When Downtime Isn’t an Option: The 1756-OA16IK Story
Plant floors have changed. Where relay panels once clicked through every start and stop, modern process lines now demand dense, isolated switching that survives heat, vibration, and the occasional washdown. The Allen-Bradley 1756-OA16IK was built for exactly that shift. As a ControlLogix isolated AC output module, it packs 16 individually isolated outputs into a single slot, letting you drive AC loads directly without external interposing relays on every point.
What the 1756-OA16IK Actually Does
This module belongs to the Rockwell Automation ControlLogix series and carries the Allen-Bradley brand. It is an isolated AC output module rated for a 120-240 Volts AC voltage class, with an operating voltage range of 74-265 Volts AC. The 16 outputs are individually isolated, which matters when you are mixing circuits that must not share a common reference. Isolation voltage is rated at 50 Volts continuous. The module ships conformally coated, giving the circuitry a protective layer against moisture, dust, and airborne contaminants common in oil, gas, and heavy industrial settings.
Technical Specifications
| Specification | Value |
|---|---|
| Series | ControlLogix |
| Module Type | Isolated AC Output Module |
| Outputs | 16 Points Individually Isolated |
| Voltage | 120-240 Volts AC |
| Operating Voltage Range | 74-265 Volts AC |
| Isolation Voltage | 50 Volts Continuous |
| Power Dissipation (Max) | 5.5 Watts at 60 degrees Celsius |
| Backplane Current at 5 Volts | 300 milliamps |
| Backplane Current at 24 Volts | 3 milliamps |
| Removable Terminal Blocks | 1756-TBCH, 1756-TBS6H |
Where It Earns Its Keep
In upstream oil and gas, this module suits wellhead control panels where AC solenoids and pilot valves must switch independently. Each isolated point keeps a fault on one circuit from dragging down its neighbors, which protects both the process and the ControlLogix chassis.
In water treatment and pipeline pump stations, the 74-265 Volts AC range covers the wide voltage swings that come with long feeder runs. The conformal coating adds a layer of resilience in humid or coastal installations.
For retrofit projects, the 1756-OA16IK is a practical replacement path when older AC output cards reach end of service. The 36-pin terminal interface and removable block options keep wiring changes manageable during a scheduled outage.
Integration and Setup Notes
The module slots into a ControlLogix chassis and draws 300 milliamps from the 5 Volt backplane and 3 milliamps from the 24 Volt backplane. Plan your power budget accordingly. Removable terminal blocks 1756-TBCH and 1756-TBS6H simplify field wiring and let you pre-terminate before swapping hardware.
Because the outputs are individually isolated, verify each field circuit’s voltage and return path before commissioning. Keep wiring separated from low-level analog signals to reduce noise coupling. If you are tying this module into a larger network architecture, confirm gateway and cable requirements with your supplier.
Maintenance and Long-Term Reliability
Inspect terminal connections periodically for looseness and heat discoloration. Keep the chassis airflow path clear, since the module dissipates up to 5.5 Watts at 60 degrees Celsius. In dirty environments, check that the conformal coating remains intact and follow your facility’s standard cleaning and inspection schedule. Please verify current lifecycle status and availability with Oil AutoTech before ordering.
Choosing the Right Output Module
Before you commit, confirm your field device voltage falls within 74-265 Volts AC and that your point count matches the 16 available outputs. Decide whether you need the 1756-TBCH or 1756-TBS6H terminal block for your wiring style. Oil AutoTech offers hands-on technical selection help and fast dispatch, worldwide, so you can get spares when you need them. Contact Oil AutoTech today for pricing and availability.
