![]() ![]() Snap7 library is designed keeping in mind large industrial time-critical data transfers involving networks with dozen of PLCs. What I think is important to highlight, is its advanced characteristics. You certainly have a clear idea about its use, its functions and their use are explained in detail into the Client API reference of the Snap7 Manual. It fulfills almost completely the S7 protocol, you can read/write the whole PLC memory (In/Out/DB/Merkers/Timers/Counters), perform block operations (upload/download), control the PLC (Run/Stop/Compress.), meet the security level (Set Password/Clear Password) and almost all functions that Simatic Manager or Tia Portal allows. The same OPC Server, despite to its name, is a client against the PLC. ![]() Into S7 world, LibNoDave, Prodave, SAPI-S7 (Simatic Net mn library) are clients. ![]() A PLC client is the most well-known object, almost all PLC communication drivers on the market are clients.
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