Case Study - SCADA; Plastic Film Line s The instruments were housed in four enclosures, distributed about the plant (enclosure 1 = 21 instruments, enclosure 2 = 30, enclosure 3 = 30 & enclosure 4 = 27) and were linked by RS485 cables directly to a 4 port card installed in the PC. integrated control and monitoring systems go to paperless chart recorders go to paperless chart recorders go to instrumentation go to instrumentation go to instrumentation go to instrumentation go to instrumentation go to instrumentation go to instrumentation go to instrumentation