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Answer Posted / raja
AI - analog input
AO - analog output
DI -digital ""
DO- digital ""
these are the input and output types used in external cards
inserted in a plc . this ensures a proper selection and
processing of signals by PLC .
Important point is that they may not be the direct output of
a field sensor but a modulated one .
e.g - thermistor is provided in a plc itself for temperature
measurement . then it will be connected in analog input card.
2. pressure control to a p to i converter will be connected
in analog output card .
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