Allen-Bradley 1756-OB8 ControlLogix 8-Point DC Output Module

Allen-Bradley 1756-OB8 ControlLogix DC Output Module

Availability: 4 left in stock

DescriptionThe 1756-OB8 is a high-integrity direct current (DC) digital source output module engineered for the Allen-Bradley ControlLogix 1756 chassis platform....

SKU: 1756-OB8

Manufacturer: Allen-Bradley
Product No.: 1756-OB8
Product Type: Digital Output Module
Product Origin: USA
Payment:T/T, Western Union
Weight: 450g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Description

The 1756-OB8 is a high-integrity direct current (DC) digital source output module engineered for the Allen-Bradley ControlLogix 1756 chassis platform. This chassis-based I/O component functions as a solid-state electrical control switch, managing up to 8 independent field-side actuator channels. It delivers continuous, low-latency switching control across intensive industrial networks, including chemical processing, water treatment, automotive assembly, and power distribution systems. By routing logic-level system instructions into high-current sourcing circuits, this unit effectively drives external DC field loads—such as solenoids, relays, pilot lamps, and contactor coils—while shielding backplane microprocessors from electrical noise and voltage spikes.

Features

8-point digital DC sourcing output configuration.
Organized into two isolated groups of 4 channels each, allowing for separate field power distribution loops.
Compatible with 1756-TBNH and 1756-TBSH 20-pin Removable Terminal Blocks (RTB).
Supports hot-swappable module replacement to minimize system downtime.
Programmable fault and program mode states (Hold Last State, ON, or OFF).
User-defined mechanical keying to prevent incorrect module insertion.

Applications

The 1756-OB8 is designed for demanding industrial environments requiring reliable DC load switching. Typical applications include:

Automotive manufacturing and assembly lines.
Municipal water and wastewater treatment facilities.
Chemical and petrochemical processing plants.
Power generation and distribution substations.
General machine control and factory automation.

Technical Specifications

Model	1756-OB8
Outputs	8 Points (2 isolated groups of 4)
Voltage Range	10 to 30 VDC
Max Current Per Point	2 A @ 60 deg C
Max Current Per Module	8 A @ 60 deg C
Min Load Current	2 mA per channel
Backplane Power (5.1V)	165 mA
Power Dissipation	2.5 Watts @ 60 deg C
Isolation Voltage	250 V continuous
Operating Temp	0 to 60 deg C

Installation Guidelines

Ensure the ControlLogix chassis is powered down before inserting or removing the module.
Use appropriate mechanical keying on the RTB to prevent incorrect module-to-wiring matches.
Ensure field power supply is within the 10-30 VDC range and properly fused for the connected load.
Maintain proper grounding practices for the chassis to minimize EMI/RFI interference.
Verify that the RTB is securely latched to the module housing to ensure reliable electrical contact.
Keep the module clear of high-heat sources and ensure adequate ventilation within the cabinet.

FAQ

Can I replace the 1756-OB8 while the system is running? Yes, this module supports Removal and Insertion Under Power (RIUP) when installed in a ControlLogix chassis, provided the hazardous area requirements are met.

What is the difference between the 1756-TBNH and 1756-TBSH terminals? The 1756-TBNH is a standard cage clamp terminal block, while the 1756-TBSH is a spring clamp terminal block. Both are compatible with the 1756-OB8.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.