Allen-Bradley 1746-NI8 Analog Input Module SLC 500

The Allen-Bradley 1746-NI8 is an 8-channel analog input module for the SLC 500 PLC family that expands an automation system’s real-time sensing of process signals. This rack-mounted module connects to the SLC 500 backplane and is designed to accept analog voltage and current inputs (model dependent), enabling accurate measurement from sensors and transducers. Typical signals supported include 0–10 V and 4–20 mA, with a high‑resolution ADC delivering precise readings for temperature, pressure, and flow sensors. Installed in HVAC, water and wastewater treatment, batching and dosing, packaging machinery, and production lines, the 1746-NI8 helps upgrades, capacity expansion, or replacement of existing analog I/O in factory control architectures. It is compatible with Allen-Bradley SLC 500 controllers and operates in standard industrial temperatures from 0°C to 55°C. Common replacements listed for this module include the 1746-NI4 and the 1769-IF8, reflecting its role within the broader SLC 500 I/O ecosystem.