The Allen-Bradley 1336-L4 is a Control Interface Option Board that enables TTL contact closure functionality for Allen-Bradley PLC systems.

TTL stands for Transistor-Transistor Logic, a common voltage level standard used in digital circuits. Contact closure refers to the opening or closing of a physical switch or relay contact, which can be used to signal events or control processes.

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Some second-hand products may have obvious scratches on the surface.
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