QY20‑2HC is a two‑channel high‑speed pulse input counting module, applicable for ZQ600 series PLC IO expansion and QY20 series coupler IO expansion. It supports 5V differential and 24V single‑ended pulse signal types including AB‑phase, Pulse + Direction, CW/CCW. IP20 protection grade, DIN‑rail backplane bus installation, compact size for cabinet automation control.
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