PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-OB is an 8-channel digital DC output driver module for PLC-5 systems. This module provides current-sourcing solid-state DC outputs across eight field circuits. It operates over a DC voltage range between 10 and 27 Volts DC. The unit mounts directly into a standard 1771 I/O rack slot. It draws 165 milliamperes of current from the backplane power supply.
Each output channel handles a maximum continuous current of 1.5 amperes. Total module continuous load current reaches up to 8 amperes across all channels. The maximum power dissipation rating of this digital output module is 16.9 Watts. Thermal dissipation rating is 57.6 BTU per hour. Conformal coating protects the internal circuitry during operation. Field connections are established using 1771-WH or 1771-WA wiring arms.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Number of Outputs | 8 Outputs |
|---|
| Voltage Category | 10-60 Volts DC, Source |
|---|
| DC Operating Voltage | 10-27 Volts DC |
|---|
| Backplane Current | 165 mA |
|---|
| Max Continuous Current Per Output | 1.5 A |
|---|
| Max Continuous Current Per Module | 8 A |
|---|
| Power Dissipation | 16.9 W |
|---|
| Thermal Dissipation | 57.6 BTU/hr |
|---|
| Wiring Arm Compatibility | 1771-WH, 1771-WA |
|---|
| Circuit Coating | Conformal Coat |
|---|
| Data Format | BCD or Natural Binary |
|---|
| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
|---|
| Typical DC Signal Delay (Off) | 50 ms |
|---|
| Mounting | Rack Mountable |
|---|
TECHNICAL INFORMATION
Features
- Provides eight discrete current-sourcing DC output channels.
- Operates across a voltage range from 10 to 27 Volts DC.
- Delivers up to 1.5 amperes continuous current per output.
- Supports a maximum continuous current of 8 amperes per module.
- Draws 165 milliamperes of backplane current.
- Features conformal coating on internal electronic circuitry.
TECHNICAL INFORMATION
Connections / Interfaces
- Mounts directly into any compatible Allen-Bradley 1771 I/O rack slot.
- Interfaces with field wiring through a 1771-WH or 1771-WA wiring arm.
- Receives backplane control data formatted as BCD or natural binary.
TECHNICAL INFORMATION
Installation Guidelines
- Mount the module securely into an unpowered 1771 series I/O chassis slot.
- Attach a 1771-WH or 1771-WA wiring arm to establish field terminations.
- Verify that the total continuous module current does not exceed 8 amperes.
- Maintain field supply voltage within the specified 10 to 27 Volts DC range.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The 1771-OB belongs to the Allen-Bradley PLC-5 product line.
- Observed catalog variations and revisions include 1771-OB/A, 1771-OB/B, and 1771-OB/C.
TECHNICAL RESOURCES
Documentation
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What is the operating voltage range for the Allen-Bradley 1771-OB?
The 1771-OB operates on a DC voltage range of 10 to 27 Volts DC.
What are the output current limits for the 1771-OB module?
The module supports up to 1.5 amperes per channel and 8 amperes total per module.
Which wiring arm is compatible with the 1771-OB output module?
The module uses the 1771-WH or 1771-WA wiring arm for field wiring connections.
What is the reference market price for the 1771-OB?
Observed market reference pricing is approximately $89.00 USD for refurbished units. This figure is an indicative market reference only and is not a final quotation.
