Siemens SIMATIC Ident - Page 39

Setting parameters for blocks
3.4 Programming Ident blocks
Ident profile and Ident blocks, standard function for Ident systems
Function Manual, 10/2018, C79000-G8976-C387-04
39
Programming ATTRIBUTE "0x82"
If the number of transponders in the antenna field is unknown, repeat the "INVENTORY"
block with the ATTRIBUTE = "0x82".
*
The number of returned IDs "X" depends on the "ATTRIBUTE" used.
Figure 3-13 Program sequence of ATTRIBUTE "0x82" with unknown transponder populations
Results for RF61xR, RF68xR
The number of "TAG_DATA[x]" elements of the data types of the ATTRIBUTE "0x80" and
"0x81" depends on the number of transponders to be expected. For this reason, you need to
assemble the receive buffer yourself. Not the following structure when creating the receive
buffer "IDENT_DATA"/data type:
● The first element "NUM_MDS" is always of the type "WORD".
● The next element "TAG_DATA" is always of the type "ARRAY". The number of
transponders to be expected ("n") must be entered in the "ARRAY".
The following tables show an example of the structure of the receive buffer
"IDENT_DATA"/data type for the ATTRIBUTE "0x80" and "0x81".
Table 3- 16 ATTRIBUTE "0x80"
Name
Type
Comment
NUM MDS
WORD
Number of MDS
TAG_DATA
ARRAY[1..n]of
IID IN I 80
Length of EPC ID
TAG_DATA[1]
IID_IN_I_80
Reserved
BYTE
ID_Len
BYTE
Length of EPC ID
EPC_ID
ARRAY[1..62]
of BYTE
EPC-ID
tagPC
WORD
TAG_DATA[2]
IID_IN_I_80
...
...
TAG_DATA[n]
IID_IN_I_80