BECKHOFF DK9322-1109-0011 - Manual (Page 3)

TwinCAT
TwinCAT Supplement ‚RFID Reader Communication‘
Application Note DK9322-1109-0011
Wear and tear
Procurement costs high
low
Barcode
Influence of dirt/moistrue
Influence of optical coverage failure
high no or little influence
no or little influence
variable
depends on the technique
Manufacture by customer possible not possible
Data density low high
Bulk reading capability
Unauthorised copying not possible
easy possible
difficult or impossible
Complexity of the application high very easy
RFID
Fig. 3 Differences between barcode and RFID
TwinCAT PLC RFID Reader Communication
In order to connect RFID readers to the controller, up to now the appropriate protocols had to be implemented for the various
readers on the basis of the serial interfaces. With the ‘TwinCAT PLC RFID Reader Communication’ TwinCAT library, a general,
abstract interface has been developed that can be used for any supported reader. The user sees only one block in the user
interface. The corresponding protocols have already been implemented internally for different readers; special adaptations to a
reader can be carried out simply via the configuration setting. The TwinCAT library is based on the IEC 61131-3 standard, with
which the data from the tags can be directly accessed or changed. This way, alongside the mere presence detection, the writing
of the RFID tags is also integrated into the PLC automation.
FB_Reader
eCommand
stAccessData
stCtrl
stCfg
bExecute
tTimeout
RxBuffer
TxBuffer
bBusy
bError
iErrorID
iErrCodeRcv
bResponseRcv
eResponse
stLowLevel
stReaderCfg
stReaderInfo
stTranspInfo
eManufacturer
Fig. 4 TwinCAT function block for reader implementation
The system hardware, consisting of transponders and readers, can be chosen by the user according to his application and
New Automation Technology Beckhoff 3
For application notes see disclaimer on the last page