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CHAPTER 3 CONNECTION OF PROGRAMMING TOOLS AND GOT
3
3.5 MELSOFT
Connection Exte
nded Setting
3.5.2 C
onvert for
m
at between
the networ
k n
umber/station number
and IP addr
ess/por
t number
3.5.2
Convert format between the network number/station number
and IP address/port number
This section provides an overview of the processing of the conversion method that is set in "Station No. <-> IP
Information Setting".
(1) Automatic response system
The automatic response system can only be specified when the CPU module is the request destination station or
relay receiving station.
There is no need to set the IP address and port number of the partner station.
When the CPU module receives other station access request message (command frame), the send source
network number, IP address, and UDP port number in the request message, are stored internally. The response
message (response) for the request message is returned to the destination IP address and UDP port number
calculated from the stored network number and station number. Therefore, by receiving the other station access
request message first, the communication partner stations can be maintained.
The maximum number of station information that can be set is 64. When more than 64 other station access
request messages are received, the CPU module starts deleting from the oldest data to store the station
information in the newly received request message. However, it is ignored if the station information is the same
as the station information already stored.
*1
*1
Information from the same station is not stored twice.
CPU
module
CPU
module
CPU
module
Request source station
Request destination station
The automatic response
system can be set.
Relay receiving station
Relay sending station
Ethernet
Previous
station
Next
station
Relay
receiving
station
Relay
sending
station
CPU
module
Relay station
Request message
Response message
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