.,,
,
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.
Mm
Fuse
blown
I
Selfdia@ostic
M9009
Annunciator
detection
M9023
I
User timing
clock No.
3
timing
0.1
Second
M9034
1
minute clock
Denription
OFF:
Normal
ON: Presence of fuse
blow module
OFF:
Normal
ON: Presence of error
OFF:
AC is good
ON: AC is down
OFF:
Normal
ON: Battery low
.
OFF:
Normal
ON: Battery low
OFF:
Absence of error
ON: Presence
of
error
OFF:
Absence of detec.
ON: Presence of detec
OFF:
Absence of error
ON: Presence
of
error
OFF:
Absence of error
ON: Presence of error
tion
tion
OFF:
Carry
off
ON:
Carry on
OFF:
No processing
ON: Output clear
OFF:
No processing
ON: Output clear
~~~ ~ ~ ~
n2 scan
n2
scan
%
nl
scan
D.trilr
Turned on when there is one or more output modules of which fuse has
been blown. Remains on if normal status is restored.
Turned on if the status of
I/O
module is different from entered status
when power is turned on. Remains on if normal status is restored.
Turned on if power failure of within
10
ms occurs. Reset when POWER
Turned on when battery voltage reduces to
less
than specified. Turned
Turned on when battery voltage reduces to less than specified. Remains
switch is moved from
OFF
to
ON
position.
off when battery voltage becomes normal.
on if battery voltage becomes normal.
Turned on when error is found as
a
result
of
self-diagnosis.
Turned on when OUT
F
or SET
F
instruction is executed. Switched
OR
when
D9124
value is set to
0.
Turned on when operation error occurs during execution of application
Turned on when operation error occurs during execution of application
instruction. Turned
off
when error is eliminated.
instruction. Remains on if normal status
is
restored.
Carry flag used in application instruction.
Clears all data memory (except special relays and sDeciaI registers) in
remote run mode from computer, etc. when
M9016
is
1.
-
Clears all unlatched data memory (except special relays and special
registers) in remote run mode from computer, etc. when
M9017
is
1.
Relay which repeats onloff at intervals of oredetermined scan.
When power is turned on or reset is performed, the clock starts with off.
Set the intervals of ordoff instruction.
14
+I
DUP(
I
nl-1
0.1
second,
0.2
second,
1
second,
2
second, and
1
minute clocks are
Not turned on and off per scan but turned on and off even during sc8n if
Starts when power is turned on or reset is performed.
generated.
corresponding time has elapsed.
T8ble
2.1
List
of
Spacial
Relay
(Continue)
R0M.d
2$2l!s
D9ooo
D9100
D9107
to
D9001
D9116
D9132
to
D9005
D9006
09007
D9008
D9009
D9124
to
D9132
m10
D9011
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