Mitsubishi MELSEC Q Series

App-185
8
8
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A
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Appendix3 SPECIAL RELAY LIST
(16) Built-in I/O function
Number
Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM1840 Axis 1 busy
OFF : Not busy
ON : Busy
• This relay turns on when positioning
control, OPR control, JOG operation, or
absolute position restoration is started.
This relay turns off when each control is
completed. In positioning control, this relay
turns off when the axis 1 decelerates and
stops, and then "dwell time" elapsed. (This
relay remains on while positioning control is
being performed.)
• This relay turns off when each control is
ended due to such as an error or stop
operation.
S
(Every END
processing)
New LCPU
SM1841
Axis 1 positioning
completion
OFF : Not completed
ON : Completed
• This relay turns on when OPR control,
position control, or absolute position
restoration is completed.
• This relay turns off when OPR control,
positioning control, absolute position
restoration, or JOG operation is started.
• This relay remains off when JOG operation
is completed.
• This relay remains off when position control
is stopped.
S
(Instruction
execution/
Status change)
SM1842
Axis 1 OPR
request
OFF : Machine OPR
control
completed
ON : Machine OPR
control started
• This relay turns on when the CPU module
is powered on, is reset, or is set from STOP
to RUN; or the drive unit ready signal turns
off; or machine OPR control is started.
• This relay turns off when machine OPR
control is completed.
S
(Every END
processing)
SM1843
Axis 1 OPR
completion
OFF : Not completed
ON : Completed
• This relay turns on when machine OPR
control is completed.
• This relay turns off when OPR control,
positioning control, absolute position
restoration, or JOG operation is started; or
the CPU module is set from STOP to RUN;
or the drive unit ready signal turns off.
S
(Instruction
execution/
Status change)
SM1844 Axis 1 speed 0
OFF : Operating at
speed other than
0
ON : Operating at
speed 0
• This relay turns on when JOG operation or
speed control in speed/position switching
control set at a speed of "0" is started.
• This relay turns on when speed is changed
with a new speed value of "0", and turns off
when speed is changed with a new speed
value other than "0".
• This relay turns off when SM1840 turns off.
S
(Every END
processing)
SM1845 Axis 1 error
OFF : No error
ON : Error
• This relay turns on if an error occurs.
• The present error can be checked by
SD1845.
• This relay is turned off by turning on
SM1850.
SM1846 Axis 1 warning
OFF : No warning
ON : Warning
• This relay turns on if a warning occurs.
• The present warning can be checked by
SD1846.
• This relay is turned off by turning on
SM1850.
SM1847
Axis 1 start in
busy status
OFF : No start
attempted in
busy status
ON : Start attempted in
busy status
• This relay turns on when positioning
control, OPR control, JOG operation, or
absolute position restoration is attempted
while the axis 1 is in the busy status. The
executed start instruction will be ignored.
• This relay is reset by the user.
S
(Instruction
execution)
/U