Here are some considerations that should be taken into account when configuring a system:
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Power supply requirements
Supply voltage: 24 V DC or 100–240 V AC
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Input/Output requirements
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How many signals (external switch contacts, buttons and sensors) do you need to
input?
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What types of functions do you need to switch, and how many of them are there?
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How high are the loads that the outputs need to switch?
Choose relay outputs for switching high loads and transistor outputs for switching fast,
trigger-free switching operations.
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Special Function Modules
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Number of modules in system
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External power supply requirements
Selecting the Right Controller The Hardware
2-8 MITSUBISHI ELECTRIC