Allen-Bradley 1756-OA16I

Technical specifications

Manufacturer

Allen-Bradley

Manufacturer part no.

1756-OA16I

Type

Digital output module

Application

I/O module

Used with

ControlLogix 1756 chassis

Outputs

16 individually isolated

Pilot duty

Yes

Voltage category

120/240V AC 50/60 Hz

Operating voltage range

74…265V AC 47…63 Hz

Output delay time

9.3 ms @ 60 Hz 11 ms @ 50 Hz 9.3 ms @ 60 Hz 11 ms @ 50 Hz

Current draw @ 5.1V

300 mA

Current draw @ 24V

2.5 mA

Total backplane power

1.59 W

Power dissipation, max

5.5 W @ 60 °C (140 °F)

Thermal dissipation

18.76 BTU/hr

Off-state leakage current, max

3 mA per point

On-state voltage drop, max

1.5V peak @ 2 A 6V peak @ load current < 50 mA

Current per point, max

2 A @ 30 °C (86 °F) linear derating 1 A @ 60 °C (140 °F) linear derating

Current per module, max

5 A @ 30 °C (86 °F) linear derating 4 A @ 60 °C (140 °F) linear derating

Surge current per point

20 A for 43 ms per point, repeatable every 2 s @ 60 °C (140 °F)

Load current, min

10 mA per point

Commutating voltage

4V/µs for loads > 50 mA 0.2V/µs for loads < 50 mA

Scheduled outputs

Synchronization within 16.7 s max, reference to the Coordinated System Time

States in Fault mode per point

Hold last state, On or Off (Off is default)

Isolation voltage

250V (continuous), basic insulation type, outputs-to-backplane, and output-to-output

Inhibit voltage, max

Zero crossing 60V peak

Module keying

Electronic, software configurable

Fusing

Not protected. A fused IFM is recommended to help protect outputs

RTB keying

User-defined mechanical

Slot width

1

Technical documents (1)

• Rockwell Automation technical data 1756-TD002

Key features

• 16 individually isolated outputs with pilot duty rating
• Operating voltage range of 74 to 265V AC at 47 to 63 Hz
• Fault mode per point: hold last state, On or Off, Off by default
• Electronic keying, software configurable, with user-defined mechanical RTB keying
• Scheduled outputs referenced to the Coordinated System Time

About the Allen-Bradley 1756-OA16I

The 1756-OA16I is a ControlLogix 74-265 VAC isolated output module with 16 points and a 36 pin connector. Each output is individually isolated, with an operating range of 74 to 265V AC at 47 to 63 Hz. Current is 2 A per point at 30 °C, derating linearly to 1 A at 60 °C, and 5 A per module at 30 °C, derating to 4 A at 60 °C. It is 1 slot wide.

What is the 1756-OA16I used for?

It switches AC loads in the 120/240V AC 50/60 Hz category where each output needs its own isolated circuit. Isolation is 250V continuous, basic insulation, between outputs and backplane and from output to output. The outputs are not protected, so a fused IFM is recommended to help protect them.

Lifecycle and successor

Active (Rockwell Automation lifecycle status, checked 24 October 2026).

Before you order

What to photograph or confirm so the right unit is quoted.

Read the catalog number 1756-OA16I, the series letter and the firmware revision from the label. Send us a photo of the label and we confirm the match before we quote.