Data Structures Of Fb 45 - Siemens SIMATIC Ident Function Manual

2.3

Data structures of FB 45

The following figure shows an example of a definition of several RFID channels with the
related tag commands and the user data.
Figure 2-1
Each FB 45 call points to a separate parameter data block (Params_DB, Params_ADDR),
which is defined by a UDT 10 The variables "command_DB_number" and
"command_DB_address" are stored in the UDT 10. These variables point to the RFID
command that will be executed with the tag.
UDT 20 is used to define the RFID command. Different commands or chains of commands
can be defined by calling UDT 20 several times (see Section "Command chaining"). The
variables "DAT_DB_number" and "DAT_DB_address" are defined in the UDT 20. This
variable definition forms the pointer to the user data which is simply referred to as DAT_DB
in this function manual. Tag data is stored there when it is read out. When using a write
command, the user must store his data before executing the command.
FB 45 for MOBY U, MOBY D, RF200, RF300
Function Manual, 07/2012, J31069-D0166-U001-A4-7618
Configuration scheme of FB 45
Description
2.3 Data structures of FB 45
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