JLCooper ES-450SPE - Manual (Page 7)

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3. Assign an IP Address to the Controller.
The Ethernet interface in your JLCooper Controller is capable
of automatically obtaining an IP address from a DHCP server.
If you have a DHCP server on your network, you will see a
DHCP assigned IP address. Because it is possible for DHCP
assigned IP addresses to expire and get assigned to other
devices, it is strongly recommended that you manually assign a
fixed IP address to the controller.
In the Device Installer window, highlight the item that matches
the Hardware (MAC) Address of your controller.
Click on Assign IP and follow the directions in the following
dialog boxes.