Mitsubishi Electronics manual 210

11 TROUBLESHOOTING

MELSEC-Q

Special Register List (Continue)

ACPU

Special

Special

Corresponding

Special

Register after

Register for

Name

Meaning

Details

CPU

Conversion

Conversion

Modification

• Loopback in forward/reverse loops

Master

0: Forward loop,

station

Station 1

Station 2

Station 3

Station n

during data link

1: Reverse loop,

during data link

Forward loopback

Reverse loopback

2: Loopback

• Loopback in forward loop only

implemented in

Master

forward/reverse

station

Station 1

Station 2

Station 3

Station n

directions

D9204

SD1204

Link status

3: Loopback

implemented only

in forward

Forward loopback

direction

• Loopback in reverse loop only

4: Loopback

Master

implemented only

station

Station 1

Station 2

Station 3

Station n

inreverse direction

5: Data link disabled

Reverse loopback

Stores the local or remote I/O station number at which

QnA

loopback is being executed.

Station

Station that

Master

D9205

SD1205

implementing

implemented forward

station

Station 1

Station 2

Station 3

Station n

loopback

loopback

Forward loopback

Reverse loopback

Station

Station that

In the example of above figure, "1" is stored into

SD1205 and "3" into SD1206. If data link returns to

D9206

SD1206

implementing

implemented reverse

normal status (data link in forward loop), values stored

loopback

loopback

into SD1205, SD1206 do not return to "0". To return

them to "0", therefore, sequence program must be

used or reset operation performed.

Stores the number of retry times due to transmission

D9210

SD1210

Number of

Stored as cumulative

error.

retries

value

Count stops at maximum of "FFFFH" .

RESET to return the count to 0.

Stores the number of times the loop line has been

D9211

SD1211

Number of times

Stored as cumulative

switched to reverse loop or loopback.

loop selected

value

Count stops at maximum of "FFFFH".

RESET to return the count to 0.

Local station

Stores conditions for

Stores the local station numbers which are in STOP or

D9212

SD1212

up to numbers 1 to

PAUSE mode.

operation status

16

Device

Bit

Stores conditions for

number

b15

b14

b13

b12

b11

b10

b9

b8

b7

b6

b5

b4

b3

b2

b1

b0

Local station

SD1212

L16

L15

L14

L13

L12

L11

L10

L9

L8

L7

L6

L5

L4

L3

L2

L1

D9213

SD1213

up to numbers 17 to

SD1213

L32

L31

L30

L29

L28

L27

L26

L25

L24

L23

L22

L21

L20

L19

L18

L17

operation status

32

SD1215

L64

L63

L62

L61

L60

L59

L58

L57

L56

L55

L54

L53

L52

L51

L50

L49

SD1214

L48

L47

L46

L45

L44

L43

L42

L41

L40

L39

L38

L37

L36

L35

L34

L33

QnA

Stores conditions for

D9214

SD1214

Local station

When a local station is switched to STOP or PAUSE

up to numbers 33 to

mode, the bit corresponding to the station number in

operation status

48

the register becomes "1".

Local station

Stores conditions for

Example: When station 7 switches to STOP mode,

D9215

SD1215

up to numbers 49 to

bit 6 in SD1212 becomes "1" , and when

operation status

SD1212 is monitored, its value is "64

64

(40H)".

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