Message Sending Function Using The Logical Channel Numbers - Mitsubishi Electric Melsec QJ71LP21 Reference Manual

7 APPLICATION FUNCTIONS

7.4.4 Message sending function using the logical channel numbers

QCPU
Receive
command
J.RECV
Device memory
QCPU QJ71
Power
supply
module
7 - 28
The message sending function using the logical channel numbers
there are many kinds of information and the receiving station side needs to selectively
receive only some of the send messages.
The sending station side is equivalent to a broadcast station that delivers messages to
logical channels, and the receiving station side is equivalent to a television receiver in
an ordinary household that can switch between logical channels.
The sending station side executes the transient transmission by attaching an address
for a logical channel without specifying a specific station number (although
specification of station numbers is also possible). All the other stations on a single
network receive the send data, and then the receiving stations delete the messages
except for the messages whose logical channel number matches with the one set by
the receiving stations.
1: The logical channel refers to an input channel that can be changed by the
sequence program. There are eight physical input channels, but up to 64
channel numbers can be set by modifying the link special register value.
(1) Visual representation of the function
When the message is sent from the network module
the network modules
The network module
set there.
Receive
command
QJ71BR11
Device memory
Channel 1
2
Receive side
3
Logical
channel 15
8
channel 14
Power
channel 12
channel 10
supply
channel 9
module
A
BR11
Power
supply
module
Create data
command
Send
command
Device memory
Send message data
, where logical channel 9 has been set can receive it.
A
C
does not receive it since logical channel 9 has not been
B
QCPU QJ71BR11
Channel 1
2
Receive side
3
Logical
J.RECV
channel 15
8
channel 14
channel 12
channel 10
channel 13
B
QCPU QJ71
BR11
Power
supply
module
D
QCPU QJ71
BR11
QCPU QJ71BR11
Send
Channel 1
message
2
Receive side
data creation
3
Logical
channel 1
8
J.SEND channel 9
channel 10
channel 12
channel 15
MELSEC-Q
1
to logical channel 9, only
D
QCPU QJ71BR11
Channel 1
Receive side
Receive
command
Logical
J.RECV
channel 15
channel 14
channel 12
Device memory
C
QCPU QJ71
BR11
is useful when
2
3
8
channel 16
channel 9
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