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BL ident System – Planning
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Dwell time of the data carrier T
d
The dwell time T
d
is the time in which the data carrier is present in
the transfer zone of the read-write head as it passes by. The read-
write head exchanges data with the data carrier during this time.
write head exchanges data with the data carrier during this time.
The dwell time T
d
is calculated as follows:
T
d
= L
Sr
/ V
Tag
where:
L
Sr
:length of the transfer zone
V
Tag
:speed of the data carrier in dynamic operation
In static mode the dwell time can be as long as necessary. The dwell
time must be long enough to ensure that communication with the
data carrier has been completed.
time must be long enough to ensure that communication with the
data carrier has been completed.
In dynamic operation the dwell time is defined by the system
environment. The dwell time must be matched to the data quantity
to be transferred. Conversely, this means that the shorter the dwell
time, the lower the quantity of data to be transferred.
environment. The dwell time must be matched to the data quantity
to be transferred. Conversely, this means that the shorter the dwell
time, the lower the quantity of data to be transferred.
Calculation of the maximum quantity of user data in dynamic operation
The calculation of the maximum user data quantity is dependent on
the read-write head used and the corresponding data carrier.
the read-write head used and the corresponding data carrier.
Example:
Read-write head: TB-M18-H1147,
Data carrier: TW-R30-K2
Pass speed: 0.5 m/s
Note
At www.turck.com various examples relating to this topic can be
examined with the BL ident configurator.
examined with the BL ident configurator.