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MELSEC-Q
11 TROUBLESHOOTING
Special Relay List (Continued)
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name
Meaning
Details
Applicable
CPU
M9036 SM1036
Always ON
ON
OFF
M9037 SM1037
Always OFF
O
N
O
FF
M9038 SM1038
ON for 1 scan
only after RUN
O
N
O
FF
1 scan
M9039 SM1039
RUN flag(After
RUN, OFF for 1
scan only)
ON
OFF
1 scan
• Used as dummy contacts of initialization and application
instruction in sequence program.
• SM1038 and SM1037 are turned on and off without
regard to position of key switch on CPU module front.
SM1038 and SM1039 are under the same condition as
RUN status except when the key switch is at STOP
position, and turned off and on. Switched off if the key
switch is in STOP position. SM1038 is on for one scan
only and SM1039 is off for one scan only if the key switch
is not in STOP position.
M9040 SM1040 SM206
PAUSE enable
coil
OFF : PAUSE disabled
ON : PAUSE enabled
M9041 SM1041 SM204
USE status
contact
OFF : PAUSE not in effect
ON : PAUSE in effect
• When RUN key switch is at PAUSE position or remote
pause contact has turned on and if SM204 is on, PAUSE
mode is set and SM206 is turned on.
M9042 SM1042 SM203
STOP status
contact
OFF : STOP not in effect
ON : STOP in effect
• Switched on when the RUN key switch or RUN/STOP
switch is in STOP position.
M9043 SM1043 SM805
Sampling trace
completed
OFF : Sampling trace in
progress
ON : Sampling trace
completed
• Turned on upon completion of sampling trace performed
the number of times preset by parameter after STRA
instruction is executed.
Reset when STRAR instruction is executed.
M9044 SM1044 SM803 Sampling trace
OFF
ON STRA
Same as execution
ON
OFF STRAR
Same as execution
• Turning on/off SM803 can execute STRA / STRAR
instruction.
(SM803 is forcibly turned on/off by a peripheral device.)
When switched from OFF to ON: STRA instruction
When switched from ON to OFF: STRAR instruction
The value stored in SD1044 is used as the condition for
the sampling trace.
At scanning, at time
→
Time (10 ms unit)
M9045 SM1045
Watchdog timer
(WDT) reset
OFF : Does not reset WDT
ON : Resets WDT
• The SM1015 relay is turned on to reset the WDT when
the ZCOM instruction and data communication request
batch processing are executed (used when the scan time
exceeds 200 ms).
M9046 SM1046 SM802 Sampling trace
OFF : Trace not in progress
ON : Trace in progress
•
Switched on during sampling trace.
M9047 SM1047 SM801
Sampling trace
preparations
OFF : Sampling trace
suspended
ON : Sampling trace started
• Sampling trace is not executed unless SM801 is turned
ON.
• Sampling trace is suspended when SM801 goes OFF.
M9049 SM1049 SM701
Selection of
number of
characters output
OFF : Output until NULL code
encountered
ON : 16 characters output
• When SM701 is OFF, characters up to NUL (00H) code
are output.
• When SM701 is ON, ASCII codes of 16 characters are
output.
M9051 SM1051
CHG instruction
execution disable
OFF : Enabled
ON : Disable
• Switched ON to disable the CHG instruction.
• Switched ON when program transfer is requested.
Automatically switched OFF when transfer is complete.
M9052 SM1052
SEG instruction
switch
OFF : 7SEG segment display
ON : I/O partial refresh
• When SM1052 is ON, the SEG instruction is executed as
an I/O partial refresh instruction.
• When SM1052 is OFF, the SEG instruction is executed
as a 7-SEG display instruction.
M9054 SM1054 SM205 STEP RUN flag
OFF : STEP RUN not in effect
ON : STEP RUN in effect
• Switched on when the RUN key switch is in STEP RUN
position.
M9055 SM1055 SM808
Status latch
completion flag
OFF : Not completed
ON : Completed
• Turned on when status latch is completed. Turned off by
reset instruction.
QnA
M9056 SM1056
Main side P, I set
request
OFF : Other than when P, I set
being requested
ON : P, I set being requested
M9057 SM1057
Sub side P, I set
request
OFF : Other than when P, I set
being requested
ON : P, I set being requested
• Provides P, I set request after transfer of the other
program (for example subprogram when main program is
being run) is complete during run. Automatically switched
off when P, I setting is complete.
M9058 SM1058
Main side P, I set
completion
Momentarily ON at P, I set
completion
M9059 SM1059
Sub program P, I
set completion
Momentarily ON at P, I set
completion
• Turned ON once when the P, I set has been completed,
and then turned OFF again.
M9060 SM1060
Sub program 2 P,
I set request
OFF : Other than when P, I set
being requested
ON : P, I set being requested
• Provides P, I set request after transfer of the other
program (for example subprogram when main program is
being run) is complete during run. Automatically switched
off when P, I setting is complete.