Allen-Bradley 1756-OB16IF ControlLogix Fast Isolated DC Output Module

The 1756-OB16IF is a high-speed, digitally-isolated DC output module designed for the Allen-Bradley ControlLogix 1756 chassis platform. This module provides 16 independent sourcing output channels, enabling precise control for demanding industrial applications such as high-speed sorting, indexing, and synchronized motion control. With sub-millisecond response times and per-point isolation, it effectively manages complex electrical environments while protecting backplane components from field-side surges.

Features

• 16 individually isolated digital DC sourcing output channels.
• Fast execution speed with response transitions under 25 microseconds.
• Per-point electronic fusing for enhanced circuit protection and diagnostic feedback.
• Supports CIP Sync protocol for high-precision network synchronization.
• Hot-swappable design allows for module replacement without interrupting system power.
• Front-panel LED indicators for real-time channel status and module health monitoring.

Applications

This module is engineered for high-performance automation tasks requiring rapid switching and electrical isolation, including:

• High-speed product sorting and packaging lines.
• Automated assembly and indexing machinery.
• Synchronized cutting and motion-critical industrial processes.
• Systems requiring mixed-voltage DC power sources on a single I/O card.

Technical Specifications

Installation Guidelines

• Ensure the ControlLogix chassis is powered down before inserting or removing the module.
• Use a compatible Removable Terminal Block (RTB) such as the 1756-TBCH or 1756-TBS6H for field wiring.
• Maintain proper grounding practices for the chassis to ensure electromagnetic compatibility and safety.
• Route signal wiring away from high-voltage power lines and sources of significant electromagnetic interference (EMI).
• Verify that the field power supply is within the 10-30 VDC range before energizing the output loops.
• Ensure adequate ventilation in the cabinet to maintain operating temperatures within the 0 to 60 degC range.

FAQ

Q: Does this module require a specific terminal block?
A: Yes, the 1756-OB16IF requires a 36-pin Removable Terminal Block (RTB). Compatible models include the 1756-TBCH (deep cage clamp) and 1756-TBS6H (spring clamp).

Q: Can I use different voltages on the same module?
A: Yes, because the 16 channels are individually isolated, you can connect independent DC power sources to different points on the same module without common-tie interference.

Q: What is the default state of the outputs during a fault?
A: The module is configured to default to the OFF state during a fault, though this can be programmed to Hold Last State or ON depending on your application requirements.