Panel PP845 and AC800M PLC communication optimization
Hello! I designed communication between PP845 and PM861 using Access Variables and MMS protocol over ControlNetwork. It's an easy way, but exchange or approx. 250 variables (including reals, words and structures) takes 2-3 seconds. That means 5 second operator response, that is too much.
Is it a way to speed up a communication?
Maybe it is possible to exchange only variables, that are in the current screen (siemens panels do it that way)? Or maybe PLC can dynamically manage data exchange? In the last case I can use a current screen number from panel and manage data exchange in user program.
Or I have to use another protocol for my purposes?
Any other ideas?
Thanks in advance!
Hi, a few tips you can find in Panel Builder programming and installation manual (i.e. page 24):
In addition to this answer, in the manual is written:
Only signals to objects in the current block are read continuously. This also includes signals for object dynamics. Signals to objects in other blocks are not read, thus the number of blocks does not affect the communication time.