Hi there! Firstly, if you are using Codesys, using an OPC UA connection - here’s a great post on how to expose your Codesys tags over OPC - Codesys Tags into Groov View. I suppose if you needed another way to get data out of Codesys, you could expose tags via Modbus or another Industrial Protocol using Codesys various modules for communication.
If you are using PAC Control on your EPIC, you can check out the Cirrus Link Opto 22 groov EPIC SNAP PAC Driver from Ignition.
Another option would be to use the MQTT client on EPIC (either the native one or MQTT Transmission in Ignition Edge) to pump that data into the Ignition MQTT Distributor module.
Does that all make sense?