RFID 125 kHz - System description

  • Industrially compatible identification system in 125 kHz technology.
  • Coding of workpiece carriers in routing conveyors.
  • Quick and easy set-up: Plug & Play.
  • Read/write head requiring little space due to narrow design.
  • Compact and at a low cost: Antenna and evaluation in one housing.

Introduction
The constant increase of the degree of automation in modern production plants is increasingly supported by identification systems. Their tasks include for example the control or release of production steps or the assignment of information about each product. The RF identification system from ifm electronic is a compact and easy alternative for applications in which for example optical identification is not possible due to the ambient conditions. It is also the first RF identification system for AS-interface worldwide. It allows reading and writing of code carriers (ID tags), benefiting from the advantages of AS-interface. It can be integrated into existing AS-I networks without problem and is immediately ready for operation. For reading, the RF identification system uses the AS-i analogue protocol 7.4 for data transfer. Special software modules are not required. Up to 31 read/write modules can be connected to one AS-i master. The read/write head stores transmission errors which can be retrieved for a targeted fault analysis. Antenna, electronics and AS-i interface are integrated in a compact housing. The voltage is supplied via the AS-i network via a rotatable M12 connector. No additional operating voltage required. The ID tag (transponder) provides flexible mounting options for workpiece carriers, tanks etc. The code length is 15 bits.

Operating principle
The RFID system (Radio Frequency IDentification) from ifm electronic generates a 125 kHz electromagnetic field for reading and writing of data. The electromagnetic field emitted by the antenna induces voltage in the passive ID tag (transformer principle). This activates the ID tag (transponder) which returns its code. Processing of the code and transmission to the AS-interface are carried out in the read/write head. Advantages: Reliable data transfer in dynamic reading processes and very small ID tags. The read/write heads exchange data with the passive ID tags at a maximum distance of 20 mm. The ID tag provides flexibility for different types of mounting. The ID tag is mounted to tanks or workpiece carriers – in the tag fixture or alternatively by direct mounting using an M5 grub screw.

More information

System overview — RFID 125 kHzProduct Innovations — RFID 125 kHz


The read/write heads exchange data with the passive ID tags at a maximum distance of 20 mm. The ID tag provides flexibility for different types of mounting.


The ID tag is mounted to tanks or workpiece carriers – in the tag fixture or alternatively by direct mounting using an M5 grub screw.