Chuvanich, Suvalee. “A Low-Cost Automatic Tester of PLC Functions”. Journal of Advanced Research in Applied Sciences and Engineering Technology 51, no. 1 (September 4, 2024): 52–69. Accessed September 27, 2024. https://semarakilmu.com.my/journals/index.php/applied_sciences_eng_tech/article/view/10547.