6F3B0250
5. Operating System Overview
In case of the T1S, Special register SW55 is used to specify the number of Data registers to be stored in the EEPROM. The allowable setting value is 0 to 2048.
The table below shows the correspondence between the SW55 value and Data registers saved in the EEPROM.
SW55 setting | Range of Data registers saved in | Remarks |
value | EEPROM |
|
0 | None |
|
1 | D0000 only |
|
2 | D0000 to D0001 |
|
3 | D0000 to D0002 |
|
: | : |
|
2047 | D0000 to D2046 |
|
2048 | D0000 to D2027 | Default value |
Others | D0000 to D2027 | Regarded as 2048 |
When the EEPROM Write command is executed, the T1S checks the value of SW55 and saves the Data registers into the EEPROM depending on the SW55 value. The value of SW55 itself is also saved in the EEPROM.
At the initial load or the EEPROM Read command is executed, the T1S checks the value for SW55 in the EEPROM and transfers the corresponding number of data to the Data registers of the RAM.
NOTE
(1)The EEPROM has the life limit for writing. It is 100,000 times. Pay attention not to exceed the limit. If the number of execution of EEPROM Write command exceeds 100,000 times, EEPROM alarm flag (S007) comes ON.
(2)In the T1S, if the EEPROM Write command is executed in RUN mode, only the user program is written into the EEPROM.
(3)The data in the EEPROM (D0000 to D0511 or D0000 to D2047) can also be read or written by using the program instruction (FUN236 XFER instruction).
(4)The SW55 setting is available only for the T1S.
86 T1/T1S User’s Manual
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