APPENDICES
--------------------
MELSEC-A
Table
2.1
List
of
Special
Relays
(Continued)
Related
Number Name Description DetaUs SpecIal
Registers
M9042
Stop
status
OFF:
During
stop
•
Switched
ON
when
the
RUN/STOP
swnch
is
-
contsct
ON :
Not
during
stop
set
to STOP.
Sampling
OFF:
During
sampling
• Turned ON
upon
completion
of
sampling
M9043
trace
trace
trace
performed
the
number
of
times
preset
by
-
completion
ON :
Sampling
trace parameter after [STRAl
instruction
Is executed.
completion Reset when [STRAR]
instruction
is executed.
• Has
the
ssme
functions
as
the
[STRA]
and
[STAAR] instructions. (M9044 is
forced
to
switch ON/OFF by
the
peripheral
devlce.]
0
..
1 :
Same
as When
switch
on, M9044
provides
the
same
M9044
Sampling
[STRAl
execution
function
as
the
[STAAl instruction.
-
trace
1
~O
: Same as [STRAR]
• When switched off, M9044
provides
the
execution
same
functions
as
the
[STRAl
instruction.
• At this time.
the
sampling
trace
condition
is
based on the value in 09044.
(0
for
scan,
time
for
time
(10 ms
increments»
OFF:
Except
during
• ON
during
sampling
trace.
M904S
Sampling
trace
trace
-
ON : During trace
EIIOI
OFF:
Sequence
• Switch ON to execute
the
link
refresh enable,
*2
instruction
interrupt
control
disable
(El, 01) instructions.
M9053 ON :
Link
interrupt
-
switching
control
Status latch
OFF:
Uncompleted
• Turned ON when status latch is
completed.
M9055
completion
ON : Completed
Turned OFF by reset instruction.
-
flag
• Switched ON when one of remote terminal
modules has become faulty. (Communication
error is detected when normal
communication
Remote
is not restored after
the
number
of retries set
09180
terminal
OFF:
Normal
with 09174.)
to
M90S0
module
fault
ON :
Fault
• Switched OFF when normal
communication
09193
detection
with all remote
terminal
modules
is restored
09174
with automatic return enable.
•
Remains ON
without
automatic return.
•
If communication Is
stopped
at
fault
detection, this is not switched ON/OFF.
• Switched ON when
communication
with
I/O
modules
or remote
terminal
modules
has
become abnormal.
• Communication error is caused by
the
following.
• Initial data
error
M90S1
Communication
OFF:
Normal
• Cable
disconnection
090S1
error
ON
: Error
• Power OFF of I/O modules or remote
terminal
module
• Switched OFF
when
normal
communication
Is
restored with
automatic
return enable.
• Remains ON when
communication
is
suspended
at abnormal
detection
without
automatic return.
APP-8
•
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