Radio Profiles And Their Effects - Balluff BIS U-4A7-082-01C-07-S4 Betriebsanleitung

BIS U-4A7-082- _1C-07-S4
Industrial RFID system - Read/write head
5
Application planning (continued)
In addition to the travel path through the detection range,
the data transmission speed between the read/write head
and the data carrier can be varied by selecting a suitable
radio profile (see chapter 5.13 on page 19).
Access times for the detection of data carriers
Tab. 5-1 shows typical access times for the detection of
one to ten data carriers in order to simplify system design
for dynamic applications. It must be noted that the access
times and the IO-Link data transfer depend on various
parameters as well as the IO-Link master used.
The Detect data carrier command (command identifier
0x47) was used for detection.
PROFINET
CIFX 50E-RE BNI PNT-508-105-Z015
Fig. 5-14: Access time measurement setup
Number Measured time
of data duration for data
carriers carrier detection
(typical) [ms]
1 20
2 29
3 43
4 54
5 85
6 98
7 117
8 128
9 137
10 150
Tab. 5-1: Typical access times for the detection of 1...10 data
carriers (EPC 12 bytes)
The middle column shows the access time required by the
read/write head for pure detection. Data carriers must be
in the detection range of the read/write head for at least
the specified time in order to be detected. In dynamic
applications, the traversing speed must be set so that
sufficient time is available for detection.
The right column shows the times including data
transmission to the IO-Link master. These times depend
on the IO-Link master used and the set cycle time.
To detect the presence of data carriers in the
shortest possible cycles, the Number of data
carriers command (command identifier 0x55)
can also be used, which requires less data to
be transferred (see chapter 8.7 on page 44).
The access times were determined under the following
boundary conditions:
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IO-Link
BIS U-4A7-082-01C-07-S4
Measured time
duration for
detection including
data transmission
(typical) [ms]
194
200
234
312
324
342
350
380
434
460
IO-Link master BNI PNT-508-105-Z015
Data carrier BIS U-100-01/CA
EPC length 12 bytes
Radio profile Profile no. 4 (TX: 40 kbit/s,
RX: 40 kBit/s, Miller-4)
Initial Q-value 1
The Q-value is a value that is used for internal
processing in order to address data carriers in a
staggered manner in multi-tag operation.
Detailed information on the Initial Q value
parameter can be found in chapter 8.3.1 on
page 28.
For details on radio profiles, see chapter 5.13
on page 19.
5.13

Radio profiles and their effects

The read/write head offers the option of setting various
radio profiles. These can be used to influence various
properties of the radio link between the data carrier and
the read/write head:
– TX data rate from read/write head to data carrier
– RX data rate from data carrier to read/write head
– RX coding and RX link frequency
Setting the radio profiles is not necessary for
most applications. The preset radio profile
normally leads to good results. Only in
environments with high EMC loads or in very
fast dynamic applications can the radio profile
be optimized within certain limits.
Detailed information on tag codings can be
found in the UHF RFID standards
ISO/IEC 18000-63 and EPCglobal
Class 1 Generation-2.
TM
english 19