System solutions from Schmersal for functional safety can be individually adapted, offer easy and fail-safe installation and minimise the effort needed for wiring. The new Safety Fieldbox with PROFINET/PROFIsafe interface is a plug and play solution offering a high degree of flexibility: all common types of safety switchgear can be connected. Schmersal offers a wide range of safety switches with integrated AS-Interface Safety at Work interface, which can be easily networked with each other via this safety bus system. The AS-i system is very flexible, because the configuration can be easily changed even on existing machines.The SD bus (SD = serial diagnostics) offers cost-efficient safety solutions. The SD interface allows mixed systems of sensors and interlocks. The diagnostics data from series-connected safety switchgear are transmitted to a higher-level field bus system. The SD interface system helps to implement predictive maintenance concepts.