1756-OF8 Rockwell Automation 15-Bit Analog Output Unit

Availability: 20 left in stock

Product Overview The Allen-Bradley 1756-OF8 stands as a cornerstone for precision signal delivery within the ControlLogix ecosystem. This high-density module provides eight...

SKU: 1756-0F8

Manufacturer: Allen Bradley
Product No.: 1756-0F8
Product Type: Analog Output Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 600g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen-Bradley 1756-OF8 stands as a cornerstone for precision signal delivery within the ControlLogix ecosystem. This high-density module provides eight individually configurable outputs, allowing engineers to drive actuators, control valves, and variable frequency drives (VFDs) with exceptional accuracy. By supporting both ±10V voltage and 0–20 mA current loops, the 1756-OF8 simplifies inventory and design by handling diverse field device requirements within a single chassis slot.

Condition Statement: We supply this 1756-OF8 in 100% Brand New, Factory Sealed condition, ensuring maximum reliability and the full integrity of its internal R-Ladder DAC architecture.

Technical Specifications

The 1756-OF8 utilizes a monotonic R-Ladder Digital-to-Analog Converter (DAC) to eliminate missing codes and ensure smooth signal transitions.

Feature	Details
Output Channels	8 Voltage or Current (individually configurable)
Output Ranges	±10.4V DC, 0–21 mA, 4–20 mA
Resolution	15-bit (320 µV/bit or 650 nA/bit)
Settling Time	< 2 ms to 95% of final value (resistive loads)
Calibrated Accuracy	Better than 0.05% of range @ 25°C
Isolation Voltage	250V continuous (Channels-to-Backplane)
Backplane Current	150 mA @ 5.1V DC / 210 mA @ 24V DC
Drive Capability	>2000 Ω (Voltage); 0–750 Ω (Current)
Protection	Short-circuit (≤21 mA) and 24V Overvoltage
RTB Options	1756-TBNH or 1756-TBSH

Engineering Advantages

The 1756-OF8 addresses critical industrial pain points through high-performance circuitry and robust hardware design:

Eliminate Signal Lag: The module achieves a settling time of less than 2 ms. This fast response enables high-speed PID loops to stabilize quicker, significantly improving the performance of dynamic motion and flow control applications.
Precision Actuation: 15-bit resolution provides the fine-grained control necessary for sensitive dosing pumps and precision positioning valves, minimizing process variability.
Built-in Loop Diagnostics: The 1756-OF8 includes open-circuit detection for current outputs. If a wire breaks or a device fails, the module immediately flags the error to the controller, reducing troubleshooting downtime.
Thermal Efficiency: Despite its high density, the module manages power dissipation effectively (as low as 3.15 W depending on load), preventing heat buildup within the ControlLogix chassis and extending the life of adjacent modules.

FAQs

Can I mix voltage and current outputs on the same module?

Yes. The 1756-OF8 allows you to configure each of the eight channels independently via Studio 5000 software. You can drive a 4-20 mA valve on Channel 0 and a 0-10V VFD reference on Channel 1 simultaneously.
Does the 1756-OF8 require external power?

While the module draws 210 mA at 24V DC from the ControlLogix backplane, the actual field-side signals are powered through the chassis. Ensure your 1756 power supply has sufficient capacity for the combined current draw of all installed modules.
How often should I calibrate the 1756-OF8?

Rockwell Automation recommends a typical calibration interval of 12 months to maintain the 0.05% accuracy specification, especially in environments with significant temperature fluctuations.
What is the difference between Series A and Series B?

Series A is the original design. While newer series may offer minor component updates or firmware enhancements, the core technical specs like the 2 ms settling time and 15-bit resolution remain compatible for drop-in replacements.

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.