Mitsubishi Electric MELCEC Q Series User Manual page 80

4. CPU MODULE
Special
Name
Relay
Setting of writing to
M9073
built-in ROM
Request for writing to
M9074
built-in ROM
Successful
M9075 completion of writing
to built-in ROM
Status of writing to
M9076
built-in ROM
(c) Detailed contents of D9075
The following table shows the detailed contents of special register D9075.
Value in D9075
00
H
F1
H
F2
H
F3
H
F4
H
FE
H
FF
H
(d) Details of special relays during boot operation
The following table shows the details of special relays during boot operation
Description
OFF:Disables writing to ROM
ON: Enables writing to ROM
OFF ON:
Starts writing to ROM
OFF:Failed writing to ROM
ON: Successfully completed
to writing to ROM
OFF:Writing to ROM disabled
ON: Writing to ROM enabled
POINT
(1) Like the conventional A2USHCPU-S1, the available capacity of the standard
memory (file register, comment, etc.) does not increase even if the ROM
operation is selected.
(2) During the ROM operation, the program stored in the built-in RAM is
overwritten with the program stored in the ROM.
Before starting the boot operation, be sure to back up the program with
peripheral devices.
(3) The capacity of the built-in ROM is 144k bytes, the same as that of the built-in
RAM. Writing is disabled when the total capacity of parameters and programs
exceeds 144k bytes.
(Comments and file registers cannot be written to the built-in ROM.)
(4) When the attempt is made to boot parameters and programs from the built-in
ROM to the built-in RAM but the built-in ROM does not contain proper
programs, a parameter error occurs. (Detailed error code: 114)
(5) "Write during RUN" is performed to the built-in RAM. When the boot operation
is used, be sure to write the program which is written to the built-in RAM
during RUN, also to the built-in ROM.
Successful completion
RAM operation (Set DIP switch 3 to ON.)
M9073 is off. (Turn on M9073.)
built-in
Failed erasing the
built-in
Failed writing to the
built-in
Checking erasing the
built-in
Writing to the ROM
To enable writing to the
relay.
(DIP switch 3 should be set to ON.)
When this relay is turned from off to on, writing to
built-in
the ROM is started.
Turns on when writing to the
successfully completed.
(The writing status is stored in D9075.)
Turns on when writing to
(Turns on when DIP switch 3 is set to ON and
M9075 is on.)
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Description
ROM
ROM
ROM
Details
built-in
ROM, turn on this
built-in
ROM is
built-in
ROM is enabled.