Output Modules | Allen-Bradley 1771-OBN
The Allen-Bradley 1771-OBN is a high-density 32-channel digital DC output module designed for the PLC-5 platform architecture. It provides reliable high-true sourcing outputs operating within a 10 to 30 VDC range, tailored for controlling various industrial actuators and indicator devices in legacy control systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OBN |
| Brand | Allen-Bradley |
| Product Family | PLC-5 |
| Product Type | Output Module |
| Number of Outputs | 32 (4 groups of 8 channels) |
| Operating Voltage | 10 to 30 VDC |
| Current Per Output | 0.5 A |
| Backplane Current | 330 mA |
| Output Type | Sourcing (High-True) |
| Mounting Style | Rack Mount |
| Weight | 0.91 kg |
| Operational Temperature | 0 to 60 deg C |
Architectural Layout and Channel Configuration
The module organizes its 32 digital outputs into four isolated groups of eight channels each. Each group can interface with separate external power supplies to accommodate multi-voltage or segmented loop architectures within the same chassis. Front-panel LED indicators display individual channel status and fuse health for immediate diagnostics.
Electrical Ratings and Backplane Requirements
Each individual channel delivers up to 0.5 A of continuous output current, bounded by an 8 A total module limit. The internal logic circuitry draws a maximum backplane current of 330 mA from the 5 VDC chassis power supply. Built-in protection handles surge currents up to 2 A per output for 10 milliseconds to safeguard downstream components.
Installation and Environmental Specifications
Engineered for standard rack mounting, the unit installs directly into compatible 1771 I/O chassis backplanes. It features physical mechanical keying between slots 14-16 and 20-22 to prevent incorrect module insertion. The module operates effectively in industrial environments ranging from 0 to 60 deg C with relative humidity up to 95 percent non-condensing.
Frequently Asked Questions
Q: What type of input devices do these sourcing outputs require?A: The 1771-OBN module utilizes sourcing outputs and requires sinking input field devices that provide a direct path to ground.
Q: How are individual channel groups protected against overloads?A: Each of the four output groups is protected by a dedicated 4.0 A, 250 V normal-blow fuse located on the module.
Q: Is this module compatible with all 1771 I/O chassis types? A: No, it is compatible with 1771-A1B through -A4B or later chassis variants, but it cannot be used in legacy 1771-A1, -A2, and -A4 chassis.
Output Modules | Allen-Bradley 1771-OBN
Output Modules | Allen-Bradley 1771-OBN
The Allen-Bradley 1771-OBN is a high-density 32-channel digital DC output module designed for the PLC-5 platform architecture. It provides reliable high-true sourcing outputs operating within a 10 to 30 VDC range, tailored for controlling various industrial actuators and indicator devices in legacy control systems.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 1771-OBN |
| Brand | Allen-Bradley |
| Product Family | PLC-5 |
| Product Type | Output Module |
| Number of Outputs | 32 (4 groups of 8 channels) |
| Operating Voltage | 10 to 30 VDC |
| Current Per Output | 0.5 A |
| Backplane Current | 330 mA |
| Output Type | Sourcing (High-True) |
| Mounting Style | Rack Mount |
| Weight | 0.91 kg |
| Operational Temperature | 0 to 60 deg C |
Architectural Layout and Channel Configuration
The module organizes its 32 digital outputs into four isolated groups of eight channels each. Each group can interface with separate external power supplies to accommodate multi-voltage or segmented loop architectures within the same chassis. Front-panel LED indicators display individual channel status and fuse health for immediate diagnostics.
Electrical Ratings and Backplane Requirements
Each individual channel delivers up to 0.5 A of continuous output current, bounded by an 8 A total module limit. The internal logic circuitry draws a maximum backplane current of 330 mA from the 5 VDC chassis power supply. Built-in protection handles surge currents up to 2 A per output for 10 milliseconds to safeguard downstream components.
Installation and Environmental Specifications
Engineered for standard rack mounting, the unit installs directly into compatible 1771 I/O chassis backplanes. It features physical mechanical keying between slots 14-16 and 20-22 to prevent incorrect module insertion. The module operates effectively in industrial environments ranging from 0 to 60 deg C with relative humidity up to 95 percent non-condensing.
Frequently Asked Questions
Q: What type of input devices do these sourcing outputs require?A: The 1771-OBN module utilizes sourcing outputs and requires sinking input field devices that provide a direct path to ground.
Q: How are individual channel groups protected against overloads?A: Each of the four output groups is protected by a dedicated 4.0 A, 250 V normal-blow fuse located on the module.
Q: Is this module compatible with all 1771 I/O chassis types? A: No, it is compatible with 1771-A1B through -A4B or later chassis variants, but it cannot be used in legacy 1771-A1, -A2, and -A4 chassis.
