The Allen Bradley 1794-ASB2 is a FLEX I/O Remote I/O adapter module designed to connect a small FLEX I/O station to a traditional Allen-Bradley Remote I/O (RIO) network. It is a simplified, space-efficient variant of the 1794-ASB family, engineered for applications where only a limited number of I/O modules are required while maintaining deterministic scan-based communication.
This module is commonly used in legacy PLC systems such as PLC-5 and SLC-based architectures, where Remote I/O remains in operation and system upgrades are incremental rather than full replacements.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Model Number | 1794-ASB2 |
| Product Family | FLEX I/O |
| Module Type | Remote I/O Adapter Module |
| Communication Protocol | Universal Remote I/O (RIO) |
| Communication Rates | 57.6 kbps / 115.2 kbps / 230.4 kbps |
| Network Interface | 1 × RIO channel |
| Input Voltage | 24 V DC (19.2–31.2 V DC) |
| Current Consumption | Approx. 330–450 mA |
| I/O Capacity | Up to 2 FLEX I/O modules |
| FlexBus Output Current | Max 640 mA @ 5 V DC |
| Power Dissipation | Approx. 3.4–4.2 W |
| Isolation Voltage | Up to 750–850 V DC (system dependent) |
| Diagnostics | Power / Network / Fault LED indicators |
| Mounting Type | DIN rail / FLEX I/O base system |
| Function | Compact remote I/O communication adapter |
Physical Dimensions & Weight
| Mechanical Parameter | Specification |
|---|---|
| Overall Dimensions (L × W × H) | Approx. 87 × 69 × 69 mm |
| Net Weight | Approx. 0.20–0.25 kg |
Recommended Related Models
The 1794-ASB2 is typically used in compact FLEX I/O systems where limited expansion is required.
| Related Model | Description |
|---|---|
| 1794-ASB | Standard Remote I/O Adapter (up to 8 modules) |
| 1794-IB8 | Digital Input Module |
| 1794-OB8 | Digital Output Module |
| 1794-IE4 | Analog Input Module |
| 1794-OE2 | Analog Output Module |
| 1794-TB2 | Terminal Base Unit |
| 1794-TB3 | Terminal Base Unit |
| 1794-AENT | EtherNet/IP Adapter Module |
| 1794-AENTR | Redundant EtherNet/IP Adapter |
| 1794-ACN15 | ControlNet Adapter Module |
Popular Allen Bradley Automation Products
Allen Bradley systems are widely used in industrial automation environments for their durability, installed base, 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 |
