Reference no: EM133274296

Programmable Logic Controller

Learning outcome 1: Evaluate the scope, context, and significance of the programmable logic controls design and operational characteristics

Learning outcome 2: Apply the key aspect of the operating principles of PLC communication and programming techniques

Learning outcome 3: Provide an overview of applications of PLC in the industry.

Assignment Task.

Question 1. What problems arise if the analog input signal comes to the PLC in a non-standard format? Explain how you can solve this problem using scaling.

Question 2. What is a control system's most important tool(s) to identify a fault? List three such tools and ciscuss their operations.

Question 3. What is the dead time in the controller, and how is the controller design affected by dead time? Which control techniques are more suitable for processes with large dead-time?

Question 4. Design a Motor Control Centre (MCC) and apply the following to address the design requirement above using EKTS.
- Alarm and interlocking mechanisms.
- Basic constraints in process control and overriding procedures
- Emergency shutdown and power failure restarting and recovery functions
- CC and CCW rotation of a three-phase motor using a pushbutton.
- Five-second delay of the motor operation in case of power recovery.

Question 5. Freshwater suitable for human drinking is usually scarce, and global warming exaggerates this situation. You are working in Global Green, a company that has the mission to use green energy to develop sustainable systems. You have been tasked to design a PLC that controls the processing of the seawater system to freshwater. The system in Figure 1 consists of the main tanks, motorized valves (M1 and M2), level sensors, and a heating element. The following design requirements are needed to be satisfied:
i. The water level in the tanks needs to be between 8-10 meters.
ii. When the water level is within the limit, the green lamp must be activated to indicate the right level of operation.
iii. The actuators (Valve Ml, M2, and Heating Elements) will be automatically activated to fill the tanks to the required water level.
iv. If the water tap is used and the L3 sensor's lowest limit is triggered, the Heating element should start.
v. If L2 is lower than its lowest limit setting, the M2 valve will be activated to supply water. The same applied to the L1 sensor that will activate M1.
vi. The heating element should not operate more than three times within 20 minutes not to drain the power source.

Using Ladder PLC programming, implement the required solution using Logo!SOFT Comfort software.