Advantages:
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Small physical size & shorter project time.
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Cost effective for controlling complex system.
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Reliability.
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Less and simple wiring.
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Faster response.
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Remote control capability.
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More flexibility.
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Ease of maintenance / troubleshooting.
Disadvantages:
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Fixed circuit operation.
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PLCs manufacturers offer only closed loop architecture.
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PLCs are propitiatory, which means software and parts one manufacturer can’t be easily used in combination with part of another manufacturer.
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Number of optional modules must be added to maximize flexibility and performance.