Jayatissa, N.W.K.2016-06-232016-06-232015Jayatissa, N.W.K. 2015. Lesson 15: Programmable Logic Controllers, In: Practical Manual for GCE A/L Biosystem Technology Teachers. Ministry of Education and University of Kelaniya, Sri Lanka. 95-104 pp.978-955-4563-50-6http://repository.kln.ac.lk/handle/123456789/13655enLearning Object