656
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)
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)
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 while the interrupt program is
being executed.
S (Instruction
execution)
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 while the interrupt program is
being executed.
U
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.
U
SM703 Data sort instruction
sort order
Off: Ascending
On: Descending
• This relay can be used to specify how to arrange data in
the data sort instruction: ascending or descending.
• This relay saves/returns while the interrupt program is
being executed.
U
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)
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
SM752 Dedicated instruction
End bit control flag
Off: Automatically controlled
On: Not automatically controlled
This relay can be used to set whether the system
automatically controls the on/off operation of End bit being
used for the dedicated instruction and other (control of
End bit which is registered in the End processing of the
instruction completion and turned on for only the next one
scan (Off: turned on for only one scan after the instruction
is completed as well as normal/error End bit, On: turned
on when the instruction is completed and the On status is
maintained after that)).
U
SM753 File being accessed Off: Not in progress
On: In progress
• This relay is on during file access by the SP.FWRITE/
SP.FREAD/SP.DEVST instruction.
• This relay is on while the SP.FTPPUT/SP.FTPGET
instruction is being executed.
• This relay is on during access to the SD memory card
and data memory.
S (Status
change)
SM754 BIN/DBIN instruction
er
ror
control flag
Off: Executes error detection
On: No execute error detection
This relay can be switched to on when the error detection
is not desirable in the BIN/DBIN instruction.
U
SM755 Scaling data check
settings
Off: Performs data check
On: Not perform data check
This relay can be used to enable/disable the check
whether the scaling data is sorted in ascending order
when the SCL/DSCL/SCL2/DSCL2 instruction is being
executed.
U
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