Combination System; Subnet Mask Pattern; Conversion Settings - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

■Combination System

This system combines the IP address calculation system and the table conversion system.
Select this system when accessing other stations with the same network number, accessing other stations in other networks
or Ethernet with different network number, or relaying from other networks to the Ethernet network system.
The set target Ethernet-equipped module can be installed either at a communication request source station, communication
relay station, or communication request destination station.
Conversion processing of the combination system is as below.
• When a communication request message (command frame) to access other station is received, the communication request
message is sent to the next station obtained by the table conversion system at first.
• If the IP address of the external device cannot be retrieved by the table conversion system, the IP address is retrieved by
the IP address calculation system to send the communication request message.
• The response message (response) to the communication request message is returned based on the return IP address and
data in the conversion table, or the stored data.
The relationship between the conversion method and the definition of the Ethernet-equipped module mounted station is as
follows.
: Can be set, : Cannot be set
Conversion method
Automatic Response System
IP Address Calculation
System
Table Conversion System
Combination System
*1 For the external device that completed the communication, the station can be a communication request source station or a relay sending
station.

Subnet Mask Pattern

Specify the mask value based on the guidelines given below. This pattern is used in a logical sum with the own station IP
address when calculating the IP address of the external device using the IP address calculation system.
When setting the subnet mask, specify the target settings of the IP address class, network address, and subnet address so
that all bits are "1" in the mask pattern.
Specify the mask pattern with a decimal/hexadecimal value obtained by dividing the 32-bit mask value into 8-bit segments.
When the subnet mask is not specified, the mask pattern setting is not necessary. The following mask value is used as the
mask pattern according to the own station IP Address class.
Class
Class A
Class B
Class C

Conversion Settings

The conversion setting is required to obtain the IP address from the network number and station number using the table
conversion system.
If the own station is an Ethernet-equipped module and the next station to which the communication request/response
message is passed to access other station is also an Ethernet-equipped module, specify the network number, station number,
and IP address of the Ethernet-equipped module of the next station.
2 PARAMETER SETTINGS
272
2.3 Application Settings
Ethernet-equipped module mounted station definition
Communication Communication relay station
request source station
Relay receiving station
*1
 
 
 
 
Relay sending station
*1




Mask value used
FF.00.00.00H
FF.FF.00.00H
FF.FF.FF.00H
Communication
request destination
station



