This page describes the Allen-Bradley 1769-OB8 DC digital output module. It provides 8 sourcing outputs at 24 Volts DC. The module is a high-current type for demanding industrial applications.

Allen-Bradley 1769-OB8 Output Module Overview

The Allen-Bradley 1769-OB8 is a DC-powered digital output module. Specifically, it belongs to the CompactLogix series from Rockwell Automation. Therefore, this module provides 8 sourcing outputs at 24 Volts DC. Consequently, users select the 1769-OB8 for high-current switching applications. Moreover, the module is a solid-state design for long service life. Finally, it mounts on a DIN rail or directly on a panel.

Technical Specifications of 1769-OB8

The Allen-Bradley 1769-OB8 has 8 digital output channels. Specifically, these outputs divide into 2 groups with 4 points each. The operating voltage range is 20.4 to 26.4V DC. Nominal voltage is 24 Volts DC sourcing type. Current draw is 145 mA at 5.1 Volts. Surge current reaches 4 Amps for 10 milliseconds. This surge is repeatable every 2 seconds.

The module uses an 8-point communication cable for wiring. Replacement terminal block is 1769-RTBN18. Replacement door is 1769-RD for easy field service. Wire size for stranded cable ranges from 22 to 16 AWG. The module includes read/writable configuration data. Users can program the last state or user-defined conditions.

The 1769-OB8 has a voltage range of 20.4 to 26.4V DC. The input data file reflects output data echo only. It does not reflect the electrical state of output terminals. Therefore, the module cannot detect shorted or open outputs. This is normal for this type of output module. Series A and B are both available.

Shipping weight is 2 lbs for the packaged module. Shipping dimensions are 8 x 8 x 5 inches. The module can be assembled with a controller or adjacent I/O module. Lock the bus connectors together for proper electrical connection. The module is a high-current type for demanding loads. Use it for solenoids, relays, and indicator lights.

Installation Guidelines for Allen-Bradley 1769-OB8

First, mount the 1769-OB8 on a DIN rail or panel. Then, align the module with adjacent CompactLogix units. After that, push the modules together until they seat fully. Next, lock the bus connectors to ensure electrical contact. Subsequently, connect field wiring to the output terminals. Finally, apply 24V DC power to the module.

First, shut off all power before wiring the module. Then, strip 7 mm of insulation from each stranded wire. After that, insert each wire into the correct terminal. Use 22 to 16 AWG stranded copper wire only. For sourcing outputs, connect the load between output and common. Do not exceed 4 Amps surge current per output. Finally, close the module door after wiring is complete.

Package Contents of 1769-OB8

Your shipment includes these items:

One Allen-Bradley 1769-OB8 DC output module

One door label for output identification

One product installation instructions manual

However, the package does not include the 1769-RTBN18 terminal block. Therefore, order this replacement block separately if needed. Also, no mounting hardware is provided with this module. Finally, the replacement door (1769-RD) is sold separately.

Frequently Asked Questions about 1769-OB8

1. What controllers work with the 1769-OB8 module?

The Allen-Bradley 1769-OB8 works with CompactLogix controllers. Specifically, it also works with MicroLogix systems as expansion I/O. Therefore, check your controller compatibility before ordering. The module also works with EtherNet/IP or DeviceNet adapters.

2. What is the surge current rating on the 1769-OB8?

The 1769-OB8 has a surge current rating of 4 Amps. Specifically, this surge lasts for 10 milliseconds. Therefore, the module handles high inrush loads like solenoids. The surge is repeatable every 2 seconds for demanding applications.

3. Can the 1769-OB8 detect shorted outputs?

No, the Allen-Bradley 1769-OB8 cannot detect shorted outputs. Specifically, the input data file reflects output data echo only. Therefore, the module does not monitor the actual output state. Use external fusing for output short circuit protection.

4. What is the current draw of the 1769-OB8?

The 1769-OB8 draws 145 mA at 5.1 Volts from the backplane. Specifically, this is the current consumption for internal logic. Therefore, calculate your power supply budget accordingly. The output load current comes from the external 24V DC supply.

5. What replacement parts are available for the 1769-OB8?

The Allen-Bradley 1769-OB8 has two replacement parts. Specifically, the terminal block is 1769-RTBN18. The replacement door is 1769-RD. Therefore, order these separately if damaged in the field. Both parts are available from Rockwell Automation distributors.

Compatibility and Application Notes

The Allen-Bradley 1769-OB8 is a current product from Rockwell Automation. Specifically, it belongs to the 1769 Compact I/O family. Use this module for solenoids, contactors, and indicator lights. The high-current design handles 4A surge currents reliably. UPC number is 10611320915683. Series A and B are both available. HS code for customs is 85389000. Finally, store the module in a static-free environment before installation. Allen-Bradley and Rockwell Automation manufacture this product in the USA.