1756-ON8 Allen Bradley Rockwell Digital AC Output Module

Product parameters

Product Model: 1756-ON8

Type: Digital AC Output Module (AC Digital Output)

Output points: 8, divided into 2 groups (4 points in each group)

Output voltage range: 10-30V AC, 47-63 Hz

Nominal voltage: 24V AC

Output current:

Each point: 2 A @ 60°C

Each group: 5 A @ 30°C, 4 A @ 60°C (linear derating)

Total module: 5 A @ 30°C, 4 A @ 60°C

Surge current: 20 A per point, lasting for 43 ms (repeatable every 2 seconds, @60 °C)

Minimum load current: 50 mA per point

Maximum off-state leakage current: 3 mA per point

Voltage drop in the conduction state: Up to 1.5V AC @ 2 A

Power dissipation: Maximum 5.1W at 60°C

Heat dissipation: 17.39 BTU/hr at 60°C

Output delay time:

OFF to ON: 9.3 ms @ 60 Hz, 11 ms @ 50 Hz

ON to OFF: 9.3 ms @ 60 Hz, 11 ms @ 50 Hz

Isolation voltage:

Channel to backplane: 250V (continuous), basically insulated, test voltage 1350V AC, lasting for 2 seconds

Inter-group isolation: 250V (continuous), test voltage 1350V AC, for 2 seconds

There is no isolation between channels (within the same group)

Wire size:

1756-TBNH: 0.33-2.1 mm² (22-14 AWG, single line), 0.33-1.3 mm² (22-16 AWG, Double line)

1756-TBSH: 0.33-1.3 mm² (22-16 AWG, single line)

Connector: 20-pin removable terminal block (RTB, such as 1756-TBNH or 1756-TBSH)

Operating temperature range: 0-60°C (32-140°F)

Storage temperature range: -40 to 85°C (-40 to 185°F)

Working humidity: 5-95% (no condensation)

Impact rating: 30G (in operation), 50G (not in operation)

Vibration level: 2G @ 10-500 Hz

Installation method: Install on ControlLogix racks (compatible with 1756-A4, A7, A10, A13, A17)

Certifications: CE, CSA, UL, FM, IECEx, ATEX, RCM, KC, EAC (as of June 2025)

Temperature code: T4 (North American and ATEX standards)

Shell type: Open Enclosure

UPC: 612598171385

Function

Low-voltage AC output

It provides 8 AC output channels (2 groups, 4 points in each group), supporting 10-30V AC, and is specially designed for 24V AC loads, such as low-voltage relays, solenoid valves or indicator lights.

Each point supports A current of 2 A, and the total current of the module can reach up to 5 A (at 30°C) or 4 A (at 60°C).

Flexible status control

Supports Fault Mode and Program Mode at each point, which can be configured to remain in the final state (ON or OFF), with the default being OFF.

Support Scheduled Outputs with a synchronization time of up to 16.7 seconds to ensure precise control.

Diagnosis and Monitoring

The LED indicator light shows the output status, communication status and module health status, facilitating on-site diagnosis.

No electronic fuse or advanced diagnostic functions (such as open circuit/short circuit detection of 1756-OA8D).

Network integration

Communicate with the ControlLogix controller via ControlNet or EtherNet/IP network, supporting local or distributed I/O architecture.

Supports hot plugging (RIUP), which is convenient for maintenance and replacement.

Software configuration:

Configured using the Studio 5000 Logix Designer software, it supports point-level configuration, communication formats (rack optimization, direct connection, scheduling output), and Add-On Profiles (AOP).

No internal fuse:

The module does not have an internal fuse. It is recommended to install an external fuse to protect the module. The size of the fuse should be selected based on a current of 2A at each point.

Application scenarios

Industrial automation control

Control low-voltage AC equipment in the production line, such as 24V AC relays, solenoid valves, indicator lights or small actuators.

Suitable for manufacturing, packaging or material handling systems.

Process control

In water treatment, HVAC or light industry, drive 24V AC loads, such as small pumps or valves.

High inrush current support (20 A, 43 ms) is suitable for starting high-impact loads.

Distributed control system: It is integrated into large-scale factory automation systems as a remote I/O component through ControlNet or EtherNet/IP networks.

Cost-sensitive scenarios: Compared with 1756-OA8E (with electronic fuse) or 1756-OA8D (with diagnosis), 1756-ON8 has a lower cost and is suitable for simple, low-voltage AC load control.

Low-voltage equipment control: Suitable for controlling 24V AC alarms, buzzers or contactors, and widely used in factory automation.

Advantage Products:

All items are Distributor Ready-stock Genuine Brand-new Supplying, please inform us if the other conditions are needed, Used, Open-box, Refurbished, etc.

Many Available just wait for you, feel free to ask to get better deal!!!

Bou L(Sales Manager)            

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