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3. NAMES OF PARTS AND THEIR SETTINGS
3.2 Settings
3.2.1 RAM/E
2
PROM operation setting
3.2.2 Write protect switch setting
The A1FXCPU settings include RAM/E
The memory operation system includes RAM and E
Use the DIP switch (SW1) to select the memory operation system.
SW1 is factory-set in the RAM operation (lower) position.
ROM
RAM
Move SW1 to the lower position to
set RAM operation.
POINT
Before choosing the E
peripheral.
The write protect switch is used to prevent RAM and E
rewritten by operation performed from a peripheral.
Use this switch to prevent a program created from being rewritten or deleted, for
example.
When this function is used, RAM is write-protected in the RAM operation mode and
E
2
PROM write-protected in the E
Before making corrections to the RAM memory contents, clear write protect (move
the switch to the upper position).
Use the DIP switch (SW2) to select or clear write protect.
SW2 is factory-set in the write protect clear (upper) position.
1
2
PROTECT
Move SW2 to the lower position to select write protect.
PROM operation and write protect settings.
2
1
2
2
PROM mode, read the contents of RAM with a
2
PROM operation mode.
3 - 3
2
PROM modes.
ROM
1
RAM
Move SW1 to the upper position to
2
set E PROM operation.
2
PROM data from being
1
2
PROTECT
Move SW2 to the upper position to clear write protect.
MELSEC-A
2
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