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APPENDICES
Appendix 2 List of Special Registers (for Link)
App - 3
APPENDICESINDEX
Appendix 2 List of Special Registers (for Link)
Data link information is stored as numeric values into the special registers (for link).
The special registers (for link) are used in the sequence program, and error locations and
causes can be checked by monitoring them.
The following table lists the special registers (for link) available for Q series local stations.
For those used in master and A/QnA series local stations, refer to the following manual.
Type MELSECNET, MELSECNET/B Data Link System Reference Manual
Table App.2 List of special registers (for link)
Buffer
memory
address
(Bit No.)
No. Name Description Details
Hexad
ecimal
Decim
al
13BH 315 D9243
Host station No.
information
Stores station No.
(0 to 64)
•Stores station No. of the host station.
•Useful for local station to check station No. of the host station.
13CH 316 D9244
Total number of
slave stations
Stores the number of
slave stations.
•Used for local stations to detect the number of slave stations in
the loop.
13DH 317 D9245
Receive error
detection count
Stores the accumulated
total of receive errors.
•Stores the accumulated counts of CRC, OVER, and ABIF
detections.
•Detected errors are counted up to "FFFF
H" and then counting is
stopped.
•Resetting the CPU module clears the count to "0".
140H 320 D9248
Local station
operating status
Stores status data of
station No.1 to No.16
•Stores station Nos. of STOP- or PAUSE-status local stations
except for the host station, into the corresponding bits in the
special registers (for link) as shown below.
•If a local station other than the host station goes down, data
before the failure will be held.
When the corresponding bit in D9252 to D9255 is "0", the
relevant bit in the above special registers is enabled.
•If the host station goes down, data before the failure will be also
held.
•Bits corresponding to the station Nos. of STOP or PAUSE status
local stations (except for host station) turn to "1".
(Example) When local stations No.7 and No.15 are in STOP or
PAUSE, bit 6 and bit 14 in D9248 are "1". By monitoring D9248,
"16448 (4040
H)" is identified.
•When the status of a local station except for the host station
changes to RUN or STEP RUN, the corresponding bit
automatically turns to "0".
•Bits corresponding to the host and remote I/O stations always
store "0".
141H 321 D9249
Stores status data of
station No.17 to No.32
142H 322
D9250
*1
Stores status data of
station No.33 to No.48
143H 323
D9251
*1
Stores status data of
station No.49 to No.64
D9248
b15b15 b14b14 b13b13 b12b12 b11b11 b10b10
b9b9
b8b8 b7b7 b6b6 b5b5 b4b4 b3b3 b2b2 b1b1 b0b0
L16 L15 L14 L13 L12 L11
L10
L9 L8 L7 L6 L5 L4 L3 L2 L1
DeviceDevice
No.No.
D9249
L32 L31 L30 L29 L28 L27
L26
L25 L24 L23 L22 L21 L20 L19 L18 L17
D9250
L48 L47 L46 L45 L44 L43
L42
L41 L40 L39 L38 L37 L36 L35 L34 L33
D9251
L64 L63 L62 L61 L60 L59
L58
L57 L56 L55 L54 L53 L52 L51 L50 L49
Bit No.Bit No.