Allen-Bradley 1756-OB8EI | Isolated DC Output Module

Allen-Bradley 1756-OB8EI ControlLogix 8-Point Isolated DC Output Module

The Allen-Bradley 1756-OB8EI is an isolated DC output module designed for critical control applications. It provides channel-to-channel isolation and electronic fusing for enhanced reliability and safety.

Technical Specifications

• Brand & Model: Allen-Bradley 1756-OB8EI
• Output Configuration: 8 Isolated Sourcing DC Outputs
• Output Voltage: 10 - 30 Volts DC (24V DC nominal)
• Current per Point: 2 Amps at 60°C
• Total Module Current: 16 Amps at 55°C
• Response Time: 1 ms (ON), 5 ms (OFF)
• Surge Rating: 4 Amps for 10 milliseconds
• Isolation Rating: 250V continuous (tested at 1350V)
• Voltage Drop: 1.2V maximum at 2A
• Off-State Leakage: <1 mA per point
• Power Dissipation: 4.7 Watts at 60°C
• Backplane Power: 1.3W (250 mA @ 5.1V)
• Operating Temperature: 0°C to 60°C
• Weight: Approximately 0.3 kg (0.66 lbs)

FAQ

• Q: What is the 1756-OB8EI module's key advantage?
  A: Its primary advantage is per-point isolation, which ensures that a short circuit or fault on one output channel does not disable the entire module or other connected devices.
• Q: How do the electronic fuses work?
  A: They monitor current on each channel. If an overcurrent condition is detected, the electronic circuit limits or cuts off power to that specific channel and can report the fault to the controller for diagnostics.
• Q: Is it suitable for safety applications?
  A> While it offers robust isolation, it is not a certified safety module. For SIL or PL-rated safety functions, a dedicated safety output module (like 1756-OB8EIS) should be used.

Technical Documentation

Download Detailed Specifications (PDF)

For pricing and technical support for the 1756-OB8EI, contact us at sale@etowonauto.com.