Posted 7 Jun 2017 I need to know what port or port range that's used when programming a 1500 CPU. We need to update the settings of the CPU, and the customer can open up a router with "port forward" if I tell him what port to use. Does anyone here have the knowledge about what port or ports that are used for the 1200 and the 1500 systems ? Share this post Link to post Share on other sites
Posted 7 Jun 2017 I got an answer from a support guy. All Siemens CPU uses port 102 for S7 communication. Share this post Link to post Share on other sites