The Allen‑Bradley 1756‑IB16 is a 16‑point digital input module for ControlLogix that reads 24 VDC discrete signals from sensors and switches in industrial automation. It mounts in a 1756 ControlLogix chassis with screw-terminal field wiring, supports sinking or sourcing inputs, and provides individual input LEDs plus transient suppression and short‑circuit protection (platform dependent). Key specs include 16 input points, 24 VDC input, ~2–5 mA per channel, and compatibility with the Allen‑Bradley ControlLogix PLC family, with industrial operating temperature range. Common replacements include the 1756‑IB32, 1734‑IB16, and Siemens 6ES7321‑1BL00‑0AA0.
