Allen-Bradley 1756-OB16IS ControlLogix Isolated Digital Output Module

 

 

Product Overview

The Allen-Bradley 1756-OB16IS is a ControlLogix 16-point individually isolated DC digital output module designed for high-performance industrial automation systems. It provides isolated 24V DC output control for field devices such as solenoid valves, relays, contactors, indicators, and actuators.

Key Specifications

• Brand: Allen-Bradley (Rockwell Automation)
• Series: ControlLogix 1756 I/O
• Model: 1756-OB16IS
• Product Type: Digital DC Output Module
• Output Channels: 16 points
• Output Type: Individually isolated DC outputs
• Voltage Range: 10–30 VDC
• Output Current: 1 A per point @ 10–30 VDC
• Isolation Voltage: 250 V continuous between outputs
• Terminal Connection: 36-pin removable terminal block (RTB)
• Mounting: ControlLogix chassis slot
• Communication: Through ControlLogix backplane
• Compatible Controllers: ControlLogix series PLC systems

What It Does (Simple Explanation)

The 1756-OB16IS converts PLC control commands into electrical output signals.

Working process:

1. ControlLogix CPU executes the user program.
2. Output command is sent through the chassis backplane.
3. 1756-OB16IS activates the selected output channel.
4. External devices receive 24V DC control power.
5. Machine components perform the requested action.

Typical controlled devices:

• solenoid valves
• motor contactors
• indicator lamps
• pneumatic actuators
• industrial relays

Key Features

• 16 independent isolated output channels
• Supports 24V DC industrial devices
• Individual channel isolation improves system reliability
• Reduces electrical interference between loads
• Suitable for complex machine control systems
• LED status indicators for diagnostics
• Compatible with ControlLogix modular architecture

Advantages

• Higher protection: individual isolation helps prevent one faulty field device from affecting other outputs.
• Flexible wiring: each output can be used independently.
• Improved troubleshooting: channel-level indication makes fault finding easier.
• Industrial reliability: designed for continuous automation operation.
• Easy integration: works directly with ControlLogix processors and chassis systems.

Applications

• Factory automation equipment
• Automotive production lines
• Packaging machinery
• Process control systems
• Material handling systems
• Robotics cells
• Machine builders’ control panels