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Consider the General Notes on the Information in the Pepperl+Fuchs Product Catalogs
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Copyright Pepperl+Fuchs
16.08.12
Identification Systems
8.1
Introduction
Automatic object identification has become an integral part of industrial
manufacturing. RFID (Radio Frequency Identification) links together
the data and material flow during manufacturing processes, including
inventory control, warehouse management, theft protection systems,
or product piracy protection systems. It is also for management supply
chain. As a system provider, Pepperl+Fuchs has over 20 years of
experience and offers a wide range of products as well as excellent
programming and commissioning support.
The IDENTControl system by Pepperl+Fuchs can control read heads in
the frequency ranges
•
Low Frequency (LF) 125 kHz
•
High Frequency (HF) 13.56 MHz
•
Ultra High Frequency (UHF) 868 MHz
using just one control interface.
Systems operating in the 125 kHz (LF) frequency range are used in
metallic surroundings and for installation in metal.
Systems operating in the 13.56 MHz (HF) frequency range are used for
Smart Label tags. Systems in the LF and HF frequency ranges work at
close range using inductive coupling and provide operating distances of
less than half a meter.
UHF systems in the 868 MHz frequency range cover larger operating
distances.
RFID is essential for many types of production processes since
manufacturers are increasingly demanding the level of traceability that
can be achieved with RFID.
RFID offers excellent data security, data hold times, and read rates.
Encapsulated tags can withstand dirt, water, or mechanical effects. An
EEPROM chip or an FRAM memory bank is used as a storage medium
in the tag.
The IDENT
Control
interface is compatible with all common interfaces
(
PROFIBUS, Ethernet, INTERBUS, DeviceNet, CC-Link and serial).The
user concept and set of commands are almost identical.
Our devices are approved in accordance with R&TTE.
8.2
Programming an RFID System
Components of an identification system
Identification systems usually consist of a control interface, read/write
heads, and tags. The tags are divided into:
•
Read-only tags contain a globally unique read only code (UID),
usually 40, 64, or 96 bits that cannot be changed.
•
Read/write tags with an additional memory area that can be freely
used and overwritten many times. The size of the writable memory
bank is between 1 kBit and 64 kBit.
Read/write heads, controlled by system commands, read released data
and write data areas. The functionality of the evaluation unit with an
interface to the higher-level fieldbus is defined by a software program in
the control unit.The evaluation unit enables internal communication and
provides the power for the read/write heads. The read/write heads are
connected to the evaluation unit by a shielded M12 connecting cable.
Systems with several hundred read/write points (ID points) can be set
up using the fieldbus and the corresponding number of evaluation units,
and they can be connected to a control unit.
System selection
criteria
Number of read/write cycles
Passive read-only and read/write tags can be read as often as required
and have an almost unlimited service life. Read/write tags on an
EEPROM basis, however, can be written to only a limited number of
times (usually 100,000 times). In contrast, FRAM read/write tags can be
read and written to an unlimited number of times.
Data processing
During programming it should be ensured that the data being read can
also be collected by the higher-level system. The number of read points,
quantity of data, and repeat rate must be taken into consideration and
reconciled with the performance of the fieldbus system.
Read/write distances and tolerances
The read/write distances are specified in the data sheets.Communication
should typically take place within 30% and 80% of the maximum read
area.
Housing designs for read/write heads and tags
The most suitable housing design can be selected from a wide range
of products, depending on the application. Generally speaking, a larger
housing design usually also provides larger read ranges but should still
be a similar size to the tag.
Maximum passing speed
Specific minimum times are required to detect the tag and read the
data. The amount of time that the tag spends in the read area is longer
with large read/write heads, which enables faster passing speeds.
The recommended range (30 to 80% of the maximum read distance)
indicates the read range that can be used reliably.
Cable routing and grounding
Signal lines are shielded because they are especially sensitive
to external electromagnetic fields. Lines to heavy consumers
and high-frequency system lines must not be positioned parallel
to the data line and there must be a sufficient safety distance.
8.3
RFID Handheld Devices
Product description
Our handheld devices represent a mobile extension of the IDENT
Control
system. RFID handheld devices are available for LF and HF tags. The
read data can be stored in the device and assigned a prefix, suffix,
timestamp, and checksum, enabling the devices to be safely integrated
into logistics and production processes.
LC display and keyboard
The design is similar to that of a cell phone and is intuitive to use. The
handheld device has a keyboard and a multiline display.
Application-specific functions
The JavaScript programming language is used to control the display,
execute all the commands in a routine, and assign soft keys. If you
wish to configure your own interface for the device, please contact
Identification Sytems RFID
8
Identification Systems RFID,
Control Interfaces
8
.1
Identification Systems RFID,
Heads and Transponders
8
.2
Identification Systems RFID,
Handheld
8
.3
Identification Systems RFID,
Accessories
8
.4
