Siemens SIMATIC Ident Function Manual page 63

System
RF300: General notes on the meaning of the OTP memory
RF300 tags and ISO tags have a memory area that can be protected against overwriting.
This memory area is called OTP. Five block addresses are available for activating the OTP
function:
● FF80, FF84, FF88, FF8C and FF90
A write command to this block address with a valid length (4, 8, 12, 16, 20 depending on the
block address) protects the written data from subsequent overwriting.
NOTICE
OTP writing/locking should only be used in static operation.
NOTICE
Use of the OTP area is not reversible.
If you use the OPT area, you cannot undo it, because the OPT area can only be written to
once.
FB 45 for MOBY U, MOBY D, RF200, RF300
Function Manual, 07/2012, J31069-D0166-U001-A4-7618
Addressing
Start address
End address
ID no.: (fixed-coded; can only be output as a whole)
Start address
Length
6.2 Processing of data memories/transponders
16-bit hexadecimal number
0000
FEFC
FFF0
0008
Examples/applications
Integer number
+0
–
-16
+8
63