1791-16A0 Block I/O Input Module Overview
The Allen-Bradley 1791-16A0 is a compact, self-contained Block I/O module with 16 digital inputs. It is part of the 1791 series, engineered for distributed control systems. This module integrates power supply, PLC interface, and I/O in one unit. It accepts 120V AC inputs from field devices. The 1791-16A0 is ideal for retrofit or new automation projects.
Key Technical Specifications
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Part Number | 1791-16A0 |
| Product Line | 1791 Block I/O Series |
| Inputs / Groups | 16 inputs (2 groups of 8) |
| Nominal Voltage | 120V AC |
| On-state Voltage Range | 79–132V AC, 47–63 Hz |
| External Power | 85–132V AC, 150 mA |
| Off-state Voltage (max) | 35V AC |
| Input On-state Current | 5 mA @ 79V (min) |
| Off-state Current | 2.3 mA (min) |
| Output Rating | 600 mA @ 30°C / 300 mA @ 60°C |
| Surge Current | 10 A for 50 ms (repeatable) |
| Operating Temperature | 60°C (140°F) max |
| Mounting | Horizontal or Vertical |
| Weight | 1.25 lbs (0.57 kg) |
Installation & Clearance
- Mount horizontally or vertically with no derating.
- Maintain 2 inches (58.0 cm) clearance on all sides for airflow.
- Use daisy-chain wiring to connect to a network scanner.
- Inputs are asynchronously scanned by the controller.
Compatibility & Integration
- Works with 1771 series output modules (e.g., 1771-OAN, 1771-OD16, 1771-ODD, 1771-ODZ).
- Ensure off-state leakage < 2.3 mA for proper operation.
- Compatible with proximity, limit, selector, float, and pushbutton switches.
- Supports auxiliary contacts and other discrete devices.
Diagnostic & Environmental Features
- Built-in diagnostics for input status and power monitoring.
- Operates in harsh industrial environments (0–60°C).
- High noise immunity per Rockwell standards.
- LED indicators for each input channel.
Typical Applications
- PLC-based control systems in manufacturing.
- Discrete sensor interfacing in conveyor lines.
- Packaging machinery and material handling.
- Retrofit of legacy 120V AC I/O points.
FAQ – Quick Answers
- Q: What is the max output current?
A: 600 mA at 30°C, derate to 300 mA at 60°C. - Q: Can I use it with 24V DC sensors?
A: No, it is designed for 120V AC inputs only. - Q: Is surge protection included?
A: Yes, built-in surge capability (10A for 50ms). - Q: What is the mounting orientation?
A: Horizontal or vertical; no restrictions.
Order & Shipping Information
- Packaging: Module with terminal base, user manual.
- Warranty: 12 months against defects.
- Shipping: FedEx, UPS, or DHL (tracked).
- Certifications: UL, CSA, CE (as per Rockwell).
Why Buy From Oiltech Controls?
- Over 15 years in industrial automation spares.
- Global shipping with real-time tracking.
- Tested surplus/refurbished options available.
- 12-month warranty on all products.
- Technical verification before shipment.
- Support for obsolete and legacy systems.
Contact us: info@oiltechcontrols.com | +86 158 8020 0923 (WhatsApp)
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