Omron V680S Series User Manual page 185

 High-temperature Applications (V680-D1KP58HTN)
Data Retention
Due to the characteristics of EEPROM, any data that is written to an RF Tag may be lost if it is used
in a high-temperature environment that exceeds 125C for a total of more than 10 hours. Always
reset the data holding time before a total of 10 hours is reached.
Communications between the Reader/Writer and RF Tags may fail in high-temperature environments
of 85C or higher. Do not perform communications between the Reader/Writer and RF Tag in a high-
temperature environment of 85C or higher.
Due to the characteristics of EEPROM, the UID (RF Tag ID code) may be lost if an RF Tag is used in
a high-temperature environment that exceeds 125C. Do not use commands that use the UID in
high-temperature environments that exceed 125C.
Do not use the ID READ command.
You cannot use FIFO trigger communications.
Total Usage Time
This section gives the total time that an RF Tag can be placed at high temperatures.
Total usage time: 4 hours
Total usage time: 1 hour
1 hour at high
temperature*1
1 hour at 2 hours at
25 °C 25 °C
Data retention
The time that the RF Tag is left at temperatures lower than
time reset.
the high temperatures are not included in the total usage time.
Fig. Conceptual Diagram of Resetting the Data Retention Time
*1 High temperatures are those between 125 and 250°C.
 Data Retention Time Reset Procedure
Always use the following procedure to reset the data holding time before a total of 10 hours is reached.
When Using RF Tag Memory Addresses 0010 to 0015 hex
1. Read the data from RF Tag addresses 0010 to 0015 hex.
2. Write the read data to RF Tag memory addresses 0010 to 0015
hex.
The data retention time is reset only for the RF Tag memory addresses that are written.
To reset the data retention time, write the same data to all of the memory addresses that are used in the RF Tag.
Total usage time: 9 hours
Total usage time: 6 hours
3 hours at high 2 hours at high
temperature*1 temperature*1
3 hours at
25 °C
Data written to the memory
of the RF Tag.
Total usage time: 2 hours
3 hours at high
temperature*1
2 hours at 1 hour at
25 °C 25 °C
Data retention
time reset.
RF Tag Memory
0010 hex 00 hex
0011 11
hex hex
0012 22
hex hex
0013 33
hex hex
0014 44
hex hex
0015 55
hex hex
Write the data to the RF Tag
memory addresses that were read.
Section 8
Appendices
2 hours at high
temperature*1
3 hours at
25 °C
Read the memory addresses
that are used in the RF Tag.
RF Tag Memory
0010 00
hex hex
0011 11
hex hex
0012 hex 22 hex
0013 33
hex hex
0014 44
hex hex
0015 55
hex hex
RFID System
183
User's Manual