a) Identify five (5) non-value-added activities in a manufacturing system and briefly explain how each can be prevented or reduced [10 marks] I b) Design and construct the ladder logic diagram for the control system describe below. A control system is to be designed for a certain automatic machine used in the baking industry using a Siemen programmable logic controller device. The machine should start from either location A or B at the beginning of the day The machine should run for 90 minutes and then automatically stop. In addition, there are two (2) stop stations (S1 and S2) located at different locations around the machine any one of which can be pressed to immediately turn off the machine in the case of shut down. There is also a RF light curtain for safety, If any one interrupt the light path when the machine is running, the machine will automatically shut down and has to be reset before the machine can start again. The machine should run 25 cycles before requiring inspection for service. A service warning indicator lamp will flash when the maximum value is reached and cannot be restarted until the service reset switch is activated