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12.7 Special Relay List
12
TROUBLESHOOTING
*1: This applies to the CPU of function version B or later.
*2: The module whose first 5 digits of serial No. is 09012 or later.
*5: The Universal model QCPU except the Q02UCPU.
*6: The module whose first 5 digits of serial No. is 10042 or later.
Table12.29 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding
CPU
SM240 No. 1 CPU reset flag
OFF : No. 1 CPU reset
cancel
ON : No. 1 CPU resetting
• Goes OFF when reset of the No. 1 CPU is canceled.
• Comes ON when the No. 1 CPU is resetting
(including the case where the CPU module is
removed from the base).
The other CPUs are also put in reset status.
S (Status change) New
Q00/Q01
*1
Qn(H)
*1
QnPH
QnU
SM241 No. 2 CPU reset flag
OFF : No. 2 CPU reset
cancel
ON : No. 2 CPU resetting
• Goes OFF when reset of the No. 2 CPU is canceled.
• Comes ON when the No. 2 CPU is resetting
(including the case where the CPU module is
removed from the base).
The other CPUs result in "MULTI CPU DOWN" (error
code: 7000).
SM242 No. 3 CPU reset flag
OFF : No. 3 CPU reset
cancel
ON : No. 3 CPU resetting
• Goes OFF when reset of the No. 3 CPU is canceled.
• Comes ON when the No. 3 CPU is resetting
(including the case where the CPU module is
removed from the base).The other CPUs result in
"MULTI CPU DOWN" (error code: 7000).
SM243 No. 4 CPU reset flag
OFF : No. 4 CPU reset
cancel
ON : No. 4 CPU resetting
• Goes OFF when reset of the No. 4 CPU is canceled.
• Comes ON when the No. 4 CPU is resetting
(including the case where the CPU module is
removed from the base).The other CPUs result in
"MULTI CPU DOWN" (error code: 7000).
Qn(H)
*1
QnPH
QnU
*5
SM244 No. 1 CPU error flag
OFF : No. 1 CPU normal
ON : No. 1 CPU during stop
error
• Goes OFF when the No. 1 CPU is normal (including
a continuation error).
• Comes ON when the No. 1 CPU is during a stop
error.
Q00/Q01
*1
Qn(H)
*1
QnPH
QnU
SM245 No. 2 CPU error flag
OFF : No. 2 CPU normal
ON : No. 2 CPU during stop
error
• Goes OFF when the No. 2 CPU is normal (including
a continuation error).
• Comes ON when the No. 2 CPU is during a stop
error.
SM246 No. 3 CPU error flag
OFF : No. 3 CPU normal
ON : No. 3 CPU during stop
error
• Goes OFF when the No. 3 CPU is normal (including
a continuation error).
• Comes ON when the No. 3 CPU is during a stop
error.
SM247 No. 4 CPU error flag
OFF : No. 4 CPU normal
ON : No. 4 CPU during stop
error
• Goes OFF when the No. 4 CPU is normal (including
a continuation error).
• Comes ON when the No. 4 CPU is during a stop
error
S (Status change) New
Qn(H)
*1
QnPH
QnU
*5
SM250 Max. loaded I/O read
OFF : Ignored
ON : Read
• When this relay goes from OFF to ON, maximum
loaded I/O number is read to SD250.
UNew
QnA
Qn(H)
QnPH
QnPRH
Rem
SM251 I/O change flag
OFF : No replacement
ON : Replacement
• By turning this relay ON after setting the head I/O
number of the replaced I/O module to SD251, the I/O
module can be replaced online (with power on).
(Only one module can be replaced for each setting.)
• Turn this relay ON in the test mode of the program or
peripheral device for an I/O module change during
RUN, or in the test mode of the peripheral device for
an I/O change during STOP.
• Do not execute a RUN/STOP mode change until I/O
module change is finished.
UM9094
Q2A(S1)
Q3A
Q4A
Q4AR
SM252 I/O change OK
OFF : Replacement
prohibited
ON : Replacement enabled
• Goes ON when I/O replacement is OK. S (END) New
SM254
All stations refresh
command
OFF : Refresh arrival station
ON : Refresh all stations
• Effective for the batch refresh (also effective for the
low speed cyclic)
• Designate whether to receive arrival stations only or
to receive all slave stations in the MELSECNET/H.
UNew
Qn(H)
QnPH
QnPRH
• Designate whether to receive arrival stations only or
to receive all slave stations in the MELSECNET/G.
Qn(H)
*2
QnPH
*6
QnPRH
*6
• Effective for the batch refresh (also effective for the
low speed cyclic)
• Designate whether to receive arrival stations only or
to receive all slave stations.
QnU
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