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08/05/2019
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Hi,
I have a situation where I need to gather data from a OPC DA server running on a windows 8 machine to an application running on a linux (Ubuntu 18.04) machine on the same network.
My understanding so far is that DCOM is incompatible with linux. We've had to run up an application called Cogent on the windows machine to gather data from the server, and also be a TCP server for the application on the linux machine to connect to. The app on linux is NiFi by the way.
Is the DCOM incompatibility still the case? Is it possible for an app on linux to gather data directly from the OPC DA server?
Thank you
05/30/2017
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While direct ports of DCOM to Linux do exist I don't have any information on current availability or reliability.
I recommend that you look at developing an OPC UA client on Linux and installing a OPC UA to COM DA gateway on the Windows machine.
Many vendors offer off-the-shelf OPC UA to COM DA gateways.
You can download a free linux OPC UA client here:
01/07/2020
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Currently using Cogent. too. I like it and I figured out how to backup links. 700,000 tags available. Cogent is like using a tool to port all DA to anywhere. OPCDA is so complicated and brings up security questions having to make changes to DCOM just to get it to work. Cogent support is very good at stepping you through the DCOM work.
However, with all of the updates to Windows it interferes with reliability of HMI and connections.
It is nice to run Ubuntu or other Linux systems, for Data Flow with Cyber secure Non-Routability.
The Opto22 Groov EPIC is awesome. You can use the Inductive Automation Ignition interface on Linux and HMI. The driver talks to most PLCs and does not require OPC DA. It is already package with OPC UA for Linux. It is a full function controller as well.
Downloaded the Ignition software for free, Like Cogent. They run for an hour or 2 so you can decide on purchase options.
Communications on steroids.
Currently testing the Ignition on a stand alone Linux Ubuntu 18.04 with good success.
The Linux Based systems are more industrial and more simple.
Opto22 also provides the software for Groov you can run independent.
No Windows PCs are required. For HMI Data Concentration SCADA etc. I am pleased.
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