AS-Interface - Inductive detectors 6Inductive AS-Interface Sensors

In previous system concepts with conventional wiring, the detection of sensor defects was difficult and would often lead to prolonged machine downtimes.In a modern system concept, integrated chips provide sensors with "intelligence" and extend their functional-ity. The sensors have an independent self-monitoring and cable monitoring function, and can output data messages to a higher-level unit, e.g. to a PLC.
® Rectangular sensors are available as surface-mount-ing sensors or in VariKont
® , VariKont M
® and VariKont L
Masters and GatewaysPower Supplies, Extender, RepeatersSafety at workI/O ModulesControl cabinetI/O ModulesField applicationAnalogue modulesOther modules ® housings. The VariKont L
® housing is of particular interest. The sensor head is convertible and may be rotated in 15° steps. It is fastened using 2 screws, which are also used to mount the sensor. This sensor has been de- veloped specifically for conveying applications.The VariKont Pre-fault indication Manufacturer of oscillator monitoring In practice, inductive sensors are set so that the dis-tance between the object and the sensor corresponds to approximately 50% of the maximum operating range. The pre-fault indication is activated if the object is only active in an area between 80% and 100% of the maximum operating range. It indicates that the sensor is out of range. The advantage of this is that the mes- sage is made available before the sensor fails. During oscillator monitoring, the oscillator coil is mon-itored in order that a fault in the coil, such as an open circuit, can be detected and indicated.The 4 data bits in the messages also contain informa-tion about the status of the N.C/N.O. contacts of the sensor, which can be modified if required by transfer-ring the appropriate parameter:31 or 62 of these intelligent sensors can be connected in a single AS-Interface network per master. Various types of sensors are available from Pepperl+Fuchs. Types
® and VariKontM
® housings correspond to the mounting slot requirements of EN60947 for me-chanical roller rocker end switches. They also permit the rotation of the sensor heads. The VariKont Embeddable and built in flush cylindrical sensors are available in diameters M12 to M30. Conventional sen-sors in stainless steel head ferrules with 2 mm round cable or V1 plug connection with multiple Led display are available as standard.
® hous-ing permits the head to be rotated in 90° steps, the Va-riKont M
® housing in 15° steps. A special base (U9A) is available for the VariKont
® housing, which enables direct connection to the AS-Interface flat wiring using the cable-piercing technique.N.C. contactN.O. contact Parameter
Inductive sensorsPhotoelectric sensorsRotary encodersAccessories Issue date 2004-11-19 - Catalogue AS-Interface 2004/2005 Subject to reasonable modifications due to technical advances.Copyright Pepperl+Fuchs, Printed in Germany Pepperl+Fuchs Group • Tel.: Germany +49 621 776-0 • USA +1 330 4253555 • Singapore +65 67799091 • Internet http://www.pepperl-fuchs.com

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