[1] BOILER AUTOMATION USING PLC P. K. Bhowmik, and S. K. Dhar 2012 7th International Conference on Electrical and Computer Engineering 20-22 December, 2012, Dhaka, Bangladesh

[2] “Programmable Controllers: Operation and Application, “Prentice-Hall, Englewood Cliffs, NJ, 1988.

[3] P. K. S. Khan, A. A. Noman and R. K. Dey, “PLC Based Operation of Three Natural Gas Generator Models- A Leering Aid for Undergraduate Students” Third International Conference on Power Systems, Kharagpur, INDIA December 27-29, 2009.

[4] MicroLogix 1762-IF2OF2 Analog Input/Output Module Wikipedia.

[5] Relay logic Wikipedia, the free encyclopedia

[6]SCADA clark science center