Mitsubishi QJ71E71-100 Series, Руководство пользователя

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MELSEC-Q
3 WHEN COMMUNICATING WITH MELSECNET/H, MELSECNET/10
RELAY
3.3.2 Convert format between the Network No./station number and IP address/port number
The process overview of the conversion method set by the Station No. <-> IP information
screen for performing the other station access via Ethernet module using the
MELSECNET/H, MELSECNET/10 relay communication function is explained.
Select one of the conversion methods to set.
(1) Automatic response system (Convert format of Ethernet module
default value)
(a) Overview of automatic response system
1) The automatic response system differs from the other convert
format in that designations can only be made when the Ethernet
module installed station is the communication request destination
station or communication relay receiving station.
2) The partner station IP Address or port number setting are not
necessary with this conversion method, making the MELSECNET/H,
MELSECNET/10 relay communication performed easily.
Ethernet
Ethernet
Communication
relay receiving
station
Communication
relay sending
station
Communication
request source station
Communication
request destination
station
Automatic response
system setting is possible
QCPU
QCPU
Previous
station
Communication relay station
QCPU
E71
Com munication
request message
PLC
CPU
Next
station
Response
message
E71 E71
E71
Communication
relay sending
station
Communication
relay receiving
station
(b) Convert format of Automatic response system
1) When the Ethernet module receives other station access
communication request message (command frame) from the
MELSECNET/H, MELSECNET/10 relay communication function,
the send source Network No., IP address, and UDP port number in
the request message, are stored internally.
The response message (response) for the communication request
message is returned to the destination IP address and UDP port
number calculated from the stored Network No. and station number.
Therefore, by receiving the other station access communication
request message first, the communication partner stations can be
maintained.
2) The maximum number of station information that can be set is 64.
When more than 64 other station access communication request
message is received, the Ethernet module starts deleting from the
oldest data to store the station information in the newly received
message communication request message.
However, it is ignored if the station information is the same as the
station information already stored.
Information from the same station is not stored twice.