Mitsubishi Electric MELSEC-Q Series User Manual page 220

APPENDICES
(4) Memory cards
Number Name
Memory card B OFF: Unusable
SM620
usable flags ON : Use enabled
Memory card B OFF: No protect
SM621
protect flag ON : Protect
OFF: No drive 3
SM622 Drive 3 flag
ON : Drive 3 present
OFF: No drive 4
SM623 Drive 4 flag
ON : Drive 4 present
OFF: File register not in use
SM640 File register use
ON : File register in use
OFF: Program memory
SM660 Boot operation
ON : Boot operation in
(5) Instruction-Related Special Relays
Number Name
OFF: Carry OFF
SM700 Carry flag
ON : Carry ON
OFF: Search next
SM702 Search method
ON : 2-part search
OFF: Ascending order
SM703 Sort order
ON : Descending order
OFF: Non-match found
SM704 Block comparison
ON : All match
0
SM715 EI flag
1
File being OFF: File not accessed
SM721
accessed ON : File being accessed
OFF: Error detection
BIN/DBIN
SM722 instruction error
ON : Error detection not
disabling flag
Selection of link
refresh OFF: Performs link refresh
SM775 processing during ON : No link refresh
COM instruction
execution
App - 4
Meaning
• Always ON
• Always ON
• Always ON
• Always ON
• Goes ON when file register is in use (Q00CPU, Q01CPU only)
execution
• Goes ON while boot operation is in process
progress
Meaning
• Carry flag used in application instruction
• Designates method to be used by search instruction.
• Data must be arranged for 2-part search.
• The sort instruction is used to designate whether data should be
sorted in ascending order or in descending order.
• Goes ON when all data conditions have been met for the BKCMP
instruction.
: During DI
• ON when EI instruction is being executed.
: During EI
• Switches ON while a file is being accessed by the S.FWRITE,
S.FREAD, COMRD, PRC, or LEDC instruction.
performed • Turned ON when "OPERATION ERROR" is suppressed for BIN or
DBIN instruction.
performed
• Select whether or not to perform link refresh processing in cases
where only general data processing will be conducted during the
performed execution of the COM instruction.
Special Relay List
Explanation
Explanation
MELSEC-Q
Set by (When Set)
S (Initial)
S (Initial)
S (Initial)
S (Initial)
S (Status change)
S (Status change)
Set by (When Set)
S (Instruction execution)
U
U
S (Instruction execution)
S (Instruction execution)
S (Status change)
U
U
App - 4