Automatic Response System - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

■Automatic Response System

This system differs from the other conversion method in that specification can only be made when the own station is the
communication request destination station or communication relay receiving station.
Relay communications via other networks can be performed easily because the IP address and port number of the destination
station are not required to be set.
Communication relay receiving station
The automatic response
system can be set.
Communication
Previous
request message
station
Conversion processing of the automatic response system is as below.
• When receiving the communication request message (command frame), the Ethernet-equipped module internally stores
the send source network number, IP address, and UDP port number in the request message, as the station information.
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 number and station number. Therefore, by receiving the other station
access communication request message first, the communication destination stations can be maintained.
• The maximum number of station information that can be set is 120. When more than 120 other station access
communication request messages are received, the Ethernet-equipped 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.)
Communication request source station
CPU
module
Communication relay sending station
RJ71 RJ71
CPU
module EN71 EN71
Communication request destination station
Communication relay station
Communication Communication
relay receiving relay sending
station station
RJ71
EN71
Ethernet
Ethernet
RJ71
CPU
module EN71
Next
Response station
message
2 PARAMETER SETTINGS
2.3 Application Settings
2
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