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The Allen-Bradley 1771-IQ16 is a discrete input module from the 1771 PLC platform, designed for interfacing with electrical and mechanical devices such as switches and sensors. It features sixteen isolated input channels operating within a 10-32 VDC range, converting signals to digital form for programmable memory storage. The module supports mounting on 1771 chassis models such as 1771-AB and 1771-A4B, using a field wiring arm for ease of installation and maintenance. This module offers adjustable signal delay settings, making it suitable for varied industrial applications.