Allen-Bradley 1771-OBD PLC-5 Digital Output Module
$123.00
$320.00
Description
Overview
The 1771-OBD is a PLC-5 series discrete output module developed by Allen-Bradley for industrial control applications requiring multi-channel DC switching capability. It provides 16 sourcing output points designed for driving field loads such as relays, solenoids, and indicator devices within PLC-based automation systems.
This module is designed for installation in Allen-Bradley 1771 I/O chassis systems and is compatible with multiple rack configurations, excluding specific chassis types as defined by system architecture requirements. It is widely used in legacy PLC-5 installations where robust and high-current DC output control is required.
Technical Specifications
| ParameterSpecification | |
| Manufacturer | Allen-Bradley / Rockwell Automation |
| Model | 1771-OBD |
| Product Family | PLC-5 |
| Product Type | 16-Point DC Digital Output Module |
| Output Type | Sourcing discrete outputs |
| Number of Outputs | 16 channels |
| Voltage Range | 10–60 VDC |
| Nominal Voltage | 48 VDC |
| Max Continuous Current per Output | 2 A (resistive load) |
| Max Current per Module | 8 A total |
| Pilot Duty Rating | 0.2 A per output |
| Backplane Current | 400 mA @ 5 VDC |
| Power Dissipation | 15.6 W |
| Thermal Dissipation | 53.3 BTU/hr |
| Surge Current | Up to 4 A (10 ms, repeatable every 2 s) |
| Minimum Load Current | 2.5 mA |
| Signal Delay (DC Off) | ~50 ms |
| Mounting Type | 1771 I/O Rack Mount |
| Compatible Chassis | 1771-A1B to 1771-A4B (excluding 1771-A4) |
| Wiring Arms | 1771-WH / WHF / WHFB |
| Wiring Torque | 7–9 in-lbs |
| Data Format | BCD or Binary |
| Coating | Conformal coated |
| Weight | 1.85 lbs |
Functional Overview
The 1771-OBD module provides high-density discrete output control for PLC-5 systems, enabling centralized switching of DC loads across industrial machinery. Each channel operates independently, allowing flexible control of multiple actuators within a single rack-mounted module.
Its rugged design supports stable operation in industrial environments where electrical noise, load variation, and continuous duty cycles are common.
System Integration
This module is designed for use within Allen-Bradley 1771 I/O architectures and integrates directly with PLC-5 processors. It supports standard field wiring arms for simplified installation and maintenance.
Typical connected loads include:
- Solenoid valves
- Motor contactors
- Indicator lamps
- Relay coils
- Industrial actuators
Key Features
- 16-channel DC sourcing output configuration
- Wide voltage support from 10 to 60 VDC
- High per-channel current handling capability
- Rack-mounted PLC-5 compatibility
- Field-serviceable wiring arm interface
- Conformal-coated protection for industrial environments
- Stable switching performance for discrete control applications
Application Areas
- Manufacturing automation systems
- Machine control panels
- Material handling equipment
- Process control systems
- Legacy PLC-5 system maintenance
- Industrial retrofit projects
FAQ
Is the 1771-OBD still supported by Allen-Bradley?
It is considered a legacy module and is primarily supported through existing installed base maintenance and spare parts channels.
Can it drive inductive loads directly?
Yes, but inductive loads such as solenoids or relays should be evaluated within surge and pilot duty limits.
Which PLC systems use this module?
It is designed for PLC-5 systems using the Allen-Bradley 1771 I/O chassis platform.
Does it require a specific wiring arm?
Yes. Compatible wiring arms include 1771-WH, 1771-WHF, and 1771-WHFB depending on installation requirements.
Features
Minimum Order Quantity (MOQ)
We welcome bulk orders and have a minimum order quantity of just one unit.
Certificates and Documentation
Upon request, we can provide all necessary documentation, including Certificates of Origin/Conformance and other required export documents.
Delivery Time
For items in stock, we aim to deliver within 1-3 days after payment confirmation. Items with specified lead times will be delivered according to the quoted schedule.
Payment Methods
We accept 100% T/T (Telegraphic Transfer) payment before shipping. For items with lead times, a 30% deposit is required upfront, with the remaining 70% due before shipment. For RMB transfers, please contact us if you have an agent in China.
Warranty
We offer a standard one-year warranty on all new and original items. If you require an extended warranty, please contact us for additional cost details.
Refund and Return Policy
Your satisfaction is important to us. If you need to return an item, it must be done within 30 days of the order date. The product must be unused, unopened, and in its original packaging with all accessories included. Refunds are processed within 5-7 business days after we receive the returned item. Please note that shipping and related charges are non-refundable.
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