HMI- Human Machine Interface


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HMI- Human Machine Interface

  1. 1. Human Machine Interface nfi
  2. 2. Modern Interface Earlier Time Monitoring
  3. 3. HMI functionality Human Machine Interface (HMI): Graphical object state presentation, lists, reports Operator Command handling change binary commands, set points Alarm & Events record specified changes and operator actions History data base keep a record of the process values and filter it Logging keep logs on the operation of the automation system Reporting generate incident reports
  4. 4. Operator workplace: three main functions current state alarms and events trends and history
  5. 5. What is an alarm, an event ? Alarm and Event (A&E) consider changes occurring in the plant (process) or in the control system that are worth recording (operator actions, configuration changes,…) Recorded changes can be of three kinds: - informative: no action required (e.g. "production terminated at 11:09") - warning: plant could stop or be damaged if no corrective action is taken "soon" (e.g. "toner low") - blocking: the controller took action to protect the plant and further operation is prevented until the reason is cleared (e.g. "paper jam")
  6. 6. What triggers an alarm ? - binary changes of process variables (individual bits), some variables being dedicated to alarms - reception of an analog variable that exceeds some threshold (upper limit, lower limit), the limits being defined in the operator workstation - reception of an alarm message (from a PLC that can generate such messages) - computations in the operator workstation (e.g. possible quality losses if current trend continues) - calendar actions (e.g. unit 233 did not get preventive maintenance for the last three months )
  7. 7. Trends Trends allow to follow the behaviour of the plant and to monitor possible excursions. Monitored process data (sampled or event-driven) are stored in the historical database.
  8. 8. Historian The historian keeps process relevant data at a lower granularity than the trend recorder, but with a larger quantity. Data from different sources is aggregated in one data base, normally using data compression to keep storage costs low. Data are analysed according to "calculation engines" to retrieve "metrics": - performance indicators - quality monitoring - analysis of situations (why did batch A worked better than batch B)
  9. 9. Internal Memory Internal Memory Internal Register (Read / Write) : $ Non-volatile Internal Register (R/W): $M
  10. 10. Elements of the operator workstation mimic alarms processing trend processing alarms logging state logging process data base simulation instructor desk actualisation process data plant
  11. 11. HMI Connections Communication Channel Rs 232/485/422 1 2 1 HMI 1-1IC1 2 PLC 1-1OC1 IN0 IN1 OUT1 IN2 OUT2 IN3 OUT3 IN4 OUT4 IN5 OUT5 IN6 OUT6 IN7 1 OUT0 OUT7 2 COM Power Supply COM
  12. 12. Communication Channels
  13. 13. 100+ Video Tutorials Coupon Code in $99 $49 Life time Access Course Outline Learn to Code | Code to Learn nfi Learn 4 PLC’s in a Day presents PLC – Programmable Logic Controller Delta DVP 14 SS + 16 SP • 100+ PLC Video Tutorials Allen Bradley M1000 • Doubt Clearing Complementary LIVE Sessions on Team Viewer Siemens S7 200 • Ladder Logic Programming Schneider • PLC Presentations, PLC Circuits, PLC Codes Analog Cards Programming • FREE PLC Simulation Software for Practice 04 AD – Analog to Digital 04DA- Digital to Analog For more courses visit
  14. 14. PLC & VFD Advanced Course 4 PLC’s Training Platforms $149 Course Link: Course Highlights: • 30 Live Practical Classes on PLC, Analog Cards & AC drives- VFD • 100+ PLC Video Tutorials with Lifetime Access & FREE PLC Simulator • FREE Circuits Diagram For more courses visit
  15. 15. Thanks nfi