APPX
Appendix 4 List of Special Relay Areas
651
A
SFC information
The following is a list of special relay areas relating to SFC information.
*1 There are restrictions on the firmware version of the CPU module and software version of the engineering tool. ( Page 747 Added
and Enhanced Functions)
For details on the SFC program, refer to the following.
MELSEC iQ-R Programming Manual (Program Design)
No. Name Data stored Details Set by (setting
timing)
SM320 Presence/absence
of SFC program
*1
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)
SM321 Start/stop SFC
program
*1
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
SM322 SFC program start
status
*1
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
SM323 Presence/absence
of continuous
transition for entire
block
*1
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.
U
SM324 Continuous
transition prevention
flag
*1
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)
SM325 Output mode at
block stop
*1
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
SM326 SFC device/label
clear mode
*1
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.
• Only labels are cleared at program writing to the programmable
controller after data are rebuilt even though this relay is on.
U
SM327 Output mode at
execution of the end
step
*1
Off: Hold step output off
On: Hold step output
retained
• When this relay switches to off, coil output is turned off for steps (SC, SE,
ST) for which transition is established and that are on hold reach the
END step.
• When this relay switches to on, coil output is retained (step becomes
inactive) for steps (SC, SE, ST) for which transition is established and
that are on hold reach the END step. However, coils are turned off
following forced termination.
U
SM328 Clear processing
mode when the
sequence reaches
the end step
*1
Off: Clear processing
performed
On: Clear processing
not performed
• Selects whether to perform clear processing if an active step other than
those retained in the block exists when the END step is reached. When
this relay switches to off, all active steps are forcibly terminated, and the
block is terminated. When this relay switches to on, block execution is
continued as is. When the END step is reached, if no active steps other
than those retained exist, all retained steps are terminated, and the block
is terminated.
U
SM329 Online change (SFC
block) status flag
*1
Off: Not being executed
On: Being executed
This relay turns on while the online change (SFC block) is being executed. S (Status change)
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