Answer / surendra singh tanwar

I/O are required to convert the process value or status in
to a formet which can be communicated to the controller and
v/v controller to processe

Answer / delta_v

Remember that from field instruments the signal sent are only process data (example temperature, pressure); these data can't be read by the controller, hence it will become useless.
That is why IO cards are used to convert these to a readable signal which is 4-20mA.




"You cannot measure, what you cannot control"

Answer / makinde motunrayo

why we don't use I/O directly with controller.
The controller here is PLC, I/O is not use directly because of space the back-plane will occupy . i.e Organisation of instruments from field to the controller.

Why DP transmitters are subjected to high static pressure test of 100 bar. Though they will be used for very small pressure range

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