Page 921 - Sensors and Systems - North American Catalog
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Identification Systems
Introduction
Industrial Bus Connections
All bus connections are integral to IDENT
Control
. Just choose an interface,
read head, and cable and you are done. All common industrial networking
solutions are available: Ethernet, DeviceNet, PROFIBUS, CC-Link, and
RS-232. The Ethernet interface will support multiple protocols, including
EtherNet/IP, PROFINET, PCCC for SLC5/05 and PLC5 messaging, Modbus/
TCP, and TCP/IP. IDENT
Control
also supports the real-time EtherCat
Ethernet protocol. Protocol switching is automatic.
EtherNet/IP
The Ethernet interface supports EtherNet/IP right out of the box. With
implicit messaging, the data is directly mapped just like any other I/O card.
No expensive configuration software is required for setup. Everything is
programmed using the RSLogix 5000 programming software.
DeviceNet
Because the DeviceNet current consumption is only 40 mA you can run 500
ft of DeviceNet cable with more then 84 read heads attached to it. DeviceNet
also has automatic node replacement. With this feature, all parameters are
downloaded to the interface on power up. These parameters may include
the assembly instances, tag type of each head and multiplex mode.
PROFIBUS
Many PLCs use PROFIBUS as their high-speed bus connection. Various
models are available that allow quick field or enclosure mounting.
Parameterization is automatic, and the diagnostic interrupt allows signaling
of the master system when an error occurs. Any type of read head connects
directly to the IDENTControl interface.
CC-Link
This common upper-level bus system is used almost exclusively by
Mitsubishi PLCs. These controllers also support CC-Link V2. This newer
specification allows extended cyclic settings resulting in a large data map
making it easier and faster to read and write large amounts of information to
the RFID system.This two-head controller communicates to both read/write
heads simultaneously and incorporates a new advanced RFID protocol.
This powerful protocol gives positive feedback to the user when a new tag
has arrived and allows for large read/write data blocks that are limited only
by the read/write head’s internal memory size.
PROFINET
PROFINET is a real-time industrial network with a fast RT (real time)
protocol. It communicates on the MAC level, making the packets small and
compact and, of course, extremely fast. The IP address of these devices
does not matter. Instead, every device is assigned a PROFINET name.
The network neighborhood function allows the master to know how each
device is connected relative to one another. This allows a failed device to be
removed and replaced with a new one without any extra user configuration.
This reduces downtime and allows a potentially inexperienced maintenance
crew to take care of the system.
SLC 5/05 and PLC 5
Read/Write Operation
The SLC5/05 Ethernet processor and the PLC5/xxE Ethernet processors
do not use standard EtherNet/IP protocol, but a protocol called PCCC.
This protocol is fully supported and two rungs of ladder will get you up and
running quickly.
Modbus/TCP
Many PLCs, such as Schneider Electric and GE, will support the Modbus/
TCP protocol. This protocol supports multiple simultaneous users: For
instance, one PLC can control four heads or four PLCs can each control
one head. This reduces the overall cost of the installation. The interface is
protected against dual head write access.
TCP/IP
Standard socket connections to port 10000 will allow you to send and receive
data to IDENT Control. An integrated Web server makes configuration,
setup and testing easy and with the integrated SMTP server emails are sent
on error or data.
EtherCAT
EtherCAT is another industrial Ethernet protocol designed for drives, IO, and
RFID. This Ethernet network is essentially a ring of data. One large packet
is sent out with every device’s I/O included in it. The individual devices pull
out the inputs and set the required outputs. This exchange of IO data takes
only a few nanoseconds per device. No IP address or name is required
for these devices. The location of a device within the string of EtherCAT
devices determines devices are set up and how that device will operate on
the network. Like PROFINET, a failed device can be removed and a new
device installed without ever configuring it.
Read/write heads
With IDENT
Control
, all heads are read/write. There are no worries about
purchasing the wrong head style so inventories are significantly reduced.
Different housing designs are available for your application requirements.
All read heads fit and work on any IDENT
Control
interface.
How Do I Choose the Correct Head?
The first factor is the frequency. If you have chosen a tag then select a read
head with the same frequency as the tag. Second, consider the IQH… type
read heads. This line of RFID has a wide selection of tags and heads. Odds
are that there is something in this line that will fit your application. Third,
use the preceding table to determine which features you need for your
application.
Read Speed
There are usually two speeds that are discussed when it comes to RFID.
The first is how fast can the data be read off the tag, and the second is how
fast can the tag fly by the read head and still be read. The second speed is
based on the first, but it also takes into consideration the size of the head
and size of the tag. Basically, the higher the frequency, the faster the data
can be read; and the larger the head the faster the tag can pass the reader.
See the RFID introduction to determine how each system performs.
Tags
There are over 50 different tags in a variety of housings and performance
ratings.Tags can range in diameter from 8 mm to 58 mm. Industrial tags are
designed for tough and abusive environments:very high or low temperatures,
excessive wear and tear, and mounting in or on metal. Commercial tags are
less costly and can be used where very little abuse is expected. We have
the right tag for virtually any application.
Tag/Head Size Choices
It is important to note that if you choose a small tag, you should choose a
small head.There is very little to be gained in a mismatch either way.The most
efficient combinations are those where the head is similar in size to the tag.
Series P
Series Q
Frequency
125 kHz
13.56 MHz
Transfer Rate
2 kbit/s
26 kbit/s
Tags Embeddable In Metal
Yes
Yes
High Temperature Tags
Yes
Yes
Tag Capacities (bits)
1k
1k, 2k, 64k
Max Read Range
125 mm
170 mm
Write Limits
100,000
100,000 or unlimited
Identification Sytems RFID
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