Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 272

7 APPLICATION FUNCTIONS
CPU
SEND
Control data
target station
logical channel
13
CPU
SEND
Control data
target station
logical channel
18
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(d) Program example 2 (logical channel numbers are used)
Station number 1 uses channel 2 and sends message data to the target
station storage channel number 13 (logical channel 13) using the SEND
instruction.
Station number 2 executes the RECV instruction and reads the received
data from channel 5 (logical channel 13). At the same time, station number
4 executes the RECV instruction and reads the received data from channel
6 (logical channel 13).
Station number 3 uses channel 2 and sends the message data to the target
station storage channel 18 (logical channel 18) using the SEND instruction,
but it is not received because there is no matching logical channel number.
Network module
Station No. 1
Channel 1 (logical channel 1)
Channel 2 (logical channel 2)
Channel 3 (logical channel 3)
Channel 4 (logical channel 4)
Channel 5 (logical channel 5)
Channel 6 (logical channel 6)
Channel 7 (logical channel 7)
Channel 8 (logical channel 8)
Channel 1 (logical channel 1)
Channel 2 (logical channel 2)
Channel 3 (logical channel 3)
Channel 4 (logical channel 4)
Channel 5 (logical channel 5)
Channel 6 (logical channel 6)
Channel 7 (logical channel 7)
Channel 8 (logical channel 8)
Network module
Station No. 3
Network module
Station No. 2
Channel 1 (logical channel 1)
Channel 2 (logical channel 2)
Channel 3 (logical channel 3)
Channel 4 (logical channel 4)
Channel 5 (logical channel 13)
Channel 6 (logical channel 23)
Channel 7 (logical channel 33)
Channel 8 (logical channel 8)
Network No. 7
Channel 1 (logical channel 1)
Channel 2 (logical channel 2)
Channel 3 (logical channel 3)
Channel 4 (logical channel 4)
Channel 5 (logical channel 12)
Channel 6 (logical channel 13)
Channel 7 (logical channel 7)
Channel 8 (logical channel 8)
Network module
Station No. 4
MELSEC-Q
CPU
RECV
CPU
RECV
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