Simplifying predictive maintenance with smart diagnostic buses

Integration, networking, and linking are important trends in automation technology. Both a machine’s manufacturer and user can reap the benefits of digitisation, such as increased productivity, easy adaptation to individual requirements, and improved error diagnosis. The Schmersal Group will be showcasing innovations in safety-oriented networking at SPS.

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For many decades, there was only one decision that needed to be made when integrating safety switchgear devices into a machine's safety circuit: whether to use series wiring or parallel wiring. There is now a range of additional options for networking and integration, including fail-safe bus systems, safety fieldboxes, and diagnostic fieldboxes. Designers now have a much wider selection to choose from and consider what's important.

Tried and tested, and good: The safety bus

Safety bus systems are one of the solutions that have endured the test of time. A widely used system is the AS-Interface Safety at Work (ASi SaW). Many device series from Schmersal are available with integrated connections for this bus system; the others can be connected via separate interface modules.

Benefits of this system include the capability to transmit operational and safety signals via yellow ASi flat-ribbon cables. For system manufacturers, this means reduced installation effort and more flexible configuration, while for operating companies, it means a more comprehensive evaluation of the operating states of safety switchgear devices.

The AS-i-Safety standard enables speedy installation with minimal wiring effort and maximum flexibility, allowing for seamless integration in the event of system changes or new safety requirements. Another advantage is the comprehensive range of diagnostic functions. These make rapid identification of the source of error in the event of irregularities or faults. This is especially useful when dealing with large, complex systems, as it can dramatically reduce downtime. However, a safety bus might provide advantages for compact machinery with only a few safety switchgear devices and functions.

Continuous communication from the switchgear to higher levels