1794-OB8EP/A Allen Bradley Module 8 Point 24VDC Industrial Hot Swap Digital

Product Specification

1.Product Overview​

The ​Allen-Bradley 1794-OB8EP/A FLEX™ I/O Safety Output Module​ provides SIL 3/PLe (Cat. 4) safety-rated control for critical machinery shutdown systems. Designed for Rockwell’s FLEX I/O platform, this 8-channel module delivers ​24V DC protected outputs​ with redundant microprocessors and dual-channel diagnostics. Its compact form integrates ​500mA continuous sourcing per point​ with cross-monitored short-circuit/open-load detection (<5ms diagnostic resolution). Housed in rugged polycarbonate with nickel-plated copper contacts, it operates at ​​-40°C to +70°C​ and withstands 5g vibrations (IEC 60068-2-6). Integrated galvanic isolation (250V AC) and surge suppression (4kV per IEC 61000-4-5) ensure failsafe performance in electrical noise-heavy environments.

2.​Critical Technical Specifications​

​Performance-defining parameters:

• ​Safety Rating: SIL 3 (IEC 61508), PLe Cat. 4 (ISO 13849-1)
• ​Output Channels: 8× 24V DC sourcing (500mA continuous/point, 4A peak 100ms)
• ​Isolation: 250V AC channel-to-bus, 1500V AC field-to-backplane
• ​Response Time: ≤3ms OFF→ON (resistive loads), configurable OFF-delay (0–10s)
• ​Short-Circuit Current: Automatic current limiting with latch/auto-reset modes
• ​Diagnostics: Dual-channel comparison (<50µs deviation tolerance)
• ​Connection: 1794-TBN terminal block (IP20) or 1794-TBSH (IP67 rated)
• ​Hazardous Certification: Class 1 Div 1 Groups A–D, ATEX Zone 1
• ​Backplane Power: 80mA @ 5V DC, 200mA max @ 24V field power

3.​Targeted Applications​

​Mission-critical safety systems:

• ​Automotive Press Lines: Emergency-stop actuation for 1,000-ton stamping presses
• ​Robotic Workcells: Safety door monitoring with dual-channel validation
• ​Chemical Processing: Emergency vent solenoids in ATEX Zone 1 environments
• ​Pharmaceuticals: Aseptic isolator interlocks with 21 CFR Part 11 compliance
• ​Material Handling: Roller conveyor brake releases requiring SIL 3 integrity
• ​Energy Generation: Turbine overspeed shutdown valves (API 670 SIL 2+)
  Guarantees functional safety for safety relays, solenoid valves, and alarm strobes.

4.​Competitive Advantages​

​Operational superiorities:

• ​Diagnostic Precision: Patented ​Test Output Safety (TOS)​​ technology injects test pulses without disrupting loads
• ​Zero Downtime: Hot-swappable module replacement with firmware persistence
• ​Safety Flexibility: Configures as 8 single-point or 4 dual-channel outputs
• ​Space Efficiency: 45mm width fits high-density safety cabinets (saves 60% vs. relay solutions)
• ​Wiring Economy: Plug-and-play 1794-TBSH terminals reduce commissioning by 80%
• ​Synchronization: ±1ms output synch across modules via 1794-ACNR adapter
• ​Lifecycle Durability: 10M+ mechanical cycles (50× relay lifespan)

5.Functional Capabilities​

​Advanced safety functions:

• ​Pulse Testing: Automated <500µs self-checks validate output circuit integrity hourly
• ​Force Feedback: Verifies physical output state matches command via readback diagnostics
• ​Dynamic Load Monitoring: Detects coil degradation (≤±5mA drift) in solenoids
• ​Field Configurability: Adjust hold/release timing for dynamic braking applications
• ​Fault Masking: Ignore transient errors (<100µs) during motor in-rush
• ​Override Protection: Password-locked maintenance bypass modes
• ​Safety Tagging: Exports diagnostics as Produced Tags for FactoryTalk® View safety displays

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Packaging & Shipping

Company Information
Xiamen ZhiCheng Automation Technology Co., Ltdit is a leading global supplier of control system components. We specialize in control systems and drives.
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