ControlLogix (1756 Series) | Allen-Bradley | 1756-OB16D /A ControlLogix PLC DC Ouput Module

Product Description: Allen-Bradley 1756-OB16D

The Allen-Bradley 1756-OB16D is a 16-point DC digital output module with sourcing (PNP) output configuration and built-in diagnostic capabilities. Designed for use in ControlLogix systems, this module not only delivers 24V DC control signals but also monitors output status and detects open-wire conditions. It is ideal for applications where increased visibility and reliability of field wiring and device operation are critical.

Key Features

• 16 sourcing (PNP) digital output channels
• Output diagnostics include:
  • Open-wire detection
• Individual channel status and fault LEDs
• Supports electronic protection with auto-recovery
• Time-stamped fault information available via controller
• Compatible with all ControlLogix chassis and controllers
• Field-removable terminal block (RTB) for simplified wiring

Technical Specifications

• Number of Outputs: 16
• Output Type: Sourcing (PNP), 24V DC
• Output Voltage Range: 10–31.2V DC
• Output Current:
  • 0.5 A per channel (max)
• Output Delay (Typical):
  • ON: 0.1 ms
• Diagnostic Features: Open-wire, no load, short-circuit, over-temperature
• Isolation Voltage: 250V (channel-to-backplane and channel-to-channel)
• Backplane Current:
  • 200 mA @ 5.1V DC
• Operating Temperature: 0°C to 60°C
• Mounting: Any slot in a ControlLogix chassis
• Certifications: UL Listed, CE, CSA, RoHS, Class I Div 2

Application Areas

• Automotive and assembly lines requiring reliable diagnostics
• Packaging systems with sensor-actuated outputs
• Industrial machinery with critical output verification needs
• Safety-rated systems needing output fault detection
• OEM control systems with preventive maintenance requirements

Advantages

• Enhanced diagnostics reduce downtime and improve troubleshooting
• Built-in protection increases system resilience and equipment life
• Per-channel LED feedback improves operator visibility
• Easy integration with Studio 5000 and Logix controllers
• Compact, high-density design for efficient panel space usage