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8.2.2
RFID functions
8.2.2.1
Read UID/tag fields
This function allows you to read out the UID or a tag field from a transponder. Tag fields are user-
defined memory areas on a transponder. Specific transponder data can be read with tag fields.
So that the data can be displayed in the "Data" register, the parameters need to be selected
accordingly in the WBM.
For the "UID" use case, it is only necessary to select the "UID" parameter in the WBM. For the
"Tag fields" use case, the length and address of the user memory must be specified in the
WBM. Using the UID or the tag field selection, you can read out the data without changing
the read or write parameters in the Modbus client program.
UID
The "Command" register is preset with the "Read UID" command. The UID is output in the
"Data" registers. The "Length" register shows the length of the UID. The result output in the
"Data" register is valid if the register shows "Result = Done".
Tag fields
The "Tag field name" register contains the name of the tag field as it is configured in the
WBM. The "Command" register is preset with the "Read tag field" command. Note that the
command can be changed or a different tag field can be selected by the client during
runtime. If a different tag field is selected in the WBM, the "Command" and "Length" registers
are automatically changed accordingly.
Table 8-2
Register address
16
17
19
20 ... 119
8.2.2.2
Detecting the presence of a transponder
This register reports the presence of a transponder.
Table 8-3
Register address
0
SIMATIC RF1100
Operating Instructions, 08/2023, C79000-G8976-C698-02
Relevant registers
Relevant registers
Register name
Length
Command
Result
Data
Register name
Status
Programming
8.2 Programming via Modbus
65
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