DDE/OPC communication event errors

:6Ah error in the DDE/OPC Communications Event Log

A DDE/OPC Client has caused an exception to occur in the DDE/OPC subsystem

CIP IOI Syntax Error, tag may not exist

CIP Messaging Error: A message timed out waiting for a response

Connection dropped while trying to read a ControlLogix Optimized Packet

ControlLogix attempted to read a ControlLogix Optimized packet

ControlLogix connection 602191 got disconnected

ControlLogix Optimized packet being reinitialized

ControlLogix optimized packet response while in Initialized state

Could not find TOpt for ControlLogix Optimized packet

Data read for a ControlLogix Optimized packet with no data returned

Error adding a ControlLogix Optimized item

Error trying to add or remove ControlLogix Optimized items

Failed to establish communication with controller

This is an undefined topic. Verify the topic is in the current project

This item does not exist in the processor

What do I need to configure when creating a remote OPC connection?