Last Station Number Setting; Station Status If An Error Occurs - Mitsubishi Electric MELSEC Q Series User Manual

3.5

Last Station Number Setting

The last station number is set to perform data link up to the last remote station in connection with the network and not
to perform data link with unconnected stations.
This setting is optional but useful to optimize link scan time.
For the setting,
When 16-point mode is set, the number of occupied I/O points is set to 128 points, and the last remote station in
Ex.
connection with the network is numbered as "5"
By setting "5" as the last station number, the link scan time is optimized.
3.6

Station Status if an Error Occurs

The following table lists station status if an error occurs.
The CPU module on the master
station is faulty and stopped (data
link stopped).
A remote station is faulty due to
an error such as data link error
(data link continued).
Power of a remote station is shut
off (data link continued).
*1
*2
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Page 47, Section 4.4.
Remote Remote Remote
station station station
No.1 No.2 No.3
Data link range when the last station number is set to 5
Data link range when the last station number is not set
Data link status
Input data from the
faulty remote
station are cleared.
Input data from the
de-energized
remote station are
cleared.
Although external data are input (The input LED turns on.), the data are not sent to the master station.
The status depends on the output hold setting of the remote station.
search engine
Remote Remote
station station
No.4 No.5
Master station
Remote input Remote output
Maintained Maintained
Continued
Continued
Not connected
Remote Remote Remote
station station station
No.6 No.7 No.8
Remote station
Input
*1
Continued
*1
Continued
Depends on
external signals.
Output
*2
Maintained/OFF
*2
Maintained/OFF
All OFF