808
APPX
Appendix 4 List of Special Relay Areas
SFC information
The following is a list of special relay areas relating to SFC information.
No. Name Data stored Details Set by (setting timing) CPU
SM320 Presence/absence of SFC
program
Off: No SFC program
On: SFC program
• This relay switches to on if an SFC
program has been registered, and
switches to off if it has not.
S (Initial) Rn
*1
RnP
*1
SM321 Start/stop SFC program Off: SFC program not
executed (stop)
On: SFC program
executed (start)
• The same value as SM320 is set for the
default value. (This relay automatically
turns on if there is an SFC program.)
• SFC program execution is stopped if this
relay switches from on to off, and
execution is restarted when it switches
from off to on.
• If this relay switches off before SFC
program processing, execution of the
SFC program is not started.
S (Initial)/U Rn
*1
RnP
*1
SM322 SFC program start status Off: Initial start
On: Resumption
• If the SFC program start mode in the
parameters is off for initial start, off is set
for the default, and if resumption, on is
set.
S (Initial)/U Rn
*1
RnP
*1
SM323 Presence/absence of
continuous transition for
entire block
Off: No continuous
transition
On: Continuous transition
• Sets whether there is a continuous
transition for blocks for which no SFC
information device continuous transition
bit has been set.
• No continuous transition when off.
Continuous transition when on.
• There is no effect on operation for blocks
for which the continuous transition bit has
been set.
URn
*1
RnP
*1
SM324 Continuous transition
prevention flag
Off: When transition
executed
On: When there is no
transition
• This relay switches to off during operation
in modes with continuous transition, or
during continuous transition, and switches
to on when it is not a continuous
transition.
• The relay is always on during operation in
modes with no continuous transition.
S (Status change) Rn
*1
RnP
*1
SM325 Output mode at block stop Off: Off
On: Hold
• Selects whether to retain coil output for
active steps during block stoppages.
• The default value when the output mode
for block stoppages in the parameters is
coil output off is off, and on when coil
output is retained.
• All coil outputs are turned off when off.
Coil outputs are retained when on.
S (Initial)/U Rn
*1
RnP
*1
SM326 SFC device/label clear
mode
Off: Device/label clear
On: Device/label retain
• Select the device status (all devices and
labels (including latch labels) excluding
step relay (S)) when the CPU module
status changes from STOP program
write RUN.
• This relay is valid only when an SFC
program exists after program writing.
• This relay is valid not only when an SFC
program is written, but also when the
program file and the parameter file are
written.
• When the Process CPU is used, only
labels are cleared at the program writing
to the programmable controller after data
are rebuilt even though this relay is on.
URn
*1
RnP
*1
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