Spectrum 1746SC-INI4i Analog Input Module

Spectrum 1746SC-INI4i Analog Input Module is Spectrum Controls’ four‑channel isolated analog input card designed for use in SLC 500 systems. It monitors up to four isolated analog current inputs with channel‑to‑channel isolation rated at up to 750 VDC, helping to eliminate the need for external isolation blocks and reduce wiring complexity in noisy industrial environments. Each channel supports a current input range (0/4–20 mA) and can be configured with its own input filtering, featuring four selectable filter frequencies per channel to tailor response to sensor dynamics. The module plugs into an AB 1746 I/O backplane and communicates measured values to the SLC 500 controller, enabling reliable data acquisition for applications such as flow meters, level sensors, and other loop‑powered devices. This combination of isolation, compact four‑channel I/O, and per‑channel filter options makes it suitable for process and factory automation where protecting the controller from transients and ground loops is critical while maintaining straightforward integration with existing AB backplanes.