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