4-20mA Output Interface New | Allen-Bradley 1771-OFE1

Availability: 20 left in stock

Product Overview The Allen-Bradley 1771-OFE1 acts as the critical bridge between digital PLC-5 logic and analog field instrumentation. This module converts 12-bit...

SKU: 1771-OFE1

Manufacturer: Allen Bradley
Product No.: 1771-OFE1
Product Type: Analog Output Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 650g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen-Bradley 1771-OFE1 acts as the critical bridge between digital PLC-5 logic and analog field instrumentation. This module converts 12-bit digital values from the processor into precise analog voltage (0-10V DC) or current (4-20mA) signals. Engineers utilize the 1771-OFE1 to drive proportional valves, variable frequency drives (VFDs), and analog actuators. By providing two fully isolated channels, the module ensures independent control loops remain stable and free from cross-channel interference in complex automation architectures.

Technical Specifications

We supply this module in 100% Brand New original condition, ensuring 12-bit precision and factory-calibrated accuracy for high-stakes control loops.

Parameter	Specification
Number of Outputs	2 Isolated Channels
Output Voltage Range	0 to 10 Volts DC
Output Current Range	4 to 20 Milliamperes
Resolution	12-Bit (1 part in 4096)
Accuracy	+/- 0.1 percent of full scale
Isolation	Optical Isolation between backplane and outputs
Backplane Current	1.2 Amps at 5 Volts DC
Operating Temperature	0 to 60 degrees C (32 to 140 degrees F)
Storage Temperature	-40 to 85 degrees C (-40 to 185 degrees F)
Status Indicators	Individual Channel LEDs

Engineering Advantages

The 1771-OFE1 solves common signal integrity issues found in distributed industrial environments:

Total Signal Isolation: Optical isolation safeguards the PLC-5 backplane from electrical surges and ground loops originating at the field device. This protection prevents field-side electrical noise from corrupting processor logic or damaging adjacent modules.
High-Resolution Precision: The 12-bit digital-to-analog converter provides 4,096 discrete steps across the output range. This granularity allows for ultra-smooth valve positioning and precise motor speed modulation, reducing mechanical wear on field assets.
Versatile Field Matching: The module supports both voltage and current signals. This flexibility allows engineers to standardize on a single spare part to support different types of field equipment, whether the application requires a 0-10V speed reference or a 4-20mA valve command.
Zero-Downtime Maintenance: The removable wiring arm allows technicians to swap the module in seconds. Because the field wiring stays attached to the arm, you eliminate the risk of wiring errors during replacement and significantly reduce Mean Time to Repair (MTTR).

FAQs

Can I output 0-10V and 4-20mA simultaneously on different channels?

Yes. Each of the two channels operates independently. You can configure one channel for voltage control and the other for current control to suit the specific requirements of your connected field devices.

Does the 1771-OFE1 require an external power supply?

While the module draws its logic power (1.2A) from the 1771 chassis backplane, some analog loop configurations may require an external DC power supply to drive the 4-20mA current loop through high-impedance loads. Always verify the total loop resistance against the module's driving capacity.

How do I verify the status of the analog outputs without a laptop?

The front panel features status LEDs for each channel. These indicators provide immediate visual confirmation of the module's operational state, allowing maintenance personnel to quickly distinguish between a module failure and a field-side wiring break.

Is this module compatible with SLC-500 systems?

The 1771-OFE1 is a 1771-series module designed for PLC-5 chassis. However, you can use it in distributed I/O systems connected to SLC-500 or ControlLogix processors if you utilize a 1771-ASB (Remote I/O) or 1771-ACN (ControlNet) adapter.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.