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Brand: Allen-Bradley
Allen-Bradley 1756-OA16 ControlLogix 16-Point AC Output Module
Description
Triac outputs for 120/240 V AC loads
The Allen-Bradley 1756-OA16 switches sixteen 120/240 V AC loads with solid-state outputs, with a 74 to 265 V AC operating range. It is used for AC solenoids, small contactor coils, indicator lamps and heater contactors that are still wired at mains voltage in many existing Gulf plants.
Each group of eight points is mechanically fused, so a shorted load clears the group fuse rather than damaging the module. The maximum load is 0.5 A per point, 2 A per group and 4 A per module at 60 C, which is small compared with a relay module and is the main thing to check.
Technical specifications
| Parameter | Specification |
|---|---|
| Catalog number | 1756-OA16 (1756-OA16K conformal coated listed separately) |
| Outputs | 16, mechanically fused per group (8 points per group) |
| Voltage category | 120/240 V AC 50/60 Hz |
| Operating voltage range | 74 to 265 V AC, 47 to 63 Hz |
| Current per point / group / module | 0.5 A / 2 A / 4 A at 60 C |
| Surge current per point | 5 A for 43 ms, repeatable every 2 s at 60 C |
| Surge current per group | 15 A for 43 ms, repeatable every 2 s at 60 C |
| On-state voltage drop, max | 1.5 V at 0.5 A |
| Off-state leakage, max | 3 mA per point |
| Load current, min | 10 mA per point |
| Output delay | 9.3 ms at 60 Hz; 11 ms at 50 Hz |
| Commutating voltage | 4 V/us for loads over 50 mA; 0.2 V/us for loads under 50 mA |
| Fusing | 3.15 A, 250 V AC slow blow per group, 1500 A interruption (Littelfuse H2153.15 as printed) |
| Inhibit voltage, max | Zero crossing, 60 V peak |
| Backplane current | 400 mA at 5.1 V DC; 2 mA at 24 V DC (2.1 W) |
| Power dissipation, max | 6.5 W at 60 C (22.17 BTU/hr) |
| Isolation | 250 V continuous basic, output to backplane and group to group |
| Operating temperature | 0 to +60 C |
| Non-operating temperature | -40 to +85 C |
| Vibration / shock | 2 g at 10-500 Hz / 30 g operating, 50 g non-operating |
| Slot width / keying | 1 slot; electronic keying, software configurable |
| Enclosure / wire category | Open-style; wire category 1 |
Understanding the limits
Triac outputs leak up to 3 mA in the off state and need at least 10 mA of load current to latch reliably, so very small pilot lamps or electronic loads may glow or fail to hold. The commutating voltage figures show how fast a reactive load may reverse before the triac misfires. For inductive loads with high inrush the surge ratings of 5 A per point and 15 A per group for 43 ms are the numbers to compare with the coil data.
Ordering notes
The group fuse is a replaceable mechanical part, so keep a few spares of the fuse type printed in the table. If loads are above 0.5 A or must be isolated per point, the 1756-OW16I relay module is the alternative. Confirm the series, K suffix and the terminal block, which is ordered separately. All values come from the manufacturer technical data and should be confirmed against your load schedule.
Documents and quotation
The linked Rockwell Automation technical data covers the full 1756 I/O range (file size about 15 MB, hosted by Rockwell Automation). Related PLC hardware sits in the PLC & I/O Cards category. Send the catalog number and quantity to Seven Star LLC, an independent supplier in Muscat, for a quotation.
Datasheets & Documents
- Technical data Rockwell Automation 1756 ControlLogix I/O Specifications, publication 1756-TD002U (September 2026) Download
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About brand
Allen-Bradley is the brand of Rockwell Automation for industrial control: ControlLogix and CompactLogix controllers, I/O systems, PanelView operator terminals, PowerFlex drives, motor control and industrial network equipment. The company began in Milwaukee in 1903, when Lynde Bradley and Dr. Stanton Allen formed the Compression Rheostat Company to make the motor speed controller Bradley had invented in 1901. It took the name Allen-Bradley in 1909 and was bought by Rockwell International in 1985. Since 2001 its owner has been Rockwell Automation, which is still headquartered in Milwaukee, Wisconsin.
