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MELSEC-Q
7 APPLICATION FUNCTIONS
(1) Stop/startup operation within a network
The following shows an example in which 1MP1 issues a stop request to 1NS2
and then restarts the data link.
(a) Stop
Stop the cyclic transmission of 1Ns2 with 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
S2) can be restarted only from the station
(1M
P1) that stopped the link.
The link cannot be started from stations (such as the host, 1N
S3 and
1N
S4) other than the stop requesting station.
2) In case of "Forced link startup"
The cyclic transmission of the stopped station (1N
S2) can also be
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
P
1
1NS2
1N
S41Ns3
GX Developer
Link stop
1M
P
1
1NS2
1N
S41NS3
Link startup
Host
Link startup possible
Link startup not possible
GX Developer
1M
P
1
1NS2
1N
S41NS3
Forced link startup
Host
GX Developer
GX Developer
GX Developer
GX Developer
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