Omron V680S Series User Manual page 54

Section 2
Names and Functions of Components
 Field Extension Mode
You can use this mode to link Reader/Writers in order to extend the effective communications field.
Even if the workpieces are not all the same height or not oriented in the same direction, the placement
of more than one Reader/Writer enables communicating with the RF Tags without worrying about the
positions or orientation of the RF Tags.
This enables communications over a wide communications field and is therefore recommended for
applications in which the locations or orientation of the RF Tags is not consistent.
Workpiece
RF Tag
Slave
Reader/Writer
Slave
Reader/Writer
Communicating with RF Tags is possible without being affected by the orientation of the workpieces
If you use Field Extension Mode, you can use only three RF Tag communications commands: READ
DATA, WRITE DATA, and READ ID. Also, you can specify only the Once or Repeat communications
option. If you use the FIFO Repeat communications option in Field Extension Mode, an execution
status error will be indicated in the response.
Applicable RF Tag Communications Commands
READ DATA
WRITE DATA
DATA FILL
RF TAG OVERWRITE COUNT CONTROL
READ ID
COPY
LOCK
Applicable Communications Options
Once
Repeat
FIFO Repeat
In Field Extension Mode, the Reader/Writers do not simultaneously perform communications.
The Reader/Writers individually perform communications on a time sharing basis.
RFID System
52
User's Manual
(PROFINET)
Slave
Reader/Writer
Master
Reader/Writer
Workpiece
RF Tag
Effectively expanded communications field
(i.e., the locations where the RF Tags are attached).
Switching Hub
Supported?
Yes
Yes
No
No
Yes
No
No
Supported?
Yes
Yes
No
PLC