Allen-Bradley company profile
| Founded | 1903, Milwaukee, Wisconsin, USA, as the Compression Rheostat Company |
|---|---|
| Founders | Lynde Bradley (inventor of the compression rheostat, 1901) and Dr. Stanton Allen (investor); Harry Bradley joined in 1904 |
| Name | Allen-Bradley Company from 1909 |
| Ownership | Acquired by Rockwell International in 1985 for about USD 1.65 billion; a brand of Rockwell Automation (NYSE: ROK) since 2001 |
| Headquarters | Milwaukee, Wisconsin, USA |
| Product families | Logix programmable automation controllers (ControlLogix, CompactLogix), legacy SLC 500 and MicroLogix PLCs, Micro800 controllers, POINT, FLEX and Compact I/O, PanelView HMIs, PowerFlex AC drives, contactors, motor starters and soft starters, safety components, Stratix Ethernet switches |
Milestones
- 1901: Lynde Bradley invents the compression rheostat to control the speed of electric motors.
- 1903: The Compression Rheostat Company is formed in Milwaukee with an initial investment of USD 1,000.
- 1904: Harry Bradley joins; a crane controller is shown at the St. Louis World's Fair.
- 1909: The company is renamed Allen-Bradley.
- 1985: Rockwell International acquires Allen-Bradley.
- 2001: Rockwell Automation becomes the company's name; the Allen-Bradley brand marks 100 years in 2003.
Reading Allen-Bradley catalogue numbers
The first digits of an Allen-Bradley catalogue number identify the platform, which tells you what is compatible with what. 1756 is ControlLogix (chassis-based, used for large process and plant control), 1769 is CompactLogix 5370 with Compact I/O, 5069 is CompactLogix 5380 with Compact 5000 I/O, 1734 is POINT I/O, 1794 and 5094 are FLEX and FLEX 5000 distributed I/O, 1746 and 1747 belong to the older SLC 500 family, 1766 is MicroLogix 1400 and 2080 is Micro800. For drives, 25B is PowerFlex 525 and 22B is PowerFlex 40; in a code such as 25B-D010N114, "D" means 380–480 V, "010" is the output current rating, and N114 instead of N104 means the drive has an integrated EMC filter. Many plants in the region still run SLC 500 and older MicroLogix systems, which Rockwell has discontinued, so exact spares and migration to CompactLogix are both common requests.
Where Allen-Bradley products are used
In Oman and the GCC, Allen-Bradley controllers and drives run on oil and gas facilities, water treatment and pumping stations, cement, food and beverage and packaging plants, and on machines supplied by American OEMs. ControlLogix is often the platform for plant control systems, while PowerFlex drives are used on pumps, fans and conveyors.
Allen-Bradley products we list
| Family | Examples |
|---|---|
| ControlLogix | 1756-L85E, 1756-EN2T, 1756-EN2TR, 1756-IF16, 1756-IB32, 1756-PA75, 1756-A10 |
| CompactLogix and Micro controllers | 5069-L320ER, 5069-L340ERM, 1769-L33ER, 1769-L16ER, MicroLogix 1400, Micro820, SLC 500 (1746) |
| Distributed I/O | 1734-AENTR, 1734-IB8, 1734-IE2C, 1734-IB8S safety, 1794-AENTR, 5094-AENTR, 5069-IF8 |
| Operator terminals | PanelView Plus 7 10-inch, PanelView Plus 7 15-inch, PanelView 800, PanelView 5310 |
| Drives, motor control and networking | PowerFlex 525, PowerFlex 755, PowerFlex 4, 150-A180NBD SMC, Stratix 2000, 1783-NATR |
Ordering Allen-Bradley products: what we need
Send the full catalogue number and the series letter from the label (for example 1756-EN2T Series D), because firmware and compatibility can change between series. For drives, add the motor power, voltage and filter option. For a discontinued SLC 500 or MicroLogix part, tell us whether you need the exact spare or a migration proposal.
Facts checked against Rockwell Automation's published company history, October 2026.
Browse Allen-Bradley products by category: PLC & I/O Cards, AC Drives.
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Frequently Asked Questions
What voltage does the 1756-OA16 switch?
120/240 V AC, 74 to 265 V AC at 47 to 63 Hz.
What is the maximum current?
0.5 A per point, 2 A per group and 4 A per module at 60 C.
How are outputs protected?
Each group of eight is mechanically fused with a 3.15 A slow-blow fuse.
What is the minimum load?
10 mA per point.
What is the output leakage?
Up to 3 mA per point in the off state.
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