Distributed Control Systems - Agenda Activity Estimated Time 1. Agenda 5 2. Learning Objectives 3. Historical Background 10 4. DCS Operation 40 BREAK 5. MUX/DEMUX 20 6. Bumpless Transfer 30 7. DCS Advantages 8. Review Activity 9. Summary and Wrap-Up 10. Additional Activity 50 11. Lab Activity Slide 1 Instrumentation 2 – Session 11

Session 11 - Objectives Explain the purpose of a DCS. In general terms, describe the operation of a DCS. Explain the function of a multiplexer/demultiplexer. Explain advantages of a DCS over an analog control system. Explain advantages of a DCS over an analog control system: more precise faster cost more trending operation one location/space Given a DCS diagram, identify the major components. Slide 2 Instrumentation 2 – Session 11

History of Digital Control Slide 3 Instrumentation 2 – Session 11

Distributed Control Systems Slide 4 Instrumentation 2 – Session 11

Individual Node Slide 5 Instrumentation 2 – Session 11

MUX/DEMUX Functioning Slide 6 Instrumentation 2 – Session 11

Bumpless Transfer in a DCS BUMPY response if Bumpless switch Is NOT made by an Operator Response Time Analog Controller Response Time Digital Controller Slide 7 Instrumentation 2 – Session 11

DCS Advantages Precision and accuracy Speed Cost Data management Space efficiency Safety and Reliability Slide 8 Instrumentation 2 – Session 11

True - False True False The local computer for each node communicates with a host computer Slide 9 Instrumentation 2 – Session 11

True - False True False The local computers for each node communicate with a host computer Slide 10 Instrumentation 2 – Session 11

True - False True False DCS eliminates the loss of accuracy that results from A/D conversion Slide 11 Instrumentation 2 – Session 11

True - False True False DCS eliminates the loss of accuracy that results from A/D conversion Slide 12 Instrumentation 2 – Session 11

Match From the List Greater precision in process management Slide 13 Greater precision in process management Less interaction needed between instrumentation techs and operator Greater ability to handle data management Less expense for installation and maintenance A DCS is preferred over earlier analog based systems for all the following reasons except: Slide 13 Instrumentation 2 – Session 11

Match From the List Greater precision in process management Less interaction needed between instrumentation techs and operator Greater ability to handle data management Less expense for installation and maintenance A DCS is preferred over earlier analog based systems for all the following reasons except: Slide 14 Instrumentation 2 – Session 11

Match From the List demultiplexer plc smart transmitter multiplexer   Multiple signals from field instruments would be forwarded to a controller by a Slide 15 Instrumentation 2 – Session 11

Match From the List demultiplexer plc smart transmitter multiplexer   Multiple signals from field instruments would be forwarded to a controller by a Slide 16 Instrumentation 2 – Session 11

True - False True False Bumpless transfer from manual to automatic mode requires adjusting the setpoint of the controller to the actual reading and then switching the mode. Slide 17 Instrumentation 2 – Session 11

True - False True False Bumpless transfer from manual to automatic mode requires adjusting the setpoint of the controller to the actual reading and then switching the mode. Slide 18 Instrumentation 2 – Session 11