Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 355

7 APPLICATION FUNCTIONS
GX Developer
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(1) Stop/startup operation within a network
The following shows an example in which 1M
and then restarts the data link.
(a) Stop
Stop the cyclic transmission of 1Ns2 with GX Developer.
GX Developer
(b) Restart
There are two methods to restart the cyclic transmission of the stopped
station: "Link startup" and "Forced link startup."
1) In case of "Link startup"
The stopped station (1N
(1M
P
The link cannot be started from stations (such as the host, 1N
1N 4) other than the stop requesting station.
S
Link startup
1M 1
P
1N 4
S
2) In case of "Forced link startup"
The cyclic transmission of the stopped station (1N
started from stations (including the host) other than the stop requesting
station.
This startup method is used when the stop requesting station is down.
The startup can be executed from the host as well as other stations
regardless of the stopped station.
However, the forced startup cannot be executed per station while the
link is stopped by specifying all stations at the same time (specifying
the host or one station).
1M 1
GX Developer
P
GX Developer 1N 4
S
Link stop
1M 1
P
1N 4
S
2) can be restarted only from the station
S
1) that stopped the link.
Host
1N 2
S
1N 3
S
Host
Forced link startup
1N
1N
1 issues a stop request to 1N
P
1N 2
S
1Ns3
Link startup possible
Link startup not possible
2) can also be
S
GX Developer
2
S
3 GX Developer
S
MELSEC-Q
2
S
3 and
S
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