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1-Programming the PLC is easier than wiring realy control panel
2-PLC can be reprogrammed whereas conventional control panels must be rewired
3-PLC take less floor space than relay circuit for achiving the same function
4-reliability is greater than conventional control circuit
5-PLC can be connected to PC more easily
6-PLC is more safe than classic control
7-PLC can perform a greater variety of control function than relay control
8-PLC system can expand in future and do many modification more easily
the limitations are :
1-PLC is more complicated than classic control
2-need special experience to work with
plc is used for controlling any industrial operation . plc has ability for doing any program . plc output has limited current
