The transmission time depends on many factors: PLC-CPU, program utilization, network, PC speed, etc. With a fast S7-1500 CPU and almost ideal conditions we were able to realize transmission times in the range of 1 ms. The S7-1200 used here for measurement is of course slower. There the pure transmission times are about 10 to 12 ms.
Especially when a lot of data has to be read or written, our software brings clear speed advantages. For example, if you use our Excel-PLC coupling to acquire machine data. This allows you to read a lot of data from the data blocks of one or more Siemens S7 CPUs in a short time.