App - 81
Appendix 2 Special Register List
APPENDICES
(12)Special register list dedicated for QnA
TableApp.30 Special register
ACPU
Special
Register
Special
Register
after
Conversion
Special
Register for
Modification
Name Meaning Details
Corresponding
CPU
D9200 SD1200
–
ZNRD
instruction
processing
result
(LRDP for
ACPU)
0 : Normal end
2 : ZNRD instruction
setting fault
3 : Error at relevant
station
4 : Relevant station
ZNRD execution
disabled
Stores the execution result of the ZNRD (word device read)
instruction
• ZNRD instruction setting fault.... Faulty setting of the ZNRD
instruction constant, source, and/
or destination.
• Corresponding station error....... One of the stations is not
communicating.
• ZNRD cannot be executed in the corresponding station.....
The specified station is a remote I/
O station.
QnA
D9201 SD1201
–
ZNWR
instruction
processing
result
(LWTP for
ACPU)
0 : Normal end
2 : ZNWR instruction
setting fault
3 : Error at relevant
station
4 : Relevant station
ZNWR execution
disabled
Stores the execution result of the ZNWR (word device write)
instruction.
• ZNWR instruction setting fault... Faulty setting of the ZNWR
instruction constant, source, and/
or destination.
• Corresponding station error....... One of the stations is not
communicating.
• ZNWR cannot be executed in the corresponding station .....
The specified station is a remote I/
O station.
D9202 SD1202
–
Local station
link type
Stores conditions for
up to numbers 1 to 16
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.
D9203 SD1203
–
Stores conditions for
up to numbers 17 to
32
D9204 SD1204
–
Link status
0 : Forward loop,
during data link
1 : Reverse loop,
during data link
2 : Loopback
implemented in
forward/reverse
directions
3 : Loopback
implemented only
in forward
direction
4 : Loopback
implemented only
in reverse
direction
5 : Data link disabled
Stores the present path status of the data link.
• Data link in forward loop
• Data link in reverse loop
• Loopback implemented in forward/reverse directions
SD1202
SD1203
SD1241
SD1242
Bit
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
Device
number
Forward loop
Reverse loop
Station
No. n
Station
No.2
Station
No.1
Master
station
Forward loop
Reverse loop
Station
No. n
Station
No.2
Station
No.1
Master
station
Forward loopback
Reverse loopback
Station
No. n
Station
No.2
Station
No.3
Station
No.1
Master
station
To Next Page
Loading...
Need help?
General
