Mitsubishi MELSEC-A Series Reference Manual page 102

5. SPECIFICATIONS
When MELSECNET/B data link system is used
(1) Events checked by the master station
(a) Data communication status with a slave station (local station and remote I/O
station)
• Stores stations in which a communication error occurs. (D9228, D9229)
• Stores stations at which initial communication, necessary for starting
communication, has not been completed. (D9224 and D9225)
• Stores the operating state (RUN/STEP-RUN or STOP/PAUSE) of a local
station. (D9212, D9213)
(b) Link parameter error
• Checks if the link parameters for the host station is not set, or the data has an
error. (M9206)
• Checks consistency (whether the B/W assignment range overlaps) between
link parameters set for a slave station (master station for the third tier) and
those set for the host station. (M9207)
(c) Number of communication errors
• Stores the accumulated number of retries due to transmission errors. (D9210)
• Stores the accumulated number of receive errors. (D9240)
(d) Link card hardware fault (M9210)
(e) Mode setting switch setting status of link card
• Checks if the mode switch is set to online (0 or 1) or offline (2 to 7). (M9224)
(f) Data link status
Stores the data link status. (D9204)
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