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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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