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What is the correct way to pluralize an acronym?

Let's say we're talking about PLCs (programmable logic controllers)? Or are they "PLC's"? I've seen it both ways!

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marked as duplicate by Mehper C. Palavuzlar, Colin Fine, JSBձոգչ, Mr. Shiny and New 安宇, aedia λ Oct 11 '11 at 13:01

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

Either way is acceptable - it's a style issue. And by the way, your example isn't an acronym, it's an initialism or abbreviation. Acronyms are read out as words, like NASA, but not PLC or CIA.

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