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5
ACCESS VIA NETWORK MODULES
5.3 MELSECNET/H Module Access Function
5.3.1 Message communication
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Remark
For the bus interface functions and MELSEC data link functions, refer to the
following manual.
C Controller Module User's Manual (Utility Operation, Programming)
(3) Message communication example
The following a message communication example.
1) The C Controller module sends a message using a message sending function
in the user program.
2) Station No.4 sends the message, by the message sending function in the user
program and using channel 3, to the target station data storage channel 5 of
station No.5 (logical channel 5).
3) The C Controller module (another station) automatically checks the message
stored in station No.5, and stores the message into its own internal receive
buffer.
4) The C Controller module (another station) reads the message from the internal
receive buffer using a message receiving function.
Figure 5.12 Message communication example
Logical channel 1 (Channel 1)
Logical channel 2 (Channel 2)
Logical channel 3 (Channel 3)
Logical channel 4 (Channel 4)
Logical channel 5 (Channel 5)
Logical channel 6 (Channel 6)
Logical channel 7 (Channel 7)
Logical channel 8 (Channel 8)
ret = QBF_RECV();
ret = mdReceive();
ret = QBF_SEND();
ret = mdSend();
MELSECNET/H
MELSECNET/H
1)
2)
3)
4)
C Controller module
User program
or
module (Station No.4)
Channel 1
Channel 2
Channel 3
Channel 4
Channel 5
Channel 6
Channel 7
Channel 8
Network No.1
module (Station No.5)
C Controller module
(another station)
User program
Internal
message
receive buffer
or
1st
2nd
127th
128th
Содержание Q06CCPU-V
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