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MELSEC-Q
7 APPLICATION FUNCTIONS
7.1 Transient Transmission Function (Non-Periodical Communication)
The transient transmission function performs data communication only when it is
requested between stations.
The transient transmission function can be requested with the link dedicated
instructions (REMFR, REMTO, READ and WRITE) 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
GX Developer
1R21R1
1R51R4
1R3
1M
R
Network No. 1
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.
When the source of the request is a remote I/O station, there is no need to set the
"routing parameters" in the remote I/O station of the request source.
GX Developer
1R2
Network No. 1
Request
source
1M
R
2M
P
1
Relay station
3M
P
1
3N
S42NS3
3N
S
2
3N
S3
2N
S2
· · · Locations requiring routing parameters
Required
1R1 1R3
1R4 1R5
Relay station
Required
Request
destination
Network No. 2
Network No. 3
POINT
A remote I/O station can only become a request source and request destination.
Do not set the relay station.
For details about routing, refer to the Q corresponding MELSECNET/H Network
System Reference Manual (PLC to PLC network).
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