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The steady increase in the degree of automation in modern production systems is increasingly supported by identification systems. Their tasks are, for example, the control or release of production steps or the assignment of product-related information. Implementation is particularly simple if the RFID components are connected via the Fieldbus AS-Interface communicate. In the production of vacuum cleaner nozzles at Wessel-Werk allows the RFID technology by IFM Electronic a slim and transparent assembly supervision.
The world market leader Wessel-Werk develops and produces vacuum cleaner nozzles, which are characterized among other things by a quiet operation, low energy consumption and an optimal cleaning result. A high quality vacuum cleaner nozzle consists of more than a dozen different parts. In order to implement its innovative technologies in a timely and flexible manner, the company develops and builds its own assembly machines. In this workpiece carriers pass through several assembly stations on which different vacuum cleaner nozzles are assembled from chassis, brush strips, rollers and other parts.
At Wessel Werk, different variants are produced for flexible batch sizes in mixed operation. Conveyors transport the workpiece carriers to different processing stations. Depending on the nozzle type, different processing steps are carried out and corresponding conveying paths are used.
Identification rules out processing errorsEach workpiece carrier can be clearly identified via a special RFID code. The code is read out at each processing station and transmitted to the controller via the AS-Interface. Depending on the variant, the corresponding processing steps or the point setting take place on the conveying path. The unique identification reliably excludes machining errors in mixed operation.
Wessel-Werk relies on solutions from IFM Electronic, the world's first supplier of AS-i based RFID systems, in assembly technology. With the combination of RFID and AS-i, the automation provider offers an ideal combination for easy-to-implement identification tasks in assembly technology. "The commissioning of the system is much easier than expected because the read heads send the data immediately after installation and addressing to the PLC," says Gerhard Feyerabend, control technician at Wessel-Werk about the simplicity of the system. Another configuration is no longer necessary here.
RFID with AS-i ensures a smooth process flowFor a smooth process flow comes the industrial grade RFID system DTS125 used by IFM Electronic. It offers a compact and simple alternative for applications in which, for example, an optical identification due to environmental conditions can not be used. It is also the world's first RF identification system for AS-Interface. This opens up the possibility of reading out or describing code carriers (ID-TAG) and thereby taking advantage of the AS-Interface. In addition, it can be easily integrated into existing AS-i networks and is immediately ready for operation.
This AS-i solution provides easy wiring. Up to 100 read-write heads can be connected to 31 m AS-i cables. The cable can be branched as desired and follows the layout of the production line. It is very well suited for modular setups because both data and energy run on just one cable. The RF identification system uses the common AS-i analogue protocol 7.4 for data transfer when reading. Special software modules are therefore not required. The read / write head stores transmission errors that are retrievable for targeted error analysis.
Additional operating voltage not necessaryAntenna, electronics and AS-i interface are integrated in a compact housing. Power is supplied from the AS-i network via a rotatable M12 connector. There is no additional operating voltage required. This simplifies installation and minimizes wiring. The ID-TAG (transponder) is available in different designs and offers flexible mounting options for workpiece carriers, containers etc.
With simple penetration technology, the AS-i module can be connected to the yellow AS-i ribbon cable. The cable can be guided transversely or longitudinally through the module. The assembly of the AS-i module takes place without tools - only a screwdriver is required for disassembly.
In addition to RFID read / write heads, other sensors such as light barriers or inductive sensors can also be connected to the controller via AS-i modules. This also saves expensive wiring. The AS-i master collects head-to-head data for the common, higher-level fieldbuses. Thanks to the integrated PLC functionality, it can preprocess the data and relieve the higher-level system control.
Clever wiring with AS-Interface