Technical information
RFU6xx FB for
GX Works 2 (PNDP)
Page 9
3.5.1 Mode
The RFU can only communicate with a single transponder at the same time. For this reason,
read and write commands are always addressed. The function block uses the transponder
UII (Unique Item Identifier) in order to identify the transponder.
The function block supports two different modes in order to determine which transponder UII
is to be communicated with:
Single-Tag mode:
The system always communicates with the transponder which is currently in the reading
field. This mode can only be used when precisely one tag is located in the reading field. A
special configuration of the RFU output format with SOPAS (see chapter 3.5.3) is required
for this mode. If the Single-Tag mode is active, a trigger is automatically activated to read the
UII and the antenna with the best signal strength (RSSI).
Multi-Tag mode:
A user defined transponder UII is used for purposes of communication. The antenna to be
used must be defined in the respective read/write parameters.
Parameter
Declara-
tion
Data type
Description
Mode
Input
Bit
Addressing mode.
FALSE: Single-Tag mode active
TRUE: Multi-Tag mode active
Mode_
UIILength
Input /
Output
Word
[Signed]
Word length of the UII.
0
= Unaddressed
1...16 = Word length of the UII defined in
the Mode_UII array.
