Allen-Bradley 1794-OF4IXT – 4-Channel Analog Output Module | FLEX I/O XT Extended Temperature Series
Engineering Background
The Allen-Bradley 1794-OF4IXT is part of Rockwell Automation’s FLEX I/O XT platform — a ruggedized, distributed I/O architecture engineered for harsh industrial environments where standard FLEX I/O cannot meet thermal or vibration demands. The XT (Extended Temperature) designation certifies operation across a wider ambient temperature range, making this module the preferred choice for outdoor enclosures, foundry floors, and process plants with extreme thermal cycling.
Product Positioning
Designed for procurement engineers specifying distributed analog control in ControlLogix, CompactLogix, and FlexLogix architectures, the 1794-OF4IXT delivers four independently configurable analog output channels with high-resolution DAC performance. It integrates natively into the FLEX I/O backplane via the 1794-TB3 or 1794-TB3S terminal base, enabling modular, scalable panel design without dedicated analog sub-racks.
Complete Technical Specifications
- Catalog Number: 1794-OF4IXT
- Series: FLEX I/O XT (Extended Temperature)
- Manufacturer: Allen-Bradley / Rockwell Automation
- Module Type: Analog Output
- Number of Output Channels: 4 (independently configurable)
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Output Signal Ranges:
- Voltage: 0–10 V DC, ±10 V DC
- Current: 0–20 mA, 4–20 mA
- Resolution: 16-bit DAC (65,535 counts)
- Output Accuracy: ±0.1% of full scale at 25 °C
- Update Rate: Configurable per channel; typical <1 ms per channel
- Operating Temperature: −25 °C to +70 °C (XT rating)
- Storage Temperature: −40 °C to +85 °C
- Relative Humidity: 5–95% non-condensing
- Backplane Current Draw: 75 mA @ 5 V DC (from adapter)
- External Power: 24 V DC ±10% (user-supplied field power)
- Terminal Base Required: 1794-TB3, 1794-TB3S, or 1794-TB3G
- Communication: Via FLEX I/O adapter (DeviceNet, EtherNet/IP, ControlNet, PROFIBUS, etc.)
- Isolation: Channel-to-backplane isolation provided
- Short-Circuit Protection: Yes (current-limited outputs)
- Certifications: UL, CE, C-Tick, ATEX (refer to current product certifications sheet)
- Dimensions (H × W × D): 94 mm × 30 mm × 54 mm (module only)
- Weight: Approx. 1,100 g (packaged)
- Enclosure Rating: Open-style (requires enclosure)
Proven Application Environments
- Oil & Gas: Wellhead control panels, compressor skids, and pipeline SCADA nodes requiring extended temperature operation
- Metals & Mining: Furnace control, conveyor drive reference signals, and smelter automation where ambient temperatures exceed standard module ratings
- Water & Wastewater: Outdoor pump station control, valve positioner outputs, and chemical dosing systems
- Automotive Manufacturing: Paint booth environmental control, press line analog setpoints, and robotic cell I/O distribution
- Food & Beverage: CIP/SIP process control, temperature-regulated conveyor drives, and filling line analog references
- Power Generation: Turbine control auxiliary panels, substation RTU expansion, and generator excitation reference outputs
Engineering Advantages
- Extended Temperature Certification: −25 °C to +70 °C operating range eliminates the need for panel air conditioning in many outdoor or high-ambient installations, reducing CAPEX and maintenance burden.
- 16-Bit Resolution: Fine-grained analog output control supports precision valve positioning, variable-speed drive references, and closed-loop PID setpoints without signal quantization artifacts.
- Independent Channel Configuration: Each of the four channels can be independently set to voltage or current mode, eliminating the need for separate voltage-output and current-output modules in mixed-signal panels.
- Native Rockwell Integration: Full Studio 5000 / RSLogix 5000 Add-On Profile (AOP) support enables drag-and-drop I/O configuration, automatic tag generation, and online diagnostics without custom programming.
