Genuine Allen-Bradley 1756-OF8H Allen-Bradley ControlLogix 1756 - Industrial Automation Part

Allen-Bradley 1756-OF8H Allen-Bradley ControlLogix 1756 - Front Panel and Connectivity View

Allen-Bradley 1756-OF8H ControlLogix 8-Channel Analog Output Module

Description

Allen-Bradley 1756-OF8H 8-Channel Analog Output Module – ControlLogix Series

When a ControlLogix analog output module fails mid-process, the consequences are immediate and costly: actuators freeze, control valves lose their setpoints, and entire production lines grind to a halt. In continuous manufacturing environments — chemical dosing, oil refinery blending, or precision motion control — even a momentary loss of analog output signal can trigger emergency shutdowns, product waste, and unplanned downtime measured in thousands of dollars per hour. The Allen-Bradley 1756-OF8H is the module that keeps those signals alive, accurate, and reliable.

Within the ControlLogix 1756 platform — Rockwell Automation’s flagship modular control architecture — the 1756-OF8H occupies a critical tier: it delivers 8 independently configurable analog output channels with high-resolution signal fidelity, making it the preferred choice for process-intensive applications where output precision directly governs product quality. Globally, the ControlLogix platform powers automation in over 100 countries, and the OF8H variant is a cornerstone module for engineers who demand both channel density and output accuracy in a single backplane slot.

Technical Specifications

Part Number: 1756-OF8H
Series: Allen-Bradley ControlLogix 1756
Output Channels: 8 (independently configurable)
Output Signal Types: Voltage (±10V) and Current (0–20 mA / 4–20 mA)
Resolution: 16-bit
Backplane Communication: ControlLogix backplane (1756 chassis)
Isolation: Channel-to-backplane isolation
Operating Temperature: 0°C to 60°C (32°F to 140°F)
Storage Temperature: -40°C to 85°C
Relative Humidity: 5% to 95% (non-condensing)
Agency Certifications: UL, CE, C-Tick
Form Factor: Single-slot ControlLogix module
Firmware: Updateable via Logix Designer

Note: All specifications are based on published Rockwell Automation documentation. Verify with official datasheets for your specific revision.

Key Features & Benefits

8 Independent Output Channels: Each channel is individually configurable for voltage or current output, eliminating the need for multiple modules in multi-loop control architectures.
16-Bit Resolution: Delivers fine-grained output precision critical for PID loop control, valve positioning, and variable-speed drive setpoints.
Hold Last State on Fault: Configurable fault/program mode behavior ensures actuators maintain safe positions during controller faults, reducing process uptime risk.
Real-Time Diagnostics: Built-in channel-level diagnostics report open-wire, over-range, and under-range conditions directly to the controller tag database.
Hot-Swap Capable: Supports removal and insertion under power (RIUP) within a ControlLogix chassis, enabling maintenance without full system shutdown.
Seamless Studio 5000 Integration: Full Add-On Profile (AOP) support for drag-and-drop configuration in Logix Designer / Studio 5000 environment.
Compact Single-Slot Footprint: Maximizes chassis density in space-constrained control panels.

Industry & Equipment Applications

Oil & Gas: Pipeline pressure regulation, compressor anti-surge control, wellhead valve positioning
Chemical & Petrochemical: Reactor temperature setpoint control, dosing pump speed reference, distillation column reflux ratio management
Water & Wastewater Treatment: Variable-frequency drive (VFD) speed references for pumps and blowers, chemical dosing control
Food & Beverage: Filling machine flow control, oven temperature profiling, conveyor speed regulation
Automotive Manufacturing: Robotic welding current control, paint booth airflow management, press force setpoints
Power Generation: Turbine governor control, boiler feedwater flow regulation, generator excitation control
Pharmaceutical: Bioreactor agitation speed, clean-in-place (CIP) flow control, HVAC damper positioning

System Integration & Compatible Parts

The 1756-OF8H is designed to operate within the broader Allen-Bradley ControlLogix ecosystem. Compatible and commonly paired components include:

