Draw the block diagram for PLC power supply and explain the function of each block.
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PLC power supply generates the required dc voltage levels for operation of the internal circuit of PLC. It is a switched mode power supply which accepts wide range of AC/ DC input voltages. Parts of PLC Power supply are: 

1) Line conditioner: Line conditioner unit filters the input AC voltage and removes any glitches,noise, EMI 

2) Converter: Converter unit converts AC into DC This is basically a switched mode power supply. 

3) Regulator: Regulator unit generates the required voltage levels for the PLC internal circuit Battery Backup: for reliable operation of PLC, there is a battery backup. In the event of power failure from AC input, Battery backup becomes active and prevents accidental shut down of PLC

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