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ARTICLE

High-Integrity Series Connection

14 March 2013

With its new TR4 Direct safety sensors for doors and gates, Sick has solved the problem of cost-effective series connection of up to 30 switches, achieving PLe, Cat 4 integrity and full diagnostic coverage of an installation.

The sensors overcome the limitations on series connection imposed by the BS EN13849-1 and ISO/DIS14119.

Simplifying fault finding and trouble shooting, each sensor in a chain can indicate a fault, open or closed status and the current sensing range of the device. Each sensor can also indicate the status of the preceding sensor in the chain which allows quicker identification of an open switch or fault in the system.

The TR4 Direct is easily installed for simple series connection using standard M12 connection cables and M12 T connectors, saving time and money. The use of 24V DC dual channel outputs ensures the sensors have compatibility with many widely- used safety relays and PLCs. The large sensing range of 25mm overcomes door alignment and vibration problems which may affect other devices.
 
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