access control means can be adopted, and access of manipulating HMI software is limited. A security display control station (SVDU) of a nuclear power plant security level DCS platform does not adopt a password means for access control due to the execution of security level control, but a project designer needs to add a login entry and related display in an HMI picture of the SVDU from the perspective of information security. Therefore, the invention provides a design scheme meeting the req