Reliable 120VAC Signal Interface for Industrial Automation Systems
The Allen Bradley 1794-IA16 Flex I/O AC Digital Input Module is designed to provide dependable AC signal acquisition for distributed industrial control systems. As part of the FLEX I/O family, this module enables direct interfacing with 120VAC field devices, offering stable and efficient input monitoring for PLC-based automation architectures.
Engineered for durability and consistent performance, the 1794-IA16 supports high-density input configurations while maintaining a compact footprint. It is widely used in manufacturing environments where reliable AC signal detection, simplified wiring, and modular expansion are essential for efficient machine control.
Technical Specifications & Physical Characteristics
| Specification Item | Details |
|---|
| Product Series | FLEX I/O |
| Module Type | AC Digital Input Module |
| Manufacturer | Allen Bradley |
| Model Number | 1794-IA16 |
| Input Channels | 16 Non-isolated AC Inputs |
| Input Voltage Range | 74–132 VAC (Nominal 120 VAC) |
| OFF-State Voltage Max | 20 VAC |
| Input Current | Approx. 5.5–14.8 mA |
| Nominal Input Current | ~12 mA @ 120 VAC |
| Backplane Current (FlexBus) | ~20 mA |
| Power Dissipation | ~6.4 W max |
| Input Type | AC Discrete Signal |
| Channel Isolation | Non-isolated |
| Indicator LEDs | 16 Yellow Channel Status LEDs |
| Mounting Type | DIN Rail / FLEX I/O Base |
| Compatible Terminal Bases | 1794-TB3, TB3S, TBN, TB3K, TB3SK, TBNK |
| 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. 0.25–0.30 kg |
Industrial Application Areas
The 1794-IA16 module is commonly used in industrial environments where multiple AC field signals must be reliably monitored within a distributed control system.
Typical applications include:
-
Factory automation systems
-
Industrial machine monitoring
-
Conveyor and material handling systems
-
Packaging machinery control panels
-
Motor and contactor status feedback
-
Process control input acquisition
-
Automotive production lines
-
OEM machine designs
-
Remote I/O panel installations
-
Legacy system upgrades and expansions
Key Features & Operational Advantages
High-Density 16-Channel AC Input Design
Provides efficient monitoring of up to 16 AC signals in a single compact module, reducing cabinet space and wiring complexity.
Industrial 120VAC Compatibility
Supports standard industrial AC voltage ranges, making it ideal for direct interfacing with field devices such as switches, relays, and contactors.
Clear Channel Diagnostics
Each input channel includes a dedicated LED indicator, enabling fast visual status checking and troubleshooting.
Modular FLEX I/O Integration
Designed for seamless integration with FLEX I/O adapters, supporting EtherNet/IP, ControlNet, DeviceNet, and Remote I/O architectures.
Compact and Space-Saving Layout
Optimized for DIN rail installation within distributed control systems, helping reduce overall panel footprint.
Stable Industrial Performance
Built for continuous operation in demanding environments with strong resistance to vibration and temperature variation.
Flexible System Expansion
Easily integrates into existing FLEX I/O systems, allowing scalable I/O architecture without major redesign.
Technical FAQs
1. What is the main function of the 1794-IA16 module?
It is an AC digital input module used to read 120VAC discrete signals in FLEX I/O systems.
2. How many input channels does it support?
It provides 16 AC input channels.
3. What is the nominal input voltage?
The module is designed for approximately 120VAC (74–132VAC operating range).
4. Is the module isolated per channel?
No, the inputs are non-isolated across channels.
5. What is the typical input current?
Around 12 mA at 120VAC nominal conditions.
6. What system does it connect to?
It connects to FLEX I/O adapters such as EtherNet/IP, ControlNet, DeviceNet, or Remote I/O modules.
7. What type of devices can it read?
It reads AC field devices such as switches, relays, and contactor auxiliary contacts.
8. Does it require a terminal base?
Yes, compatible FLEX I/O terminal bases are required for wiring and installation.
9. Is it suitable for harsh environments?
Yes, it is designed for industrial environments with vibration and temperature tolerance.
10. Can it be used in modern automation systems?
Yes, it is still widely used in both new and legacy distributed I/O architectures.
A DCS Q Co., Ltd. - PLC and DCS Industrial Control Equipment Wholesale
