Transient Transmission Function (Non-Periodical Communication) - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

7 APPLICATION FUNCTIONS

7.4 Transient Transmission Function (Non-Periodical Communication)

1M 1
P
Network No. 1
1N 6
S
7 - 16
The transient transmission function performs data communication only when it is
requested between stations.
The transient transmission function can be requested with the dedicated link
instructions (SEND, RECV, READ, SREAD, WRITE, SWRITE, REQ, ZNRD, ZNWR,
RECVS, RRUN, RSTOP, RTMRD and RTMWR), GX Developer, the intelligent
function module, etc.
In the MELSECNET/H, data communication can be performed with other stations
having the same network number (the same network as where the host is connected),
as well as with stations having other network numbers.
1) Transient transmission function to a station on the same network
1M 1
P
1N 6
S
2) Transient transmission to stations on other networks (routing function)
In this case, the routing parameters must be set for the request source
and relay stations.
GX Developer
Required
Request
source
1N 2 1N 3
S S
Relay station
1N 5 1N 4 2M 1
S S P
GX Developer
1N 2 1N
S
Network No. 1
1N 5 1N
S
Required
Required
Relay station
Network No. 2
2N 2
S
MELSEC-Q
3
S
4
S
Request
destination
3M 1 3N
P S
Network No. 3
2N 3 3N 4
3N
S S S
Stations for which the routing
parameters are set
2
3
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