What Makes the 1756-OF8IK the Right Fit for Your ControlLogix System?
How do you deliver precise current signals to field devices when your process runs around the clock in a harsh plant environment? The Allen-Bradley 1756-OF8IK answers that challenge. This ControlLogix isolated analog output module provides 8 current outputs with a selectable 0-20 or 4-20 milliamps range, giving you clean, reliable signals for valves, positioners, and other current-driven actuators.
Manufactured by Rockwell Automation and part of the trusted ControlLogix series, the 1756-OF8IK is built for practical, day-to-day industrial use. Its conformal coating helps it stand up to demanding conditions, making it a smart choice for oil, gas, and general automation applications where uptime matters.
Key Parameters at a Glance
| Specification | Value |
|---|---|
| Output Range | 0-20 or 4-20 milliamps |
| Output Voltage Range | 5-30 Volts DC |
| Current Draw (24 Volts DC) | 400 milliamps |
| Power Dissipation | 6.5 Watts |
| Resolution | 15 bits |
| Isolation Voltage | 50 Volts Continuous |
| Removable Terminal Blocks | 1756-TBNH, 1756-TBSH |
| Enclosure | None |
The 0-20 or 4-20 milliamps output range covers the most common current-loop control signals in modern plants. A 15-bit resolution gives you fine control granularity, so your final control elements receive smooth, accurate commands. The 50 Volts continuous isolation voltage helps protect your I/O chassis from field-side disturbances, while the 400 milliamps current draw at 24 Volts DC helps you plan backplane loading accurately.
Where the 1756-OF8IK Earns Its Keep
Oil and Gas Process Control
In upstream and midstream operations, analog output modules drive control valves and positioners that regulate flow, pressure, and level. The 1756-OF8IK’s isolated current outputs help maintain signal integrity over long cable runs, and its conformal coating supports reliability in humid or contaminated areas.
Industrial Automation and Skids
Packaged skids and OEM machinery often need multiple analog outputs in a compact footprint. With 8 current outputs in a single module, the 1756-OF8IK reduces the number of cards you need, which simplifies your ControlLogix chassis layout and lowers overall system cost.
Replacement and Upgrade Projects
When an aging analog output card begins to drift or fail, downtime costs climb quickly. Keeping a ready-to-ship spare like the 1756-OF8IK on hand lets you swap the module and restore production fast. That is where Oil AutoTech helps — we focus on fast dispatch for oil, gas, and industrial automation spares, with quick worldwide delivery.
Installation and Setup Notes
The 1756-OF8IK installs in a standard ControlLogix chassis and uses removable terminal blocks. The data lists two compatible options: 1756-TBNH and 1756-TBSH. Confirm which terminal block your application requires before ordering, since the module itself ships without an enclosure.
For wiring, the recommended wire size is 22 to 14 AWG solid or stranded shielded copper wire rated for 90 degrees Celsius or greater. Use shielded cable to help preserve signal quality in electrically noisy plants. Always follow the manufacturer’s installation manual for chassis placement, grounding, and terminal block keying.
Reliability and Maintenance
Because the module is conformally coated, it resists the moisture, dust, and chemical exposure common in process environments. Schedule periodic inspections of terminal connections and cabinet cooling. Look for loose wiring, heat buildup, or contamination on the card. Addressing these early helps prevent unplanned outages and protects your investment.
Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Choosing the Right Module
Before you buy, confirm your output type, range, and channel count match your application. The 1756-OF8IK delivers 8 current outputs with a 0-20 or 4-20 milliamps range and a 5-30 Volts DC output voltage range. If you need hands-on technical selection help, our team can guide you to the right ControlLogix module for your system.
Contact Oil AutoTech today for pricing and availability.
