The Allen Bradley 1794-APB is a FLEX I/O PROFIBUS DP adapter module designed to connect distributed FLEX I/O systems to a PROFIBUS network. It serves as a communication interface between a PROFIBUS master (such as a PLC or DCS controller) and up to 8 FLEX I/O modules, enabling deterministic and high-speed data exchange in industrial automation environments.
Engineered for reliable fieldbus integration, the 1794-APB is widely used in process industries and manufacturing plants where PROFIBUS remains a core communication standard. It provides stable I/O data handling, strong electrical isolation, and flexible integration with Allen Bradley control systems.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Model Number | 1794-APB |
| Product Family | FLEX I/O |
| Module Type | PROFIBUS DP Adapter Module |
| Communication Protocol | PROFIBUS DP |
| Communication Speed | Up to 12 Mbps |
| Network Interface | 1 × 9-pin D-SUB connector |
| Input Voltage | 24 V DC (19.2–31.2 V DC) |
| Current Consumption | Approx. 400–450 mA |
| I/O Capacity | Up to 8 FLEX I/O modules |
| FlexBus Output Current | Max 640 mA @ 5 V DC |
| Power Dissipation | Approx. 7.68 W |
| Isolation Voltage | 850 V DC |
| Diagnostics | Status and PROFIBUS LED indicators |
| Mounting Type | DIN rail / panel mount |
| Function | Remote I/O communication adapter |
Physical Dimensions & Weight
| Mechanical Parameter | Specification |
|---|---|
| Overall Dimensions (L × W × H) | Approx. 87 × 69 × 69 mm |
| Net Weight | Approx. 0.20–0.23 kg |
Recommended Related Models
The 1794-APB is typically used in PROFIBUS-based FLEX I/O systems alongside compatible I/O modules and modern migration adapters.
| Related Model | Description |
|---|---|
| 1794-IB16 | Digital Input Module |
| 1794-OB16 | Digital Output Module |
| 1794-IE8 | Analog Input Module |
| 1794-OE4 | Analog Output Module |
| 1794-TB3 | Terminal Base Unit |
| 1794-TB2 | Terminal Base Unit |
| 1794-AENT | EtherNet/IP Adapter Module |
| 1794-AENTR | Redundant EtherNet/IP Adapter |
| 1794-ACN15 | ControlNet Adapter Module |
| 1756-DNB | DeviceNet Scanner Module |
Popular Allen Bradley Automation Products
Allen Bradley automation systems are widely used in industrial control environments for their reliability, modularity, and long lifecycle support.
| Popular Model | Product Category |
|---|---|
| 1756-L85E | ControlLogix Controller |
| 1769-L36ERM | CompactLogix Controller |
| 5069-IF8 | Analog I/O Module |
| 2711P-T12C4D8 | PanelView HMI |
| 20G11NC072AA0NNNNN | PowerFlex 755 Drive |
| 1734-AENTR | POINT I/O Adapter |
| 1606-XLS240E | Industrial Power Supply |
| 1756-EN2TR | Ethernet/IP Communication Module |
| 1794-IE8 | FLEX I/O Analog Module |
| 25B-D013N114 | PowerFlex 525 Drive |
