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66 T1-16S User’s Manual
5. Operating System Overview
5.2 About the built-in EEPROM
The T1-16S is equipped with a built-in EEPROM and a RAM as standard features.
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 Data register can also be
stored in the EEPROM.
The table below shows the contents stored in the built-in EEPROM.
T1-16S
User program Entire program (8 k steps) and System information
User data User specified number of Data register starting with address 0.
It is set by SW55.
D0000 - Dnnnn
(up to 2048 words)
Setting
information SW36 - SW38:
Programmer port settings
SW55:
Number of Data register to be saved in the EEPROM
SW56 - SW57:
RS-485 port settings
Sampling trace setting information
The user program and the data stored in the EEPROM are transferred to the RAM
when power is turned on. Subsequent program execution is done based on the RAM
contents. Program editing is also performed on the RAM contents.
Therefore, if the program is modified, it is necessary to issue the EEPROM Write
command from the programming tool. Otherwise, the modified program is over-
written by original EEPROM contents when the pow er is turned off and on again.