Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 195

6 PROGRAMMING
No. Name
Indicates the communication status between the network module
SB0020 and CPU module.
Module status
(32) Off: Normal
On: Abnormal
Indicates the host's baton pass status (transient transmission
enabled).
Off: Normal
SB0047 Baton pass status
On: Abnormal
(71) (host)
When an error is identified, the cause of the error can be checked
in Baton pass status (host) (SW0047) and Cause of baton pass
interruption (SW0048).
Indicates the host's data link operation status.
Off: Normal
SB0049 Host data link
On: Abnormal
(73) status
When an error is identified, the cause of the error can be checked
in Cause of data link stop (SW0049).
Indicates the baton pass status of each station. (Not applicable to
reserved stations and the station with the maximum station number
or higher)
Off: All stations normal
1
Baton pass status On: Faulty station exists
SB0070
of each station When any faulty station exists, each station status can be checked
(112)
in Baton pass status of each station (SW0070 to SW0073).
Depending on the timing of the link refresh, Baton pass status of
each station (SW0070 to SW0073) and the update may be offset
by one sequence scan.
Indicates the cyclic transmission status of each station. (Not
applicable to reserved stations and the station with the maximum
station number or higher)
Off: All stations are executing data linking
1 Cyclic transmission On: Stations that are not executing data linking exist
SB0074 status of each When any non-executing station exists, each station status can be
(116) station checked in Cyclic transmission status of each station (SW0074 to
SW0077).
Depending on the timing of the link refresh, Cyclic transmission
status of each station (SW0074 to SW0077) and the update may
be offset by one sequence scan.
Stores the baton pass status of each station (Including the host).
<Online>
0: Normal (including the stations with the maximum station
1: Abnormal
1
<Offline test>
SW0070
0: Normal
(112)/
1: Abnormal (including the stations with the maximum station
SW0071
Baton pass status
(113)/
of each station
SW0072
(114)/
SW0070
SW0073
SW0071
(115)
SW0072
SW0073
1: Valid only when SB0047 is off. When it turns on (error), the last data are retained.
6 - 2
List of Interlock Devices
Description
number and smaller numbers as well as reserved stations)
number and smaller numbers as well as reserved stations)
to
b15 b14 b13 b12 b4
16 15 14 13 to 5
32 31 30 29 to 21
48 47 46 45 to 37
64 63 62 61 to 53
Numbers 1 to 64 in the above table
indicate the station numbers.
Control
station
Loop Bus
b3 b2 b1 b0
4 3 2 1
20 19 18 17
34
36 35 33
52 51 50 49
[Availability column] Loop: optical loop, Bus: coaxial/twisted bus
MELSEC-Q
Use permitted/prohibited
Remote
Normal Remote I/O
master
station station
station
Loop Bus Loop Bus Loop Bus
: Available, : Not available
6 - 2
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