Allen-Bradley 1746-OW8 SLC 500 Digital Contact Output Module

Product Description

The Allen-Bradley 1746-OW8 is a digital contact output module for the SLC 500 programmable logic controller (PLC) system. It provides eight normally open (N.O.) relay outputs arranged in two groups of four channels, each with a shared common terminal. The module switches AC or DC loads through mechanical relay contacts, allowing PLC logic to control external devices within the specified voltage and current limits.

Hardware Specifications

Relay Output Configuration

The 1746-OW8 uses normally open relay contacts to switch external circuits. When the corresponding PLC output activates, the relay closes its contact and completes the controlled circuit. When the output deactivates, the contact opens.

The eight channels are divided into two groups, with four outputs sharing each common terminal. This arrangement requires attention to the voltage and circuit grouping of connected loads during wiring and panel design.

Electrical Ratings and Switching Characteristics

The module supports a broad range of AC and DC circuit voltages. The listed output current ratings are 1.5 A per output at 120 VAC and 1.2 A per output at 24 VDC. Actual load suitability depends on the load type, switching frequency, and applicable relay contact ratings.

The supplied specifications list a 60 ms ON and 2.5 ms OFF step response, alongside a maximum signal delay of 10 ms in each direction for resistive loads. These figures describe different stated timing characteristics and should not be treated as interchangeable without confirmation from the applicable technical manual.

Integration and Selection Considerations

When selecting the 1746-OW8 as a replacement or spare, verify the SLC 500 system configuration, terminal wiring, output group arrangement, and the electrical requirements of the connected loads. Confirm that both the AC or DC voltage and the load current fall within the applicable ratings.

The listed backplane current is 0.85-0.9 A. Check the installed chassis power budget before adding or replacing the module, and verify the correct value against the hardware documentation for the specific system configuration.

Frequently Asked Questions

Q: How many output channels does the 1746-OW8 provide?

A: It provides eight normally open relay output channels arranged in two groups of four, with a shared common terminal for each group.

Q: Can the 1746-OW8 switch both AC and DC loads?

A: Yes. The stated operating voltage ranges are 5-265 VAC and 5-125 VDC. The applicable current rating and load conditions must also be checked before connecting a device.

Q: What should be checked before replacing an existing 1746-OW8?

A: Verify the SLC 500 configuration, output wiring, group commons, load voltage, load current, and chassis backplane power budget. Also confirm the timing and contact ratings against the relevant hardware documentation.

Other Attributes

• Series: Allen-Bradley ControlLogix
• Country of Origin:  USA
• Lead Time: In Stock, 2 Working Days

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