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Virtual Panel Event about Industrial Connectivity

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This 60-minute virtual panel discussion between industry experts will explore the intersection of connectivity (more)

UKIVA Machine Vision Conference



Join us on 15 July 2021 on the MVC Technology Presentation Hub and explore eight online seminar theatres. (more)

PPMA Show 2021

NEC, Birmingham(B40 1NT)

28/09/2021 - 30/09/2021

PPMA Show 2021 will be the UK’s largest ever event dedicated to state-of-the-art processing and (more)

Southern Manufacturing

Farnborough, Hants(GU14 6TQ)

06/10/2021 - 07/10/2021

Southern Manufacturing and Electronics is the most comprehensive annual industrial exhibition in the (more)

Advanced Engineering 2021

NEC Birmingham(B40 1NT)

03/11/2021 - 04/11/2021

Join us in our 12th and most important edition to date, as we invite engineers and management from all (more)

'Intelligent' input expansion unit maintains a PLd performance level

'Intelligent' input expansion unit maintains a PLd performance level

With the new Elobau interface, performance level "d" in accordance with EN ISO 13849-1 is still achieved when safety sensors are connected in series.

To ensure the safety of machines and systems, moveable guards such as doors and flaps are monitored with safety switches. To avoid having to wire them individually in the switch cabinet, an interface or an input expansion unit can be used. This means that only one cable is connected into the safety relay. In most input expansion units, all errors cannot be detected when this cascading process is utilised. This makes it difficult to achieve performance level "d" in accordance with safety standard EN ISO 13849-1.

For this reason, elobau has equipped the existing interfaces with "intelligence" in the form of control outputs. This allows each error to be reliably detected with an additional monitoring method even when series connection is applied. Thanks to the electronic monitoring of individual channels, even without the use of a standard PLC, performance level "d" can still be reached. The costs of the new interface and the additional measures are negligible compared to wiring the sensors individually.

The 'intelligent' interface enables the interconnection of up to four safety switches to one sensor input of the safety relay.


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