APPENDICES
/MELSEC-A
Description
Details
ON
Used
as
dummy contacts of initialization and application instruction
ir
Normally ON
MW36
and M9037 are switched
ordoff
independently of the CPU
sequence program.
nFF
RUNISTOP switch position. M9038 and "39 are switched
ordoff
in
Normally OFF
-. .
ON
accordance with the RUWSTOP switch position, i.e. switched
off
wher
oFFwT
1 Scan
the switch is set to STOP. When the switch is set to other than STOP
M9038
is only switched on during 1 scan and M9039 is only switched
OR
ON
WA
during 1 scan.
OFF
OFF: PAUSE disabled
When RUN
key
switch is at PAUSE position or remote pause contact hac
ON: PAUSE enabled
turned on and if
M9040
is on, PAUSE mode is set and M9041 is turnea
OFF: During pause
on.
ON: Not during pause
-
1
scan
On only
for
1
scan after run
RUN flag
(OR
onlv for 1
scan
after run)
PAUSE enable
coil
PAUSE status
contact
contact
stop status
completion
Sampling trace
M9042
OFF: During stop
ON:
Not
during stop
Switched on when the RUNISTOP switch is set to STOP.
OFF:
During
sampling
Reset when instruction is executed.
ON:
Turned on upon completion of Sam lin trace performed the number
of
trace
completion
times preset b ararneter after instruction is executed.
Has the same functions as the
I
STRA
1
and
ISTRAR]
instructions.
(M9044
is forced to switch
ordoff
by the peripheral device.)
0-1: Same
as
When switched on,
MW
provides the same function as the
M9043
M9044
execution
instruction.
1-0: Same as
m1I
When switched
off,
MW
provides the same function
as
the
Sampling trace
execution instruction.
At this time, the sampling trace condition is based on the value in
D9044.
(0
for scan, time for time (10 ms increments))
OFF: Except during
trace
On during sampling trace.
Sampling trace
ON: During trace
OFF: Seauence inter-
I
ON:
Link
interrupt
con-
Switch on to execute the link refresh enable, disable (El, Dl) instructions.
rupi
control
M9053
*2
M9055
M9061
EVDl
instruction
switching
Status
latch
completion flaq
trol
OFF: Uncompleted
instruction.
ON: Completed
Turned on when status latch is completed. Turned
off
by reset
Switched
ON
when one of remote terminal modules has become faulty.
(Communication error is detected when normal communication is not
restored after the number of retries
set
with D9174.)
Switched OFF when normal communication with
all
remote terminal
modules is restored with automatic return enable.
Remains ON without automatic return.
If communication is stopped at fault detection, this is not switched
Switched ON when communication with
VO
modules or remote terminal
Communication error is caused by the following.
OFF: Normal
ON: Fault
ON/OFF.
modules has become abnormal.
*
Initial data error
-
Cable disconnection
Switched OFF when normal communication is restored with automatic
*
Power OFF of
WO
modules or remote terminal modules
Remains ON when communication is suspended at abnormal detection
return enable.
without automatic return.
Switched ON when one of
I/O
modules has become faulty. (Communica-
tion error is detected when normal communication
is
not restored after
the number of retries set with 09174.)
Switched OFF when normal communication with
all
WO
module is
restored with automatic return enable.
Remains ON without automatic return.
If communication is stopped
at
fault detection, this is not switched
For setting OFF/ON of
all
outputs at an occurrence of communication
OFF: Normal
ON: Error
OFF: Normal
ON: Fault
ON/OFF.
OFF: All outputs are
ON: Normal output
turned
off.
error.
*
OFF: All outputs are turned OFF at communication error.
*ON:
Output status at an occurrence of communication error is
OFF: Communication re-
quest to remote ter-
minal modules en-
ablsd.
For determining enablddisable of communication request to remote
quest to remote ter-
minal modules dis-
retained.
ON:
Communication re-
terminal modules using the
-1
instructions.
D9180
to
D9193
D9174
D9061
Remote termin-
SI
module fault
detection
Communication
wror
D9174
D9196
D9199
to
VO
module
fault detection
M9067
M9069
M9081
%messing at
mmmunication
wror
:ommunication
quest
to re-
note terminal
nodules
Table
2.1
Ust
of
Special Relay (Continue)
APP-4
.'Y
IB
(NA)
6623&A
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