Reliable 32‑channel digital DC output module 1746‑OB32 for SLC 500 systems
The 1746‑OB32 is a high‑density digital DC output module designed for the SLC 500 programmable controller series. It provides 32 sourcing outputs (24 V DC) organized in 2 groups of 16 points each. The module supports a voltage range of 5 to 50 V DC, draws 190 mA from the backplane, and delivers a maximum module current of 8 A. Each output can handle up to 0.25 A under normal conditions, with pulse surges of up to 1.0 A for brief durations. Status LEDs provide per-channel feedback, and the module offers electrical isolation for noise immunity.
Technical specifications
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Module type: Digital DC output (sourcing)
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Number of outputs: 32 (2 groups of 16)
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Nominal output voltage: 24 V DC
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Operating voltage range: 5 – 50 V DC
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Output current per point: 0.25 A (normal), surges to 1.0 A for 1 ms
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Maximum module output current: 8 A
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Backplane current (5 V): 190 mA
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Signal delay ON: 0.1 ms; OFF: 1.0 ms
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Off-state leakage current: ≤ 1 mA
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Maximum voltage drop ON: ~1.2 V @ 0.5 A
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Minimum load current: 1 mA
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Isolation: 1500 V AC between outputs and logic
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Operating temperature: 0 to 60 °C
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Shock: 30 g (operating)
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Vibration: 5 g (10–500 Hz)
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Mounting: fits SLC 500 chassis, removable terminal block
Key advantages
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High-density 32-output module saves chassis slots
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Flexible sourcing outputs compatible with various DC loads
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Compact and efficient design
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Clear LED indicators for each output channel
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Robust isolation and noise resilience
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Suitable for demanding industrial automation
Application and use cases of 1746‑OB32
This module is ideal in control systems where many discrete outputs (e.g. coils, relays, indicators) must be driven from a PLC. It is often used in manufacturing lines, material handling, packaging machines, and expanding digital output capacity in SLC 500 installations.
About the manufacturer
Allen‑Bradley, a Rockwell Automation brand, is highly regarded in industrial automation. The SLC 500 platform is well known for modularity and reliability, and the 1746‑OB32 module completes the digital output capability for flexible system design.