Methodology:

1. Getting to know the system Briefing by lab supervisor on the system 2. Getting started Start by switching ON the system Start the T-Soft Program 3. My Ladder Diagram Activate the I/O Identify the addresses for the digital input, digital output, analog input and analog output Start ladder diagram with a simple setup Run the program provided and experience the result Explore by modifying the program and experience the result 4. My HMI Start the Twin Soft Develop a simple HMI shown by the Lab Supervisor Explore by modifying the program or develop a new HMI and experience the result 5. Demonstration Program Use the program provided Identify the parameters for sensing and controlling Discuss the application 6. Task: Problem Solving Write a ladder diagram to switch ON the fan when the temperature is more than 27oC, ON the light when the temperature is more than 30oC and ON the buzzer if the temperature is more than 33oC. Compile and test the program. Develop an HMI using TView.

Results:

Figure 1

Figure 1 shows the ladder diagram and HMI display for the task given by the lab supervisor. This figure shows the condition before the program is executed.

Figure 2Figure 2 shows the condition when the program is executed. When the start button is pressed, m1 will energize. The HMI Display indicated that none of the output is activated during this period. This is due to the temperature of the thermocouple did not reach the set point as per ladder diagram yet.

Figure 3 When the thermocouple detect a temperature at 27 C, the comparator will detect the changes and activated the fan. From the HMI Display, we can see that the fan indicator changed from red to green to informed user the activation of fan as shown in Figure 3. On the other hand, output for lamp and buzzer is still OFF.

Figure 4The figure 4 shows the condition when thermocouple detected temperature above 30 C. In this state, the fan still activated due to previous condition but the lamp also turn ON. This is due to the set point at the comparator. The HMI Display indicates that the indicator for fan and lamp light turn into green which mean both of the output are ON.

Figure 5As shown in figure 5, all of the output is activated. The buzzer is ON due to thermocouple senses a temperature above 33 C. The HMI Displays indicates that the fan, lamp and buzzer indicator turns into green.

Figure 6In figure 6 above shows the condition then the emergency switch is activated. All the output is automatically OFF due to the deactivation of M1. This part is important in industry when unwanted or unusual situation occurs. By pressing the emergency button, it will turn OFF all the output for the safety purpose. From the HMI Display, we can see that all the indicator turns red to indicate that the deactivation of the outputs.

Discussion:SCADA stands for Supervisory Control and Data Acquisition. As the name indicates, it is not a full control system, but rather focuses on the supervisory level. As such, it is a purely software package that is positioned on top of hardware to which it is interfaced, in general via Programmable Logic Controllers (PLCs), or other commercial hardware modules. SCADA consists of Remote Telemetry Unit (RTU), Human Machine Interface (HMI) and communication. The first step of this lab experiment is done by declare the MS-PS230V, MS-COMBO-1, MS-A0VC and MS-GSM. In the MS COMBO-1, digital input, digital output, analog input as well as analog output is addressed. LAN Cable was used to connect the T-Box Training Kit with the computer. The procedure to complete the task given by the lab supervisor consist of 7 steps which are rename the input and output, declare the input and output, activate the output, communicate between hardware and software, designing the appropriate ladder diagram, send to panel hardware and software and the last step is transfer the program to HMI using TView. This task require us to design a program whereby when the thermocouple detect a temperature above 27 C, the exhaust fan will turn ON. The second condition is when the temperature reaches 30 C, the lamp indicator will also turn ON together with the exhaust fan. The last condition is when the thermocouple detect a temperature above 33 C, the buzzer will activated as well as the fan and the lamp will remain ON.For the safety purpose, the emergency switch it added to this program. The emergency button is very important in other to avoid something bad happen that leads to the failure of the system. It is function as when the button is pressed, it will turn off all the output and shutdown the system. After completing the ladder u diagram, we need to design a Human Machine Interface (HMI) Display by using Twin Soft Program. The function of HMI is as the apparatus or device which presents process data to a human operator. By using HMI, user can easily control and monitor the whole process of the system.

Conclusion:From this lab experiment, it can be concluded that the objectives of this experiment had successfully been achieved. After completing this lab, I was able to explain typical SCADA system (T-Box), write a simple program using ladder diagram via Twin-Soft, run simple control system using T-Box system, write and run simple Human Machine Interface (HMI) using TView and conduct troubleshooting on the system.This lab became very helpful for student since SCADA has been used widely in the industry. It helps student to understand the concept of SCADA and understand the connection between remote telemetry unit and the SCADA System itself. SCADA is a type of industrial control system (ICS), Industrial control system are computer controlled systems that monitor and control industrial processes that exist in the physical world. SCADA system historically distinguish themselves from other ICS systems by being large scale processes that can include multiple sites, and large distances. Through this experiment, students be able to get the opportunity to handle the sytem and monitor the flow of the system. it was a great experience on handling the SCADA system. In the future, I can use the knowledge when enters the working environment.

References:1. Practical SCADA for Industry By David Bailey, Edwin Wright2. Process Control Instrumentation Technology by Curtis D. Johnson3. http://www.iconics.com/Home/Solutions/SCADA.aspx#.VRmOOPmUeSo