CPU Specifications
and Operation
4–9
CPU Specifications and Operation
WARNING: You may never have to use this feature unless you want to clear any
setup information that is stored in system memory. Usually, you’ll only need to
initialize the system memory if you are changing programs and the old program
required a special system setup. You can usually load in new programs without ever
initializing system memory.
Remember, this AUX function will reset all system memory. If you have set special
parameters such as retentive ranges, etc. they will be erased when AUX 54 is used.
Make sure you that you have considered all ramifications of this operation before
you select it.
The DL05 PLCs provide certain ranges of retentive memory by default. The default
ranges are suitable for many applications, but you can change them if your
application requires additional retentive ranges or no retentive ranges at all. The
default settings are:
DL05
emory
rea
Default Range Available Range
Control Relays C400 – C777 C0 – C777
V Memory V1400 – V7777 V0 – V7777
Timers None by default T0 – T177
Counters CT0 – CT177 CT0 – CT177
Stages None by default S0 – S377
You can use AUX 57 to set the retentive ranges. You can also use DirectSOFT

menus to select the retentive ranges. Appendix A contains detailed information
about auxiliary
WARNING: The DL05 PLCs do not have battery back-up (unless the memory
cartridge, D0–01MC, is installed) The super capacitor will retain the values in the
event of a power loss, but only for a short period of time, depending on conditions.
Setting Retentive
Memory Ranges
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