1791-24B8 Block I/O Module – 24 Inputs / 8 Outputs
Brand: Allen‑Bradley | Series: 1791 Block I/O | Type: DC‑powered I/O module
This block I/O module offers 24 input points and 8 output points in a compact housing. It operates on 10‑30V DC for both inputs and outputs. The design suits high‑density machine control with fast signal processing. Use it for sensor monitoring and actuator control in automated lines.
Technical Overview (Oiltech Controls Insight)
- Total I/O: 32 points (24 inputs / 8 outputs).
- Input ON‑state: 10‑30V DC, 11mA max @ 30V.
- Input OFF‑state: ≤5V DC, 1.5mA min.
- Input delay: 1ms ON, 5ms OFF (fast) / 18ms OFF (slow).
- Output rating: 0.5A (vertical) / 0.25A (horizontal) per point.
- Surge current: 3A for 50s, repeats every 2s.
- External power: 19.2‑30V DC, 300mA internal protection.
- Thermal dissipation: 58.1 BTU/hr max.
Mounting & Environmental Ratings
- Mounting: Vertical or horizontal; derate output current for horizontal.
- Temp range: 0…60 °C (32…140 °F).
- Humidity: 5‑95% non‑condensing.
- Dimensions: 176.5 x 68.8 x 98 mm (6.95 x 2.7 x 3.85 in).
- Weight: 1.02 kg (2.25 lbs).
Compatibility & Typical Applications
- Works with: PLC‑5, SLC 500, and Logix platforms via block I/O adapters.
- Ideal for: DC sensor arrays, solenoid banks, and indicator panels.
- Common use: Packaging, material handling, and assembly stations.
- Field wiring: Removable terminal blocks for quick replacement.
Diagnostics & Protection
- LED status indicators per point for fast troubleshooting.
- Internal short‑circuit and overcurrent protection on outputs.
- Input filtering (fast/slow) reduces noise false triggers.
- Thermal shutdown prevents damage under overload.
5 Professional FAQs (with Buying Guide Insight)
- Can I mix input and output voltages? Yes, both input and output share 10‑30V DC range. Use a common supply for simplicity.
- How do I choose between fast and slow input filters? Use fast (1ms/5ms) for high‑speed counting. Use slow (1ms/18ms) for switch debouncing.
- What is the real‑world output current limit? For vertical mounting, 0.5A per point. For horizontal, derate to 0.25A. Keep total below 4A per module.
- Can I replace this with a newer 1791‑24B8/C? Yes, hardware is pin‑compatible. Check firmware if using with Logix controllers.
- Is external power required for inputs? Yes, external 19.2‑30V DC supply powers the module and internal logic. Inputs source from the same supply.
Why Buy From Oiltech Controls?
- Decades of expertise – 15+ years in industrial automation spares.
- Worldwide shipping – fast delivery via FedEx, UPS, or DHL.
- Quality assured – each unit tested before shipment.
- 12‑month warranty – covers all functional defects.
- Legacy support – we keep obsolete systems running.
- Same‑day dispatch – order before 2 PM for 24‑28 hour shipping.
Contact Us: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
Copyright © 2026 Oiltech Controls Limited. https://www.oiltechcontrols.com/ All rights reserved.
Reviews
There are no reviews yet.