PLC:
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Operates in industrial enviroment
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PLC is programmed in relay ladder logic
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Has no keyboard, CD drive, monitor, or disk drive
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Has communication ports and terminals for input and output devices
PC:
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Capable of executing several programs simultaneously, in any order.
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Some manufacturer have software and interface card available so that a PC can do the work of a PLC.
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Speedy information processing
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Easy customization
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Straightforward data exchange with other systems