Genuine Allen-Bradley 1756-OF4 ControlLogix Analog Output Module | Series B – Verified Source
The Allen-Bradley 1756-OF4 is a 4-channel analog output module within Rockwell Automation’s ControlLogix platform — one of the most widely deployed process-control architectures in global manufacturing, oil & gas, water treatment, and power generation. Its precision ±10 VDC / 4–20 mA output capability makes it a critical component in closed-loop control systems where signal integrity is non-negotiable. Due to its long service life and high demand, the 1756-OF4 is frequently targeted by counterfeit and refurbished-as-new listings across grey-market channels, posing serious risks to system stability, safety certifications, and warranty coverage.
Konmask sources the 1756-OF4 exclusively through verified industrial distribution channels and conducts multi-stage incoming inspection on every unit. Each module shipped from Konmask.com is confirmed genuine, traceable, and functionally tested — with documentation available upon request. Our listings consistently use the terms genuine, verified, and authentic because we stand behind every unit with a written quality commitment, not just marketing language.
Technical Specifications
- Part Number: 1756-OF4
- Series: B
- Manufacturer: Allen-Bradley / Rockwell Automation
- Output Channels: 4 (individually configurable)
- Output Signal Types: ±10 VDC (voltage) | 4–20 mA (current)
- Resolution: 16-bit (voltage) | 16-bit (current)
- Output Accuracy: ±0.1% full scale at 25°C
- Update Rate: 1 ms per channel (RPI configurable)
- Backplane Current Draw: 125 mA @ 5 VDC; 3 mA @ 24 VDC
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5–95% non-condensing
- Isolation: 250 VAC continuous, channel-to-backplane
- Dimensions (H × W × D): 94.0 × 94.5 × 58.6 mm
- Weight: ~300 g
- Certifications: UL, CE, C-Tick, FM (Class I Div 2)
- Compatible Chassis: 1756-Axx ControlLogix chassis (all slot counts)
Specifications verified against Allen-Bradley / Rockwell Automation official documentation (Publication 1756-TD001).
Our 4-Step Quality Verification Process
- Step 1 – Visual & Label Authentication: Every unit undergoes physical inspection of the Rockwell Automation holographic label, catalog number silk-screen, PCB revision markings, and connector condition. Counterfeit units frequently show label misalignment, incorrect font weight, or missing revision codes — all checked against OEM reference samples.
- Step 2 – Functional Bench Test: Each module is powered in a live 1756 chassis and tested across all 4 output channels for voltage and current accuracy, linearity, and response time. Test results are logged and available as a Test Report upon request.
- Step 3 – Firmware & Revision Verification: Module firmware version and hardware series are confirmed via RSLogix 5000 / Studio 5000 device properties and cross-referenced against Rockwell’s published revision history to ensure no unauthorized modifications.
- Step 4 – Documentation Package: Shipped with a Certificate of Conformance (COC), Packing List, Country of Origin (COO) Declaration, and optional third-party Test Report. Photos of the actual unit and packaging are available pre-shipment upon request.
Key Features & Benefits
- Dual-Mode Output Flexibility: Each channel independently configurable for voltage (±10 VDC) or current (4–20 mA), eliminating the need for separate modules in mixed-signal installations — compliant with IEC 61131-2 analog output interface standards.
- 16-Bit Resolution: Delivers 65,536 discrete output steps per channel, enabling fine-grained process control in applications requiring sub-0.1% setpoint accuracy.
- 1 ms Per-Channel Update Rate: Supports high-speed closed-loop control loops with deterministic RPI scheduling via the ControlLogix backplane — aligned with IEC 61784-1 fieldbus timing requirements.
- Channel-to-Backplane Isolation (250 VAC): Protects the controller and chassis from field-side voltage transients and ground loops common in industrial environments.
- Fault-State & Hold-Last-State Output: Configurable per channel to drive outputs to a defined safe state or hold last value on controller fault — critical for process safety compliance.
- Hot-Swap Capable: Supports removal and insertion under power (RIUP) within a live ControlLogix chassis, minimizing planned downtime during maintenance windows.
Typical Applications
- Oil & Gas: Valve positioner control (4–20 mA) on wellhead and pipeline pressure regulation skids using Emerson Fisher or Flowserve actuators.
- Water & Wastewater Treatment: Variable-speed drive (VSD) speed reference output for pump stations and aeration blower control in municipal SCADA systems.
- Power Generation: Turbine governor and excitation system analog setpoint output in combined-cycle and hydroelectric plant DCS architectures.
- Automotive Manufacturing: Servo amplifier command signal output for robotic welding and press-line force-control applications on Allen-Bradley ControlLogix-based safety PLCs.
- Chemical & Pharmaceutical: Reactor temperature and flow control via 4–20 mA output to I/P transducers and control valves in FDA-regulated batch processes.
