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CPU MODULE4.
(c) Detailed contents of D9075
The following table shows the detailed contents of special register D9075.
(d) Details of special relays during boot operation
The following table shows the details of special relays during boot operation
Value in D9075 Description
00H Successful completion
F1H RAM operation (Set DIP switch 3 to ON.)
F2
H M9073 is off. (Turn on M9073.)
F3
H
Failed erasing the built-in ROM
F4
H
Failed writing to the built-in ROM
FE
H
Checking erasing the built-in ROM
FF
H
Writing to the built-in ROM
Special
Relay
Name Description Details
M9073
Setting of writing to
built-in ROM
OFF:Disables writing to ROM
ON: Enables writing to ROM
To enable writing to the
built-in ROM, turn on this
relay.
(DIP switch 3 should be set to ON.)
M9074
Request for writing to
built-in ROM
OFF ON:
Starts writing to ROM
When this relay is turned from off to on, writing to
the
built-in ROM is started.
M9075
Successful
completion of writing
to built-in ROM
OFF:Failed writing to ROM
ON: Successfully completed
to writing to ROM
Turns on when writing to the
built-in ROM is
successfully completed.
(The writing status is stored in D9075.)
M9076
Status of writing to
built-in ROM
OFF:Writing to ROM disabled
ON: Writing to ROM enabled
Turns on when writing to
built-in ROM is enabled.
(Turns on when DIP switch 3 is set to ON and
M9075 is on.)
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.
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