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- Allen Bradley
- 1794-OM16
- ControlNet Flex I/O Adapter Module
- USA
- 94 mm × 94 mm × 69 mm
- 0.25kg
- Xiamen, China
- New & In Stock
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Allen-Bradley 1794-OM16 Technical Overview and Engineering Guide
1. Product Introduction
The 1794-OM16 is a 16-channel relay output module in the FLEX I/O distributed control system. It is designed to provide discrete ON/OFF control signals for industrial field devices such as contactors, solenoids, indicator lamps, and small motors.
Unlike transistor-based output modules, this model uses electromechanical relays, making it suitable for AC or DC switching applications where electrical isolation and load flexibility are required.
The module is mounted on a FLEX I/O terminal base and integrated into a distributed control architecture, allowing decentralized control with reduced wiring complexity.
2. Product Parameters
Electrical Specifications
| Parameter | Specification |
|---|---|
| Output Type | 16-channel relay output |
| Relay Type | Electromechanical relay (Form A) |
| Contact Configuration | Normally Open (NO) |
| Switching Voltage | 5–264 V AC / 5–125 V DC |
| Max Switching Current | 2.0 A per channel |
| Total Module Current | 8 A (typical load dependent) |
| Contact Resistance | ≤ 100 mΩ |
| Electrical Life | ≥ 100,000 operations |
| Mechanical Life | ≥ 20 million operations |
| Response Time | ~10 ms operate / release |
| Isolation | Channel-to-backplane isolation |
| Power Supply | 24 V DC nominal |
| Power Consumption | ~4.5 W |
| FlexBus Current | ~120 mA @ 5 V DC |
Mechanical Specifications
| Parameter | Specification |
|---|---|
| Dimensions (H × W × D) | 94 mm × 94 mm × 69 mm |
| Weight | ~0.25 kg |
| Mounting Type | DIN rail (FLEX I/O terminal base system) |
| Compatible Bases | 1794-TB2 / TB3 / TB3S / TB3T |
| Wiring Method | Screw terminal base |
| Status Indicators | 16 LED channel indicators |
Environmental Specifications
| Parameter | Specification |
|---|---|
| Operating Temperature | 0 to 55 °C |
| Storage Temperature | -40 to 85 °C |
| Humidity | 5–95% non-condensing |
| Vibration Resistance | 5 g (10–500 Hz) |
| Shock Resistance | 30 g |
| Protection Level | IP20 system level |
3. Product Features
The 1794-OM16 is designed for reliable switching of industrial loads using relay-based output technology.
- 16-channel relay output design
- Supports both AC and DC load switching
- Electrical isolation between channels and system backplane
- LED indicators for each output channel
- High load flexibility for mixed industrial applications
- Modular design for easy installation and replacement
- Suitable for both low-voltage control and higher-voltage switching
- Stable operation in industrial control environments
The relay design allows it to handle a wide variety of load types that cannot be directly driven by transistor outputs.
4. Product Applications
The module is widely used in industrial automation systems requiring flexible switching capability, including:
- Motor starter control circuits
- Solenoid valve control systems
- Industrial lighting control
- Conveyor system control
- Pump and compressor control
- HVAC control systems
- Machine automation systems
- Relay-based switching panels in distributed I/O systems
It is especially useful in mixed-load environments where both AC and DC devices are controlled.
5. Product Advantages
- Supports both AC and DC load switching
- High electrical isolation improves system safety
- Flexible compatibility with a wide range of field devices
- No need for external relays in many applications
- LED indicators simplify diagnostics and maintenance
- Modular design reduces wiring complexity
- Suitable for mixed industrial load environments
- High mechanical durability for long service life
6. Series and System Information
| Category | Description |
|---|---|
| Series | FLEX I/O 1794 Series |
| System Type | Distributed modular I/O platform |
| Module Type | Relay output module |
| Architecture | Remote I/O with terminal base system |
The FLEX I/O 1794 series supports mixed configurations of digital, analog, and relay modules, enabling flexible distributed automation system design.
7. Recommended Modules – Same Series or Related Models
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1794-OB16P | Digital Output Module | 16-point protected DC output | 24 V DC | ~0.10 | 94×94×69 mm |
| 1794-OB16D | Digital Output Module | 16-point diagnostic output | 24 V DC | ~0.12 | 94×94×69 mm |
| 1794-OB8EP | Protected Output Module | 8-point electronic fused output | 24 V DC | ~1.0 | 94×94×69 mm |
| 1794-IB16P | Digital Input Module | 16-point protected input | 24 V DC | ~0.10 | 94×94×69 mm |
| 1794-IE8 | Analog Input Module | 8-channel analog input | — | ~0.18 | 94×94×69 mm |
8. Recommended Popular Modules – Same Platform
| Model | Type | Function | Voltage | Weight (kg) | Dimensions |
|---|---|---|---|---|---|
| 1756-OB16E | Control Output Module | 16-channel DC output | 24 V DC | ~0.30 | 150×90×100 mm |
| 1756-IB16I | Control Input Module | 16-channel isolated input | 24 V DC | ~0.30 | 150×90×100 mm |
| 1734-OB8 | Compact Output Module | 8-channel distributed output | 24 V DC | ~0.10 | 56×75×50 mm |
| 1769-IQ16 | Compact Input Module | 16-channel digital input | 24 V DC | ~0.25 | 118×87×40 mm |
| 1769-OB16 | Compact Output Module | 16-channel digital output | 24 V DC | ~0.25 | 118×87×40 mm |
9. Engineering Summary
The 1794-OM16 is a flexible relay-based output module designed for industrial automation systems requiring mixed AC/DC load switching capability.
Its main strengths include wide load compatibility, high electrical isolation, long mechanical life, and flexible integration into distributed I/O systems.
Compared with transistor output modules, it provides broader application flexibility, especially in systems where different voltage levels and load types must be controlled within the same platform.