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  In a certain area of our facility we have several machine that manufacture a handful of products. These machines were built at random intervals starting in the late 80's and consequently have a range of different PLCs that are used to control them (SLC 500 to ControlLogix L61).   The other areas of our facility use a server that has a historian installed (Canary) and the client (Axiom) is installed on our computer so we can view data trends in real time.    I would like to network our PLCs mentioned in the first paragraph to this historian to gather production and maintenance data.   I know that I need to network these devices through an OPC server (which we have).   Several of these devices have been connected through DH+ and/or Ethernet networks in the past but are no longer connected.   We recently connected some of the DH+ Devices to the Ethernet network (just to see if we could) with a Prosoft AN-X2-AB-DHRIO.   My questions are:   Are there any best practices for networking devices with different protocols, i.e. DH+, Ethernet, etc.? Is the way we have it set up now (with the Prosoft DH+ to Ethernet bridge) a robust (scalable, etc.) solution? Is there a better way to do this? Is it worth getting EtherNet/IP cards for the PLCs that don't have them?   If anyone has any experience with a similar scenario, insights/advice would be much appreciated