Mitsubishi Electric Q12DCCPU-V User Manual page 194

5
ACCESS VIA NETWORK MODULES
ret = QBF_RECV();
or
ret = mdReceive();
5
- 40 5.4 CC-Link IE Controller Network Module Access Function
5.4.1 Message communication
(a) Internal buffer for message reception
1) The internal buffer for message reception stores the data received from the
CC-Link IE controller network module controlled by the C Controller module.
2) The internal receive buffer has areas for four CC-Link IE controller network
modules, and up to 128 received data can be stored in each area.
If data are received when the buffer area has been full of received data, they
will be discarded instead of being stored in the buffer.
Therefore, read received data before the number of the data stored in the
internal receive buffer exceeds 128.
3) In message reception, data of the channel specified in the message receiving
function are retrieved from the data stored in the internal buffer.
C Controller module
User program
for message reception
CC-Link IE controller network module
(For second module)
(For third module)
(For fourth module)
Figure 5.38 Internal buffer for message reception
Internal buffer
1st
2nd
127th
128th
1st
2nd
127th
128th
1st
2nd
127th
128th
1st
2nd
127th
128th
CC-Link IE controller network module (First module)
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
CC-Link IE controller network module
(Second module)
CC-Link IE controller network module
(Third module)
CC-Link IE controller network module
(Fourth module)