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MELSEC-Q
11 TROUBLESHOOTING
Special Register List (Continue)
ACPU
Special
Conversion
Special
Register after
Conversion
Special
Register for
Modification
Name Meaning Details
Corresponding
CPU
D9232 SD1232
Stores conditions
for up to numbers
1 to 8
D9233 SD1233
Stores conditions
for up to numbers
9 to 16
D9234 SD1234
Stores conditions
for up to numbers
17 to 24
D9235 SD1235
Stores conditions
for up to numbers
25 to 32
D9236 SD1236
Stores conditions
for up to numbers
33 to 40
D9237 SD1237
Stores conditions
for up to numbers
41 to 48
D9238 SD1238
Stores conditions
for up to numbers
49 to 56
D9239 SD1239
Local station and
remote I/O station
loop error
Stores conditions
for up to numbers
57 to 64
Stores the local or remote station number at which a
forward or reverse loop error has occurred
SD1232
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
L/R8 L/R7 L/R6 L/R5 L/R4 L/R3 L/R2 L/R1
SD1233
L/R16 L/R15 L/R14 L/R13 L/R12 L/R11 L/R10 L/R9
SD1234
L/R24 L/R23 L/R22 L/R21 L/R20 L/R19 L/R18 L/R17
SD1235
L/R32 L/R31 L/R30 L/R29 L/R28 L/R27 L/R26 L/R25
SD1236
L/R40 L/R39 L/R38 L/R37 L/R36 L/R35 L/R34 L/R33
SD1237
L/R48 L/R47 L/R46 L/R45 L/R44 L/R43 L/R42 L/R41
SD1238
L/R56 L/R55 L/R54 L/R53 L/R52 L/R51 L/R50 L/R49
SD1239
L/R64 L/R63 L/R62 L/R61 L/R60 L/R59 L/R58 L/R57
Bit
Device
number
RFR
F
RFR
FRFRFRFRF
RFR
F
RFR
FRFRFRFRF
RFRF
RFRF
R
FRF
R
FRF
RFR
F
RFR
F
R
FRFRFRF
RFRF
RFR
FR
F
R
F
R
FRF
RF
R
F
RFR
F
R
FRFRFRF
RFRF
RFR
FR
F
R
F
R
FR
F
RF
R
F
RFRF
R
FRFRFRF
In the above table, "F" indicates a forward loop line and
"R" a reverse loop line .The bit corresponding to the
station number at which the forward or reverse loop error
has occurred, becomes "1".
Example: When the forward loop line of station 5 has an
error, bit 8 of SD1232 become "1", and when
SD1232 is monitored, its value is "256 (100
H
)".
D9240 SD1240
Number of times
communications
errors detected
Stores
cumulative total
of receive errors
Stores the number of times the following transmission
errors have been detected:
CRC, OVER, AB. IF
Count is made to a maximum of FFFF
H
. RESET to return
the count to 0.
D9241 SD1241
Stores conditions
for up to numbers
33 to 48
D9242 SD1242
Local station link
type
Stores conditions
for up to numbers
49 to 64
Stores whether the slave station corresponds to
MELSECNET or MELSECNET II.
• Bits corresponding to the MELSECNET II stations
become "1."
• Bits corresponding to the MELSECNET stations or
unconnected become "0."
SD1202
SD1203
SD1241
SD1242
b15 b14 b13 b12 b11 b10 b9 b8 b7 b6 b5 b4 b3 b2 b1 b0
L16 L15 L14 L13 L12 L11
L32 L31 L30 L29 L28 L27
L48 L47 L46 L45 L44 L43
L64 L63 L62 L61 L60 L59
L26
L42
L58
L25
L41
L57
L24
L40
L56
L23
L39
L55
L22
L38
L54
L21
L37
L53
L20
L36
L52
L19
L35
L51
L18
L34
L50
L17
L33
L49
L10 L9 L8 L7 L6 L5 L4 L3 L2 L1
Bit
Device
number
• If a local station goes down during the operation, the
contents before going down are retained.
Contents of SD1224 to SD1227 and SD1228 to SD1231
are ORed. If the corresponding bit is "0", the
corresponding bit of the special register above becomes
valid.
• If the own (master) station goes down, the contents
before going down are also retained.
D9243 SD1243
Station number
information for host
station
Stores station
number (0 to 64)
Allows a local station to confirm its own station number
D9244 SD1244
Number of link
device stations
Stores number of
slave stations
Indicates the number of slave stations in one loop.
D9245 SD1245
Number of times
communications
errors detected
Stores
cumulative total
of receive errors
Stores the number of times the following transmission
errors have been detected: CRC, OVER, AB. IF
Count is made to a maximum of FFFF
H
. RESET to return
the count to 0.
QnA