Detection Of Data Carrier's Life - Omron SYSMAC C200H-IDS01-V1 Operation Manual

The User Program
2-3-6

Detection of Data Carrier's Life

Data Carrier with SRAM (Built-in Battery)
Battery Voltage Check
The date of production is registered in the following format:
Bit
Address 0000
Address 0001
Note Only the last 2 digits of the year are registered.
The following figures show examples of registered dates:
March 1988
Bit
Address 0000
Address 0001
December 1990
Bit
Address 0000
Address 0001
The detecting method of the Data Carrier's life varies with the kind of memory
(SRAM or EEPROM) incorporated by the Data Carrier. In the case of the Data
Carrier with SRAM, the life of the built-in battery will be checked. In the case
of the Data Carrier with EEPROM, the number of overwriting operations (pos-
sible up to 100,000 times or a desired number of operations) will be checked.
1,2,3... 1. The voltage of the Data Carrier's built-in battery can be checked only if the
user reads the two-byte data in addresses 0000 to 0001. The Data Carrier
is not designed so that the voltage is automatically checked, because at
the time of battery check, a certain amount of current flows through the in-
ternal circuitry of the Data Carrier, which in turn consumes the electricity
of the battery. We recommend the user to make a program so that the volt-
age of the battery can be checked once a day.
Battery Low Check Execution Command
a) Read command
b) Auto read command
2. When the voltage of the battery is low, the DC Warning Flag (word n+4 bit
7) will be turned ON.
7 6 5 4
Higher digit of month
Higher digit of year
7 6 5 4
0
8
7 6 5 4
1
9
Section 2-3
3 2 1 0
Lower digit of month
Lower digit of year
3 2 1 0
3
8
3 2 1 0
2
0
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