What Is the 1756-OB16IS?

When an automation system demands precise output timing and robust isolation, the 1756-OB16IS from Allen-Bradley provides a reliable solution. This ControlLogix I/O module sits in a 1756 chassis slot and offers 16 individually isolated outputs. Among these, 8 outputs are scheduled for synchronized operation. Engineers rely on this module for applications where signal integrity and isolation are critical.

Key Features & Technical Specs

• The 1756-OB16IS operates at 10-30 Volts DC with a voltage category of 12/24 Volts DC Sink/Source.
• It draws 350 milliamperes at 5.1 Volts and 2.5 milliamperes at 24 Volts from the backplane.
• Maximum power dissipation is 3.3 Watts at 60 Celsius.
• Pilot duty rating is 2 A (DC-13SQ).
• The module has an open-style enclosure with no enclosure type.

A distinctive feature is the 8 scheduled outputs that synchronize within Coordinated System Time (CST). This capability allows precise coordination in motion control and time-critical processes, reducing jitter and improving overall system performance.

Applications & Use Cases

In high-speed manufacturing lines, the 1756-OB16IS ensures that output signals arrive exactly when needed. For example, in a packaging machine, scheduled outputs can trigger actuators at precise intervals. The individually isolated outputs also protect against ground loops in noisy industrial environments. This module is ideal for applications requiring both isolation and timing accuracy.

Installation & Setup

To install the 1756-OB16IS, insert it into any available slot in a 1756 chassis. Ensure the backplane power is off during installation. The module uses a 36-pin connector for field wiring. Refer to the Allen-Bradley installation manual for proper wiring diagrams and torque specifications. After mounting, configure the module using your ControlLogix controller software.

Maintenance & Reliability

Regular inspection of the 1756-OB16IS helps maintain reliable operation. Check for loose connections and signs of overheating. The module is rated for operation up to 60 Celsius ambient temperature. Keeping the chassis clean and ensuring adequate airflow prolongs module life. Follow the manufacturer's guidelines for periodic testing.

Compatibility & Integration

The 1756-OB16IS integrates seamlessly with ControlLogix controllers and 1756 chassis. It works with Rockwell Automation's Studio 5000 environment for configuration and programming. The module supports scheduled outputs when used with a CIPSync-capable controller. No additional communication protocols are required for basic operation.

FAQ about 1756-OB16IS

Q: How many outputs does the 1756-OB16IS have?

A: The module has 16 individually isolated outputs, with 8 of those being scheduled outputs.

Q: What is the operating voltage range for the 1756-OB16IS?

A: The operating voltage is 10-30 Volts DC, with a voltage category of 12/24 Volts DC Sink/Source.

Q: What is the current draw of the 1756-OB16IS from the backplane?

A: It draws 350 milliamperes at 5.1 Volts and 2.5 milliamperes at 24 Volts.

Q: What is the maximum power dissipation of the 1756-OB16IS?

A: The maximum power dissipation is 3.3 Watts at 60 Celsius.

Q: What is the pilot duty rating of the 1756-OB16IS?

A: The pilot duty rating is 2 A (DC-13SQ).

Q: Does the 1756-OB16IS require a specific enclosure?

A: No, the module comes with an open-style enclosure type.

Product Support & Availability

The 1756-OB16IS is available from PetroPartsOnline. We stock this module and can ship it promptly. Contact our team for current pricing and lead times.