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- Allen Bradley
- 1794-APB
- ControlNet Flex I/O Adapter Module
- USA
- 87.4 mm * 94 mm * 92 mm
- 0.3kg
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Technical Report: FLEX I/O PROFIBUS DP Adapter 1794-APB
1. Product Overview
The 1794-APB is a FLEX I/O PROFIBUS DP communication adapter module used in distributed industrial automation systems. It connects FLEX I/O terminal bases to a PROFIBUS DP fieldbus network and acts as a slave device under a PROFIBUS master controller (PLC or scanner).
This module enables deterministic data exchange between remote I/O stations and centralized control systems using the PROFIBUS DP protocol.
It supports up to 8 FLEX I/O modules per node, making it suitable for modular and scalable automation architectures.
2. Brand Information
- Brand: Industrial Automation Control Brand
- Product Category: Distributed I/O PROFIBUS Adapter
- Technology Field: Industrial Fieldbus / PROFIBUS DP Networks
- Manufacturing Origin: United States (varies by production batch)
3. Product Series
- Series Name: FLEX I/O Series
- System Architecture: Distributed modular I/O platform
- Network Type: PROFIBUS DP / DP-V1
- Installation Type: DIN rail / panel-mounted system
The FLEX I/O system is designed for flexible remote I/O expansion in industrial automation environments.
4. Product Introduction
The 1794-APB functions as a PROFIBUS DP slave adapter module that links FLEX I/O modules to a PROFIBUS network.
Key functions include:
- PROFIBUS DP communication up to 12 Mbps
- DP-V0 / DP-V1 cyclic and acyclic data exchange
- Support for up to 8 FLEX I/O modules
- Real-time deterministic communication with PLC master systems
- Built-in backplane power conversion (24V DC → 5V DC)
- Diagnostic and status indicators for network health
It is widely used in European-standard industrial automation systems.
5. Technical Parameters
5.1 Communication Performance
| Parameter | Value |
|---|---|
| Communication Protocol | PROFIBUS DP / DP-V1 |
| Communication Speed | up to 12 Mbps |
| Network Type | Master-Slave fieldbus |
| Max I/O Modules | up to 8 FLEX I/O modules |
| Data Exchange | Cyclic + Acyclic |
| Cable Type | Shielded twisted pair (RS-485) |
| Node Addressing | DIP switch / software configurable |
5.2 Electrical Performance
| Parameter | Value |
|---|---|
| Input Voltage Range | 19.2–31.2 V DC |
| Nominal Voltage | 24 V DC |
| Internal Backplane Power | 5 V DC (converted supply) |
| FlexBus Output Current | up to 640 mA @ 5 V DC |
| Input Current | ~330–450 mA typical |
| Power Dissipation | up to 7.6 W |
| Inrush Current | ~23 A (2 ms) |
| Isolation Voltage | industrial reinforced isolation |
Reference electrical data aligned with PROFIBUS adapter specifications
5.3 System Capability
| Parameter | Value |
|---|---|
| System Capacity | up to 8 FLEX I/O modules |
| Node Type | PROFIBUS DP slave adapter |
| Configuration Tool | PLC engineering software |
| Compatibility | FLEX I/O terminal base system |
| Diagnostic Function | LED status + network diagnostics |
5.4 Physical Dimensions & Weight
| Parameter | Value |
|---|---|
| Height | 87–94 mm (typical FLEX adapter range) |
| Width | 50–94 mm (module-dependent housing) |
| Depth | 87–92 mm |
| Mounting Type | DIN rail / panel mount |
| Weight | 0.25 kg – 0.30 kg (typical ~0.28 kg) |
| Form Factor | Single-slot communication adapter |
5.5 Environmental Conditions
| Parameter | Value |
|---|---|
| Operating Temperature | 0°C to 55°C |
| Storage Temperature | -40°C to 85°C |
| Humidity | 5%–95% non-condensing |
| Vibration Resistance | Industrial IEC standard |
| Shock Resistance | up to 30G |
Reference operating range consistent with PROFIBUS FLEX I/O modules
6. Product Applications
The 1794-APB is widely used in industrial automation systems requiring PROFIBUS DP communication.
Typical application areas:
- Automotive manufacturing systems
- Packaging machinery lines
- Process automation plants
- Conveyor and material handling systems
- Metal processing and steel plants
- Industrial robot I/O expansion
- Machine cell control systems
- Distributed factory automation networks
Functional role:
- PROFIBUS DP slave communication node
- Distributed I/O data acquisition interface
- PLC-to-field device communication bridge
- Modular automation expansion interface
7. Product Advantages
7.1 High-Speed Fieldbus Communication
Supports PROFIBUS DP up to 12 Mbps for fast deterministic control.
7.2 Modular System Expansion
Supports up to 8 FLEX I/O modules per adapter node.
7.3 Stable Industrial Protocol
Widely used and standardized fieldbus for European industrial systems.
7.4 Built-in Power Conversion
Internal conversion from 24V DC to 5V DC simplifies system wiring.
7.5 Strong Diagnostic Capability
LED indicators and network diagnostics improve maintenance efficiency.
7.6 Robust Industrial Design
Suitable for harsh electrical noise environments in factories.
8. Recommended Models (Same Series / Related Modules)
| Model | Description | Key Parameters |
|---|---|---|
| 1794-APBDPV1 | PROFIBUS DP V1 adapter | Enhanced diagnostic protocol support |
| 1794-AENTR | EtherNet/IP dual-port adapter | Industrial Ethernet networking |
| 1794-AENT | Standard EtherNet/IP adapter | Single-port Ethernet communication |
| 1794-ACN | ControlNet adapter | 5 Mbps deterministic network |
| 1794-ADN | DeviceNet adapter | CAN-based fieldbus system |
9. Recommended Models (Same Brand – Popular Modules)
| Model | Type | Key Parameters |
|---|---|---|
| 1756-EN2T | Ethernet communication module | ControlLogix Ethernet/IP interface |
| 1756-IB16 | Digital input module | 16-channel 24V DC input |
| 1756-OB16E | Digital output module | Electronic switching output |
| 1769-L33ER | PLC controller | CompactLogix CPU with Ethernet |
| 1769-PA4 | Power supply module | Industrial AC/DC power unit |
10. Summary
The 1794-APB is a PROFIBUS DP FLEX I/O adapter designed for distributed industrial automation systems requiring stable and deterministic fieldbus communication.
Its support for high-speed PROFIBUS networks, modular expansion capability, and robust industrial design makes it a widely adopted solution in process and manufacturing automation environments.