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plc flags

1 article tagged “plc flags”.

Flat vector diagram of a PLC rack with internal bit memory cells highlighted in teal and grey showing how internal flags connect input and output logic rungs
internal bitsplc flagsladder logic

PLC Internal Bits: Flags, Coils and How to Use Them

Internal bits, flags and internal coils let your PLC logic communicate with itself across rungs. Learn what they are, how to use them correctly, and the gotchas that trap beginners.

Jul 29, 2026 · 9 min read

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