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In page Programmable logic controller:
"These are for small machines and systems with low or medium volume. They can execute PLC languages such as ladder logic, function block diagram and sequential function chart. They are similar to traditional PLCs, but their small size allows developers to design them into custom printed circuit boards like a microcontroller, without computer programming knowledge, but with a language that is easy to use, modify and maintain. Architecturally, they sit between the classic PLC or micro-PLC and microcontrollers.[citation needed]
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