Hi I have the same warning. There is a typo in TS7Worker::SZLSystemState(): --- a/src/core/s7_server.cpp +++ b/src/core/s7_server.cpp @@ -1244,7 +1244,7 @@ void TS7Worker::SZLSystemState() { SZL.Answer.Header.DataLen=SwapWord(sizeof(SZLSysState)); SZL.ResParams->Err =0x0000; - memcpy(SZL.ResData,&SZLNotAvail,sizeof(SZLSysState)); + memcpy(SZL.ResData,&SZLSysState,sizeof(SZLSysState)); isoSendBuffer(&SZL.Answer,28); SZL.SZLDone=true; }