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SCADA/MODBUS

SCADA/MODBUS. Tim Bennett CNT 4104 Computer Network Programming. What is SCADA?. SCADA stands for: Supervisory Control And Data Acquisition. What is Modbus ?. Modbus is a serial communications protocol

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SCADA/MODBUS

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  1. SCADA/MODBUS Tim Bennett CNT 4104 Computer Network Programming

  2. What is SCADA? • SCADA stands for: • Supervisory • Control • And • Data • Acquisition

  3. What is Modbus? • Modbus is a serial communications protocol • One application is to connect a remote terminal unit (RTU) and server unit in SCADA

  4. Problem • Many pieces of equipment could be located in places where hazardous conditions exist • There needs to be a way to monitor these pieces of equipment

  5. Problem • Oil refineries • Water treatment plants • Wastewater treatment plants

  6. Solution • SCADA server is located in a protected central monitoring location • From here, the equipment can be monitored safely

  7. Solution Images taken from: http://www.mediamob.co.kr/infoland/frmView.aspx?list=blog&id=228832&page=1

  8. Solution Images taken from: http://www.mediamob.co.kr/infoland/frmView.aspx?list=blog&id=228832&page=1

  9. Results • Installed at the beginning of the semester • Failed halfway through • Contacted company to diagnose / repair / replace

  10. Results • Sent unit off to be fixed • One and a half weeks later, unit arrives back • Nothing supposedly wrong with the unit, but trouble ticket says the NVRAM was cleared

  11. Results • Three days after unit is back and has been operating normally, unit malfunctions again • Contacted company, asked for troubleshooting steps / advice; didn’t work • What’s next?

  12. Conclusion • SCADA / Modbus is useful for the remote and distributed control of plant functions • This particular unit probably needs to be tested more thoroughly before deployment in a real-world setting

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