Using The Link Special Relays (Sb)/ Link Special Registers (Sw) - Mitsubishi Electric QJ71LP21 Reference Manual

6 PROGRAMMING

6.5 Using the Link Special Relays (SB)/ Link Special Registers (SW)

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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
SB0020 SW0020
H
SB0040 to 44 SW0040
H H
SB0058 to 69 SW0054
H H
SB0047 to 49 SW0047
H H
SB
SB0085
H
SB0080 SW0080
H
SB0088 SW0088
H
SB0074 to 76 SW0074
H H
SB0068
H
SW0068
SB0069
H
SB0054 to 69 SW0054
H H
SB0070 SW0070
H
SB0090 to 9A SW0090
H H
SW
H
to 3F
H H
H
to 46
H H
to 68
H H
to 4A
H H
SW
—
to 83
H H
to 8B
H H
to 77
H H
to 6D
H H
to 68
H H
to 73
H H
to 9F
H H
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