The Allen-Bradley 1769-OB8 is a compact solid-state digital output module from the 1769 Compact I/O family. For starters, this module provides eight (8) sourcing output channels arranged in two groups of four points each, operating at a nominal 24 Volts DC. Specifically, it is designed for use with CompactLogix controllers, MicroLogix 1500 systems, or in assemblies with EtherNet (1769-AENTR) and DeviceNet (1769-ADN) adapters. Meanwhile, its high-current capability makes it particularly valuable for applications driving solenoids, relays, and other power-hungry field devices. Therefore, this module delivers exceptional output power without sacrificing the compact footprint of the 1769 platform.
To begin with, this module operates within a voltage range of 20.4 to 26.4VDC, with a nominal rating of 24VDC. In addition, the 1769-OB8 draws 145 mA at 5.1 Volts from the backplane. Moreover, the off-state leakage current is minimal, which effectively prevents false triggering of connected loads. Notably, this module features a surge current rating of 4.0 A for 10 ms, repeatable every 2 seconds, making it ideal for applications with high inrush currents. For instance, this surge capability is especially beneficial when driving incandescent lamps or inductive loads.
Furthermore, the 1769-OB8 supports read/writable configuration data that you can program to maintain the last state or user-defined conditions during fault conditions. Additionally, the input data file of this output module does not reflect the electrical state of the output terminals themselves. Instead, it reflects the output data echo of the module, which is an important distinction for troubleshooting and diagnostics. Consequently, users should understand this behavior when monitoring output status through the control system.
First, the 1769-OB8 provides reliable isolation between output groups and the system bus. Besides that, this module features robust protection against overcurrent and short-circuit conditions. For field wiring connections, however, this module requires a separate 1769-RTBN18 replacement terminal block. Likewise, you will need a 1769-RL1 door label and a 1769-RD door for proper identification and physical protection. Therefore, these accessories are available as individual ordering kits, not included with the module itself.
Next, the 1769-OB8 integrates seamlessly with various control architectures. In other words, you can use this module as local I/O with a CompactLogix controller, as expansion I/O with a MicroLogix 1500, or in a distributed I/O system with an EtherNet or DeviceNet adapter. For this reason, the module offers exceptional flexibility for system designers. Before or after mounting, you can assemble the 1769-OB8 with a controller or adjacent I/O modules to work with another system. To ensure proper electrical connections, always lock the bus connectors together firmly after assembly.
Turning to physical dimensions, the 1769-OB8 has a compact single-slot design that fits standard 1769 chassis configurations. Moreover, it has a lightweight design, weighing only 0.56 pounds. In terms of wiring, the module supports stranded copper wire sizes from 22 to 16 AWG, with a recommended terminal torque of 0.68 N-m. Furthermore, you can mount this module on a standard DIN rail or directly onto a panel using the integrated mounting tabs, providing flexible installation options for various control cabinet layouts.
When installing the 1769-OB8, the process is relatively straightforward. First, ensure the system power is disconnected before any installation work begins. Next, mount the module on a standard DIN rail or directly onto a panel using the integrated mounting tabs. After that, secure the module by engaging the DIN rail latches or mounting screws firmly into place. Following this, connect the field wiring to the 1769-RTBN18 removable terminal block, observing correct polarity for sourcing outputs. Finally, reapply power and configure the module within your programming software. For optimal performance, always verify that the bus connectors are properly locked after assembly to ensure reliable backplane communication.
1 x Allen-Bradley 1769-OB8 output module
1 x 1769-RL1 door label
1 x 1769-RD door
Installation instructions leaflet
Note: The 1769-RTBN18 removable terminal block is not included and must be ordered separately.
All orders are shipped via FedEx, UPS, or DHL with reliable tracking services. Please contact our sales team for shipping lead times and freight charges.
Q1: Is the 1769-OB8 compatible with MicroLogix 1500 controllers?
A1: Yes, the 1769-OB8 works seamlessly with both CompactLogix controllers and MicroLogix 1500 systems as a local or expansion I/O module.
Q2: What is the surge current rating for this module?
A2: The 1769-OB8 delivers a surge current of 4.0 A for 10 ms, repeatable every 2 seconds, making it suitable for high-inrush loads.
Q3: Does the input data file reflect the actual output terminal state?
A3: No, the input data file reflects the output data echo of the module, not the actual electrical state of the output terminals.
Q4: Does this module come with the removable terminal block?
A4: No, the 1769-RTBN18 terminal block is sold separately. You will need to order it as an individual kit.
Q5: What configuration options does this module support?
A5: The 1769-OB8 supports read/writable configuration data that you can program to maintain the last state or user-defined conditions during fault conditions.
| Brand Name | |
| Model No. | 1769-OB8 |
| Product Type | Output Module |
| hasMerchantReturnPolicy | Adjust according to reality |
| Shippingdetails | Adjust according to reality |
