Mitsubishi Electric MELSEC iQ-F Series User Manual page 45

■DNS settings that are set to the Ethernet module
When the DNS setting change function is used, instead of the IP addresses of the DNS servers configured with the module
parameters in the engineering tool, the IP addresses of the DNS servers stored in the DNS setting storage area are set to the
* 1
Ethernet module.
*1 Check 'E-mail setting change function enable flag' (Un\G4374) to find out which setting is being used.
Powering off and on the system or resetting the CPU module reflects the IP addresses of the DNS setting storage area to the
Ethernet module. If no DNS settings are stored in the DNS setting storage area, the IP addresses of the DNS servers
configured with the module parameters in the engineering tool are set to the Ethernet module.
Ex.
The following figure shows a case where the IP addresses of DNS servers 1 to 4 are set from the DNS setting storage area to
the Ethernet module, resulting in the IP addresses of DNS servers 1 to 4 being set to 192.0.2.5 to 192.0.2.8.
Ethernet module
DNS server 1 address 192.0.2.5
DNS server 2 address 192.0.2.6
DNS server 3 address
192.0.2.7
DNS server 4 address 192.0.2.8
Values in the DNS setting storage areas are set.
■Procedure for writing data to the DNS setting storage area
The following describes the procedure for writing data to the DNS setting storage area to change the DNS settings in the
Ethernet module.
1.
Store new IP addresses in the DNS server address areas (Un\G4390 to Un\G4397).
2.
Write 1 to 'DNS setting storage area write request' (Un\G4398).
3.
Check the write result with the following buffer memory areas.
Buffer memory address Name
Un\G4399.b0 DNS setting storage area write completed
Un\G4399.b1 DNS setting storage area write error
Un\G4403 DNS setting storage area write error code
4.
When the write processing is completed successfully, power off and on the system or reset the CPU module.
5.
Check the IP addresses of the DNS servers with the DNS server address areas (Un\G4390 to Un\G4397).
If the stored values are invalid or no values are set, the values configured with the module parameters are set
as the DNS settings for the Ethernet module.
If valid values are already stored in the DNS setting storage area, they are set as the DNS settings as-is.
If the write processing for the DNS setting storage area is not completed successfully, the error code (1940H)
is stored in 'DNS setting storage area write error code (Un\G4403).
Module parameter
DNS server 1 address
DNS server 2 address
DNS server 3 address
DNS server 4 address
DNS setting storage area
DNS server 1 address
DNS server 2 address
DNS server 3 address
DNS server 4 address
When completed successfully
On
Off

192.0.2.1
192.0.2.2
192.0.2.3
192.0.2.4
192.0.2.5
192.0.2.6
192.0.2.7
192.0.2.8
When completed with an error
On
On
Error code
4 FUNCTION LIST
4.3 Other Functions
4
43