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- Allen Bradley
- 1794-IB8
- ControlNet Flex I/O Adapter Module
- USA
- 94 × 94 × 69 mm
- 0.09kg
- Xiamen, China
- New & In Stock
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1794-IB8 FLEX I/O 8-Point DC Input Module – Detailed Technical Overview
1. Product Introduction
The 1794-IB8 is a compact 8-channel 24V DC digital input module designed for the FLEX I/O distributed automation platform. It is used to collect ON/OFF status signals from field devices such as sensors, switches, and relay contacts and transmit these signals to a PLC system through a modular backplane.
This module is designed for low to medium signal density applications where space efficiency and reliable signal acquisition are required.
It is part of a modular I/O system that allows field wiring to be terminated on a terminal base while the electronic module can be replaced quickly without rewiring.
2. Product Features
- 8-channel 24V DC sinking digital inputs
- Compact low-density I/O design
- LED status indicators for each input channel
- DIN rail mounting system
- Modular plug-in architecture
- Hot-swappable module capability
- Stable industrial signal acquisition
- Compatible with FLEX I/O terminal bases
- Low power consumption design
- Flexible system integration
3. Technical Parameters
| Parameter | Specification |
|---|---|
| Model | 1794-IB8 |
| Product Type | DC digital input module |
| Series | FLEX I/O 1794 Series |
| Input Channels | 8 channels |
| Input Type | 24V DC sinking |
| Input Voltage Range | 10–31.2V DC |
| Nominal Input Voltage | 24V DC |
| ON-State Current | 2–12 mA per channel |
| Off-State Current | ≤1.5 mA |
| Input Impedance | ~4.6 kΩ |
| FlexBus Current | ~20 mA |
| Power Dissipation | ~3.5 W max |
| Thermal Dissipation | ~11.9 BTU/hr |
| Isolation Voltage | 50V basic isolation |
| Channel Isolation | No channel-to-channel isolation |
| Indicator Lights | 8 LED status indicators |
| Mounting Type | DIN rail |
| Terminal Base | TB3 / TB3S compatible |
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Humidity Range | 5%–95% non-condensing |
| Vibration Resistance | 5g (10–500 Hz) |
| Shock Resistance | 30g |
| IP Rating | IP20 |
| Dimensions | 94 × 94 × 69 mm |
| Weight | 0.09 kg |
4. Product Function Description
The 1794-IB8 functions as a digital signal acquisition module in industrial control systems.
Each of the 8 channels monitors the presence of a 24V DC signal from field devices. When a signal is detected, it is converted into a digital bit and transmitted to the PLC via the FLEX I/O backplane.
The module does not perform logic control; instead, it acts as an interface between field wiring and the control system.
Its compact design makes it suitable for applications with limited I/O requirements or distributed small signal clusters.
5. Product Applications
The 1794-IB8 is widely used in small to medium industrial automation systems requiring limited digital input points.
Typical Applications
- Small machine control systems
- Conveyor sub-systems
- Packaging machines
- Auxiliary control panels
- HVAC systems
- Pump control stations
- Building automation systems
- Laboratory automation setups
- Remote I/O nodes
- OEM machinery
Typical Field Devices
- Push buttons
- Limit switches
- Proximity sensors
- Relay contacts
- Alarm signals
- Basic safety switches
6. Product Advantages
6.1 Compact Design
8-channel configuration is ideal for small-scale distributed I/O requirements.
6.2 Low Power Consumption
Efficient electrical design reduces system load.
6.3 Stable Signal Processing
Reliable 24V DC input detection in industrial environments.
6.4 Easy Maintenance
Hot-swappable design allows quick replacement without rewiring.
6.5 Simple Integration
Compatible with FLEX I/O architecture for flexible expansion.
6.6 Clear Diagnostics
LED indicators provide immediate visual status feedback.
6.7 Cost-Effective Solution
Lower channel density reduces unnecessary system complexity.
7. Brand Overview
This product belongs to a globally established industrial automation technology provider specializing in:
- PLC systems
- Distributed I/O platforms
- Industrial communication networks
- Motion and safety control systems
- Factory automation solutions
Its systems are widely used in manufacturing, energy, automotive, logistics, and process industries due to reliability, modularity, and long lifecycle support.
8. Product Series Information
Series Name
FLEX I/O 1794 Series
Series Type
Distributed modular I/O system
Key Characteristics
- Modular expansion design
- DIN rail installation
- Hot-swappable modules
- Wide range of digital and analog I/O
- Flexible system architecture
- Reduced wiring complexity
- Industrial network compatibility
The 1794-IB8 is the entry-level digital input module in this series.
9. Recommended Related Models (Same Series or Similar)
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1794-IB8 | DC input module | 8-channel input | 94 × 94 × 69 mm | 0.09 kg | Compact low-density input |
| 1794-IB16 | DC input module | 16-channel input | 94 × 94 × 69 mm | 0.11 kg | Medium-density input |
| 1794-IB32 | DC input module | 32-channel input | 94 × 94 × 69 mm | 2.0 kg | High-density input |
| 1794-OB8 | DC output module | 8-channel output | 94 × 94 × 69 mm | 0.10 kg | Compact output module |
| 1794-TB3 | Terminal base | Wiring base | 94 × 94 × 69 mm | 0.19 kg | Standard base unit |
10. Recommended Popular Models from Same Brand
| Model | Product Type | Function | Dimensions | Weight (kg) | Key Parameters |
|---|---|---|---|---|---|
| 1756-L81E | PLC controller | ControlLogix CPU | 145 × 175 × 52 mm | 0.92 kg | High-performance processor |
| 1769-L33ER | Compact PLC | CompactLogix controller | 118 × 87 × 87 mm | 0.60 kg | Integrated Ethernet |
| 1734-AENTR | Ethernet adapter | POINT I/O communication | 75 × 75 × 55 mm | 0.18 kg | Distributed I/O network |
| 2711P-T10C4D8 | HMI panel | Operator interface | 271 × 212 × 60 mm | 1.80 kg | Touchscreen HMI |
| 20-COMM-E | Drive communication module | Ethernet interface | 140 × 95 × 30 mm | 0.22 kg | Industrial communication |
11. Installation Notes
- Confirm correct terminal base compatibility before installation
- Maintain proper grounding in control cabinet
- Separate signal wiring from power lines
- Ensure stable 24V DC power supply
- Avoid mechanical stress on connectors
- Secure DIN rail installation properly
12. Maintenance Recommendations
- Inspect LED indicators regularly
- Check wiring connections for looseness
- Monitor input signal stability
- Keep enclosure clean and dry
- Replace module if abnormal behavior occurs
13. Summary
The 1794-IB8 is a compact and reliable 8-channel DC input module designed for distributed industrial automation systems. Its small footprint, stable performance, and modular architecture make it ideal for applications requiring limited but reliable digital input acquisition.
It is best suited for small-scale automation systems, auxiliary control panels, and distributed I/O nodes where simplicity and reliability are key requirements.