Drive information
The special relays for drive information are shown below.
R: Read only, R/W: Read/Write
No.
Name
SM600
Memory card usable
SM601
Memory card protect
SM603
Memory card insertion
SM605
Memory card interchange protect
SM606
Memory card disable request
SM607
Memory card disable status
SM632
Data memory write error detection
SM633
Data memory writing
SM634
Data memory write count error detection flag
Instruction related
The special relays related to instruction execution are shown below.
R: Read only, R/W: Read/Write
No.
Name
SM699
Dedicated instruction skip flag
SM700
Carry flag
SM701
Output characters selection
SM703
Sort order
SM704
Block comparison
SM709
DT/TM instruction improper data detection
Firmware update function
The special relays for firmware update function are shown below.
R: Read only, R/W: Read/Write
No.
Name
SM912
Firmware update prohibit state
APPX
322
Appendix 1 Special Relay List
Description
OFF: Unusable
ON: Use enabled
OFF: Not protected
ON: Protected
OFF: No drive 2
ON: Drive 2 present
OFF: Remove/insert enabled
ON: Remove/insert prohibited
OFF: Clear command
ON: Command
OFF: Not disabled by SD memory card forced stop request
ON: Disabled by SD memory card forced stop request
OFF: Write not executed/normal
ON: Write error
OFF: Write not executed
ON: Writing
OFF: Overwrite count is less than 20,000
ON: Overwrite count is 20,000 or more
Description
OFF: Intelligent dedicated instruction executed
ON: Intelligent dedicated instruction not executed
OFF: Carry OFF
ON: Carry ON
OFF: NULL code output
ON: No change
OFF: Ascending order
ON: Descending order
OFF: Non-match found
ON: All match
OFF: Improper data not detected
ON: Improper data detected
Description
OFF: Firmware update enable state
ON: Firmware update prohibit state (Firmware update prohibited
file is present)
R/W
R
R
R
R/W
R/W
R
R
R
R
R/W
R/W
R
R/W
R/W
R
R/W
R/W
R