App
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Appendix 1 Special Relay List
APPENDICES
TableApp.8 Special relay
Number Name Meaning Explanation
Set by
(When Set)
Corres-
ponding
ACPU
M9
Corresponding CPU
SM715 EI flag
OFF : During DI
ON : During EI
• ON when EI instruction is being executed.
S (Instruction
execution)
New
SM720
Comment read
completion flag
OFF : Comment read not
completed
ON : Comment read
completed
• Turns on only during one scan when the processing
of the COMRD or PRC instruction is completed.
S (Status change) New
Qn(H)
QnPH
• Turns on only during one scan when the processing
of the COMRD instruction is completed.
Qn(H)
QnPH
QnPRH
SM721 File being accessed
OFF : File not accessed
ON : File being accessed
• Switches ON while a file is being accessed by the S.
FWRITE, S. FREAD, COMRD, PRC, or LEDC
instruction.
S (Status change) New
Qn(H)
QnPH
• Switches ON while a file is being accessed by the S.
FWRITE, S. FREAD, COMRD or LEDC instruction.
Qn(H)
QnPH
QnPRH
SM722
BIN/DBIN instruction
error disabling flag
OFF : Error detection
performed
ON : Error detection not
performed
• Turned ON when "OPERATION ERROR" is
suppressed for BIN or DBIN instruction.
UNewQCPU
SM730
BUSY signal for CC-
Link communication
request registration
area
OFF : Request for
communication with
intelligent device
station enabled
ON : Request for
communication with
intelligent device
station disabled
• Used for determination whether to enable or disable
the communication request for the intelligent device
station connected with CC-Link module.
S (Instruction
execution)
New
QnA
SM736
PKEY instruction
execution in progress
flag
OFF : Instruction not
executed
ON : Instruction execution
• ON when PKEY instruction is being executed.
Goes OFF when CR is input, or when input character
string reaches 32 characters.
S (Instruction
execution)
New
SM737
Keyboard input
reception flag for
PKEY instruction
OFF : Keyboard input
reception enabled
ON : Keyboard input
reception disabled
• Goes ON when keyboard input is being conducted.
Goes when keyboard input has been stored at the
CPU.
S (Instruction
execution)
New
SM738
MSG instruction
reception flag
OFF : Instruction not
executed
ON : Instruction execution
• Goes ON when MSG instruction is executed
S (Instruction
execution)
New
Qn(H)
QnPRH