Transient Transmission Function (Non-Periodical Communication) - Mitsubishi Electric MELSEC Q Series Reference Manual

7 APPLICATION FUNCTIONS

7.1 Transient Transmission Function (Non-Periodical Communication)

GX Developer
7
Request
source
1R1 1R2
Network No. 1
1R4 1R5
7 - 2
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
1R1
1R4
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.
1R3
Required
Relay station
1M 2M 1
R P
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).
1R2 1R3
Network No. 1
1R5 1M
R
destination
Required
Relay station
2N 3
S
Network No. 2
2N 2
S
· · · Locations requiring routing parameters
MELSEC-Q
Request
3M 1 3N 2
P S
Network No. 3
3N 3
3N 4
S S
7 - 2