SIMATIC RF310M software
6.5 The functions in the "Tag" menu
6.5.7
Write OTP
The "Write OTP" key is non-reversible.
Please note that the OTP memory area can only be written to once. It is not possible to
change the values in the OTP area of a tag at a later time.
Using "Tag > Write OTP" (or <ALT+T+O
is at a sufficient distance from the Mobile Reader.
Confirm the message "After acknowledging with OK, the selected memory blocks can no
longer be modified (read only)".
For OTP memory areas of the RF300 tags, see the System Manual RF300, transponders,
memory configuration of the RF300 tag.
The OTP areas refers to 5 block addresses 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.
Note
When the OTP area is used, it must be ensured that the blocks are used without gaps,
starting with Block 0.
Examples:
3 blocks (with write command), Block 0, 1, 2 (FF80, length = 12): valid
2 blocks (consecutive), Block 0 (FF80, length =4), Block 1 (FF84, length = 4): valid
2 blocks (consecutive), Block 0 (FF80, length =4), Block 2 (FF88, length = 4): Invalid
1 Block, Block 4 (FF90, length = 4): Invalid.
The EEPROM user memory (address FF00-FF13, or FF80-FF90) requires significantly more
time for writing than the high-speed FRAM memory (approx. 11 ms/byte). For time-critical
applications with a write function, it is therefore recommended that FRAM tags are used (e.g.
RF340T, RF350T, RF360T).
38
CAUTION
), you can write once to the OTP area of a tag that
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Operating Instructions, 07/2007, J31069-D0191-U001-A1-7618
SIMATIC RF310M Mobile Reader