Qt for plc
Qt for plc communication
Hi i'm Mark and i'm writing from italy.
Usually i use visual studio to create desktop application that communicate with plc siemens, read and write data to them and set event in my gui by data from plc.
But i ma fascinated from qt. I've need to know if with qt and c++ is possibile to do the same, ora is better to use wpf.
Hi and welcome to devnet,
How are you communicating currently with your PLC ?
S7 offers a C API (https://cache.industry.siemens.com/dl/files/203/13649203/att_38732/v1/mn_s7api_e.pdf) you can use that to communicate with the PLC
I am exactly doing what you wanto to do. Qt doesn't have any possibility for the communication to PLC, by nature. However I communicate with PLC using SNAP7 library. This library is only for Siemens S7 PLCs, and it is really great and you can find pre-compilerd binaries as well, if you don't want to compile yourself. I downloaded and compiled source code and am using this library for reading and writing variables in PLC. You can easily integrate it in your Qt application.
SNAP7 source: http://snap7.sourceforge.net/