Allen Bradley PLC-5

Overview

Brand Name:	Allen Bradley
Model Number:	1771-OBD
Country of Origin:	USA
Packaging Details:	Original new Factory Sealed
Delivery Time:	Delivery time in stock
Payment Terms:	T/T

Contact for quotation

Sales Manager:	Stella
Send an email:	[email protected]
Contact in Whatsapp:	+86 18159889985

Specifications

Parameter	Specification
Catalog Number	1771-OBD
Series	C
Outputs per Module	16 (sourcing outputs)
Module Location	1771 I/O chassis (Series B or later required)
Output Voltage Range	10 to 60V dc
Output Current (Continuous)	2.0A per output (max.)
Output Current (Module Total)	Information not specified in the source material
On-state Voltage Drop (max.)	Information not specified in the source material
Off-state Leakage Current (max.)	Information not specified in the source material
Output Signal Delay	Information not specified in the source material
Fuse Type	Information not specified in the source material
Backplane Current	Information not specified in the source material
Isolation Voltage	1500V ac rms (typical for 1771 I/O modules)
Agency Certification	CSA certified, CSA Class I Division 2 Groups A-D, UL listed, CE marked for applicable directives
Installation Instructions	Publication 1771-2.76

Description

The 1771-OBD is a 16-point DC output module from Allen-Bradley's 1771 Universal I/O structure, engineered to interface with ON/OFF devices such as motor starters, solenoids, and indicators . As a series C module, the 1771-OBD operates within a 10–60V dc range and is compatible with all current Allen-Bradley programmable controllers . Designed for high-power industrial applications, the 1771-OBD provides sourcing outputs, making it suitable for driving a wide variety of field devices. The module also features a green module active indicator, 16 red status indicators, and a red fuse-blown indicator for rapid troubleshooting .

Competitive Advantage

High Density in a Single Slot – With 16 outputs per module, the 1771-OBD maximizes I/O capacity within the 1771 chassis, reducing the number of slots required for large-scale control systems.
Wide Voltage Operating Range – The 10–60V dc capability allows the module to interface with a broad spectrum of industrial loads without requiring multiple module types.
Opto-Electrical Isolation – Provides 1500V ac rms isolation between field wiring and the backplane, enhancing system noise immunity and protecting the controller from field transients.
Comprehensive Diagnostic Feedback – Individual output status LEDs and a dedicated fuse-blown indicator enable rapid fault identification, reducing downtime and simplifying maintenance.
Agency Certified for Hazardous Locations – CSA Class I Division 2 Groups A-D certification allows installation in potentially explosive environments, expanding deployment flexibility.
Fault Mode Configuration – The last state or reset configuration plug allows the module to respond predictably to internal faults, ensuring controlled system behavior during abnormal conditions.

Features

16 Sourcing DC Outputs – Drives a wide range of DC loads including motor starters, solenoids, and indicator lamps
Wide Operating Voltage Range – 10 to 60V dc compatibility for versatile field device integration
Output Status Indicators – 16 red LEDs provide real-time field-side indication of each output's ON/OFF state
Module Active Indicator – Green LED confirms the module is powered and operating correctly
Fuse-Blown Indicator – Red LED illuminates when an output fuse has opened, simplifying troubleshooting
Opto-Electrical Isolation – 1500V ac rms isolation between field wiring and backplane for noise immunity and protection
Fault Mode Selection – Configurable jumper for last state or reset behavior upon internal fault detection
Keying Compatibility – Works with 1/2-slot, 1-slot, and 2-slot addressing modes (requires conditional placement with R rating)
Agency Approvals – CSA certified, CSA Class I Division 2 Groups A-D, UL listed, and CE marked for all applicable directives
Comprehensive Documentation – Supported by Installation Instruction publication 1771-2.76

Theory of Operation

The 1771-OBD operates as a digital output module within the Allen-Bradley 1771 Universal I/O architecture. It receives control signals from the programmable controller via the I/O chassis backplane. When a specific output bit in the processor's output image table is set to "1", the corresponding output channel on the 1771-OBD turns on, applying the field-supplied DC voltage (10–60V) to the connected load. Each output channel is optically isolated from the backplane and logic circuits, providing 1500V ac rms of isolation to protect the controller from electrical noise and transients generated by inductive loads such as solenoids and motor starters. Outputs are fused to protect against overcurrent conditions; a blown fuse is indicated by a dedicated red LED on the module's front panel. Upon detection of an internal fault, the module can be configured via a jumper to either hold its outputs in their last state or reset them to the off state, providing predictable system behavior during fault conditions.

FAQ

Q1: What is the voltage range for the 1771-OBD output module?

A1: The 1771-OBD operates with a DC output voltage range of 10 to 60V dc, making it suitable for a wide variety of industrial loads .

Q2: How many outputs does the 1771-OBD provide?

A2: The 1771-OBD is a 16-point output module, providing 16 sourcing DC outputs in a single 1771 I/O chassis slot.

Q3: What do the status indicators on the 1771-OBD represent?

A3: The module features 16 red status indicators (one per output) for real-time ON/OFF status, a green module active indicator, and a red fuse-blown indicator to alert when an output fuse has opened .

Q4: Is the 1771-OBD compatible with all Allen-Bradley controllers?

A4: Yes, the 1771-OBD is compatible with all current Allen-Bradley programmable controllers and fits within the 1771 Universal I/O structure . However, it requires a Series B or later 1771 I/O chassis .

Q5: What addressing modes can be used with the 1771-OBD?

A5: The 1771-OBD supports 1/2-slot, 1-slot, and 2-slot addressing modes . For 2-slot addressing, the module must be placed in a specific configuration (R rating), requiring an input module and an output module in two adjacent slots (even/odd) beginning with slot 0 .

Inquiry Now :[email protected]