Mitsubishi Electric MELSEC-Q Series User Manual page 341

(6) Link special register (SW)
This area stores word data indicating the data link status.
Buffer memory addresses 600
351, Appendix 3.2)
(7) Random access buffer
This area stores data to be sent to other stations. The data are read and written by transient transmission.
(8) Communication buffer
This area stores sending/receiving data when transient transmission (communications using a communication
buffer) is performed with a local station, standby master station, and intelligent device station.
The communication buffer sizes of these stations are set using the network parameter. (
7.3.2 (2))
Communications using the communication buffer
Ex.
Master station
CPU module
G(P).RIRD
Receive
buffer for the
first station
1.
The buffer memory in the local station or the device in the CPU module is accessed.
2.
The data specified in the control data is stored in the receive buffer for the first station.
Master station
CPU module
3.
G(P).RIWT
3.
The data to be written to the buffer memory in the local station or to the device in the CPU module
is stored in the send buffer for the first station.
4.
The buffer memory in the local station or the device in the CPU module is accessed.
to 7FF correspond to link special registers SW0000 to SW01FF. (
H H
1.
1.
2.
2.
4.
Send buffer
for the first
station
4.
Local station (first station)
CPU module
Buffer memory
Device
Local station (first station)
CPU module
Buffer memory
Device
APPENDICES
Page
A
Page 102, Section
339