Controllers: 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75
Analog Input Counterparts: 1756-IF8, 1756-IF16, 1756-IF8H
Communication Modules: 1756-EN2T, 1756-EN2TR, 1756-EN3TR (EtherNet/IP)
Wiring Systems: 1492-AIFM8-F-5 analog interface modules for field wiring termination

Our Quality Assurance Process

At Konmask.com, every Allen-Bradley module we supply goes through a rigorous multi-stage verification process before shipment:

Authenticity Verification: Visual inspection of Rockwell Automation holographic labels, date codes, and catalog number markings against known-good references.
Functional Pre-Check: Where applicable, modules are bench-tested in a live ControlLogix chassis to confirm backplane communication and channel response.
Condition Grading: Each unit is clearly graded as New (factory-sealed), Refurbished (tested & restored), or Used (tested, cosmetic wear acceptable) — no ambiguity.
ESD-Safe Packaging: All modules are packed in anti-static bags with foam cushioning and clearly labeled for safe international shipping.
Documentation: Test reports and condition certificates available upon request for quality-critical procurement.

How to Order

Submit an Inquiry: Use the contact form or email support@konmask.com with your required quantity, preferred condition (new/refurbished/used), and delivery timeline.
Receive a Quote: Our technical sales team will respond within 1 business day with pricing, availability, and lead time.
Confirm & Pay: We accept T/T (bank transfer), PayPal, and other B2B payment methods. Pro-forma invoice provided upon order confirmation.
Shipping & Tracking: Orders are dispatched via DHL, FedEx, or UPS Express with full tracking. Export documentation (commercial invoice, packing list) included.
After-Sales Support: Our engineering team is available post-delivery for integration questions and warranty claims.

Why Choose Konmask.com?

✅ Specialized in Industrial Automation: We focus exclusively on PLC, DCS, and automation hardware — not a generalist marketplace.
✅ Global B2B Supply: Serving engineering firms, system integrators, and MRO procurement teams across Asia, Europe, the Middle East, and the Americas.
✅ Technical Expertise: Our team includes experienced automation engineers who can advise on compatibility, firmware, and system design.
✅ Competitive Lead Times: Extensive supplier network enables fast sourcing even for discontinued or hard-to-find part numbers.
✅ Transparent Grading: No misleading condition descriptions — every module is graded and documented honestly.
✅ Responsive Communication: Dedicated account managers for B2B clients with multi-unit or recurring procurement needs.

Frequently Asked Questions

Q: Is the 1756-OF8H compatible with all ControlLogix controllers?
A: Yes, the 1756-OF8H is compatible with all ControlLogix 1756-series controllers and can be configured via Studio 5000 Logix Designer. Always verify firmware compatibility with your specific controller revision.

Q: Can the 1756-OF8H output both voltage and current on the same module?
A: Yes. Each of the 8 channels can be independently configured for either voltage (±10V) or current (0–20 mA / 4–20 mA) output, providing maximum flexibility within a single module.

Q: What happens to the outputs if the controller faults?
A: The 1756-OF8H supports configurable fault-mode behavior per channel — outputs can be set to hold last state, go to a user-defined value, or go to zero, depending on your safety requirements.

Q: Do you supply new, refurbished, or used units?
A: We supply all three conditions. Please specify your preference when submitting an inquiry. All units are tested and graded transparently.

Q: Can I get a datasheet or test report before purchasing?
A: Yes. Official Rockwell Automation datasheets and our internal test reports are available upon request. Contact support@konmask.com.

Q: What is the typical lead time?
A: Lead time varies by stock availability. In-stock units typically ship within 2–3 business days. For sourced units, lead time is 5–15 business days. We will confirm at the time of quotation.

Q: Do you offer warranty on the 1756-OF8H?
A: Yes. We offer a 90-day functional warranty on all tested units. Extended warranty options are available for volume orders — please inquire.

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