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PLC is basically designed to operate in an industrial environment with wide range s of ambient temperature and humidity
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All the capabilities of the earlier systems
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Hardware and software of the PLC are designed for easy use by the plant technician and electricians.
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The dramatic performance increase over the relay logic systems
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Troubleshooting is simpler with PLC’s as they have been provided with fault indicators and written fault information displayed on the screen.
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Greater reliability
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Little maintenance due to no moving parts
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No special programming skills required by maintenance personnel
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The physical size of the PLC system is much smaller than the conventional relay-based logic
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Lower cost
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Ease of programming
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Ease of maintenance
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Designed for industrial environment
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Quick installation
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Adaptable to change
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PLC’s are not affected by electrical noise problems
Also read Low Cost PLC’s for beginners