Basic Instructions; Read - Siemens SIMATIC Ident Function Manual

Configuring the instructions
4.5 Programming add-on instructions
4.5.2

Basic instructions

4.5.2.1

Read

The "Read" instruction reads the user data from the transponder and enters this in the
"IDENT_DATA" buffer. The physical address and the length of the data are transferred using
the "ADDR_TAG" and "LEN_DATA" parameters. With the RF68xR readers, the instruction
reads the data from memory bank 3 (USER area). Specific access to a certain transponder
is made with the "EPCID_UID" and "LEN_ID".
Figure 4-4
Table 4- 4
Parameter
ADDR_TAG
LEN_DATA
LEN_ID
22
Instruction "Read"
Explanation for the instruction "Read"
Data type
DINT
INT
SINT
Default values Description
0x00 Physical address on the transponder
where the read starts. You will find
more information on addressing in the
section "Transponder addressing
(Page 96)".
With MV: The length of the read code
is located starting at address "0" (2
bytes). The read code is located start-
ing at address "2".
0x00 Length of the data to be read
0x00 Length of the EPC-ID/UID
Default value: 0x00 ≙ unspecified
single tag access (RF200, RF300,
RF68xR)
Ident profile, Add-on instruction for Rockwell systems
Function Manual, 01/2019, C79000-G8976-C410-03
1)