Sending Explicit Message to PLC

[bruno.p...@gmail.com]

Hi every one! I know that OpENer was designed to work like a kind of slave but I would like to know if it is possible to send an explicit message to PLC from an independent thread (without initiative from the PLC side, like a request).

[rrich...@gmail.com]

Hi Bruno-

I don't have an answer here but have been wondering about the exact same question you have posted.  I have OpENer running on a CentOS 7 box communicating with an Allen-Bradley CompactLogix PLC. The Opener application opens connections for explicit messages coming from the PLC which with minor mods are being received fine.  I would like to get an explicit message from the CentOS box to the PLC but so far have not been able to do so.  I want to know - and I guess you want to know the same thing - is it possible to get OpENer to send a Forward Open, etc. to another system?  Like you, I realize only now that OpENer acts mostly as a slave, i.e. a server.  Any help would be appreciated.  Thanks -Ross Murphy

[Martin Melik-Merkumians]

Hi

this question has been asked several times, the answer is OpENer is a pure Adapter device. So no capabilities beside answering to requests is implemented. If you want to send request you can construct messages with the help of the endianconv, but no further support is implemented for this kind of operation.

Best regards,

Martin

[Bill McCormick]

You might try https://github.com/ros-drivers/odva_ethernetip, ignoring al the ROS stuff. And you'd need to right your app specific classes for I/O assemblies. You could look at some my Tolomatic examples for how to do this.

[bruno.p...@gmail.com]

Thanks!

[bruno.p...@gmail.com]

Thanks!