PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-OFE2 is an analog output module for the PLC-5 system. It features four individually isolated differential analog output channels delivering 4 to 20 mA. The module mounts into a single slot of any 1771 I/O chassis. It operates in both local chassis and remote I/O configurations. The hardware drives final control elements such as valves, actuators, dampers, and louvers.
Internal circuitry operates from the 1771 backplane without requiring an external power supply. Individual channel isolation provides 1000 Volts differential protection across circuits. Optoelectrical isolation of 1500 Volts protects system backplane circuitry from overvoltage events. Field wiring terminates at a detachable 1771-WC or 1771-WH wiring arm. This arm allows module replacement without disconnecting field leads. Diagnostic indicators include a green power status LED and a red fault LED.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
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| Backplane Current | 1.5 Miliamperes |
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| Backplane power | 1.50 A |
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| Category | PLCs |
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| Coating | Conformal Coat |
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| Current Range | 4-20 Miliamperes |
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| Data Format | Natural Binary or BDC Scaling to +/- 9999 |
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| Digital resolution | 12-bit binary |
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| External Power | None |
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| Field Wiring Arm | Cat. No. 1771-WC |
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| Indicators | 2 LED |
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| Keying | Between 10 and 12; Between 26 and 28 |
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| Module Type | Individually isolated analog output module |
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| Module location | 1771 I/O chassis |
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| Module width | Single slot |
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| Mounting | Rack Mountable |
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| No. of outputs | Four (4) outputs |
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| Number of I/O | 4 Isolated (1000 Volt) Differential |
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| Output Current | 4-20 mA |
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| Power Dissipation | 7.9 Watts |
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| Product Line | PLC 5 |
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| Thermal Dissipation | 26.9 BTU/hr |
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| Typical AC Signal Delay (Off) | 45 (+/- 15) ms |
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| Typical DC Signal Delay (Off) | 50 ms |
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| UPC | 612598003075 |
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| Weight | 1.88 lbs (0.85 kg) |
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| Wiring Arm | 1771-WH |
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| Wiring Arm Screw Torque | 7-9 inch-pounds |
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TECHNICAL INFORMATION
Features
- Four individually isolated differential current output channels rated at 4-20 mA.
- Direct backplane power operation eliminating external module supply requirements.
- Optical isolation rated at 1500 Volts protects system backplane circuits.
- Digital-to-analog converter settling time reaches a maximum of 0.8 ms.
- Selectable data presentation in natural binary or BCD scaling up to +/- 9999.
- Two front-panel LEDs provide operational status and fault diagnostics.
- Single-slot form factor mounts in any standard 1771 I/O chassis.
TECHNICAL INFORMATION
Applications
- Final control element positioning including valves, actuators, dampers, and louvers.
- Analog speed setpoint control for industrial variable frequency drives.
- Output loop execution from PLC-5 proportional-integral-derivative control instructions.
- Current loop transmission to signal isolators, data loggers, and analog panel meters.
TECHNICAL INFORMATION
Connections / Interfaces
- Field connections terminate on a detachable 1771-WC or 1771-WH wiring arm.
- Screw terminals support 12 AWG stranded or solid field wire.
- Differential terminal pairs route signals to each isolated current loop.
- Chassis keying positions set between pins 10-12 and pins 26-28.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into any available slot of an unpowered 1771 chassis.
- Snap backplane keying bands between pin positions 10-12 and 26-28.
- Ensure adjacent slot power dissipation does not exceed 10 Watts.
- Use shielded twisted-pair cabling such as Belden 8761 for field wiring.
- Tighten field wiring arm terminal screws to 7-9 in-lb of torque.
TECHNICAL INFORMATION
Configuration Guidelines
- Configure data format as Natural Binary or BCD scaling in PLC-5 software.
- Data can scale to engineering units like degrees Celsius, gallons/minute, or psi.
- Channel update time is 1.6 ms for Natural Binary across 4 channels.
- Channel update time is 8 ms for BCD across 4 channels.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley PLC-5 control systems.
- Allen-Bradley 1771 I/O chassis in local or remote racks.
- Allen-Bradley 1771-WC and 1771-WH field wiring arms.
TECHNICAL INFORMATION
Lifecycle / Replacement Information
- The detachable field wiring arm permits module replacement without disconnecting field leads.
- Verify backplane keying band placement between pins 10-12 and 26-28 before insertion.
- Verify power dissipation limits of adjacent modules during replacement planning.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley PLC-5 control systems. Allen-Bradley 1771 I/O chassis in local or remote racks. Allen-Bradley 1771-WC and 1771-WH field wiring arms.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
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
Does the 1771-OFE2 module require an external power supply?
No external power supply is needed. Operating power is supplied directly from the 1771 chassis backplane.
What wiring arms work with the 1771-OFE2 module?
The module uses the 1771-WC or 1771-WH field wiring arm. It enables module removal without disconnecting field wires.
What is the market reference price for the 1771-OFE2?
Observed market reference pricing is approximately $109.00 USD for refurbished units. This figure is indicative market reference pricing only and is not a final quotation.
