Allen-Bradley 1769-OB8 CompactLogix Digital Output Module
The Allen-Bradley 1769-OB8, also cataloged as the 1769-OB8 Digital Output Module, operates as a dedicated hardware component for 24 VDC sourcing discrete actuator control within Allen-Bradley CompactLogix platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OB8 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.20 kg (0.44 lbs) |
| Dimensions | Standard 1769 Compact I/O single-slot width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 145 mA at 5.1 VDC (backplane load) |
| Output Type | Solid-state 24 VDC sourcing |
| Output Points | 8 channels (1 group of 8) |
| Operating Voltage Range | 20.4 to 26.4 VDC |
| Output Current | 1.0 A per channel max (high current) |
| Isolation Voltage | 75 VDC continuous channel-to-bus |
Backplane Bus Communication and Deterministic Networks
The Allen-Bradley 1769-OB8 module relies on high-speed backplane bus communication velocity to execute real-time discrete switching orders directly from CompactLogix processors. Operating within EtherNet/IP deterministic networks, the solid-state output circuitry delivers high-current switching capacity with fast response times. Full I/O density scaling and firmware flash compatibility allow real-time control of field solenoids, indicators, and relay coils while maintaining optical signal isolation between field load circuits and internal backplane logic structures.
Frequently Asked Questions
Q: What is the maximum current rating per channel supported by the 1769-OB8 output module?
A: Each individual solid-state output channel supports high-current switching up to 1.0 A at 24 VDC continuous load, subject to total module thermal limits.
Q: What is the power supply distance rating for the 1769-OB8 module on a CompactLogix rack?
A: The module features an 8-module power supply distance rating, permitting installation up to 8 slots away from the 1769 system power supply.
Field Installation Guidelines
- Isolate main power sources feeding the CompactLogix backplane and field output circuits before installing the module.
- Confirm that the 1769-OB8 module is positioned within 8 slots of its host power supply module on the local bank.
- Wire external 24 VDC field power and output load lines to the removable terminal block using proper gauge copper conductors.
- Install reverse-biased flyback diodes or surge suppressors across inductive field loads to protect solid-state outputs from voltage spikes.
- Snap adjacent DIN rail retaining clips firmly into position to maintain continuous chassis earth grounding and bus connectivity.
Allen-Bradley 1769-OB8 CompactLogix Digital Output Module
Allen-Bradley 1769-OB8 CompactLogix Digital Output Module
The Allen-Bradley 1769-OB8, also cataloged as the 1769-OB8 Digital Output Module, operates as a dedicated hardware component for 24 VDC sourcing discrete actuator control within Allen-Bradley CompactLogix platforms.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 1769-OB8 |
| Brand | Allen-Bradley |
| Origin | USA |
| Weight | 0.20 kg (0.44 lbs) |
| Dimensions | Standard 1769 Compact I/O single-slot width |
| Operating Temp | 0 to 60 deg C |
| Power Consumption | 145 mA at 5.1 VDC (backplane load) |
| Output Type | Solid-state 24 VDC sourcing |
| Output Points | 8 channels (1 group of 8) |
| Operating Voltage Range | 20.4 to 26.4 VDC |
| Output Current | 1.0 A per channel max (high current) |
| Isolation Voltage | 75 VDC continuous channel-to-bus |
Backplane Bus Communication and Deterministic Networks
The Allen-Bradley 1769-OB8 module relies on high-speed backplane bus communication velocity to execute real-time discrete switching orders directly from CompactLogix processors. Operating within EtherNet/IP deterministic networks, the solid-state output circuitry delivers high-current switching capacity with fast response times. Full I/O density scaling and firmware flash compatibility allow real-time control of field solenoids, indicators, and relay coils while maintaining optical signal isolation between field load circuits and internal backplane logic structures.
Frequently Asked Questions
Q: What is the maximum current rating per channel supported by the 1769-OB8 output module?
A: Each individual solid-state output channel supports high-current switching up to 1.0 A at 24 VDC continuous load, subject to total module thermal limits.
Q: What is the power supply distance rating for the 1769-OB8 module on a CompactLogix rack?
A: The module features an 8-module power supply distance rating, permitting installation up to 8 slots away from the 1769 system power supply.
Field Installation Guidelines
- Isolate main power sources feeding the CompactLogix backplane and field output circuits before installing the module.
- Confirm that the 1769-OB8 module is positioned within 8 slots of its host power supply module on the local bank.
- Wire external 24 VDC field power and output load lines to the removable terminal block using proper gauge copper conductors.
- Install reverse-biased flyback diodes or surge suppressors across inductive field loads to protect solid-state outputs from voltage spikes.
- Snap adjacent DIN rail retaining clips firmly into position to maintain continuous chassis earth grounding and bus connectivity.
