The PK controller supports redundant device network connections through its Ethernet ports on the carrier. With redundant networks, the controller attempts communications with a device on the device's primary address first. If the primary address fails, it attempts communications on the device's secondary address (must be configured to be a redundant network on the device).
You must enable the controller's device network ports through the controller's Properties dialog's General tab.
Redundant device networks require that you configure the primary and secondary device networks to be on separate subnets. Additionally, all devices that are connected to the controller must have IP addresses that match the subnets of the network to which the devices are connected.
Understanding IP addressing and the subnet mask is key to creating separate subnets. The basic rule is that the sum of the IP address and the subnet mask define the subnets.
IPv4 addresses are grouped into 4 octets, where each octet represents a very large binary number. Depending on the subnet mask, you will need to change the appropriate octet to create the different subnets for your primary and secondary device networks.
For example, if the primary device network is 192.168.1.100 with a subnet mask of 255.255.255.0, you must change the third octet to create a different secondary subnet (192.168.2.101 with a subnet mask of 255.255.255.0).
Contact Emerson support for assistance in designing the device network IP addressing.