816
APPX
Appendix 4 List of Special Relay Areas
Instruction related
The following is the list of special relay areas relating to the instruction-related items.
No. Name Data stored Details Set by (setting timing) CPU
SM699 Dedicated instruction skip
flag
Off: Instruction being
executed or completed
On: Instruction not
executed
• This relay indicates whether the built-in
Ethernet function instruction (the
SP.SOCOPEN/SP.SOCCLOSE/
SP.SOCRCV/S.SOCRCVS/SP.SOCSND/
SP.ECPRTCL/SP.SLMPSND/
SP.FTPPUT/SP.FTPGET instruction),
intelligent function module dedicated
instruction, or multiple CPU dedicated
instruction has been skipped. (Checking
this flag immediately after the instruction
issue allows to determine whether or not
the dedicated instruction is non-
processing (skipped) in the internal
processing.)
• This relay saves/returns while the
interrupt program is being executed.
S (Status change) ALL
SM700 Carry flag Off: Carry off
On: Carry on
• This relay is a carry flag used while the
application instruction is executing.
• This relay saves/returns when the
interrupt program is being executed.
S (Instruction execution) ALL
SM701 Number of output
characters selection
Off: Outputs until reaching
NULL code
On: Outputs 16 characters
• ASCII codes are output until reaching
NULL (00H) code, when SM701 is off.
• 16 characters of ASCII codes are output,
when SM701 is on.
• This relay saves/returns when the
interrupt program is being executed.
UALL
SM702 Search method Off: Sequential search
On: Dichotomizing search
• The search method in the search
instruction can be specified by using this
relay.
• To use the dichotomizing search, data
must be sorted.
• This relay saves/returns while the
interrupt program is being executed.
UALL
SM703 Sort order Off: Ascending
On: Descending
• This relay can be used to specify how to
arrange data in the sort instruction:
ascending or descending.
• This relay saves/returns while the
interrupt program is being executed.
UALL
SM704 Block comparison Off: Mismatch is detected
On: Completely match
• This relay switches to on when all the
data conditions are met in the block data
comparison instruction.
• This relay saves/returns while the
interrupt program is being executed.
S (Instruction execution) ALL
SM705 Number of conversion digits
selection
Off: Fixed number of digits
On: Desired number of
digits
• When SM705 is off, the conversion data
is specified and output with the fixed
number of digits.
• When SM705 is on, the conversion data
is specified and output with the desired
number of digits.
• This relay saves/returns while the
interrupt program is being executed.
URn
*1
SM709 DT/TM instruction improper
data detection flag
Off: No improper data
On: Improper data is
detected
• This relay switches to on when the
comparison target data is date data or
cannot be recognized as clock data, or
the comparison target device (three
words) exceeds the specified device
range in the DT/TM instruction.
• This relay saves/returns while the
interrupt program is being executed.
S (Instruction execution)/U ALL
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