Ras Function - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

3 SPECIFICATIONS

3.2.2 RAS function

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The RAS as in the RAS function stands for Reliability, Availability and Serviceability
and refers to the overall ease of use of the automated equipment.
(1) Automatic return function
When a station disconnected from a network due to a data link error recovers
from the error, the station is automatically reconnected to the network and
restarts data link.
1) The normal station No. 3 is disconnected
due to a data link error.
Control Sub-control
station station
(station (station
No. 1) No. 2)
Network No. 1
Normal Normal
station station
(station (station
No. 6) No. 5)
POINT
There is a limit to the number of faulty stations that can return to the system within
one link scan. For details, refer to Section 5.4, "Supplementary Settings."
2) The station No. 3 recovers to the normal
status and returns to the system.
Down
Normal
station
(station
No. 3)
Return
Normal
station
(station
No. 4)
MELSEC-Q
Control Sub-control
station station
(station (station
No. 1) No. 2)
Network No. 1
Normal Normal
station station
(station (station
No. 6) No. 5)
Return
Normal
station
(station
No. 3)
Normal
station
(station
No. 4)
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