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App - 4
Appendix 2 List of Special Registers (for Link)
APPENDICES
* 1 Used for the MELSECNET data link system only.
144H 324 D9252
Local station
error status
Stores status data of
station No.1 to No.16
•Stores station Nos. of faulty local stations except for the host
station in the loop, into the corresponding bits in the special
registers (for link) as shown below.
•Error detection is performed only for local stations other than the
host station. Remote I/O station data are "0" and are not
changed.
•Bits corresponding to the station Nos. of faulty local stations
(except for host station) turn to "1".
(Example) When local station No.12 is faulty, bit 11 in D9252
turns to "1".
By monitoring D9252, "2048 (800
H)" is identified.
•Automatically turns to "0s" when faulty stations return to normal,
or when data link returns to normal by loop line switching.
145H 325 D9253
Stores status data of
station No.17 to No.32
146H 326
D9254
*1
Stores status data of
station No.33 to No.48
147H 327
D9255
*1
Stores status data of
station No.49 to No.64
Table App.2 List of special registers (for link) (Continued)
Buffer
memory
address
(Bit No.)
No. Name Description Details
Hexad
ecimal
Decim
al
D9252
b15
b15
b14
b14
b13
b13
b12
b12
b11
b11
b10
b10
b9
b9
b8
b8
b7
b7
b6
b6
b5
b5
b4
b4
b3
b3
b2
b2
b1
b1
b0
b0
L16 L15 L14 L13 L12 L11 L10
L9 L8 L7 L6 L5 L4 L3 L2 L1
Device
Device
No.
No.
D9253
L32 L31 L30 L29 L28 L27 L26 L25L24 L23 L22 L21 L20 L19 L18 L17
D9254
L48 L47 L46 L45 L44 L43 L42 L41L40 L39 L38 L37 L36 L35 L34 L33
D9255
L64 L63 L62 L61 L60 L59 L58 L57L56 L55 L54 L53 L52 L51 L50 L49
Bit No.
Bit No.