Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 390

8 TROUBLESHOOTING
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[Link information]
5) Mode (SW0043)
Displays the operation mode of the host.
• Online
• Offline (debug mode)
• Offline
• Forward loop test
• Reverse loop test
• Station-to-station test (Station that executes tests)
• Station-to-station test (Station to be tested)
6) F loop status (SB0091), Loopback station (SB0099)
Displays the status of the forward loop side.
• Loop status
• Loopback
"---" is displayed in case of bus type.
7) R loop status (SB0095), Loopback station (SB009A)
Displays the status of the reverse loop side.
• Loop status
• Loopback
"---" is displayed in case of bus type.
8) Link scan time (SW006B/SW006C/SW006D)
Displays the maximum/minimum/current value of the link scan time of the
host.
Constant link scan
Yes
[Communication information]
9) Communication status (SB0047)
Displays the communication status of the host.
• Data link being executed (SB0047: Off)
• Data link stopped (SB0047: On)
: Normal/abnormal
: Unused/"executed station number"
: Normal/abnormal
: Unused/"executed station number"
Station type
Measured value
No (Displays the maximum/minimum/current value the link scan
actually took.)
Measured value
(Displays the maximum, minimum, and
current values of the times that were
actually taken. If the set value is small, the
formula in Appendix 4 (SW006B to
6D) is applied.)
MELSEC-Q
Control station Normal station
Constant link
scan ±2 ms
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