Rockwell Automation 56RF RFID System User Manual - Manual (Page 21)

Rockwell Automation Publication 56RF-UM001A-EN-P - October 2011 21
RFID Components Chapter 2
Write Access Conditions
The Write Access Condition bits in block -1 determine the write access
conditions for each of the 28 user blocks and the special data block. These bits
can be set only to 1 with a lock command (and never be changed back to 0), i.e.
already write protected blocks can never be written to from this moment on.
In block -2 each byte can be individually locked.
Table 11 - Write Access
Block -1
Byte 0 Byte 1
MSB LSB MSB LSB
Conditon 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Write
Access for
Block
Number 3 2 1 0 -2
(3) -2
(2) -2
(1) -2
(0) 11 10 9 8 7 6 5 4
Block -1
Byte 2 Byte 3
MSB LSB MSB LSB
Conditon 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Write
Access for
Block
Number 19 18 17 16 15 14 13 12 27 26 25 24 23 22 21 20
IMPORTANT Changing of the Write Access conditions must be done in secure environment.
The label must not be moved out of the communication field of the antenna
during writing. We recommend to put the label close to the antenna and not to
remove it during operation.