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6 PROGRAMMING
6.5 Using the Link Special Relays (SB)/ Link Special Registers (SW)
6 - 16
The data linking information is stored in the link special relays (SB)/registers (SW).
They can be used by the sequence programs, or used for investigating faulty areas
and the causes of errors by monitoring them.
The following table shows which SB and SW can be used to check which information.
For more details, see Appendixes 2 and 3.
(1) The following SB and SW provide the information about the host
Item
CPU status of the host
Execution status of the dedicated link instruction
Operation status of the network module
Setting status of the network module
Running status of the network module
(2) The following SB and SW provide the information about the entire
network
Item
Remote master station CPU operation status
(RUN/STOP)
Operation status of each station (moderate or major
error)
1
Operation status of each station (minor error)
Cyclic transmission status of each station
Link scan, communication mode
Setting information of the network
Running information of the network
Line status
1 : The minor, moderate, and major error levels indicate the following errors.
1) Minor error
2) Moderate error : error under which operation is stopped (parameter error,
3) Major error
1
: error under which operation is continued (I/O verification
error and so on)
WDT error and so on)
: error under which operation is stopped (hardware error and
so on)
MELSEC-Q
SB
SB004A
H
SW004B
SB004B
H
SW0031
SW0033
SW0035
SW0037
—
SW0039
SW003B
SW003D
SW003F
SB0020
SW0020
H
SB0040
SW0040
H
SB0042
to 44
SW0042
H
H
SB0058
SW0054
H
SB0064
SW0059
H
SB0068
to 69
SW0064
H
H
SB0047
to 49
SW0047
H
H
SB
SB0085
H
SB0080
SW0080
H
SB0088
SW0088
H
SB0074
to 76
SW0074
H
H
SB0068
SW0068
H
SB0069
SW006B
H
SB0054
to 56
H
H
SB0058
H
SW0054
SB0064
H
SB0068
to 6B
H
H
SB0070
SW0070
H
SB0090
to 92
H
H
SB0095
to 96
SW0090
H
H
SB0099
to 9A
H
H
SW
H
H
H
H
H
H
H
H
H
H
H
to 46
H
H
to 57
H
H
to 5B
H
H
to 68
H
H
to 4A
H
H
SW
—
to 83
H
H
to 8B
H
H
to 77
H
H
H
to 6D
H
H
to 68
H
H
to 73
H
H
to 9F
H
H
6 - 16
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