Mitsubishi Electric Q Series Reference Manual page 239

7 APPLICATION FUNCTIONS
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POINT
(1) In order to improve the reliability of data, it is recommended to execute
instructions by setting the execution type to "With arrival confirmation."
(2) If the communication itself is normally completed when the execution type is
set to "No arrival confirmation," the sending is considered as being normally
completed by the sending station even if the contents of the send data are
abnormal.
In addition, even if the contents of the send data are normal, when an
instruction is executed to the same station from multiple stations, a "No free
area in the receive buffer error (F222
the sending station completes normally.
(3) When sending data to the same channel of the receiving station, execute the
sending after the receiving station reads data using the RECV instruction.
If the sending station sends data to the same channel of the receiving station
before the receiving station reads data using the RECV instruction, an error
will occur.
CPU
(Sending station)
SEND
to
SEND
(4) As the target station of data sending, specify the network number and station
number of the network module or Ethernet module that will receive a request
from the sending station.
: In the following diagram, specify the network number and station number
of the first network module.
You cannot execute the SEND instruction after specifying any module
other than the network module or Ethernet module that will receive a
request from the sending station.
: In the following diagram, you cannot execute the SEND instruction after
specifying the network number and station number of the second network
module.
(Sending station) CPU
)" may occur in the target station but
H
Network module
Channel 3
Error
Network No.1
Network
CPU
module
(Target station)
SEND
MELSEC-Q
Network module
(Receiving station)
Logical channel
(channel 5)
Network No.2
Network Network
module module
(First module) (Second module)
CPU
RECV
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