I have a project for monitoring and controlling a plant with 10 Ai, 5 Ao, 10 Di and 10 Do. I use modbus TCP and it works fine. Even I can store the signals in a msql every second, while the plcthread is 100ms.
Now, let's say that I want to expand this plant by adding new modbus-slaves.
If I'm not wrong there are at least two ways to do so. The first one is the "copy the selected tree" method. Basically consists in select the $PlantHier, click in the right-button and "copy selected tree-after/before". Same thing with the Modbus-TCP-Slave changing Ip address, and then connect signals and channels. The other way is to build components and add instances of this components in the plant.
At this point a couple of questions arises:
1.- How many new mosbus-slaves can be added, and wich are the limitations.
2.- If it is possible to add for example 200 modbus slaves, which method will be better, the instances or the "copy tree".
Thank you in advance.