APP_S7 is an S7 PLC driver written by Alan Phillips that works with Siemens PLC's and with Ethernet connections. This means that the PLC must have a Profinet CPU or a profinet/ethernet external card (CP-343 etc). APP_S7 is written entirely in C# and aims to be the most flexible S7 PLC communication method....

APP S7 is a pure C# implementation of the S7 Protocol. APP S7 is deployed as a single source file that contains some classes that you can use directly in your .NET project to communicate with S7 PLCs. It’s designed to work with small hardware .NET-based or even for large projects which don’t needs of extended control functions...