Q6 Marks 5 CLO-2 PLO-2 The diagram below shows a batch mixer which is required to mix three products A, B and C in the specified ratio. a. Develop a scheme to perform this task using a PLC. b. Classify the field devices in the groups of digital Inputs, digital outputs, analog inputs and analog outputs to be incorporated in the scheme. c. Explain the purpose of using the shut-off valves in the diagram while in the presence of proportional flow control valves installed? Product A ON/OFF Valve ON/OFF Valve 0-10 VDC ---- Product B Differential Pressure Flow Meter (Orifice) -10 to +10 VDC Steam Differential Pressure Flow Meter (Orifice) -10 to +10 VDC Mixer DE 0-10 VDC Differential Pressure Flow Meter (Orifice) -10 to +10 VDC DON/OFF Valve I ON/OFF Valve Product C Water Product B= 40% Product A Product C-32% Product A