456
SM53
AC/DC DOWN
detection
OFF: AC/DC DOWN
not detected
ON: AC/DC DOWN
detected
This relay turns on if a momentary power
failure within 20ms occurs during use of
an AC power supply module. This relay is
reset when the CPU module is powered
off and then on.
S (Error) M9005
QCPU
This relay turns on if a momentary power
failure within 10ms occurs during use of
an AC power supply module. This relay is
reset when the CPU module is powered
off and then on.
LCPU
This relay turns on if a momentary power
failure within 10ms occurs during use of a
DC power supply module. This relay is
reset when the CPU module is powered
off and then on.
QCPU
LCPU
SM56 Operation error
OFF: Normal
ON: Operation error
• This relay turns on if an operation error
occurs.
• This relay remains on even after the
system returns to normal.
S (Error) M9011
QCPU
LCPU
SM60
Blown fuse
detection
OFF: Normal
ON: Module with
blown fuse
• This relay turns on if there is at least
one output module whose fuse has
blown.
• This relay remains on even after the
system returns to normal.
• Output modules on remote I/O stations
are also checked.
S (Error) M9000
QCPU
LCPU
*4
SM61
I/O module verify
error
OFF: Normal
ON: Error
• This relay turns on if the status of the
I/O module differs from that registered
at power-on.
• This relay remains on even after the
system returns to normal.
• I/O modules on remote I/O stations are
also checked.
S (Error) M9002
QCPU
LCPU
SM62
Annunciator
detection
OFF: Not detected
ON: Detected
This relay turns on if at least one
annunciator (F) turns on.
S
(Instruction
execution)
M9009
QCPU
LCPU
SM80 CHK detection
OFF: Not detected
ON: Detected
• This relay turns on if an error is
detected by the CHK instruction.
• This relay remains on even after the
system returns to normal.
S
(Instruction
execution)
New
Qn(H)
QnPH
QnPRH
SM84 Error clear OFF ON:Error clear
This relay is turned on to clear an error
set to SD84 and SD85.
UNew
QnUDV
LCPU
Number Name Meaning Explanation
Set by
(When Set)
Corresponding
ACPU
M9
Corresponding
CPU