- Modular FLEX I/O Architecture: Hot-swap capable terminal base design allows module replacement without rewiring field cables, minimizing planned maintenance downtime.
- Diagnostics & Fault Reporting: Per-channel open-wire detection, out-of-range alarms, and communication fault states are reported directly to the controller tag database for HMI alarming.
System Architecture & Signal Flow
The 1794-OF4IXT mounts onto a compatible 1794-TB3 terminal base, which provides both the backplane electrical connection and the field wiring termination points. The FLEX I/O adapter (e.g., 1794-AENT for EtherNet/IP) communicates with the ControlLogix or CompactLogix controller over the selected network. The controller writes analog output values to the module’s output image table; the module’s 16-bit DAC converts these digital values to the configured analog signal range (0–10 V, ±10 V, 0–20 mA, or 4–20 mA) and drives the field device — typically a control valve, VFD speed reference, or positioner.
Field power (24 V DC) is supplied separately to the terminal base to power the output circuits, ensuring that a backplane power loss does not inadvertently drive field devices to an undefined state.
Sourcing & Quality Verification
- Stock Origin: Verified surplus and authorized-channel inventory; no counterfeit or grey-market sourcing.
- Inspection Protocol: Each unit undergoes visual inspection, label verification (catalog number, series, firmware revision), and functional power-on check prior to shipment.
- Packaging: Anti-static bag + foam-lined carton; original Rockwell packaging preserved where available.
- Warranty: 12-month Konmask operational warranty covering manufacturing defects and DOA units.
- Documentation: Installation Instructions (Pub. 1794-IN009), User Manual (Pub. 1794-UM001), and current firmware release notes available upon request.
- Traceability: Lot and serial number records maintained for all shipped units; available for audit on request.
Procurement Process
- Step 1 — Inquiry: Submit your BOM line or catalog number via the product page, email support@konmask.com, or WhatsApp/WeChat at +0086 19859288691.
- Step 2 — Quote: Receive a formal quotation with unit price (HKD/USD), lead time, and available quantity within 2 business hours.
- Step 3 — Order Confirmation: Issue a Purchase Order or confirm via email. Proforma invoice issued immediately.
- Step 4 — Payment: T/T bank transfer, PayPal, or other agreed terms. Payment confirmation triggers pick-and-pack.
- Step 5 — Shipment: DHL / FedEx / SF Express with full tracking. Export documentation (commercial invoice, packing list, COO) included.
- Step 6 — After-Sales: Technical support and warranty claims handled directly by Konmask engineering team.
Technical FAQ
Q: What is the difference between 1794-OF4I and 1794-OF4IXT?
A: The 1794-OF4IXT is the Extended Temperature variant rated to −25 °C to +70 °C, versus the standard 1794-OF4I rated to 0 °C to +55 °C. Electrically and functionally identical; the XT suffix denotes the wider thermal certification only.
Q: Can I mix 1794-OF4IXT with standard FLEX I/O modules on the same adapter?
A: Yes. XT and standard FLEX I/O modules share the same backplane and adapter architecture. However, the overall system thermal rating is limited by the lowest-rated module installed.
Q: Which terminal base is required?
A: The 1794-TB3 (3-wire) or 1794-TB3S (spring-clamp) terminal base is required. The terminal base is ordered separately and is not included with the module.
Q: Is the module compatible with Studio 5000 Logix Designer?
A: Yes. Full AOP support is available. The module appears in the I/O tree as a standard FLEX I/O analog output module with auto-generated controller tags.
Q: What happens to outputs on communication loss?
A: Each channel can be configured for a programmable fault state (hold last value, go to a preset value, or ramp to zero) via the module’s configuration parameters in Studio 5000.
Q: Do you provide a Certificate of Conformance?
A: Yes. A Konmask Certificate of Conformance is available for all shipped units. Rockwell Automation factory CoC is available for new/sealed stock where applicable.
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