Question

1) A discrete logic controller for an oven operates as follows: If the oven ON switch is activated, the oven door is closed, and the temperature is below a desired value, the controller turns the heat ON. If the heater is on, or when the temperature is above the desired value, and the door is closed, the controller turns the fan ON. If the oven light switch is ON or the door is open, the controller turns the oven light ON. The oven has an oven door limit switch whose status is denoted by DLS, where DLS = 0 means the door is open and DLS = 1 means the door is closed. The oven also has a temperature limit switch whose status is denoted by TLS, where TLS 0 means the temperature is below the desired value and TLS 1 means the temperature is at or above the desired value. The status of the heater, fan, light, oven ON switch, and light switch is denoted by H, F, L, S, and LS, respectively Define the inputs, outputs, and state variables of the controller. Generate a single state diagram for the controller Generate a state diagram for each state variable of the controller Using the result in part (c), generate Boolean logic equations for the control action. a) b) c) d)

Answer 1

Inputs: - On switch light switch Door Inputs Output: - heater light fan state Variables: - X_1 & X_2 General signal state Diagram: - \r\n Diagram is draw as per given condition which is explain in . . .(1) , . . . (2) & There are three outputs H_ON, f - ON & L - ON Two state variables state diagram for each state variable of controller: - State Diagram for X1: - State Diagram for X2: - \r\n Here define X_1 define for Door open close x_2 define for Temperature for X_1: - x_1 = door open /Door close X_1 = 0 rightarrow Door close x_1 = 1 rightarrow Door open For x_: - X_2 = 0 rightarrow temp greaterthanorequalto desired - temp X_2 = 1 close rightarrow Temp < desired - temp door - open rightarrow DLS = 0 Door - close rightarrow DLS = 1 Temp greaterthanorequalto desired - temp rightarrow TLS = 1 Temp < desired - temp rightarrow TLS = 0