Answer Happy

c) The above control system is to perform as part of a SCADA system. The controller to be implemented in a control office which is remote from the actual plant. The plant itself uses a local Bus architecture for connection to the sensors and actuators. i) Sketch a structure that could achieve the above and clearly identify any equipment needed. Name two advantages of using a Bus architecture. Collision avoidance is required and is implemented using CSMA/CD (Collision Sense Multiple Access/Collision Detection). Briefly explain how this works. ii) iii) (4 Marks) (2 Marks) (2 Marks) Total: 20 marks

Question 1 Figure Q1 shows the structure of a closed loop control system: d(s) e(s) u(s) sp(s)- K(s) ++ G(s) →y(s) Figure Q1