Sram (Built-In Battery) Data Carrier - Omron CJ - 12-2004 Manual

Data Carrier Life Check
5-6-2

SRAM (Built-in battery) Data Carrier

Low Battery Check Method
1,2,3...
Data Carrier Life after a
Low Battery Is Detected
68
2. The Number of Writes Control command is executed with a Subtract spec-
ification and the number of writes set to 5.
3. The following illustration shows memory status when the total number of
writes has reached 300,000 writes. If the Number of Writes Control com-
mand is executed with a Subtract specification and the number of writes
set to 5, the Status Flag (word (n + 8), bit 04) in the Results Information will
turn ON.
The method used to control the life of the Data Carriers depends on the Data
Carrier memory type (SRAM or EEPROM). For SRAM (built-in battery) Data
Carriers, the life of the battery is controlled.
1. The low battery check for a Data Carrier is not performed constantly. It is
performed only when specific access is performed. This is because a spe-
cific current flows in internal circuits when the battery is checked, meaning
that the life of the battery would be reduced if the low battery check was
performed each time the Data Carrier was accessed.
We recommend that the system be programmed to routinely check the life
of the battery once a day.
2. The low battery check is performed only when the data in addresses 0000
(hex) and 0001 (hex) (2 bytes) is read.
3. Response for a Low Battery
The Battery Warning Flag (word (n + 8), bit 05) in the Results Information
will turn ON if the battery is low.
A Data Carrier with a built-in battery can be used for approximately one month
under normal conditions after a low battery is detected. Nevertheless, replace
the Data Carrier as soon as possible.
A Data Carrier with a replaceable battery (V600-D2KR16) can be used for
approximately two weeks under normal conditions after a low battery is
detected. Nevertheless, replace the Data Carrier (battery) as soon as possi-
ble.
Bit
Address
7
(hex)
000F
0010 0 4
0011 9 3
0012 D B
0013
Bit
Address
7
(hex)
000F
0010 0 0
0011 0 0
0012 0 0
0013
Section 5-6
Bit
0
Bit
0