The Allen-Bradley 1746-IG16 SLC 500 Current Sourcing TTL Input Module uses Transistor-Transistor Logic, and is a chassis-located module. The module is compatible with the SLC 500 controller platform, and its voltage signal typically arrives from interfacing ports of electronic devices. When installing, it is important to handle the module via the ends of the unit, rather than the metallic surface, preventing damage from electrostatic discharge. The module is single-slot wide, and can fit into any slot except the processor's slot 0.
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