User's Manual

2 – 3

BL ident System – Planning

D101583 0207 BL ident

Transfer zone and read-write distance

The read-write head generates an alternating inductive field. The

recommended read-write distance results from the combination of

data carrier and read-write head. The appearance of the distribution

of this field depends on the design of the antenna in the data carrier

and in the read-write head.

Exchange of data is only possible within the transfer zone (Fig. 1)

with the parameters L

= length of the transfer zone and S

recommended write-read distance. The transfer zone reduces when

the distance from the data carrier to the read-write head increases

and is reduced to a point at the threshold distance H, i.e. as the

distance increases less data can be transferred or the speed at

which the read-write head moves past the data carrier must be

reduced.

Figure 1

Transfer zone

Note

Using the BL ident configurator at www.turck.com allows the

relationships to be simulated.