APPENDICES
--------------------
MELSEC-A
APPENDIX 3 List
of
Special Registers
The special registers are used
for
specific purposes in the A2C.
Table 3.1 shows
the
special registers and their purposes.
It is impossible to write datato those special registers not marked with *1 or
*2. (Read only)
(a) *1 Special registers: Reset (0) only.
(b)
*2
Special relays: Data can be written.
Check
their
purposes when used in
the
sequence program.
Table
3.1
List
of
Special
Registers
Stored
Releled Releled
Number
Name
Explanation
SpecIal SpecIal
Data
Relay.
Regl.ter.
• When fuse
blow
modules
are detected.
the
lowest
number
of
detected
units
is
stored
in
hexadecimal.
Fuse
(Example: When fuses of Y50 to 6F
output
modules
09100
09000
Fuse blow
have
blown,
"50·
is
stored
in
hexadecimal)
The
M9000
10
blown
module
module
number
monitored by the peripheral is
09107
number
hexadecimal.
(Cleared when all contents of 09100 to
09107
are reset to 0).
• If
I/O
module
data
is
different
from
data
entered
I/O
are
detected
when
the
power
is
turned
on,
the
first
I/O
module
I/O
number
of
the
lowest
number
module
among
module
verify
the detected
modules
stored
in hexadecimal.
09116
09002
(Storing
method
is
the
same as
that
of 09000.) M9001
10
verify
error
The
module
number
monitored by the
peripheral
is
09123
error
module
number
hexadecimal.
• (Cleared when all contents of
09116
of 09123 are
reselto
0.)
AC
AC
• 1 is
added
each
time
input
voltage
becomes 80%
*1
DOWN
DOWN or less of rating
while
the CPU
unit
is
performing
M9005
09005
time operation, and the value is stored in BIN code.
-
counter
count
Self-
Self-
• When error is
found
as a result of self-diagnosis,
*1
diegnoslic
diagnostic error
number
is stored in BIN code.
M9008
-
09008
error
'error
number
• When
one
of Fe to 255 is turned on by [OUT F] or
F
number
[SET F],
the
F number,
which
has been detected
Annun- at
which
earliest
among
the F numbers
which
have turned
09124
09009
ciator
external
on, is stored in BIN code.
M9009
10
detection failure
•
09009
cen be cleered by [RSTF] or [REOR]
09132
occurred
instruction. If another F
number
has been
detected, the clearing of 09009 causes
the
next
number
to be stored in 09009.
Slep
• When operation
error
has
occurred
during
number
execution of
application
instruction,
the
step
09010
Error
at
which
number, at
which
the error has occurred, is stored
M9010
-
slep
operation in BIN code. Thereafter, each time operation error
error has
occurs, the contents of
09010
are renewed.
occurred
APP-10
•
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