Draw the block diagram of discrete input module & explain each block.

Draw the block diagram of discrete input module & explain each block.
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1 Answer

Answer :

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Power conversion: It consists of rectifier which converts the incoming AC signal to a pulsating dc level, which is passed through filter and other logic in order to deliver a clean and denounced dc signal. 

Threshold detector: 

It detects if monitoring signal has reached or exceeded a predetermined value. A valid ON sate will be between 80- 132V ac. The upper voltage limit for a valid OFF state is below 20V. The voltage between 20V and 80V is called undefined zone.

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Isolation: It is made up of an optical isolator which separate high voltage from CPU‟s low voltage control logic. 

Logic section: It passes the input signal to the module‟s input address LED and the CPU.

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