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A batch blending process consists of a blending tank that mixes five liquid ingredients. The ingredients are designated as A, B, C, D, and E. Each ingredient is controlled by an ON/OFF solenoid valve. The following statement list could be used to control this process: Initial Condition: Drain valve OPEN, ready light ON, all liquid valves OFF, mixer OFF. STEP 1: (1 to 3 s) Press START switch STEP 2: (20 s) Drain valve CLOSED, ready light OFF, valve A ON, delay 20 s STEP 3: (40 s) Valve A OFF, valves C and D ON, mixer ON, delay 40 s STEP 4: (60 s) Valves C and D OFF, valves B and E ON, mixer remains ON, delay 60 s STEP 5: (20 s) Valves B and E OFF, mixer remains ON, delays 20 s. STEP 6: (120 s) Drain valve OPEN, mixer remains ON, delay 120 s. STEP 7: (2 s) Mixer OFF, ready light ON, all ingredient valves remain OFF. Return to initial condition (1) How many input devices in this control system? List all input devices. (2) How many output devices in this control system? List all output devices (3) Draw a process timing diagram from this statement list (with all input and output signals of the controller illustrated)

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