Mitsubishi Electric MELSEC Q Series User Manual page 238

(4) Buffer memory access
Buffer memory access is a method to access network module buffer memory from the user program. Buffer
memory data are refreshed with link device(s) and cyclic-transmitted to the other stations.
C Controller module
/* Data writing */
ret = QBF_ToBuf();
/* Data read-out */
ret = QBF_FromBuf();
(5) Message communication
The message communication function (Page 221, Section 13.3.1) can be used by the C Controller module
via the controlled CC-Link IE Field Network master/local module.
Remark
For accessible range, refer to the following.
Page 366, Section 22.5
(a) umber of channels and Internal buffer for message reception
Up to 2 channels can be used for message communication by the CC-Link IE Field Network master/local
module, and the capacity of the internal buffer for message reception is for 8 modules.
Sending side
C Controller module
User program
ret = QBF_SEND();
or
ret = mdSendEx();
236
User program
Buffer memory access
CC-Link IE Field
Network module
(Station No.4)
Channel 1
Channel 2
Network No.1
CC-Link IE Field Network
master/local module
Link device
RX
RY
RWw
Buffer memory
CC-Link IE Field
Network module
(Station No.5) C Controller module (other station)
Internal buffer for
Channel 1
message reception
Channel 2
1st
2nd
127th
128th
RWr
SB
SW
Receiving side
User program
ret = QBF_RECV();
or
ret = mdReceiveEx();