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PLC´s productividad-crédito-cary-cereza.blogspot.com_1 (Advantages,…
PLC´s 
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Easy programming and installation, high control speed, network compatibility, problem resolution, adequate revisions, high reliability.
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Advantages
Small and cheap, compared to relay-based systems.
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Programming Devices
Software en PC
Hand-held
PLC Sizes and applications
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Interface
Human machine interface (HMI)
Programmable automation controller (PAC).
Branch Ladder
They are used to create parallel paths of input condition instructions. This allows more than one combination of input conditions (OR Logic) to establish the logical continuity of a ladder diagram line
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LOGIC