The Relays are Responders, the PLM is the Controller. The PLM requires a Controller link with the address of the EZIOxx, the EZIOxx requires a Responder link with the address of the PLM. One pair of link records for each Relay.
In the Responder link in the EZIOxx for Relay 1 the LD1/2/3 data is 00 00 00.
In the Responder link in the EZIOxx for Relay 2 the LD1/2/3 data is 00 00 01.
There is no need to create links in the other direction as the Relays do not function as Controllers.
The EZIOxx Relays can also be controlled directly without using Groups (links). The Insteon Direct commands to turn the Relays On/Off are described in the EZIOxx Advanced Programming Details document available in the Downloads section of the web site.
Output ON – 0x45
Output OFF – 0x46