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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
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
inreverse direction
5: Data link disabled
• Loopback in forward/reverse loops
Master
station
Station 1
Station 2
Station 3
Station n
F
orward loopback Reverse loopback
• Loopback in forward loop only
Master
station
Station 1
Station 2
Station 3 Station n
Forward loopback
• Loopback in reverse loop only
Master
station
Station 1
Station 2
Station 3
Station n
Reverse loopback
D9205 SD1205
Station
implementing
loopback
Station that
implemented forward
loopback
D9206 SD1206
Station
implementing
loopback
Station that
implemented reverse
loopback
Stores the local or remote I/O station number at which
loopback is being executed.
Master
station
Station 1
Station 2
Station 3
Station n
Forward loopback Reverse loopback
In the example of above figure, "1" is stored into
SD1205 and "3" into SD1206. If data link returns to
normal status (data link in forward loop), values stored
into SD1205, SD1206 do not return to "0". To return
them to "0", therefore, sequence program must be
used or reset operation performed.
D9210 SD1210
Number of
retries
Stored as cumulative
value
Stores the number of retry times due to transmission
error.
Count stops at maximum of "FFFF
H
" .
RESET to return the count to 0.
D9211 SD1211
Number of times
loop selected
Stored as cumulative
value
Stores the number of times the loop line has been
switched to reverse loop or loopback.
Count stops at maximum of "FFFF
H
".
RESET to return the count to 0.
QnA
D9212 SD1212
Local station
operation status
Stores conditions for
up to numbers 1 to
16
D9213 SD1213
Local station
operation status
Stores conditions for
up to numbers 17 to
32
D9214 SD1214
Local station
operation status
Stores conditions for
up to numbers 33 to
48
D9215 SD1215
Local station
operation status
Stores conditions for
up to numbers 49 to
64
Stores the local station numbers which are in STOP or
PAUSE mode.
SD1212
SD1213
SD1214
SD1215
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
L10L9L8L7L6L5L4L3L2L1
Bit
Device
number
When a local station is switched to STOP or PAUSE
mode, the bit corresponding to the station number in
the register becomes "1".
Example: When station 7 switches to STOP mode,
bit 6 in SD1212 becomes "1" , and when
SD1212 is monitored, its value is "64
(40
H
)".
QnA