I am a professional Electronics Engineer, I have a good experience in PLC programming (LAD, STA & FBD) and already keep in touch with the schneider, Siemens, Delta and Fatague PLC's. I can writer a programmer for you and can also provides you the tips on how to protect your written programme in PLC. Furthermore, I am expert in RS-232, RS-485 and Profi-Bus Communication Protocol.