Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 474

APPENDICES
No. Name
7
SW00D0
(208)
Loop switch data
to
SW00DF
(223)
7 8
SW00E0
(224)
Switch request station
to
SW00E7
(231)
2
SW00E8
(232)
Module type of each
to
station
SW00EB
(235)
2 Low-speed cyclic
SW00EC transmission start
(236) execution results
2: Valid only when the SB0047 is off. When it turns on (error), the last data are retained.
7: To reset the SW00CE to SW00E7, turn on the SB0009.
8: For the loop switch request station, stations other than the ones at both ends of the loop may be stored because the loop switch request is issued by the
station that first detected the loop error.
App - 35
Table 4 Link special register (SW) list (continued)
Description
Stores the cause and status of the loop switch.
Whether the data are overwritten or retained is set in the
common parameters.
b15 to b8 b7 b6 b5 b4 b3 b2 b1 b0
SW00D0
to to
SW00DF
Status after switching
<Cause> The bit corresponding to each error is set to 1.
All 0: Return direction
b0: Forward loop H/W error
b1: Reverse loop H/W error
b2: Forward loop forced error
b3: Reverse loop forced error
b4: Forward loop continuous
communication error
b5: Reverse loop continuous
communication error
b6: Forward loop continuous line
error
b7: Reverse loop continuous line
error
Turning ON Clear loop switch count (SB0009) clears the stored
value.
Stores the number of the stations that requested the loop switch.
b15
to
SW00E0
to
SW00E7
Odd numbered
switch station
Turning ON Clear loop switch count (SB0009) clears the stored
value.
Stores each station's module type.
0: MELSECNET/10 module
1: MELSECNET/H module
b15 b14 b13 b12
SW00E8 16 15 14 13
SW00E9
32 31 30 29
SW00EA 48 47 46 45
SW00EB 64 63 62 61
Stores execution results for low-speed cyclic transmission start
execution results.
0 : Test normal
Other than 0 : Test error content (Refer to the error codes in
Section 8.3)
Cause
< Status after the
switching>
0: Multiplex transmission
(Forward
loop/reverse loop
normal)
1: Data link by forward
loop
2: Data linking by
reverse loop
3: Data linking by
loopback
b8 b7 b0
to
Even numbered
switch station
to b4 b3 b2 b1 b0
to 5 4 3 2 1
to 21 20 19 18 17
to 37 36 35 34 33
to 53 52 51 50 49
Numbers 1 to 64 in the above table
indicate the station numbers.
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Use permitted/prohibited
Remote
Control Normal
master
station station
station
Loop Bus Loop Bus Loop
: Available,
Remote I/O
station
Bus Loop Bus
: Not available
App - 35