Ip Filter Function; Application - Mitsubishi Electric QJ71E71-100 User Manual

14.3

IP Filter Function

This section describes the IP filter function.
This function is available only in the E71 with the serial number (first five digits) of "18072" or later.
14.3.1

Application

This function identifies the IP address of the access source, and prevents unauthorized access performed by IP
address specification.
The IP address of the connected device to be allowed or denied access is set in the buffer memory, and access from
connected devices is restricted.
Use of this function is recommended when using the E71 in an environment connected to a LAN line.
E71
The IP filter function is one method of preventing unauthorized access (such as program or data destruction) from external
devices. However, this function does not guarantee prevention of all unauthorized access. To have the programmable
controller system fully secured against unauthorized access from the external devices, take additional measures. Mitsubishi
Electric Corporation does not hold any responsibility for any system problems caused by unauthorized access.
The following are examples of measures against unauthorized access.
• Install a firewall.
• Install a personal computer as a relay station and control the relay of communication data using an application
program.
• Install an external device for which the access rights can be controlled as a relay station (Contact the network
provider or equipment dealer for details on the external devices for which access rights can be controlled.)
194
Ethernet
Access permitted
Access permitted
Access prohibited
External device
IP address: 192.168.1.2
External device
IP address: 192.168.1.3
External device
IP address: 192.168.1.5