Mitsubishi MELSEC-A Series Reference Manual page 301

10. TROUBLESHOOTING
(1)
(2)
(3)
(4)
Displaying host station operation mode (M9224, M9227)
(a) Displays operation status of the master station
1) ON-LINE: Master station mode setting is ON-LINE (with/without automatic
return function).
2) OFF-LINE: Master station mode setting is OFF-LINE, SELF-LOOPBACK
TEST, or STATION-TO-STATION TEST.
3) LOOP TEST: Master station mode setting is FORWARD LOOP TEST or
REVERSE LOOP TEST.
Displaying loop line status of the host station (M9225, M9226)
(a) Displays the forward loop line (F loop) and reverse loop line (R loop) status of
the master station.
1) OK: Loop line is normal.
2) NG: Loop line is faulty.
Displaying link scan time (D9207 to D9209)
(a) Displays the time required for data link between the master station and all slave
stations.
1) MAX.: Displays the maximum value of time required for data link.
2) MIN.: Displays the minimum value of time required for data link.
3) PRESENT: Displays the present value of time required for data link.
Displaying loop status of data link system (D9204 to D9206)
(a) The Table 10.1 shows the present loop status.
Data link status
Data link disabled
Table 10.1 Data link status display
10 - 3
GPP/PHP display screen