Input and output size

DI senses an input (perhaps a proximity or micro switch).

DO can drive an Output (perhaps a solenoid valve via a solid state relay).

32 bit in reference to DI's or DO's is the number of inputs or outputs available on a particular module. (DI 32 bit means 32 Digital Inputs).
 
thank you sir,for your nice reply. When I was in training the chief engineer asked me this question and I answered as like you but he was not satisfied.
thanku again.:site::
 

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