The Allen Bradley 1794-IB8S is a FLEX I/O Guard I/O safety digital input module designed for safety-critical industrial applications requiring reliable monitoring of emergency stop devices, safety interlocks, light curtains, and other protective field equipment. Engineered as part of the Allen Bradley Guard I/O family, this module delivers high-integrity safety input processing while integrating seamlessly into distributed FLEX I/O architectures.
The 1794-IB8S supports SIL 3 and Category 4 safety applications when properly configured within a certified safety system, making it a trusted choice for machine safety, process protection, and personnel safeguarding in demanding industrial environments.
Technical Specifications
| Specification | Details |
|---|---|
| Manufacturer | Allen Bradley (Rockwell Automation) |
| Model Number | 1794-IB8S |
| Product Family | FLEX I/O Guard I/O |
| Module Type | Safety Digital Input Module |
| Input Channels | 8 safety inputs |
| Input Voltage | 24V DC nominal |
| Operating Voltage Range | 18–30V DC |
| Input Type | Safety-rated sinking inputs |
| Safety Rating | SIL 3 / PLe / Category 4 capable |
| Input Current | Approx. 6 mA per channel |
| Response Time | Fast safety-state detection |
| FlexBus Current Draw | Approx. 75 mA @ 5V DC |
| Power Dissipation | Approx. 4.5–5.5 W |
| Isolation Voltage | Industrial-rated field-to-system isolation |
| Diagnostics | Per-channel status and fault diagnostics |
| Indicators | Individual safety input LEDs |
| Compatible Networks | EtherNet/IP, ControlNet, DeviceNet via FLEX adapters |
| Mounting Type | DIN rail with FLEX terminal base |
| Compatible Terminal Bases | 1794-TB3S, 1794-TBNF, compatible FLEX safety bases |
| Operating Temperature | 0°C to 55°C |
| Protection Rating | IP20 |
Physical Dimensions & Weight (L × W × H Combined)
| Parameter | Specification |
|---|---|
| Dimensions (L × W × H) | Approx. 94 × 94 × 69 mm |
| Weight | Approx. 0.12 kg |
Recommended Related Models
The 1794-IB8S is typically deployed within integrated GuardLogix and FLEX safety architectures.
| Related Model | Description |
|---|---|
| 1794-OB8S | Safety digital output module |
| 1794-IB16 | Standard digital input module |
| 1794-OB16 | Standard digital output module |
| 1794-AENTR | Redundant EtherNet/IP adapter |
| 1794-ACN15 | ControlNet adapter |
| 1794-TB3S | Safety terminal base |
| 1756-L81ES | GuardLogix safety controller |
| 1734-IB8S | POINT Guard I/O safety input module |
| 440R-N23132 | Guardmaster safety relay |
| 440L safety light curtain series | Machine safety devices |
Popular Allen Bradley Automation Products
Allen Bradley safety and automation products are widely used in industrial facilities requiring high reliability, integrated diagnostics, and advanced machine protection.
| Popular Model | Product Category |
|---|---|
| 1756-L85E | ControlLogix Controller |
| 1756-L81ES | GuardLogix Safety Controller |
| 5069-IF8 | Analog Input Module |
| 2711P-T12C4D8 | PanelView Plus HMI |
| 20G11NC072AA0NNNNN | PowerFlex 755 Drive |
| 1734-AENTR | POINT I/O EtherNet/IP Adapter |
| 440R Guardmaster Series | Safety Relays |
| 1756-EN2TR | EtherNet/IP Communication Module |
| 1794-OB8S | FLEX Safety Output Module |
| 25B-D013N114 | PowerFlex 525 Drive |
