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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
M9104 SM1104 SM324
Continuous
transition
suspension flag
OFF : When transition is
completed
ON : When no transition
• Set when consecutive transfer is not executed with
consecutive transfer enabled. Reset when transfer of one
step is completed.
Consecutive transfer of a step can be prevented by
writing an AND condition to corresponding SM324.
M9108 SM1108 SM90
Step transition
watchdog timer
start (equivalent
of D9108)
M9109 SM1109 SM91
Step transition
watchdog timer
start (equivalent
of D9109)
M9110 SM1110 SM92
Step transition
watchdog timer
start (equivalent
of D9110)
M9111 SM1111 SM93
Step transition
watchdog timer
start (equivalent
of D9111)
M9112 SM1112 SM94
Step transition
watchdog timer
start (equivalent
of D9112)
M9113 SM1113 SM95
Step transition
watchdog timer
start (equivalent
of D9113)
M9114 SM1114 SM96
Step transition
watchdog timer
start (equivalent
of D9114)
OFF : Watchdog timer reset
ON : Watchdog timer reset
start
• Turned on when the step transfer monitoring timer is
started. Turned off when the monitoring timer is reset.
M9180 SM1180 SM825
Active step
sampling trace
completion flag
OFF : Trace started
ON : Trace completed
• Set when sampling trace of all specified blocks is
completed. Reset when sampling trace is started.
M9181 SM1181 SM822
Active step
sampling trace
execution flag
OFF : Trace not being executed
ON : Trace execution under
way
• Set when sampling trace is being executed.
Reset when sampling trace is completed or suspended.
M9182 SM1182 SM821
Active step
sampling trace
permission
OFF : Trace disable/suspend
ON : Trace enable
• Selects sampling trace execution enable/disable.
ON: Sampling trace execution is enabled.
OFF: Sampling trace execution is disabled.
If turned off during sampling trace execution, trace
is suspended.
M9196 SM1196 SM325
Operation output
at block stop
OFF : Coil output OFF
ON : Coil output ON
• Selects the operation output when block stop is
executed.
ON: Retains the ON/OFF status of the coil being used
by using operation output of the step being
executed at block stop.
OFF: All coil outputs are turned off. (Operation output by
the SET instruction is retained regardless of the
ON/OFF status of M9196.)
SM1197 SM1198
I/O numbers
to be
displayed
OFF OFF
X/Y
0 to 7F0
M9197 SM1197
ON OFF
X/Y
800 to FF0
OFF ON
X/Y
1000 to 17F0
M9198 SM1198
Switch between
blown fuse and
I/O verification
error display
ON ON
X/Y
1800 to 1FF0
Switches I/O numbers in the fuse blow module storage
registers (SD1100 to SD1107) and I/O module verify error
storage registers (SD1116 to SD1123) according to the
combination of ON/OFF of the SM1197 and SM1198.
M9199 SM1199
Data recovery of
online sampling
trace/status latch
OFF : Data recovery disabled
ON : Data recovery enabled
• Recovers the setting data stored in the CPU at restart
when sampling trace/status latch is executed.
• SM1199 should be ON to execute again. (Unnecessary
when writing the data again from peripheral devices.)