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- Allen Bradley
- 1794-IA16
- ControlNet Flex I/O Adapter Module
- USA
- 94 × 94 × 69 mm
- 0.11kg
- Xiamen, China
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1794-IA16 FLEX I/O AC Input Module – Detailed Technical Overview
1. Product Introduction
The 1794-IA16 is a 16-channel AC digital input module designed for distributed industrial automation systems. It is used in FLEX I/O architectures to receive and process AC voltage signals from field devices such as switches, relays, push buttons, and sensors.
This module is built for cabinet-based and distributed control applications where multiple input points are required in a compact modular format. It supports direct connection to field wiring through compatible terminal bases, enabling flexible system expansion.
The 1794-IA16 is widely used in industrial control systems that require reliable AC signal acquisition under harsh electrical and mechanical conditions.
It is designed for use in modular I/O stations where scalability, maintenance efficiency, and wiring flexibility are essential.
2. Product Features
- 16-channel AC digital input
- Non-isolated input structure
- Industrial 120V AC input compatibility
- LED status indicators for each channel
- DIN rail mounting support
- Compact modular design
- High electrical noise immunity
- Hot-swap compatible within FLEX I/O system
- Stable signal acquisition performance
- Designed for distributed control systems
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1794-IA16 |
| Product Type | AC digital input module |
| Series | FLEX I/O 1794 Series |
| Input Channels | 16 channels (non-isolated) |
| Nominal Input Voltage | 120V AC |
| Input Voltage Range | 74–132V AC |
| OFF-State Voltage | ≤ 20V AC |
| ON-State Current | 5.49–14.81 mA |
| Nominal Input Current | 12 mA @ 120V AC |
| FlexBus Current | 20 mA |
| Power Dissipation | 6.4 W max |
| Thermal Dissipation | 21.8 BTU/hr max |
| Indicator Lights | 16 channel LEDs |
| Mounting Type | DIN rail |
| Compatible Bases | FLEX I/O terminal bases |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Vibration Resistance | 5g (10–500 Hz) |
| Shock Resistance | 30g operating |
| Electrical Isolation | Basic insulation (field to system) |
| Dimensions | 94 × 94 × 69 mm |
| Weight | 0.11 kg |
4. Product Function Description
The 1794-IA16 functions as an interface between AC field devices and industrial control systems. It continuously monitors incoming AC signals and converts them into digital status data for the PLC or controller.
Each of the 16 channels independently detects AC voltage presence and sends status signals through the FLEX I/O backplane system.
The module does not perform control logic; instead, it provides accurate input status data for higher-level automation processing.
Its internal design ensures stable detection of AC signals even under fluctuating voltage conditions.
5. Product Applications
The 1794-IA16 is widely used in industrial automation environments requiring AC signal monitoring.
Typical Application Areas
- Industrial machine control panels
- Factory automation systems
- Conveyor belt systems
- Packaging equipment
- Material handling systems
- HVAC control systems
- Process monitoring systems
- Pump and motor control panels
- Water treatment facilities
- Energy management systems
Typical Field Devices Connected
- Push buttons
- Limit switches
- Mechanical relays
- Control switches
- AC status indicators
- Safety interlocks
It is especially suitable for systems with large numbers of discrete AC input signals.
6. Product Advantages
6.1 High Channel Density
16 input channels in a compact module reduce cabinet space usage and improve system integration efficiency.
6.2 Reliable AC Signal Detection
The module is optimized for stable detection of 120V AC signals with strong noise immunity.
6.3 Clear Status Indication
Built-in LED indicators provide immediate visual feedback for troubleshooting and maintenance.
6.4 Modular Flexibility
Compatible with FLEX I/O architecture, allowing easy system expansion or modification.
6.5 Maintenance Efficiency
Hot-swappable design reduces downtime during module replacement.
6.6 Industrial Durability
Designed to operate under vibration, electrical interference, and temperature fluctuations.
6.7 Simple Wiring Structure
Non-isolated channel design simplifies wiring configuration in control cabinets.
7. Brand Overview
The product belongs to a globally established industrial automation technology provider specializing in:
- Programmable logic controllers
- Distributed I/O systems
- Industrial communication networks
- Motor control solutions
- Safety automation systems
- Motion control platforms
The brand is widely adopted in automotive manufacturing, oil and gas, food production, logistics systems, and heavy industrial automation environments.
Its products are known for robustness, long lifecycle support, and system-level compatibility.
8. Product Series Information
Series Name
FLEX I/O 1794 Series
Series Description
A distributed modular I/O platform designed for scalable industrial automation systems.
Key Characteristics
- Modular expansion capability
- Distributed I/O architecture
- Wide range of digital and analog modules
- DIN rail installation
- Hot-swappable design
- Industrial communication compatibility
- Flexible system configuration
The 1794-IA16 is part of the digital AC input module family within this platform.
9. Recommended Related Models (Same Series or Similar)
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1794-IA8 | AC input module | 8-channel AC input | 94 × 94 × 69 mm | 0.10 kg | Lower density input |
| 1794-IA16 | AC input module | 16-channel AC input | 94 × 94 × 69 mm | 0.11 kg | 120V AC input |
| 1794-IB16 | DC input module | 16-channel DC input | 94 × 94 × 69 mm | 0.32 kg | 24V DC input |
| 1794-OB16 | DC output module | 16-channel output | 94 × 94 × 69 mm | 0.30 kg | Transistor output |
| 1794-TB3 | Terminal base | Module wiring base | 94 × 94 × 69 mm | 0.19 kg | Screw terminal base |
10. Recommended Popular Models from Same Brand
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1756-L82E | PLC controller | ControlLogix processor | 145 × 175 × 52 mm | 0.92 kg | High performance CPU |
| 1769-L33ER | Compact PLC | CompactLogix controller | 118 × 87 × 87 mm | 0.60 kg | Integrated Ethernet |
| 1734-AENTR | Ethernet adapter | POINT I/O network module | 75 × 75 × 55 mm | 0.18 kg | Remote I/O communication |
| 2711P-T10C4D8 | HMI terminal | Operator interface panel | 271 × 212 × 60 mm | 1.80 kg | Touchscreen display |
| 20-COMM-E | Communication module | Drive Ethernet module | 140 × 95 × 30 mm | 0.22 kg | Industrial Ethernet |
11. Installation Notes
- Ensure correct terminal base matching before installation
- Maintain proper grounding inside control cabinet
- Separate AC input wiring from power cables
- Avoid excessive vibration during installation
- Confirm voltage compatibility (74–132V AC range)
- Tighten terminal screws securely
12. Maintenance Recommendations
- Inspect terminal tightness periodically
- Check LED indicators for abnormal status
- Ensure clean and dry cabinet environment
- Monitor wiring insulation condition
- Replace module if input detection becomes unstable
13. Summary
The 1794-IA16 is a high-density AC input module designed for industrial automation systems requiring reliable signal acquisition from 120V AC field devices. Its compact structure, stable performance, and modular integration capability make it a widely used component in distributed FLEX I/O architectures.
It is particularly suitable for large-scale control systems where multiple AC input points must be monitored efficiently while maintaining system flexibility and ease of maintenance.