Allen Bradley 1756-OB16IS ControlLogix 16-Point Isolated Output Module

Product Overview

The Allen Bradley 1756-OB16IS functions as a high-reliability digital output module within the ControlLogix® 1756 platform. This module provides 16 sourcing outputs, each featuring individual point-to-point isolation. This specialized architecture prevents electrical noise or faults in one field circuit from affecting adjacent channels or the backplane. It excels in applications requiring disparate power sources or high-integrity signal separation. We supply this component as 100% brand new and original, ensuring your safety-critical and high-availability systems operate with genuine manufacturer-spec components.

Technical Specifications

The 1756-OB16IS utilizes an isolated sourcing configuration to manage 24V DC field loads:

Engineering Advantages

• Point-to-Point Isolation: The 1756-OB16IS provides 250V continuous isolation between every output channel. This allows engineers to mix different voltage sources (within the DC range) on a single module and ensures that a short circuit in one field device remains localized.

• Diagnostic Accuracy: Each channel includes a dedicated front-panel LED to indicate output status. This visual feedback, combined with the module's robust internal diagnostics, streamlines troubleshooting during commissioning and routine maintenance.

• High Output Current Capacity: With a 1.0 A rating per point (up to 30°C), this module directly drives larger DC solenoids, contactors, and actuators without the need for interposing relays, reducing cabinet complexity and failure points.

• Configurable Fault States: Engineers program the module to hold the last state or transition to a specific "On" or "Off" value during a loss of communication. This ensures the machine defaults to a known safe state during network interruptions.

• Rugged ControlLogix Architecture: The module supports "Removal and Insertion Under Power" (RIUP), allowing for hot-swapping during active system operation. This feature minimizes downtime by permitting hardware replacement without powering down the entire chassis.

FAQs

• What is the difference between the 1756-OB16IS and a standard 1756-OB16I?

  The "S" in 1756-OB16IS designates scheduled output capability, allowing for precise time-based synchronization of outputs when used with a CIP Sync compatible system. Both provide isolation, but the "S" model is required for high-precision time-stamping and motion-integrated logic.

• Is this a brand new Allen Bradley original unit?

  Absolutely. We guarantee that every 1756-OB16IS unit we ship is 100% brand new in its original, factory-sealed Allen Bradley packaging. It meets all E-E-A-T industrial procurement standards.

• Which Removable Terminal Block (RTB) does this module require?

  The module requires either the 1756-TBNH (NEMA screw) or 1756-TBSH (spring clamp) 20-pin terminal block. Please note that the RTB is sold separately and is not included with the module itself.

• Can I use different power supplies for different points on this module?

  Yes. Because every channel is isolated from the others, you can wire different DC power sources to individual points or groups of points, provided each source remains within the 10–30V DC operating range.