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84 T1/T1S User’s Manual
5. Operating System Overvi ew

5.2 About the built-in EEPROM

The T1/T1S is equipped with a built- in EEPRO M and a RAM as standard feat ur es.
The user program is stored in the EEPROM so that the user program can be maintained
without the need of a battery. A part of the Dat a r egister can also be stor ed in t he
EEPROM.
The table below shows the contents stor ed in t he built-in EEPROM.
T1 T1S
User program Entire program (2 k steps) and
System infor mation Enti re program (8 k steps ) and
System infor mation
User data Leading 512 words of Dat a
register (fixed).
D0000 - D0511
User specified number of Data
register st ar ting with address
0. It is set by SW55.
D0000 - Dnnnn
(up to 2048 words)
Other data -SW36 - SW38:
Programmer port settings
SW55:
Number of Data register to
be saved in the EEPROM
SW56 - SW57:
RS-485 port set tings
The user pr ogram and the dat a stored in the EEPROM is transferred to the RAM when
power is turned on. Subsequent program execution is done based on the RAM contents.
Progr am editing is also performed on the RAM contents.

Therefore, if t he program is modified, i t is necessary to issue the EEPROM Wri t e

command from the programming t ool . O t herwise, the modif ied program is over-

writ t en by ori ginal EEPROM cont ent s when the power is t urned of f and on again.

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