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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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