APPENDICES
/MELSEC-A
Appendix
3
List
of
Special
Registers
m10
-
DM11
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 data to 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.
N8W
Explanation
Stored
Dub
Rdd
RJItd
When
fuse
flow modules are detected, the lowest number of detected
Fuse
blown
units is stored in hexadecimal. (Example: When fuses of
Y50
to 6F
Fuse
blow
module
D9107
D9100
output modules have blown, '50" is stored in hexadecimal) The module
(Cleared when all contents of D9100 to D9107 are reset to
0.)
number monitored by the peripheral is hexadecimal.
to
M9000
If
VO
module data is different from data entered are detected when the
VO
unit verify
VO
module verify among the detected modules stored in hexadecimal. (Storing method is
power is turned on, the first
I10
number of the lowest number module
D9116
error
error module number
W123
to
M9001
the same as that of D9000.) The module number monitored by the
number
peripheral is hexadecimal.
(Cleared when all contents of D9116 of 09123 are reset to
0.)
2&:tyN
arror
-
M9008
*
When error is found as
a
result of self-diagnosis, error number is stored
Self-diagnostic error
diagnostic
Self-
-
M9005
the CPU unit is performing operation, and the value is stored in BIN
AC
DOWN
time count
1 is added each time input voltage becomes 80% or
less
of rating while
code.
number in BIN code.
When one of FO to 255 is turned on by
lm
or
-1
the
F
Plnnunciator
number
at
which
ex-
to
M9009
09009
can be cleared by or instruction. If another
F
redfail failure
has
detection
number, which has been detected earliest among the
F
numbers which
have turned on, is stored in BIN code.
number to be stored in 09009.
D9132
number has been detected, the clearing of D9009 causes the next
D9124
Error
step
When operation error has occurred during execution of application
D9010 are renewed.
-
BIN code. Thereafter, each time operation error occurs, the contents of
occurred
*
When operation error has occurred during execution of application
Step
number
at
which
instruction, the step number, at which the error has occurred, is stored in
operation
error
has
off
to on, the contents of D9010 cannot be renewed unless M9011 is
occurred
instruction, the step number, at which the error has occurred, is stored in
Step number at which
Error step
-
M9011
BIN code. Since storage into D9011
is
made when M9011 changes from operation error has
cleared by user program.
IO
control
1
=
Input in refresh mode, output in direct mode
number
node
0
=
VO
in direct mode
VO
control mode
The set mode is represented as follows:
--
3
=
VO
in refresh mode
7-
"P
'-
u-
I
Table
3.1
List of
Special
Registers
(Continue)
APP-6
w
18
INA)
66238-A
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