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App -

104

APPENDICES

Table App. 3.11. Special register

ACPU

Special

Register

Special

Register

after

Conversion

Special

Register for

Modification

Name

Meaning

Details

Corresponding

CPU

D9232

SD1232

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 1 to 8

Stores the local or remote station number at which a forward or
reverse loop error has occurred

"F" in the above table indicates a forward loop line, and "R" a reverse
loop line. The bit of the device number corresponding to the station
number of the local station or remote I/O station that has a forward
loop line or reverse loop line error.
Example: When the forward loop line of station 5 has an error, b8 of

SD1232 become "1", and when SD1232 is monitored, its
value is "256 (100H)".

QnA

D9233

SD1233

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 9 to 16

D9234

SD1234

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 17 to
24

D9235

SD1235

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 25 to
32

D9236

SD1236

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 33 to
40

D9237

SD1237

–

Local station
and remote I/O
station loop
error

Stores conditions for
up to numbers 41 to
48

D9238

SD1238

–

Local station
and remote I/O
station loop
error

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

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 FFFFH.
To return the value to "0", perform reset operation.

QnA

D9241

SD1241

–

Local station
link type

Stores conditions for
up to numbers 33 to
48

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."

• 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 host (master) station goes down, the contents before going

down are also retained.

QnA

D9242

SD1242

Stores conditions for
up to numbers 49 to
64

D9243

SD1243

–

Station number
information for
host station

Stores station
number (0 to 64)

Allows a local station to confirm its own station number

QnA

D9244

SD1244

–

Number of link
device stations

Stores number of
slave stations

Indicates the number of slave stations in one loop.

QnA

D9245

SD1245

–

Receive error
detection count

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 FFFFH. To return the value to "0",
perform reset operation.

QnA

L/R2

SD1232

Bit

L/R8