APPENDICES
--------------------
MELSEC·A
APPENDIX 2 List of Special Relays
The special relays are internal relays used
for
specific purposes.
Table 2.1 shows the special relays and their functions.
Those special relays not marked with *1 or
*2
cannot
be switched ON or
OFF.
(a) *1 Special relays: OFF only.
(b)
*2
Special relays: ON/OFF is possible depending on purpose.
Check their purposes when used in the sequence program.
Table
2.1
List
of
Special
Relays
Related
Number Name
Description
Detail.
Speclel
Register.
OFF:
Normal
•
Turned
ON
when
there
is
one
or
more
output
09000
*1
Fuse
blown
ON : Presence of
fuse
modules
of
which
fuse
has
been
blown.
D9tOO
M9000
blow
module
Remains ON if
normal
status
is restored.
to
09107
OFF:
Normal
•
Turned
ON if
the
status
of
I/O
module
is
09001
*1
110
module
ON
: Presence of
error
different
from
entered status
when
power
is
09116
M9002
verity
error
turned
ON. Remains ON if
normal
status is
to
restored.
09132
*1
ACOOWN
OFF:
AC is
good
•
Turned
ON if
power
failure
of
within
10 me
M9005
detection
ON
: AC
is
down
occurs. Reset when POWER switch is moved
09005
from
OFF to ON
position.
OFF:
Normal
• Turn ON when battery voltage reduces to
M9006
Battery
low
ON
: Battery low
less
than
specified.
Turn
OFF
when
battery
D9006
voltage
becomes
normal.
*1
Battery
low
OFF:
Normal
•
Turned
ON
when
battery
voltage
reduces
to
M9007
latch
ON : Battery
low
less
than
specified.
Remains ON if
battery
09007
voltage
becomes
normal.
*1
Seft-diagnostic
OFF:
Absence
of
error
•
Turned
ON
when
error
is
found
as a
result
of
D9008
M9008
error
ON : Presence
of
error
self-diagnosis.
OFF:
Absence
of
•
Turned
ON
when
OUT F or SET F
Instruction
D9009
detection
is executed.
Switched
OFF
when
09124
M9009
Annunciator
ON
: Presence of
value
is
set
to O.
09124
detection
detection
to
D9132
Operation
OFF:
Absence
of
error
•
Turned
ON
when
operation
error
occurs
M9010
error
flag
ON :
Presence
of
error
during
execution
of
application
instruction.
09010
Turned
OFF
when
error
is
eliminated.
*1
Operation
OFF:
Absence
of
error
•
Turned
ON
when
operation
error
occurs
M9011
error
flag
ON
: Presence of
error
during
execution
of
application
instruction.
09011
Remains ON if
normal
status
is
restored.
M9012
Carry
flag
OFF:
Carry
off
•
Carry
flag
used
in
application
instruction.
-
ON
:
Carry
on
APP-6
I
•
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