- Food & Beverage: Conveyor speed and filling-line dosing control with ±10 VDC output to frequency inverters in hygienic processing environments.
Compatible System Components
- Chassis: 1756-A4, 1756-A7, 1756-A10, 1756-A13, 1756-A17
- Power Supplies: 1756-PA72, 1756-PB72, 1756-PA75, 1756-PB75
- Controllers: 1756-L61, 1756-L62, 1756-L63, 1756-L71, 1756-L72, 1756-L73, 1756-L74, 1756-L75, 1756-L81E, 1756-L82E, 1756-L83E, 1756-L84E, 1756-L85E
- Communication Modules: 1756-EN2T, 1756-EN2TR, 1756-EN3TR, 1756-ENBT (EtherNet/IP); 1756-DNB (DeviceNet); 1756-CN2 (ControlNet)
- Programming Software: RSLogix 5000 v16+, Studio 5000 Logix Designer v21+
- Wiring Arm: 1756-TBCH (36-pin cage clamp), 1756-TBS6H (spring clamp)
Global Sourcing & Shipping Capabilities
- Primary Service Regions: Mainland China, Hong Kong SAR, Southeast Asia (Vietnam, Thailand, Indonesia, Malaysia), Middle East (UAE, Saudi Arabia), Europe (Germany, Netherlands, Poland), North America (USA, Canada, Mexico)
- Export Packaging Standard: Anti-static ESD bag → foam-lined inner box → double-wall corrugated outer carton with moisture-barrier liner. Fragile/shock-indicator labels applied to all cartons.
- Shipping Options: DHL Express (2–5 business days globally), FedEx International Priority, sea freight LCL/FCL for bulk orders, and China Post registered air mail for budget-sensitive destinations.
- Lead Time: In-stock units ship within 1–2 business days of payment confirmation. Pre-order units: 5–15 business days depending on sourcing channel.
- Export Documentation: Commercial Invoice, Packing List, COO Declaration, and COC provided as standard. CITES, Form E (ASEAN), and EUR.1 certificates available upon request for applicable destinations.
Certifications & Compliance Statement
- ✅ UL Listed – UL 508 Industrial Control Equipment
- ✅ CE Marked – EMC Directive 2014/30/EU; Low Voltage Directive 2014/35/EU
- ✅ C-Tick / RCM – Australian Communications and Media Authority
- ✅ FM Approved – Class I, Division 2, Groups A, B, C, D (Hazardous Locations)
- ✅ RoHS Compliant – Directive 2011/65/EU
Konmask Quality Commitment: All products listed on Konmask.com are sourced from verified industrial supply chains. We do not knowingly list counterfeit, unauthorized reproduction, or end-of-life products misrepresented as new. Every unit is subject to incoming inspection and functional verification before dispatch. If any product fails to meet the specifications stated on this page, Konmask will arrange replacement or full refund within the warranty period — no questions asked.
How to Order
- Submit Your Inquiry: Add to cart directly, or contact us at support@konmask.com with your required quantity, delivery destination, and any special documentation requirements (COC, test report, photos).
- Receive Quotation & Confirmation: Our team responds within 24 hours (business days, UTC+8) with a formal quotation, stock confirmation, and pre-shipment photo/inspection report if requested.
- Payment & Dispatch: Upon payment confirmation, units are packed, documented, and dispatched within 1–2 business days. Tracking number provided immediately upon shipment.
Sample & Test Report Policy: Pre-shipment samples available for qualified buyers on orders above MOQ. Third-party test reports (SGS, BV, or equivalent) can be arranged at buyer’s cost with 5–7 additional business days lead time.
Authenticity & Trust FAQ
- Q: How can I verify that the 1756-OF4 I receive is genuine Allen-Bradley?
- A: Every unit shipped by Konmask includes a Certificate of Conformance (COC) and pre-shipment photos showing the Rockwell Automation holographic label, catalog number, and series marking. You can also verify the module’s firmware version and hardware revision via Studio 5000 after installation. If you have any doubt, we will arrange a third-party inspection before shipment at no additional charge for orders above USD 2,000.
- Q: What is Konmask’s warranty policy for this module?
- A: Konmask provides a 12-month warranty from the date of shipment against manufacturing defects and functional failure under normal operating conditions. Warranty claims are processed within 5 business days of receiving the returned unit. We cover return shipping costs for confirmed defective units. This warranty is in addition to, and does not limit, any applicable statutory consumer rights.
- Q: Can you provide a test report or inspection certificate before I place an order?
- A: Yes. For in-stock units, we can provide a functional test report (channel-by-channel output accuracy log) and pre-shipment photos within 24 hours of your request — at no additional cost. For third-party laboratory test reports (SGS, Bureau Veritas, or equivalent), these can be arranged with 5–7 business days additional lead time. Contact support@konmask.com with your specific requirements.
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