Mitsubishi Electric FX2N Beginners Manual page 22

Selecting the Right Controller
To choose the right controller for your application you need to answer the following questions:
b How many signals (external switch contacts, buttons and sensors) do you need to input?
b What types of functions do you need to switch, and how many of them are there?
b What power supply options are available?
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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Programmable Logic Controllers
MITSUBISHI ELECTRIC