DL205 User Manual, 4th Edition, Rev. D
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Chapter 3: CPU Specifications and Operations
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Selecting the Program Storage Media
Built-in EEPROM
The DL230 and DL240 CPUs provide built-in EEPROM storage. This type of memory is
non-volatile and is not dependent on battery backup to retain the program. The EEPROM
can be electrically reprogrammed without being removed from the CPU. You can also set
Jumper 3, which will write protect the EEPROM. The jumper is set at the factory to allow
changes to EEPROM. If you select write protection by changing the jumper position, you
cannot make changes to the program.
WARNING: Do NOT change Jumper 2. This is for factory test operations. If you change Jumper 2, the
CPU will not operate properly.
EEPROM Sizes
The DL230 and DL240 CPUs use different sizes of EEPROMs. The CPUs come from the
factory with EEPROMs already installed. However, if you need extra EEPROMs, select one
that is compatible with the following part numbers.
EEPROM Operations
Many AUX functions are specifically for use with an EEPROM in the Handheld Programmer.
This enables you to quickly and easily copy programs between a program developed offline in
the Handheld Programmer and the CPU. Also, you can erase EEPROMs, compare them, etc.
See the DL205 Handheld Programmer Manual for details on using these AUX functions with
the Handheld Programmer.
NOTE: If the instructions are supported in both CPUs and the program size is within the limits of the
DL230, you can move a program between the two CPUs. However, the EEPROM installed in the Handheld
Programmer must be the same size as (or larger than) the CPU being used. For example, you could not
install a DL240 EEPROM in the Handheld Programmer and download the program to a DL230. Instead, if
the program is within the size limits of the DL230, use a DL230 chip in the Handheld when you obtain the
program from the DL240.
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