Answer / senthilkumar saudi aramco

AI- Analog input (that means 24volt dc with 4-20madcdriving
the loop)

AO- Analog Output (that means only 4-20 madc driving the
loop)
D/I - Digital input (5volt/15volt/24volt/110volt supply
given from plc to the field switches
(pressure,level,limit,flow)to close the circuit or breake
the circuit.
D/O - Digital Output (PLC giving output voltage mode
24volt/110 volt to the field either solenoid valve or
electrical driven equipments

Answer / 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 .

if we open the inlet of an air regulator ,how it will affect the out put of regulator? (out put of regulator is using to operate an on-off valve.it is an air to open valve,and valve is in open position.my doubt is air regulator will hold the valve in open or not,if there is no consumption or leak in regulator out put side ,we only loose the input pressure.)

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