Tag: s7commplus

Sep 16, 2026 · Engineering
Five Doors Into One Siemens Controller: What Each One Costs You
How you ask a Siemens PLC for data matters more than which protocol you use. Reading the same hundred values off the same controller, a client that groups its requests is a hundred times faster on Modbus and five to fifteen times faster on S7Comm. That is larger than any difference between the protocols themselves. A measured look at what protocol and driver choice costs a PLC, a network and your budget.
Jul 31, 2026 · Security
Three Doors into the Same Controller: How an S7 PLC Actually Talks
A modern S7-1500 or S7-1200 answers on three quite different doors, and they do not enforce access control the same way — or, in some cases, at all. A map of the native S7 channel, the OPC UA server and the web server beside it, and the fieldbus underneath.