High-Density 16-Point AC Input Solution for Industrial Automation Systems
The Allen Bradley 1794-IB16 Flex I/O AC Digital Input Module is a robust and widely used high-density input module designed for FLEX I/O distributed control architectures. Despite its name in some listings, this module is a 24V DC digital input module (not AC input), engineered to reliably interface with field devices such as sensors, switches, and relay contacts in industrial automation environments.
Built for scalability and dependable performance, the 1794-IB16 is a core component in modular I/O systems where efficient signal acquisition, reduced wiring, and flexible system expansion are essential. Its compact design allows engineers to maximize I/O density while maintaining stable operation in demanding industrial conditions.
Technical Specifications & Physical Characteristics
| Specification Item | Details |
|---|
| Product Series | FLEX I/O |
| Module Type | Digital Input Module |
| Manufacturer | Allen Bradley |
| Model Number | 1794-IB16 |
| Input Channels | 16 DC sinking inputs |
| Input Voltage Range | 10–31.2V DC |
| Nominal Input Voltage | 24V DC |
| Input Current (typical) | ~8–12 mA per channel |
| OFF-State Voltage Max | ~5V DC |
| Input Impedance | ~4.6 kΩ |
| FlexBus Current | ~30 mA @ 5V DC |
| Power Dissipation | ~6.1 W max |
| Isolation Voltage | ~50V basic isolation |
| Response Time | Fast industrial switching (ms-level) |
| Status Indicators | 16 individual LED input status lights |
| Mounting Type | FLEX I/O Terminal Base (DIN rail system) |
| Compatible Bases | 1794-TB3, TB3S, TB3K, TBN series |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Vibration Resistance | 5g (10–500 Hz) |
| Shock Resistance | 30g |
| Dimensions | Approx. 94 x 94 x 69 mm |
| Weight | Approx. 0.25 kg |
Industrial Application Areas
The 1794-IB16 module is commonly used in distributed automation systems requiring high-density digital input monitoring with stable and scalable architecture.
Typical applications include:
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Factory automation and assembly lines
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Packaging and labeling machines
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Conveyor and material handling systems
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Automotive manufacturing systems
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Industrial machine control panels
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Process monitoring and control systems
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OEM equipment design
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Retrofit and system expansion projects
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Remote I/O distributed control cabinets
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High-density sensor signal acquisition
Key Features & Operational Advantages
High-Density 16-Channel Input Design
Provides efficient monitoring of 16 discrete DC input signals in a single compact module, reducing cabinet space and simplifying system architecture.
Reliable Industrial Signal Processing
Designed for stable detection of standard 24V DC field signals from industrial sensors and switching devices.
Clear Diagnostic Feedback
Each channel includes LED indicators for fast troubleshooting and real-time status visibility.
Flexible System Integration
Works seamlessly with FLEX I/O adapters such as EtherNet/IP, ControlNet, DeviceNet, PROFIBUS, and Remote I/O systems.
Modular Expansion Capability
Allows easy system scaling by combining with other FLEX I/O modules without redesigning the control system.
Industrial-Grade Durability
Engineered for continuous operation in harsh environments with resistance to vibration, electrical noise, and temperature variation.
Technical FAQs
1. What is the main function of the 1794-IB16 module?
It is a 16-point DC digital input module used to read discrete signals from industrial field devices.
2. Is the 1794-IB16 an AC input module?
No, despite some naming confusion, it is a 24V DC sinking digital input module.
3. How many input channels does it support?
It provides 16 digital input channels.
4. What is the input voltage range?
It operates within 10–31.2V DC, typically at 24V DC nominal.
5. What devices can it read?
It reads signals from sensors, switches, relays, and industrial contact outputs.
6. What system does it connect to?
It connects via FLEX I/O adapters such as EtherNet/IP, ControlNet, DeviceNet, and Remote I/O.
7. Does it require a terminal base?
Yes, it must be installed on a compatible FLEX I/O terminal base.
8. Is it suitable for modern automation systems?
Yes, it is still widely used in both modern distributed systems and legacy installations.
9. What is its power consumption?
It typically dissipates up to around 6.1 W depending on load conditions.
10. Is it suitable for industrial environments?
Yes, it is designed for reliable performance in standard industrial conditions.
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