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MELSEC-Q
11 TROUBLESHOOTING
Special Register List (Continued)
ACPU
Special
Conversion
Special
Register after
Conversion
Special
Register for
Modification
Name Meaning Details
Corresponding
CPU
D9044 SD1044
For sampling
trace
Step or time during
sampling trace
• When SM803 is turned ON/OFF by peripheral device
to activate sampling trace STRA , STRAR , value
stored in SD1044 is used as sampling trace condition.
For scan ....... 0
For time ....... Time (10ms increments)
Value is stored into SD1044 in BIN code.
D9049 SD1049
Work area for
SFC
Extension file
register block No.
used as SFC
program execution
work area
• Stores the block number of the expansion file register
which is used as the work area for the execution of a
SFC program in a binary value.
• Stores "0" if an empty area of 16K bytes or smaller,
which cannot be expansion file register No. 1, is used
or if SM320 is OFF.
D9050 SD1050
SFC program
error number
Error code
generated by SFC
program
• Stores code numbers of errors occurred in the SFC
program in BIN code.
0: No error
80: SFC program parameter error
81: SFC code error
82: Number of steps of simultaneous execution
exceeded
83: Block start error
84: SFC program operation error
D9051 SD1051 Error block
Block number
where error
occurred
• Stores the block number in which an error occurred in
the SFC program in BIN code.
In the case of error 83 the starting block number is
stored.
D9052 SD1052 Error step
Step number where
error occurred
• Stores the step number in which error 84 occurred in
the SFC program in BIN code.
Stores "0" when errors 80, 81 and 82 occurred.
Stored the block starting step number when error 83
occurred.
D9053 SD1053 Error transition
Transition condition
number where error
occurred
• Stores the transfer condition number in which error 84
occurred in the SFC program in BIN code.
Stored "0" when errors 80, 81, 82 and 83 occurred.
D9054 SD1054
Error sequence
step
Sequence step
number where error
occurred
• Stores the sequence step number of transfer condition
and operation output in which error 84 occurred in the
SFC program in BIN code.
D9055 SD1055 SD812
Status latch
execution step
No.
Status latch
execution step No.
• Stores the step number when status latch is executed.
• Stores the step number in a binary value if status latch
is executed in a main sequence program.
• Stores the block number and the step number if status
latch is executed in a SFC program.
Block No.
(BIN)
Step No.
(BIN)
Higher 8 bits
Lower 8 bits
D9060 SD1060 SD392 Software version
Software version of
internal software
• Stores the software version of the internal system in
ASCII code.
Higher byte
Lower byte
The data in the lower byte
position is indefinite.
The software version is stored
in the higher byte position.
For version "A", for example, "41H" is stored.
Note: The software version of the initial system may
differ from the version indicated by the version
information printed on the rear of the case.
QnA
D9072 SD1072
PLC
communications
check
Data check of serial
communication
module
• In the self-loopback test of the serial communication
module, the serial communication module writes/reads
data automatically to make communication checks.
D9081 SD1081 SD714
Number of
empty blocks in
communications
request
registrtion area
0 to 32
• Stores the number of empty blocks in the
communication request registration area to the remote
terminal module connected to the MELSECNET/MINI-
S3 master unit, A2C or A52G.
QnA