Mitsubishi Electric Melsec Q Series User Manual page 209

6 DEDICATED INSTRUCTIONS
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POINT
(1) The send data storage device (S2) requires a continuous free area equal to or
greater than the send data length ((S1) + 9) (maximum of 960 words).
(2) In order to increase the reliability of the data, it is recommended to execute the
instruction by setting the execution type to "With arrival confirmation" when a
number from one to 120 is designated for the target station number.
When 81 to A0 or FF
H H
should be executed by setting the execution type to "No arrival confirmation."
(3) When sending data to the same channel of the receive station, do so after the
receive station reads data using the RECV instruction.
If the communication itself is normally completed when the execution type is
set to "No arrival confirmation," the send is considered normally completed on
the send station even if the contents of the send data are abnormal.
In addition, even if the contents of the send data are normal, when the
instruction is executed to the same station from multiple stations, a timeout
error (C083 ) will occur on the send station.
H
(4) When the execution type is set to "With arrival confirmation," if the send station
sends data to the same channel of the receive station before the receive
station reads data using the RECV instruction, a buffer full-error will occur on
the send station side.
Programmable
controller CPU
(send station)
SEND
SEND
(5) Designate the target station sending data with the network No. and station No.
of the network module or Ethernet module receiving the request from the send
station.
In the diagram below, designate the network No. and station No. of the first
Ethernet module.
The SEND instruction cannot be executed if a network module or Ethernet
module other than the one receiving the request from the send station is
designated.
In the diagram below, the SEND instruction cannot be executed if the
network No. and station No. of the second Ethernet module is designated.
(Send station)
(6) The number of resends ((S1) + 7) must be set at every instruction execution.
is designated for the target station number, the instruction
H
Ethernet/
N/W module
Channel 3
Error
Network No.1
Ethernet
CPU CPU
module
(Target
SEND
station)
MELSEC-Q/L
Programmable
Ethernet/ controller CPU
N/W module (receive station)
Channel 5
Network No.2
Ethernet Ethernet
module module
(1st) (2nd)
RECV
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