The PLC extension is attached to images that represent the top silkscreen of an electronic board, most likely processed via Eagle software. PLC is part of the Gerber group of extensions, which functions as a de facto standard for storing images in the printed circuit board (PCB) industry. Other extensions included in this group are STC, STS and PLS. Each format contains data on a different segment or detail of an electronic board, including solder masks, copper layers etc.
The quick and simple way to handle your files is to get a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch conversions. As you will soon realize, reaConverter will help you avoid spending countless hours trying to figure out how to convert multiple PLC files as once.
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Advanced users can convert PLC files via command-line interface in manual or automated mode. You are welcome to contact our technical support when you have any questions about reaConverter.