804
APPX
Appendix 4 List of Special Relay Areas
Diagnostic information
The following is the list of special rely areas relating to the diagnostic information.
No. Name Data stored Details Set by (setting timing) CPU
SM0 Latest self-diagnostic error
(including annunciator ON)
Off: No error
On: Error
• This relay turns on when the self-
diagnostics returns an error (including the
case when an error is detected by turning
the annunciator ON).
• The ON state is maintained even after the
error has been later cleared.
S (Error) ALL
SM1 Latest self-diagnostic error
(not including annunciator
ON)
Off: No error
On: Error
• This relay turns on when the self-
diagnostics returns an error (not including
the case when an error is detected by
turning the annunciator ON).
• The ON state is maintained even after the
error has been later cleared.
• This relay does not turn on when errors
that are notified by the PALERT
instruction or the PABORT instruction.
S (Error) ALL
SM50 Error reset OffOn:Error reset request
OnOff:Error reset
complete
• This relay clears the error state when the
mode transfers from off to on.
• This relay switches from on to off when
the error reset has been completed.
U/S (Status change) ALL
SM51 Battery low latch Off: Normal
On: Battery low
• This relay switches to on when the battery
voltage of the CPU module drops below
the specified value.
• The ON state is maintained even after the
battery voltage has been later recovered
to the normal value.
• This relay synchronizes with BAT LED.
S (Error) ALL
SM52 Battery low Off: Normal
On: Battery low
This relay has the same function as SM51
except for switching to off after the battery
voltage has been recovered to a normal
value.
S (Error) ALL
SM53 AC/DC DOWN Off: No AC/DC DOWN
detection
On: AC/DC DOWN is
detected
• This relay switches to on when a
momentary power failure within 20ms is
detected while the AC power supply
module is in use. This relay can be reset
when power is turned off and on.
• This relay switches to on when a
momentary power failure within 10ms is
detected while the DC power supply
module is in use. This relay can be reset
when power is turned off and on.
S (Error) ALL
SM56 Instruction execution fault Off: Normal
On: Instruction execution
fault state
• This relay switches to on when an error
which can be classified as instruction
execution fault is returned.
• The ON state is maintained even after the
error has been later cleared.
S (Error) ALL
SM60 Fuse Blown Off: Normal
On: Fuse blown is
detected
• This relay is on when at least one output
module is in fuse blown state and the ON
state is maintained even after later
recovering to the normal state.
• The fuse blown state check is also done
for output modules on the remote I/O
station.
S (Error) ALL
SM61 I/O module verification error Off: Normal
On: Error
• This relay switches to on when the state
of the I/O module is different from one
registered during power-on, and the ON
state is maintained even after later
recovering to the normal state.
• I/O module verification is also done for
modules on the remote I/O station.
S (Error) ALL
SM62 Annunciator Off: Not detected
On: Detected
• This relay switches to on when at least
one annunciator is turned on.
• This relay returns to off when all the
annunciators are turned off.
S (Instruction execution) ALL
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