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Unformatted text preview: ﻲ ﺘﺸﻴﺭ ﺇﻟﻴﻬﺎ ﺘﻠﻙ ﺍﻻﺨﺘﺼﺎﺭﺍﺕ ﻭﻫﻨﺎ ﻭ ﻟﺘﺒﺴﻴﻁ ﻤﻔﻬﻭﻡ ﻨﻅﺎﻡ‬ ‫‪ SCADA‬ﻭﻜﻴﻔﻴﺔ ﻨﺸﻭﺀﻩ ﻓﺈﻨﻨﺎ ﺴﻭﻑ ﻨﺘﺩﺭﺝ ﺒﻁﺭﺡ ﺍﻷﻤﺜﻠﺔ ﻋﱠﻬﺎ ﺘﻜﻭﻥ ﻤﺭﻴﺤﺔ ﻓﻲ ﻓﻬﻡ ﻫﺫﺍ ﺍﻟﻨﻅﺎﻡ .‬ ‫ﻠ‬ ‫ﻟﻨﻔﺘﺭﺽ ﺃﻥ ﻟﺩﻴﻨﺎ ﺩﺍﺭﺓ ﻜﻬﺭﺒﺎﺌﻴﺔ ﺒﺴﻴﻁﺔ ﺘﺘﺄﻟﻑ ﻤﻥ ﻤﻔﺘﺎﺡ ﻭﻤﺼﺒﺎﺡ ﻜﻤﺎ ﻓﻲ ﺍﻟﺸﻜل ﺍﻟﺘﺎﻟﻲ:‬ ‫ﻫﺫﻩ ﺍﻟﺩﺍﺭﺓ ﺍﻟﺒﺴﻴﻁﺔ ﺘﺘﻴﺢ ﻟﻠﻌﺎﻤل ﻤﺭﺍﻗﺒﺔ ﺤﺎﻟﺔ ﺍﻟﻤﻔﺘﺎﺡ ﻓﻴﻌﻠﻡ ﻤﻥ‬ ‫ﺨﻼﻟﻬﺎ ﻓﻴﻤﺎ ﺇﺫﺍ ﻜﺎﻥ ﺍﻟﻤﻔﺘﺎﺡ ﻓﻲ ﺤﺎﻟﺔ‪ off‬ﺃﻭ ‪ on‬ﻭﺫﻟﻙ ﺍﻋﺘﻤﺎﺩﺍ‬ ‫ﹰ‬ ‫ﻋﻠﻰ ﺤﺎﻟﺔ ﺍﻟﻤﺼﺒﺎﺡ . ﻭﻓﻲ ﻤﺜﺎل ﺁﺨﺭ ﺇﺫﺍ ﻜﺎﻥ ﺍﻟﻤﺼﺒﺎﺡ ﻤﺭﺘﺒﻁ‬ ‫ﻤﻊ ﺩﺍﺭﺓ ﺘﻐﺫﻴﺔ ﻤﺤﺭﻙ ﻓﺈﻥ ﺍﻟﻤﺼ...
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