1746sc-IM8I

The Allen Bradley 1746sc-IM8I is an isolated circuit discrete input module designed for use within the SLC 500 series. It features a total of 8 inputs capable of sourcing or sinking, providing flexibility for a variety of applications. This device operates efficiently over an alternating current range of 160 to 240 VAC and supports direct current inputs from 170 to 265 VDC, catering to diverse electrical setups.

Frequency specifications allow for operation within a minimum of 47 Hz up to a maximum of 63 Hz, ensuring compatibility with various exigencies in power systems. Each input shares individual isolation, with a point allocation of 1 per common—this allows for minimized interference among inputs, enhancing overall system stability.

In operation, a nominal input current draw is noted at 13.5 mA for connections at 240 VAC, while nominal current reduces to 2.5 mA when wired for 250 VDC. The design also allows for managing inrush currents, rated at 0.7 A at 240 VAC, which is vital for immediate operational readiness during startup conditions.

Signal response times include an off-to-on delay of 15 milliseconds at 240 VAC and 7 milliseconds at 250 VDC, with a slightly longer on-to-off delay recorded at 40 milliseconds for 240 VAC inputs and 36 milliseconds for those using 250 VDC. Power dissipation levels during operation sit at 6.6 W when the module is powered at 240 VAC or DC, increasing to 8 W with 264 VAC or DC supply. The 1746sc-IM8I module stands as a reliable component for integrating isolated input systems within Allen Bradley's SLC framework.