- A closed loop controller is given by the graph below. The measured variable is read through analogue channel IW512 and the output to the reject valve is through analogue output QW412. The PLC reads the analogue input into MW10 every two (2)seconds, subtracts it from the setpoint, then multiplies the difference by the gain K=2.8 and sends the result to the valve through output analogue module QW412. Write a PLC program to carry out the above task using either Siemens or AB PLC. USe only one PLC)