Allen‑Bradley 1746‑IB32 – 32‑channel digital input module for SLC 500
The Allen‑Bradley 1746‑IB32 is a 32-point digital input module designed for use with the SLC 500 programmable logic controller platform. It supports 32 sinking (current-sinking) DC inputs, operating at 24 V DC, and is ideal for high-density signal acquisition in compact control cabinets. The module is built for industrial environments, offering reliable input signal detection, noise immunity, and fast response times.
Technical specifications
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Module type: Digital input (sinking)
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Number of inputs: 32
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Nominal input voltage: 24 V DC
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Input voltage range: 15–30 V DC (at 50 °C), 15–26.4 V DC (at 60 °C)
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Input current (typical): ~5.1 mA per point
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Off-state leakage: <1.5 mA
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Input delay time: 3 ms (OFF to ON)
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Backplane current draw: 0.05 A @ 5 V DC
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Power dissipation: ~6.65 W
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Isolation: 1500 V AC (input to backplane)
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Shock rating: 30 g
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Vibration resistance: 5 g, 10–500 Hz
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Operating temperature: 0–60 °C
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Mounting: DIN rail, SLC 500 chassis
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Dimensions (HxWxD): approx. 145 × 35 × 120 mm
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Weight: approx. 300 g
Key advantages
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High-density 32-point input module
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Saves panel space and reduces cost per input
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Designed for SLC 500 architecture
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Wide input voltage tolerance and robust filtering
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Removable terminal block for easy wiring and maintenance
Application and use cases of 1746‑IB32
The 1746‑IB32 is ideal for monitoring multiple discrete sensors, switches, and contact inputs in industrial automation systems. Typical applications include machine control panels, assembly lines, packaging systems, and distributed control solutions using Allen-Bradley SLC 500 PLCs.
About the manufacturer
Allen‑Bradley (a Rockwell Automation brand) is a global leader in industrial control systems. Their SLC 500 series is a proven, modular automation platform widely used in various industries for reliable and scalable control.