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+--- Thread: Siemens PXC controller and LM bacnet client for Visu (/showthread.php?tid=6324)
Siemens PXC controller and LM bacnet client for Visu - MuranyiD - 24.02.2026
Hi there,
I am looking for a tool to visualize Siemens PXC4/5/7 controllers with LM communicating the data points via Bacnet/IP.
If I understand correctly in this case I would need to use the bacnet client library of LM. I tried looking into the capabilities of the bacnet client and I have found older forum posts stating that it's limited in the number of data points it can handle and also lacks discovery features.
Would there be a viable solution to read and write a few hundreds of data points with the bacnet client of LM? If not, could you recommend any other solutions with LM?
Thank you for your answer in anticipation!
RE: Siemens PXC controller and LM bacnet client for Visu - Daniel - 24.02.2026
If you use direct connection mode
https://kb.logicmachine.net/libraries/bacnet-client/#read-using-direct-connection-mode
Then you can read all points by single resident script and write by using event based scripts. This is the most efficient way. For scaning and discovery use YABE it is the easiest. You may need to slow down the reading if you have too many points.
RE: Siemens PXC controller and LM bacnet client for Visu - MuranyiD - 24.02.2026
Hey Daniel,
Thank you for the quick answer!
Would I need to run the read script with a scheduler every X minutes so the values update on the LM side?
Also I would need to create an event based script for every bacnet object, so the bacnet client writes it to the controller when the user updates a value via the visualization?
RE: Siemens PXC controller and LM bacnet client for Visu - Daniel - 24.02.2026
Single resident script for reading and yes one event script per object for write.
RE: Siemens PXC controller and LM bacnet client for Visu - admin - 24.02.2026
Your devices should also support Modbus TCP. That can be an alternative to BACnet. LM supports both master mode via profiles and slave mode via scripts.
RE: Siemens PXC controller and LM bacnet client for Visu - MuranyiD - 24.02.2026
(24.02.2026, 13:37)admin Wrote: Your devices should also support Modbus TCP. That can be an alternative to BACnet. LM supports both master mode via profiles and slave mode via scripts.
Unfortunately these controllers can't act as modbus slave, only as master. Do I understand correctly, that slave mode would be needed on the controller side?
RE: Siemens PXC controller and LM bacnet client for Visu - admin - 24.02.2026
See this: https://kb.logicmachine.net/integration/modbus-rtu-tcp-slave/